GB2082284A - Shifting Mechanism for a Dog Clutch to Engage Front Wheel Drive on Vehicles with All Wheel Drive - Google Patents

Shifting Mechanism for a Dog Clutch to Engage Front Wheel Drive on Vehicles with All Wheel Drive Download PDF

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Publication number
GB2082284A
GB2082284A GB8125055A GB8125055A GB2082284A GB 2082284 A GB2082284 A GB 2082284A GB 8125055 A GB8125055 A GB 8125055A GB 8125055 A GB8125055 A GB 8125055A GB 2082284 A GB2082284 A GB 2082284A
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GB
United Kingdom
Prior art keywords
gear shifting
compression spring
stop
shifting mechanism
preselector
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
GB8125055A
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GB2082284B (en
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ZETOR NP
Original Assignee
ZETOR NP
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 ZETOR NP filed Critical ZETOR NP
Publication of GB2082284A publication Critical patent/GB2082284A/en
Application granted granted Critical
Publication of GB2082284B publication Critical patent/GB2082284B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/348—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed
    • B60K17/35—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches
    • B60K17/352—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches manually operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D11/00—Clutches in which the members have interengaging parts
    • F16D11/08—Clutches in which the members have interengaging parts actuated by moving a non-rotating part axially
    • F16D11/10—Clutches in which the members have interengaging parts actuated by moving a non-rotating part axially with clutching members movable only axially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Operated Clutches (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

The purpose of the invention is to enable, by means of a spring, both engagement and disengagement of a front drive dog clutch to be preselected. A hand-operated preselector 1 acting on a compression spring 8 affecting via a transmission mechanism a displaceable shifting sleeve 14 has both a stop 2 protruding into a recess of a fixed gate 4 and a recessed member 17 in its bottom part to receive the compression spring located between two floating inserts 5 locked by nuts 9. The compression spring is positioned, together with its floating inserts, in a guide bush 7. One end of the bush is closed by a union nut 6 and the other end is fixed to a lower arm 10 forming a part of the transmission mechanism, the fork 20 of which protrudes, by its arms, into a peripheral groove of the displaceable shifting sleeve positioned co-axially with a dog clutch 16. <IMAGE>

