GB2345098A - Differential lock engaging arrangement - Google Patents

Differential lock engaging arrangement Download PDF

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Publication number
GB2345098A
GB2345098A GB9828515A GB9828515A GB2345098A GB 2345098 A GB2345098 A GB 2345098A GB 9828515 A GB9828515 A GB 9828515A GB 9828515 A GB9828515 A GB 9828515A GB 2345098 A GB2345098 A GB 2345098A
Authority
GB
United Kingdom
Prior art keywords
differential lock
elongate
actuating arrangement
bracket
pedal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9828515A
Other versions
GB2345098B (en
GB9828515D0 (en
Inventor
Derek John Smith
David William Seccull
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGCO Ltd
Original Assignee
AGCO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AGCO Ltd filed Critical AGCO Ltd
Priority to GB9828515A priority Critical patent/GB2345098B/en
Publication of GB9828515D0 publication Critical patent/GB9828515D0/en
Publication of GB2345098A publication Critical patent/GB2345098A/en
Application granted granted Critical
Publication of GB2345098B publication Critical patent/GB2345098B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00Buckles, buttons, clasps, etc.
    • Y10T24/44Clasp, clip, support-clamp, or required component thereof
    • Y10T24/44573Clasp, clip, support-clamp, or required component thereof including track or way guided and retained gripping member
    • Y10T24/44615Clasp, clip, support-clamp, or required component thereof including track or way guided and retained gripping member with position locking-means for gripping members

Abstract

A differential lock actuating arrangement comprises a pedal assembly 1 including a substantially elongate member 2, means to connect the elongate member 2 to a differential lock actuator 22, rotating means 4a and 4b to rotate the elongate member 2 about its longitudinal axis and biassing means 12 to hold the elongate member 2 in a first differential lock engaging position and a second differential lock disengaging position.

