Sensor mounting arrangement

• US 4,633,966 A
• Filed: 09/12/1985
• Issued: 01/06/1987
• Est. Priority Date: 09/12/1985
• Status: Expired due to Fees

• Current Assignee: FMC Corporation
• Original Assignee: Caterpillar Incorporated
• Inventors: Fotheringham, James R.
• Primary Examiner(s): Love, John J.
• Assistant Examiner(s): Watts, Charles R.
• Application Number:
  US06/775,193
• Time in Patent Office: 481 Days
• Field of Search: 180/79, 180/79.1, 180/167, 180/168, 180/169, 180/252, 180/253, 180/264, 180/197, 73/493, 73/494, 73/509, 324/160, 324/166, 324/171, 340/870.37, 188/181 R, 188/181 A, 303/95, 303/100
• US Class Current: 180/253
• CPC Class Codes: B62D 1/28 non-mechanical , e.g. following a line or other known markers
• CPC Class Codes: B62D 15/02 Steering position indicators ; Steering position determination; Steering aids
• CPC Class Codes: B62D 7/02 for pivoted bogies

Abstract

Sensors of the type capable of delivering a signal representative of the rotated position of an output member frequently fail prematurely because of excessive side and axial loading and electrical conductor damage. A mounting arrangement for a first sensor has an apparatus for connecting an input shaft of the first sensor to an output member, and apparatus for connecting a body of the first sensor to a housing and maintaining the body against rotation about an input shaft axis and thereby reducing the force applied to the sensor body caused by wobble of the first sensor. The mounting arrangement has a connecting shaft and guide assembly, which guides and protects an electrical conductor both internally and externally of the housing, and the first apparatus permits the passing of the electrical conductor thereby. Therefore, premature failure of and damage to the electrical conductor and the first sensor is substantially reduced. The sensor mounting arrangement is particularly suited for use on a steering axle assembly of a work vehicle.

Claims

1. A mounting arrangement, comprising:

a housing;

an output member having an axis and being connected to said housing and rotatable in said housing about said axis;

a first sensor having a body and an input shaft rotatably connected to said body, said input shaft having an axis and being rotatable about said axis;

means for connecting the input shaft to said output member at a location at which the input shaft is axially spaced from said output member, and substantially axially aligning the axis of said input shaft with the axis of said output member, said input shaft being rotatable in response to rotation of said output member; and

means for connecting the body of said first sensor to said housing and maintaining said first sensor body from rotation about the axis of the input shaft and for movement in at least one of an axial and radial direction relative to the input shaft axis, said means for connecting the first sensor body to said housing being movable, in response to said input shaft applying a force to said first sensor body in at least one of said anxial and radial directions relative to said input shaft axis, to permit said movement of the first sensor body and reduce the force applied to said first sensor body.

2. The mounting arrangement, as set forth in claim 1, wherein said means for connecting the input shaft to the output member includes:

a connecting shaft having a first end portion and being connected to said output member, said connecting shaft extending from said output member, along the output member axis, to a location at which said connecting shaft first end portion is spaced from said output member;

a clamp having first and second spaced apart end portions and being connected at said clamp first end portion to the connecting shaft first end portion and at said clamp second end portion to said input shaft; and

means for fastening the first and second clamp end portions to said connecting and input shafts, respectively.

3. A mounting arrangement, comprising:

a housing;

an output member having an axis and being connected to said housing and rotatable in said housing about said axis;

a first sensor having a body and an input shaft rotatably connected to said body, said input shaft having an axis and being rotatable about said axis;

means for connecting the input shaft to said output member at a location spaced from said output member, and substantially axially aligning the axis of said input shaft with the axis of said output member, said input shaft being rotatable in response to rotation of said output member;

means for connecting the body of said first sensor to said housing and maintaining said body from rotation about the axis of the input shaft, said means for connecting the first sensor body to said housing being movable, in response to said input shaft applying a force to said first sensor body, in at least one of an axial and a radial direction relative to said input shaft axis, to reduce the force applied to said first sensor body, said means for connecting the input shaft to the output member includes;