Description

SPECIFICATION Gear Shifting Mechanism for a Load Preselected Front Drive Engagement on Vehicles with All Wheel Drive This invention relates to a gear shifting mechanism for a load preselected front drive engagement on vehicles with all wheel drive.
Particularly but not exclusively tractors, making use of a spring enabling the engagement and disengagement of a front drive dog clutch to be preselected.
At present lever-type, hand-operated, relatively complicated mechanisms are used for the engagement of dog clutches of front drive tractor axles utilizing two control springs, one spring acting as an engaging spring and the other a return spring as a disengaging spring. The disadvantage of this arrangement lies in a complicated performance and a demanding production. To tractors having high performance an advanced mechanical-pneumatic system is applied making use of electromagnetic control valves. Such a system has a high initial cost.
According to the invention there is provided a gear shifting mechanism for a load preselected front drive engagement on vehicles with all wheel drive, particularly but not exclusively tractors, comprising a hand-operated preselector acting on a prestressed spring affecting via a transmission mechanism a displaceable gear shifting sleeve, the preselector having both a stop protruding into a recess of a fixed gate and a recessed member in its bottom part to receive the compression spring located between two floating inserts locked by nuts, the compression spring being positioned, together with its floating inserts, in a guide bush, one end of the bush being closed by a union nut and the other end being fixed to a lower arm forming a part of the transmission mechanism, the fork of which protrudes, by its arms, into a peripheral groove of the displaceable gear shifting sleeve positioned co-axially with a dog clutch.
Preferably the fixed gate is provided with a recess intended for two positions of the stop being separated by a flat portion from each other, the manipulation stroke of the stop equalling at least the sum of the flat portion width and the stop width and being less than the assembly length of the prestressed compression spring. An extension spring may be fitted with one end on the stop. It is also preferred that the sum of the prestressed compression spring length and the thickness of either floating insert equals the length of the guiding bush.
The transmission mechanism preferably comprises the lower arm connected by a pin with one end of a lever, the other end of the lever being connected with the fork by means of a connecting pin. Preferably the preselector passes through a guiding insert located in the cab floor under which the stop is provided.
By way of example, a specific embodiment in accordance with the invention will be described with reference to the accompanying diagrammatic drawings in which: Figure 1 is a general arrangement of a gear shifting mechanism: Figure 1 a is a detailed location of the stop in the fixed gate of the mechanism of Figure 1; Figures 2 and 2a show the preselected position for engaging; Figures 3 and 3a illustrates the position after engaging; Figures 4 and 4a illustrate the preselected position for disengaging; and Figures 5 and 5a show the position after disengaging.
This example concerns a gear shifting mechanism for a load preselected front drive engagement on a tractor or other vehicle with all wheel drive. Within easy reach of the driver a preselector 1 with a handle 18 is positioned in a suitable position passing through a guiding insert 1 5 located in the cab floor 21. A stop 2 is fixed onto the preselector 1 protruding into the recess of a fixed gate 4. The stop 2 is locked in the preselected position by an extension spring 3. The lower part of the preselector 1 is provided with a recessed member 1 7 onto which a prestressed compression spring 8 is slid between two floating inserts 5. The floating inserts 5 with the compression spring 8 are closed in a guide bush 7, the lower end of which is fitted onto a lower arm 10, its top end being closed by a union nut 6.
The prestressing of the compression spring 8 to the assembly length L has been carried out by means of nuts 9 screwed on the recessed member 17 of the preselector 1, the assembly length L of the compression spring 8 including the thickness of either floating insert 5 equalling the length D of the guiding bush 7. The prestressing of the compression spring 8 has been selected in such a way so as to obtain the necessary force to engage or disengage a displaceable gear shifting sleeve 14 upon a further compression of the manipulation stroke A.
The fixed gate 4 is provided with a recess for the top utmost position F and the bottom utmost position E of the stop 2. The necessary manipulation stroke A of the stop 2 equals at least the sum of the width C of a flat portion 22 and the width B of the stop 2, this manipulation stroke A being less than the assembly length L of the prestressed compression spring 8.
The end of the lower arm 10 is provided with a pin 11 onto which one end of a lever 12 is fitted, the other end of which is slid on a connecting pin 13 being in turn connected with a fork 20. The fork 20 is provided, on its free end, with prisms 23 protruding into a peripheral groove of a displaceable gear shifting sleeve 14 positioned co-axially opposite to a dog clutch 1 6. The lower arm 10, the lever 12 with the pin 11 and a fork 20 with the connecting pin 13 comprise the parts of a transmission mechanism 19 of the gear shifting mechanism.
The principle of operation of the gear shifting mechanism is that the compression spring 8 is compressed upon preselecting the engaged position by means of the preselector 1 and the floating inserts 5, the spring automatically displacing on travel, via the transmission mechanism 19, the gear shifting sleeve 14 into engagement or disengagement with the dog clutch 1 6.
The detailed function of the gear shifting mechanism upon engagement preselection and after front drive engagement is as follows:- The preselector 1 is displaced into its bottom position where the stop 2 is secured by the extension spring 3 in the recess of the fixed gate 4 in the position E. The compression spring 8 is compressed and affects by force via the transmission mechanism 19 the displaceable gear shifting sleeve 14 in the direction of the engagement with the dog clutch 16. The force connection and thus the engagement of the front drive takes place as soon as the teeth of the displaceable gear shifting sleeve 14 has been thrown into mesh, due to different wheel speed, with the teeth of the dog clutch 16.
The function of the gear shifting mechanism upon disengagement preselection of the front drive is analogous. The preselector 1 is displaced into the top position where the stop 2 is secured by the compression spring 3 in the recess of the fixed gate 4in the position F. The compression spring 8 is compressed between two floating inserts 5 and applies a force via the transmission mechanism 19 on the displaceable gear shifting sleeve 14 in the direction out of engagement with the dog clutch 16. The interruption of the force connection and thus a disengagement of the front drive takes place as soon as the displaceable gear shifting sleeve 14 has been loosened, due to different speed of the front and rear wheels, and thrown out of engagement with the dog clutch 16.
An advantage of the gear shifting mechanism described above is a considerably simplified construction lying especially in a double function of the compression spring both for engaging and disengaging the front drive dog clutch. By means of this provision the number of necessary parts may be reduced, all functions being maintained.

