Vacuum actuated direction and speed control mechanism

• US 7,044,260 B2
• Filed: 07/11/2003
• Issued: 05/16/2006
• Est. Priority Date: 07/11/2002
• Status: Expired due to Fees

• Current Assignee: Mtd Products Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Mtd Products Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Schaedler, Axel, Bly, Scott
• Primary Examiner(s): CULBRETH, ERIC D
• Application Number:
  US10/618,002
• Publication Number:
  US 20040053742A1
• Time in Patent Office: 1,040 Days
• Field of Search: 180/336, 180/338, 180/366, 477/48, 477/46, 477/78, 477/79, 743/35, 744/731.1, 744/731.2, 744/733, 701/51, 701/60
• US Class Current: 180/336
• CPC Class Codes: B60Y 2200/124 Buggies, Quads
• CPC Class Codes: B60Y 2200/221 Tractors
• CPC Class Codes: B60Y 2200/223 Ridable lawn mowers
• CPC Class Codes: F16H 2059/0256 Levers for forward-reverse selection only, e.g. for working machines having a separate lever for switching between forward and reverse mode
• CPC Class Codes: F16H 2059/6823 Sensing neutral state of the transmission
• CPC Class Codes: F16H 59/06 the ratio being infinitely variable
• CPC Class Codes: F16H 61/2807 using electric control signals for shift actuators, e.g. electro-hydraulic control therefor F16H61/30, F16H61/32 take precedence; methods for generating shift signals F16H61/0213
• CPC Class Codes: F16H 61/30 Hydraulic or pneumatic motors or related fluid control means therefor
• CPC Class Codes: Y10T 74/20024 Fluid actuator

Abstract

An electronic control system for shifting the direction in an off road vehicle such as a lawn and garden tractor or a utility vehicle is disclosed. The control system consists of a control mechanism that activates a control circuit that in turn activates an actuator to shift the transmission. The control mechanism receives inputs from the operator and sends the appropriate output to the control circuit which thereby actuates the actuator. The control system further includes a sensor that senses neutral or not neutral. The sensor additionally supplies a neutral or not neutral input to the control mechanism. The combination of the input from the operator and the sensor indicates the direction of the vehicle.

Claims

1. An off the road vehicle comprising:

a frame;

an engine operatively supported by said frame;

at least a first ground engaging drive wheel operatively supported by said frame;

a drive system for use in selectively driving said at least first ground engaging drive wheel, said drive system being operatively connected to said engine, said drive system including a transmission having a forward condition, a reverse condition and a neutral condition for driving said ground engaging wheel, said transmission having an actuator rod attached thereto for use in shifting the transmission between the forward, reverse and neutral conditions;

a transmission control system comprising;

(1) an operator actuated activating means;

(2) a shift control mechanism that selectively receives an input from said activating means and selectively sends a corresponding output;

(3) a vacuum actuator operatively connected to said shift control mechanism and operatively connected to said actuating rod;

said vacuum actuator receiving said output from said shift control mechanism and adjusting said actuating rod to shift the transmission between said forward and reverse directions; and

(4) a sensing mechanism, said sensing mechanism comprising a sensor detector and a sensor, the sensor detector being connected to said actuator rod so as to move with the actuator rod when shifting the transmission between the forward, reverse and neutral conditions, wherein the sensor detects when the sensor detector is in a neutral condition and when the sensor detector is not in the neutral condition.

2. The off the road vehicle of claim 1 wherein:

said operator actuated activating means comprises first and second devices selectively sending corresponding first and second inputs to said shift control mechanism, said shift control mechanism sending corresponding first and second outputs; and

,

said actuator causing said actuating rod to move to a first position upon receipt of said first output wherein said first position of said adjustable member causes the at least first ground engaging drive wheel to rotate in a forward direction, said actuator causing said actuating rod to move to a second position upon receipt of said second output wherein said second position of said actuating rod causes the at least first ground engaging drive wheel to rotate in a reverse direction.

3. A direction control system for an off-road vehicle having a drive system that selectively drives at least one ground engaging drive wheel, the drive system including a transmission having a forward condition, a reverse condition and a neutral condition for driving said ground engaging wheel, the control system comprising:

a plurality of push buttons, said push buttons comprising at least a forward, a reverse and a neutral push button;

a vacuum actuator;

an actuator rod operatively connected to the transmission and to the vacuum actuator, where the actuator rod is movable in first and second directions by said vacuum actuator into a forward position, a reverse position, and a neutral position thereby commanding the transmission into said transmission into forward condition, the reverse condition, and the reverse condition, respectively;

a shift control mechanism that receives inputs from said plurality of push button and uses said inputs to control the vacuum actuator to selectively move the actuator rod to shift the transmission between the forward, reverse and neutral conditions based on the condition of said plurality of push buttons; and

a sensing mechanism, said sensing mechanism comprising a sensor detector and a sensor, the sensor detector being connected to said actuator rod so as to move with the actuator rod when shifting the transmission between the forward, reverse and neutral conditions, wherein the sensor detects when the actuator rod is in a neutral position and when the actuator rod is not in the neutral position.

4. The direction control system of claim 3 wherein the shift control mechanism selectively activates a forward switch and a reverse switch, wherein activation of the forward switch energizes a first solenoid that causes the vacuum actuator to move the actuator rod in the first direction and activation of the reverse switch energizes a second solenoid that causes the vacuum actuator to move the actuator rod in the second direction.

5. The direction control system of claim 4 wherein the shift control mechanism comprises a microprocessor based shift module that receives inputs from said plurality of push buttons to selectively activate said forward and reverse switches.

6. The direction control system of claim 5 wherein the sensor is a ball switch that sends a neutral or not neutral signal to the shift module.

7. The direction control system of claim 6 wherein the sensor detector is triangular in shape that includes an arcuate portion at the bottom and a hub near the top, wherein a notch is centrally located within the arcuate portion that receives the ball sensor when the sensor detector is in a neutral position, and the hub receives a transmission rod operatively connected to the transmission that shifts the transmission between forward, reverse and neutral conditions.