a connecting shaft having a first end portion and being connected to said output member, said connecting shaft extending from said output member, along the output member axis, to a location at which said connecting shaft first end portion is spaced from said output member;

a clamp having first and second spaced apart end portions and being connected at said clamp first end portion to the connecting shaft first end portion and at said clamp second end portion to said input shaft; and

means for fastening the first and second clamp end portions to said connecting and input shafts, respectively, said connecting shaft having an aperture opening at said connecting shaft first end portion, and said clamp having a middle portion connected to and between said first and second clamp end portions, said middle portion being free from blocking the connecting shaft aperture at the connecting shaft first end portion and adapted to pass an electrical conductor from the connecting shaft aperture to a location spaced from said clamp.

4. The mounting arrangement, as set forth in claim 3, wherein said clamp first end portion has a first bore, and a first pair of bifurcated ends, and said clamp second end portion has a second bore and a second pair of bifurcated ends, said clamp first and second bores being substantially axially aligned and said connecting shaft first end portion being disposed in the clamp second bore and said input shaft being disposed in the clamp first bore, said fastening means including first and second fasteners, said first fastener being connected to said first pair of bifurcated ends and said second fastener being connected to said second pair of bifurcated ends.

5. A mounting arrangement, comprising:

a housing;

an output member having an axis, first and second spaced apart ends and an aperture extending along the axis of the output member and opening at said output member first and second ends, said output member being connected to said housing and rotatable in said housing about said axis;

a first sensor having a body and an input shaft rotatably connected to said body, said input shaft having an axis and being rotatable about said axis;

means for connecting the input shaft to said output member at a location spaced from said output member, and substantially axially aligning the axis of said input shaft with the axis of said output member, said input shaft being rotatable in response to rotation of said output member;

means for connecting the body of said first sensor to said housing and maintaining said body from rotation about the axis of the input shaft, said means for connecting the first sensor body to said housing being movable, in response to said input shaft applying a force to said first sensor body, in at least one of an axial and a radial direction relative to said input shaft axis, to reduce the force applied to said first sensor body, said means for connecting the input shaft to the output member includes;

a connecting shaft having a first end portion and being connected to said output member, said connecting shaft extending from said output member, along the output member axis, to a location at which said connecting shaft first end portion is spaced from said output member, said connecting shaft being disposed in the aperture of said output member and extending past the output member first and second ends;

a clamp having first and second spaced apart end portions and being connected at said clamp first end portion to the connecting shaft first end portion and at said clamp second end portion to said input shaft;

means for fastening the first and second clamp end portions to said connecting and input shafts, respectively;

a flange connected to said connecting shaft at a location spaced from the connecting shaft first end portion; and

means for connecting said flange to the first end of the output member.

6. The mounting arrangement, as set forth in claim 5, wherein said connecting shaft has an aperture extending along the length of the connecting shaft and opening at the connecting shaft first and second end portions, and including:

a support bracket having first and second end portions and being connected at the support bracket first end portion to the first end of the output member; and

a second sensor connected to the support bracket second end portion and the second end portion of the connecting shaft.

7. A mounting arrangement, comprising:

a housing;

an output member having an axis and being connected to said housing and rotatable in said housing about said axis;

power means for rotating the output member;

a first sensor having a body and an input shaft rotatably connected to said body, said input shaft having an axis and being rotatable about said axis;

means for connecting the input shaft to said output member at a location spaced from said output member, and substantially axially aligning the axis of said input shaft with the axis of said output member, said input shaft being rotatable in response to rotation of said output member;

means for connecting the body of said first sensor to said housing and maintaining said body from rotation about the axis of the input shaft, said means for connecting the first sensor body to said housing being movable, in response to said input shaft applying a force to said first sensor body, in at least one of an axial and a radial direction relative to said input shaft axis, to reduce the force applied to said first sensor body, said means for connecting the input shaft to the output member includes;

a connecting shaft having a first end portion and being connected to said output member, said connecting shaft extending from said output member, along the output member axis, to a location at which said connecting shaft first end portion is spaced from said output member;

a clamp having first and second spaced apart end portions and being connected at said clamp first end portion to the connecting shaft first end portion and at said clamp second end portion to said input shaft; and

means for fastening the first and second clamp end portions to said connecting and input shafts, respectively, said power means including;

a pinion gear shaft having opposed ends and a longitudinal bore opening at said pinion gear shaft opposed ends, said connecting shaft being disposed in the bore of said pinion gear shaft and extending past said pinion gear shaft ends, said pinion gear shaft being connected to said housing and positioned between said power means and said output member and extending along the axis of the output member, said pinion gear shaft being adapted to rotate about the axis of the output member and transfer rotary motion from said power means to said output member.