Claims (7)

Claims
1. A gear shifting mechanism for a load preselected front drive engagement on vehicles with all wheel drive, particularly but not exclusively tractors, comprising a hand-operated preselector acting on a prestressed compression spring affecting via a transmission mechanism a displaceable gear shifting sleeve, the preselector, having both a stop protruding into a recess of a fixed gate and a recessed member in its bottom part to receive the compression spring located between two floating inserts locked by nuts, the compression spring being positioned, together with its floating inserts, in a guide bush, one end of the bush being closed by a union nut and the other end being fixed to a lower arm forming a part of the transmission mechanism, the fork of which protrudes, by its arms, into a peripheral groove of the displaceable gear shifting sleeve positioned co-axially with a dog clutch.
2. A gear shifting mechanism according to Claim 1, wherein the fixed gate is provided with a recess intended for two positions of the stop being separated by a flat portion from each other, the manipulation stroke of the stop equalling at least the sum of the flat portion width and the stop width and being less than the assembly length of the prestressed compression spring.
3. A gear shifting mechanism according to Claim 1 or Claim 2, wherein an extension spring is fitted with one end on the stop.
4. A gear shifting mechanism according to any one of the preceding claims, wherein the sum of the prestressed compression spring length and the thickness of either floating insert equals the length of the guide bush.
5. A gear shifting mechanism according to any one of the preceding claims, wherein the transmission mechanism comprises the lower arm connected by a pin with one end of a lever, the other end of the lever being connected with the fork by means of a connecting pin.
6. A gear shifting mechanism according to any one of the preceding claims, wherein the preselector passes through a guiding insert located in the cab floor under which the stop is provided.
7. A gear shifting mechanism substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB8125055A 1980-08-18 1981-08-17 Shifting mechanism for a dog clutch to engage front wheel drive on vehicles with all wheel drive Expired GB2082284B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS564680A CS212111B1 (en) 1980-08-18 1980-08-18 Gearing mechanism for,under load, eligible gear changing of the front drive of vehicles with propulsion of all four wheels

Publications (2)

Publication Number Publication Date
GB2082284A true GB2082284A (en) 1982-03-03
GB2082284B GB2082284B (en) 1984-09-26

Family

ID=5401698

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8125055A Expired GB2082284B (en) 1980-08-18 1981-08-17 Shifting mechanism for a dog clutch to engage front wheel drive on vehicles with all wheel drive

Country Status (4)

Country Link
CS (1) CS212111B1 (en)
DE (1) DE3129871A1 (en)
FR (1) FR2488553A1 (en)
GB (1) GB2082284B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345958A1 (en) * 1988-05-21 1989-12-13 Nissan Motor Co., Ltd. Clutch linkage arrangement with pedal depression assisting mechanism
FR2707932A1 (en) * 1993-05-20 1995-01-27 Kubota Kk Lawnmower tractor movement control structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1238422B (en) * 1989-12-22 1993-07-26 Fiat Auto Spa CONTROL UNIT OF AN INTEGRAL DRIVE DISARMABLE FOR CARS.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345958A1 (en) * 1988-05-21 1989-12-13 Nissan Motor Co., Ltd. Clutch linkage arrangement with pedal depression assisting mechanism
US5044223A (en) * 1988-05-21 1991-09-03 Nissan Motor Co., Ltd. Pedal depression assisting mechanism
US5165299A (en) * 1988-05-21 1992-11-24 Nissan Motor Co., Ltd. Pedal depression assisting mechanism
FR2707932A1 (en) * 1993-05-20 1995-01-27 Kubota Kk Lawnmower tractor movement control structure

Also Published As

Publication number Publication date
FR2488553A1 (en) 1982-02-19
FR2488553B3 (en) 1984-05-25
DE3129871A1 (en) 1982-03-25
GB2082284B (en) 1984-09-26
CS212111B1 (en) 1982-02-26

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PCNP Patent ceased through non-payment of renewal fee