Description

2345098 Differential Lock Engaging Arrangement
Field of the Invention
This invention relates to an arrangement for engaging a differential lock, and in particular to a mechanical arrangement for engaging the differential lock in the back axle of a vehicle such as an agricultural tractor.
Background to the Invention
Agricultural tractors are usually provided with a differential lock in the back axle for reasons well known to those skilled in the art.
One requirement of a differential lock arrangement for a tractor is that it can be easily engaged and disengaged. In fieldwork the driver must be able to engage the differential lock quickly when one drive wheel starts to spin faster than the other. Furthermore, tractors are required to make tight headland turns, and therefore it must be possible to disengage the differential lock quickly, otherwise the tractor driver will not be able to turn the vehicle and may crash into a hedge or ditch with possible disastrous consequences.
It is known to Provide electro-hydraulic control systems, which engage and disengage the differential lock at the flick of a switch. In more complicated control systems sensors engage and disengage the differential lock automatically to ensure the optimum and safe performance of the tractor.
In many countries of the world there is not the requirement for, or the ability to maintain, complex electro-hydraulic control systems, and there is therefore a need to control engagement and disengagement of the differential lock mechanically. The present invention is concerned with mechanical arrangements for engaging and disengaging the differential lock.
In one known mechanical arrangement for controlling the engagement and disengagement of the differential lock a pedal is mounted on the tractor chassis. To engage the differential lock the tractor driver depresses the pedal with his foot. The tractor driver must keep his foot on the pedal whilst he wishes to have the differential lock engaged. When the driver removes his foot from the pedal the differential lock moves out of engagement.
When using a tractor for fieldwork, for example ploughing, engagement of the differential lock may be required most of the time. It would therefore be desirable to provide a mechanical differential lock engaging arrangement which does not require the driver to constantly depress a pedal whilst engagement of the differential lock is required.
EP292620 describes a differential lock pedal control system, which upon depression of the pedal, engages the differential lock. The differential lock is maintained in engagement by the control system when the driver removes his foot from the pedal. When the driver wishes to disengage the differential lock he depresses the pedal again, and the control system disengages the differential lock.
The pedal control system described in EP262620 comprises many parts, is complex, and expensive to manufacture.
1 It would therefore be desirable to provide a mechanical differential lock control arrangement which does not suffer from the problems associated with the prior art.
Summary of the Invention
The invention provides a differential lock actuating arrangement comprising a pedal assembly including a substantially elongate member, mounting means to mount the said elongate member on the chassis of a vehicle, means to connect the said elongate member to a differential lock actuator, rotating means to rotate the said substantially elongate member about its longitudinal axis, wherein the mounting means mounts the said elongate member for movement between a first differential lock engaging position and a second differential lock disengaging position, and wherein the arrangement fin-ther comprises biasing means to hold the elongate member in one of the said first and second positions.
Preferably, the means to connect the said elongate member to the differential lock actuator comprises an over-centre cam mechanism. The over-centre cam mechanism may comprise a bracket fixed to the said substantially elongate member, and a linking member, wherein one end of the said linking member is pivotally attached to the differential lock actuator and the other end is pivotally attached to the said bracket.
Preferably, the mounting means includes a bracket comprising a slot, wherein the substantially elongate member is mounted in the said slot, and is permitted to move in the longitudinal direction of the slot, and wherein the biasing means is arranged to pull the elongate member towards the closed end of the slot. The biasing means may be attachable to the bracket and the substantially elongate member. The substantially elongate member may be provided with stops, which co-operate with the bracket to limit movement of the substantially elongate member in its longitudinal direction.
The rotating means may comprise a lever extending to either side of the longitudinal axis of the said substantially elongate member, and preferably, the lever is provided with engagement members, wherein upon exertion of pressure on one of the engagement members, the substantially elongate member is caused to rotate. Advantageously, the engagement members each comprise a pedal, The invention also provides a tractor comprising a differential lock actuating arrangement as described.
Brief Description of the Drawings
In the drawings, which illustrate exemplary embodiments of the invention:
Figure 1 is a plan view of differential lock control system according to the invention; Figure 2 is a side view of the differential lock control system shown in Figure 1; Figure 3 is an end view of the differential lock control system shown in Figures I and 2; Figure 4 is side view of a component of the differential lock control system shown in Figures I to 3; 2 Figure 5 is a schematic illustration of a differential lock mechanism operable by a control system of the invention; and Figure 6 is a plan view of a tractor comprising a differential lock control system according to the invention.
Detailed Description of the Preferred Embodiment
Referring now to Figures I to 3 there is shown a pedal arrangement I mounted on a tractor, the pedal arrangement comprising an elongate rod 2 to one end of which there is connected a substantially U-shaped member 3. Pedals 4a, 4b are attached to each of the free ends of the U-shaped member 3.
The elongate rod 2 is supported in brackets at each of its ends. The pedal end is supported in a part of the seat deck 5, which forms part of the tractor X. A reinforcement plate 6 is attached to the seat deck 5 to strengthen the support. At the pedal end the elongate rod may rotate about its own axis, but is otherwise constrained from movement.
The free end of the elongate rod 2 is mounted in a bracket 7, which is attached to the back axle 37 of the tractor X by bolts 10. The bracket 7 comprises a slot I I in which the free end of the elongate rod 2 is mounted. The elongate rod 2 is constrained from axial movement by means of washers 8, 9, which are secured to the said rod 2.
It can be seen from Figure I that in plan view the bracket 7 is substantially L-shaped. A spring 12 is provided to bias the elongate rod 2 towards the chassis of the tractor X. One end of the spring 12 is attached to the bracket 7, whilst the other is attached to the elongate rod 2. In the position shown in Figures I to 3, the free end of elongate rod 2 sits in the slot 11, and rests against the closed end of the said slot.
Figure 4 illustrates the differential lock engagement pin. The pin 22 is mounted in the crown wheel and pinion housing 35. A bracket 20 is mounted externally of the housing 35 and is attached to the pin 22. The bracket 20 has a threaded portion, which is screwed into the pin 22, and a flexible cusp 21 is provided between the bracket 20 and the side of the crown wheel and pinion housing 35.
The pin 22 is slidably mounted in the housing 35 so that it can move in the directions indicated by arrow A. Moving the pin 22 to the left engages the differential lock, whereas moving the pin 22 to the right disengages the differential lock.
Referring again to Figures I to 3, it can be seen that a bracket 23 is attached to the elongate rod 2. The bracket 23 is connected to a pair of links 24 by means of a pin 25. The links 24 are also connected to the bracket 20, again by means of a pin 25.
The pin 22 is moved in the directions indicated by the arrow A by depressing one of the pedals 4a, 4b.
The manner in which the differential lock control system works will now be explained with reference to Figures I to 4.
3 With the pedal 4a in the position shown in the Figures 1 to 3, i.e. uppermost, the pin 22 is withdrawn from the differential and the differential lock is disengaged. When the driver of the tractor depresses pedal 4a the elongate rod 2 rotates about its own axis Y-Y. The pin 2 is pushed to the left in the direction indicated by arrow A. As the pedal 4a is being depressed the link 23 moves through an are, and at the same time pivots with respect to the link 25. In Figure 3 the angle B is acute. When the pedal 4a has been depressed, the pin 25 connecting the bracket 23 to the links 24 moves over centre so and the angle B becomes obtuse. The spring 12 holds the pin 22 in the engaged position.
If the driver wishes to disengage the differential lock he depresses the pedal 4b. This causes the elongate rod 2 to rotate about its axis Y-Y back into the position shown in Figures 1 to 3.
It can be seen from Figure 3 that the slot in which the end of the elongate rod 2 rests has an open end. At the moment the driver decides to depress the pedal 4a to engage the differential lock, the dogs of the differential lock may not be aligned. If this is the case the free end of the elongate rod 2 will move away from its seat in the slot 11 as the pedal 4a is depressed. The pin 25 connecting links 24 to bracket 23 will still move over centre. The pin 22 will move to the left in the direction indicated by arrow A when the dogs of the differential lock are aligned. This provides for engagement of the differential lock when the tractor is on the move.
Referring now to Figure 5, there is shown a differential locking mechanism 34, in the form of a sleeve 36 splined on to a shaft 26 which carries a differential pinion gear. Sleeve 36 has teeth 31 which are engageable with corresponding teeth 28 provided on part of a support 29 for the crown-wheel of the differential. Thus in order to engage the differential lock it is necessary to move the operating rod 22 in the direction A to engage teeth 31 and 28. This is achieved by depressing the pedal 4a which pivots the elongate rod 1 about axis Y-Y and causes the over-centre cam mechanism to move from the differential lock disengaging position to the differential lock engaging position. If the teeth 31 and 28 are not aligned for engagement so that rod 22 cannot be moved by plunger 30, the rotation of the elongate rod 1 caused by depression of the pedal 4a results in the elongate rod 1 moving in the direction Z in Figure 1, this movement tensioning the spring 12. The energy stored in the spring is then used to move the rod 22 when the teeth 31, 28 are aligned.
The differential lock engaging arrangement of the invention meets the operational requirements of a tractor operator insofar as it can be engaged on the move, once engaged the operator may remove his foot from the pedal, and engagement and disengagement only requires the operator to depress the uppermost pedal. The arrangement is simple to manufacture, and maintain, and is not subject to a great deal of wear because it comprises relatively few moving parts.
4

