Resilient mount assembly

• US 5,033,722 A
• Filed: 08/21/1989
• Issued: 07/23/1991
• Est. Priority Date: 08/21/1989
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Lammers, Bryan G.
• Primary Examiner(s): Butler, Douglas C.
• Application Number:
  US07/396,169
• Time in Patent Office: 701 Days
• Field of Search: 267/153, 267/140.2, 267/140.5, 267/141, 267/141.1, 267/141.2, 267/152, 267/292, 267/293, 267/294, 267/277, 267/276, 267/281, 267/282, 403/133, 403/132, 403/225, 403/228, 403/162, 403/227, 403/145, 384/221, 384/222, 384/192, 384/202, 384/203, 384/206, 248/606, 248/630, 248/603, 248/609, 416/134 A, 416/134 R
• US Class Current: 267/153
• CPC Class Codes: F16F 1/393 with spherical or conical sleeves
• CPC Class Codes: Y10T 403/32721 Elastomeric seat
• CPC Class Codes: Y10T 403/458 Composite bushing with elastomeric component

Abstract

Resilient mount assemblies provide absorption of induced loads while permitting some degree of relative rotation between the elements. It is desirable to have resilient mount assemblies which can withstand heavy operating loads while having high angular rotation. In this arrangement, a resilient mount assembly is provided having a segmented assembly interconnecting a first member having a spherical outer surface with a second member having a transverse bore therein. The segmented assembly includes first and second semi-circular half shells with first, second, third, and fourth semi-circular elastomeric layers disposed on respective first and second sides thereof. The first and second semi-circular half shells and their respective first, second, third, and fourth semi-circular elastomeric layers are disposed in intimate contact with the spherical outer surface of the first member. A preloading mechanism is provided and operative to induce a radial force into the first, second, third, and fourth semi-circular elastomeric layers during the assembly thereof. Once the preloading mechanism has been pressed to its full assembled position, the resilient mount assembly has the ability to withstand high operating loads while still having the ability to have high angular rotation between the elements thereof.

Claims

1. A resilient mount assembly, comprising:

a first member having a longitudinal axis with an outer surface disposed about the longitudinal axis, the outer surface being generally spherical in shape with a center of radius at a point on the longitudinal axis;

a second member having an end portion defining a transverse bore therein, the first and second members being pivotally interconnected and when assembled a center line of the transverse bore generally intersects the center of radius point located on the longitudinal axis of the first member;

a segmented assembly operative when assembled to interconnect the first and second members, the segmented assembly including first and second semi-circular half shells with each of the semi-circular half shells having first and second semi-circular elastomeric layers disposed on an inner side thereof and third and fourth semi-circular elastomeric layers disposed on an outer side thereof, when assembled each of the first and second semi-circular elastomeric layers is in intimate contact with the spherical outer surface of the first member, and the segmented assembly further includes preloading means for substantially, uniformly loading each of the first, second, third, and fourth semi-circular elastomeric layers to a predetermined level; and

the predetermined level of loading of the respective first, second, third and fourth semi-circular elastomeric layers is to a level that during operation of the resilient mount assembly all portions of the respective first, second, third, and fourth semi-circular elastomeric layers remain in compression while the first member and the second member have the ability to rotate relative to each other through a range of approximately 40 degrees, the relative rotation of the first and second members is attributed solely through the shear deformation of the elastomeric material in the respective elastomeric layers.

2. The resilient mount assembly, as set forth in claim 1, wherein the preloading means includes first and second rings each when assembled being in intimate contact with each of the third and fourth elastomeric layers.

3. The resilient mount assembly, as set forth in claim 2, wherein each of the first and second rings have first and second sides, a radial outer surface of a size sufficient for insertion into the transverse bore of the second member, and a radial inner concave surface in which the radial inner surface extends further radially outward from the first side thereof to the second side, the first and second rings are located in the transverse bore of the second member and the first side of the first ring is adjacent one side of the second member while the first side of the second ring is adjacent the other side of the second member.

4. The resilient mount assembly, as set forth in claim 3, wherein the respective first, second, third, and fourth semi-circular elastomeric layers are bonded to the respective first and second semi-circular half shells.

5. The resilient mount assembly, as set forth in claim 4, wherein the preloading means includes compression means for pressing the first and second rings into a position to preload the semi-circular elastomeric layers.

6. The resilient mount assembly, as set forth in claim 5, wherein the compression means includes a second compression plate releasably secured to the other side of the second member adjacent the transverse bore and operative during assembly to contact the first side of the second ring and press it into the transverse bore.

7. The resilient mount assembly, as set froth in claim 6, wherein the compression means includes a second compression plate releasably secured to the other side of the second member adjacent the transverse bore and operative during assembly to contact the first side of the second ring and press it into the transverse bore.

8. The resilient mount assembly, as set forth in claim 7, wherein the first and second compression plates are each releasably secured to the second member by securing means.

9. The resilient mount assembly, as set forth in claim 8, wherein the securing means includes a plurality of bolts.

10. The resilient mount assembly, as set forth in claim 1, wherein each of the first, second, third, and fourth semi-circular elastomeric layers are made from a natural rubber base compound.

11. The resilient mount assembly, as set forth in claim 10, wherein the natural rubber base compound has a hardness within a range of 50 to 85 durometer.

12. The resilient mount assembly, as set forth in claim 11, wherein the hardness of the natural rubber base compound is preferably within a range of 70 to 80 durometer.