8. The mounting arrangement, as set forth in claim 7, wherein said connecting shaft has a second end portion and an aperture extending along the length of said connecting shaft and opening at said connecting shaft first and second end portions, said connecting shaft first end portion extending past one of the pinion gear shaft end portions, and said connecting shaft second end portion extending past the pinion gear shaft other end portion.

9. A mounting arrangement, comprising:

a housing;

an output member having an axis and being connected to said housing and rotatable in said housing about said axis;

a first sensor having a body and an input shaft rotatably connected to said body, said input shaft having an axis and being rotatable about said axis;

means for connecting the input shaft to said output member at a location spaced from said output member, and substantially axially aligning the axis of said input shaft with the axis of said output member, said input shaft being rotatable in response to rotation of said output member;

means for connecting the body of said first sensor to said housing and maintaining said body from rotation about the axis of the input shaft, said means for connecting the first sensor body to said housing being movable, in response to said input shaft applying a force to said first sensor body, in at least one of an axial and a radial direction relative to said input shaft axis, to reduce the force applied to said first sensor body, said means for connecting the input shaft to the output member includes;

a connecting shaft having a first end portion and being connected to said output member, said connecting shaft extending from said output member, along the output member axis, to a location at which said connecting shaft first end portion is spaced from said output member;

a clamp having first and second spaced apart end portions and being connected at said clamp first end portion to the connecting shaft first end portion and at said clamp second end portion to said input shaft; and

means for fastening the first and second clamp end portions to said connecting and input shafts, respectively, and said means for connecting the body of said first sensor to said housing includes;

a base member connected to said housing at a location adjacent said clamp;

a collar connected to said first sensor body; and

a linkage assembly pivotally connected to and between said collar and base member and being pivotally movable relative to said housing in response to movement of said first sensor body.

10. The mounting arrangement, as set forth in claim 9, wherein said collar has an outer surface, a bore, a plurality of threaded apertures opening at said outer surface and bore, and a plurality of threaded fasteners screwthreadably disposed in said threaded apertures of said collar, said first sensor body being disposed in said collar bore and engaged by said fasteners.

11. The mounting arrangement, as set forth in claim 10, wherein said first sensor body has a cylindrical outer surface and an annular groove disposed about said body, and fasteners being engaged in said annular groove.

12. The mounting arrangement, as set forth in claim 9, wherein said linkage assembly includes:

first and second links each having first and second spaced apart end portions, said first link being rigidly secured at said first link first end portion to said base member; and

joint means for universally pivotally connecting the first end portion of the second link to the second end portion of the first link and the second end portion of the second link to the collar.

13. The mounting arrangement, as set forth in claim 9, wherein said connecting shaft has an aperture opening at the connecting shaft first end portion, including:

an electrical conductor disposed in and extending from the aperture at the first end portion of the connecting shaft; and

a guide assembly connected to the base member and said electrical conductor, and supporting said electrical conductor at a location adjacent the first end portion of the connecting shaft.

14. A steerable axle assembly, comprising:

a housing;

an output member having an axis, and first and second end portions, and being connected to said housing and rotatable about said axis;

a steering motor mounted on said housing, connected to said output member, and adapted to rotate said output member;

a pinion gear shaft having a longitudinal bore and being rotatably connected to said housing between the steering motor and the second end portion of the output member, said pinion gear shaft extending along the axis of the output shaft and adapted to transfer rotary motion from said steering motor to said output member;

a connecting shaft having a first end portion and being connected to said output member, said connecting shaft extending axially along the output member axis from the second end portion of the output member to a location at which the connecting shaft first end portion is spaced from the second end portion of the output member, said connecting shaft being disposed in the longitudinal bore of the pinion shaft and extending past the pinion shaft;