Claims (11)

Claims
1) A differential lock actuating arrangement comprising a pedal assembly including a substantially elongate member, mounting means to mount the said elongate member on the chassis of a vehicle, means to connect the said elongate member to a differential lock actuator, rotating means to rotate the said substantially elongate member about its longitudinal axis, wherein the mounting means mounts the said elongate member for movement between a first differential lock engaging position and a second differential lock disengaging position, and wherein the arrangement flirther comprises biasing means to hold the elongate member in one of the said first and second positions.
2) A differential lock actuating arrangement according to Claim 1, wherein the means to connect the said elongate member to the differential lock actuator comprises an overcentre cam mechanism.
3) A differential lock according to Claim 2, wherein the said over-centre cam mechanism comprises a bracket fixed to the said substantially elongate member, and a linking member, wherein one end of the said linking member is pivotally attached to the differential lock actuator and the other end is pivotally attached to the said bracket.
4) A differential lock actuating arrangement according to any preceding claim, wherein the said mounting means includes a bracket comprising a slot, wherein the substantially elongate member is mounted in the said slot, and is permitted to move in the longitudinal direction of the slot, and wherein the biasing means is arranged to pull the elongate member towards the closed end of the slot.
5) A differential lock actuating arrangement according to Claim 4, wherein the said biasing means is attachable to the bracket and the substantially elongate member.
6) A differential lock actuating arrangement according to Claim 4 or 5, wherein the substantially elongate member is provided with stops, which co-operate with the bracket to limit movement of the substantially elongate member in its longitudinal direction.
7) A differential lock actuating arrangement according to any preceding claim, wherein the rotating means comprises a lever extending to either side of the longitudinal axis of the said substantially elongate member.
8) A differential lock actuating arrangement according to Claim 7, wherein the lever is provided with engagement members, wherein upon exertion of pressure on one of the engagement members, the substantially elongate member is caused to rotate.
9) A differential lock actuating arrangement according to Claim 8, wherein the said engagement members each comprise a pedal.
10) A tractor comprising a differential lock actuating arrangement according to any of Claims 1 to 10.
11) A differential lock actuating arrangement substantially as described with reference to, and as shown in, the drawings.
6
GB9828515A 1998-12-23 1998-12-23 Differential lock engaging arrangement Expired - Fee Related GB2345098B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9828515A GB2345098B (en) 1998-12-23 1998-12-23 Differential lock engaging arrangement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9828515A GB2345098B (en) 1998-12-23 1998-12-23 Differential lock engaging arrangement
EP99125465A EP1013495A3 (en) 1998-12-23 1999-12-21 Differential lock engaging arrangement
US09/468,048 US6390226B1 (en) 1998-12-23 1999-12-21 Differential lock engaging arrangement
TR1999/03226A TR199903226A3 (en) 1998-12-23 1999-12-23 Differential lock attachment mechanism.

Publications (3)

Publication Number Publication Date
GB9828515D0 GB9828515D0 (en) 1999-02-17
GB2345098A true GB2345098A (en) 2000-06-28
GB2345098B GB2345098B (en) 2002-11-27

Family

ID=10844946

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9828515A Expired - Fee Related GB2345098B (en) 1998-12-23 1998-12-23 Differential lock engaging arrangement

Country Status (4)

Country Link
US (1) US6390226B1 (en)
EP (1) EP1013495A3 (en)
GB (1) GB2345098B (en)
TR (1) TR199903226A3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7650961B2 (en) * 2006-12-08 2010-01-26 Deere & Company Differential lock control system and associated method
US8056697B2 (en) * 2006-12-22 2011-11-15 Deere & Company Brake/differential lock pedal linkage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1092522A (en) * 1964-02-11 1967-11-29 Landini Spa Differential lock
US3963088A (en) * 1975-08-07 1976-06-15 Gunderson Ralph R Traction control device
GB2175360A (en) * 1985-05-11 1986-11-26 Turner Int Mower with locking differential
JPS6416468A (en) * 1987-07-10 1989-01-19 Iseki Agricult Mach Controlling gear for riding tractor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2017146A1 (en) * 1970-04-10 1971-12-02 Steyr-Daimler-Puch Ag, Wien Device for actuating the differential lock on farm tractors
US4150586A (en) * 1976-09-03 1979-04-24 Massey-Ferguson Inc. Control mechanism
US4113044A (en) * 1976-12-15 1978-09-12 Allis-Chalmers Corporation Articulated steering differential lock release
US4126202A (en) * 1977-07-20 1978-11-21 Massey-Ferguson, Inc. Vehicle control box module
CA1168559A (en) * 1981-06-04 1984-06-05 John L. Old Lockable pedal arrangements
US4469208A (en) * 1981-12-18 1984-09-04 Allis-Chalmers Corporation Control for differential lock
GB2190985B (en) * 1986-05-27 1989-12-13 Massey Ferguson Mfg Pedal actuators
JPH0582637U (en) * 1992-04-09 1993-11-09 株式会社 神崎高級工機製作所 Work vehicle transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1092522A (en) * 1964-02-11 1967-11-29 Landini Spa Differential lock
US3963088A (en) * 1975-08-07 1976-06-15 Gunderson Ralph R Traction control device
GB2175360A (en) * 1985-05-11 1986-11-26 Turner Int Mower with locking differential
JPS6416468A (en) * 1987-07-10 1989-01-19 Iseki Agricult Mach Controlling gear for riding tractor

Also Published As

Publication number Publication date
TR199903226A3 (en) 2000-08-21
EP1013495A2 (en) 2000-06-28
EP1013495A3 (en) 2002-01-09
GB9828515D0 (en) 1999-02-17
GB2345098B (en) 2002-11-27
US6390226B1 (en) 2002-05-21
TR199903226A2 (en) 2000-08-21

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20091223