a first sensor having a body and an input shaft rotatably connected to said body, said first sensor delivering a signal representative of the rotated position of the input shaft, said input shaft having a longitudinal axis;

means for connecting the input shaft to the first end portion of the connecting shaft and for substantially axially aligning the input shaft axis with the axis of the output member;

means for connecting the body of said first sensor to said housing and maintaining said body from rotation about the axis of said input shaft, said means for connecting the first sensor body to said housing being adapted to permit movement of the first sensor body in axial and radial directions relative to the input shaft axis;

a support bracket connected to the first end portion of the output member;

a spindle rotatably connected to said support bracket; and

a second sensor having a body and an input shaft rotatably connected to the second sensor body, said second sensor input shaft having a longitudinal axis of rotation, said second sensor body being mounted on said support bracket and said second sensor input shaft being rotatable in response to rotation of said spindle, said second sensor being adapted to deliver a signal representative of the rotated position of said second sensor input shaft.

15. The steerable axle assembly, as set forth in claim 14, wherein said connecting shaft has a second end portion and an aperture opening at said connecting shaft first and second end portions, said connecting shaft second end portion being connected to the second sensor, including:

an electrical conductor disposed in the aperture of said connecting shaft and extending past the first and second end portions of the connecting shaft; and

said means for connecting the input shaft to the connecting shaft first end portion being adapted to pass the electrical conductor from the first end portion of the connecting shaft to a location spaced from said connecting shaft first end portion.

16. The steerable axle assembly, as set forth in claim 15, wherein said means for connecting the input shaft to the connecting shaft first end portion includes a clamp having first and second spaced apart end portions, first and second bores, respectively, in said clamp first and second end portions, and a middle portion connected to and between said clamp first and second end portions and open to said clamp first and second bores, said connecting shaft first end portion being disposed in said clamp second bore, and said first sensor input shaft being disposed in the clamp first bore, said clamp first and second bores being axially aligned.

17. The steerable axle assembly, as set forth in claim 16, wherein said means for connecting said first sensor body to said housing includes first and second links pivotally connected to each other and to and between the body of said first sensor and said housing.

18. A vehicle, comprising:

a frame;

a housing connected to said frame;

an output member having an axis, first and second end portions, and being connected to said housing and rotatable about said axis;

a drive motor mounted on said housing and connected to said output member, said drive motor being adapted to rotate said output member;

a pinion gear shaft having opposed ends, a longitudinal bore opening at said opposed ends and being connected to said housing, said pinion gear shaft being located between said drive motor and said output member and positioned to lie along the axis of the output member, said pinion gear shaft being adapted to rotate about the axis of said output member and to transfer rotary motion from said drive motor to said output member;

a tubular connecting shaft having first and second end portions and being connected to said output member, said tubular connecting shaft extending from the second end of said output member, along said axis, through the pinion gear shaft bore, and to a location at which the connecting shaft first end portion is spaced from the output member second end and pinion gear shaft ends;

a supporting bracket having first and second end portions and being connected at the first end portion to the first end of the output member;

a spindle having first and second end portions and being rotatably connected to the second end portion of the supporting bracket;

a wheel mounted on the first end portion of the spindle and rotatable with said spindle;

first and second sensors each having a body and an input shaft rotatably connected to said body, said second sensor body being mounted on the second end portion of the support bracket and said second sensor input shaft being drivingly connected to the second end portion of the spindle, said second end portion of the connecting shaft being connected to said second sensor;

a clamp having first and second spaced apart end portions separated by a middle portion and being connected at said clamp second end portion to the first end portion of the tubular connecting shaft and at the clamp first end portion to the input shaft of the first sensor, said middle portion being open to the first end portion of said tubular connecting shaft and adapted to pass an electrical conductor to a location spaced from said tubular connecting shaft;

a collar connected to the body of the first sensor;

a base member connected to said housing; and

a linkage assembly pivotally connected to and between said collar and the base member, said linkage assembly being pivotally movable relative to said base member and said collar in response to movement of the body of the first sensor.