KR20160145224A - Locking device for differential for tractor - Google Patents

Locking device for differential for tractor Download PDF

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Publication number
KR20160145224A
KR20160145224A KR1020150081174A KR20150081174A KR20160145224A KR 20160145224 A KR20160145224 A KR 20160145224A KR 1020150081174 A KR1020150081174 A KR 1020150081174A KR 20150081174 A KR20150081174 A KR 20150081174A KR 20160145224 A KR20160145224 A KR 20160145224A
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KR
South Korea
Prior art keywords
differential
clutch
clutch member
axle housing
piston
Prior art date
Application number
KR1020150081174A
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Korean (ko)
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KR101709399B1 (en
Inventor
강영선
정삼석
김영일
Original Assignee
동양물산기업 주식회사
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Priority to KR1020150081174A priority Critical patent/KR101709399B1/en
Publication of KR20160145224A publication Critical patent/KR20160145224A/en
Application granted granted Critical
Publication of KR101709399B1 publication Critical patent/KR101709399B1/en

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    • 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
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • 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
    • B60K17/02—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of clutch
    • 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
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)

Abstract

The present invention provides a differential locking device for a tractor. The differential locking device for a tractor comprises: an axel housing; a differential device installed in the axel housing; and a pair of output shafts (52) connected to a left and a right side of the differential device. The differential locking device for a tractor further comprises: a clutch unit (44C) formed on an outer end of a first differential casing of the differential device; a clutch member (80) having a clutch unit (82) to be mounted on the clutch unit (44C), wherein a middle portion thereof is spline-mounted on a first output shaft to be moved in an axial direction on the outside of the first differential casing; and a drive means installed in the axel housing to mount the clutch unit (82) of the clutch member (80) on the clutch unit (44C) of the first differential casing or separate the clutch unit (82) of the clutch member (80) from the clutch unit (44C) of the first differential casing. The drive means consists of a hydraulic cylinder and moves a linking fork connected to the clutch member back and forth.

Description

[0001] The present invention relates to a tractor differential lock,

[0001] The present invention relates to a differential locking device for a tractor, and more particularly, to a differential locking device for a tractor, and more particularly to a differential lock device for a tractor, Locking device.

The tractor is provided with a differential device in consideration of the running situation, for example, such a differential device is required depending on road conditions or working conditions even when the tractor is turning or traveling straight. However, depending on the circumstances, it is necessary to control such a differential device so that it does not operate. For example, the differential device may be operated so that only one wheel is idling repeatedly.

In this case, it is desirable to lock the differential device so that the same number of revolutions is applied to the output shaft on both sides, which is referred to as a differential lock. A conventional technique for such a differential locking device is disclosed in Japanese Patent Publication No. 6-257647, published by Kabushiki Kaisha of Japan. The differential lock device disclosed in this prior art can be said to be installed substantially on the rear axle. First, such a structure will be described.

A representative configuration of this prior art is shown in Fig. As can be seen from the above description, the rotational speed transmitted through the differential gear (crown gear) 3 is determined by taking the load (resistance) applied to the left and right wheels through the differential device D into consideration, To the output shaft (8) at a different rotational speed. Here, the driving principle of the differential device D itself has been known for a long time and a detailed description thereof will be omitted.

According to the differential lock device 11 provided in this prior art, the lock hole 12 is formed on the back surface of the side gear 7 on one side, and the lock pin 13 is detachably attached to the lock hole 12 The differential lock shifter 14 is coupled to the boss portion of the differential case 4 so as to be movable in the axial direction. A shift rod 15 is mounted on the transmission case 1 of the prior art. A hydraulic actuator 20 is mounted on the shift rod 15. The hydraulic actuator 20 can operate the shift fork 16 in the lateral direction.

Cylinders 18 and 19 are axially fixed to the upper portion of the shift rod 15 on the left and right sides of the boss portion 17 of the shift fork 16 to constitute a hydraulic cylinder 20 (actuator). When the differential lock pedal (not shown) is depressed, the solenoid valve is turned on / off so that the supply of hydraulic pressure to the hydraulic pressure portion 20L in the differential lock direction and the hydraulic pressure portion 20R in the unlocking direction can be switched.

Therefore, when hydraulic pressure is applied to the hydraulic pressure section 20L, the shift fork 16 moves in the direction of the arrow L as a guide and is stored in the return spring 21 to move the shifter 14 in the same direction And the lock pin 13 is inserted into the lock hole 12 to control the differential lock state. In order to release the differential lock device, that is, to operate the differential device, when the hydraulic pressure is applied to the hydraulic pressure portion 20R, movement in the direction opposite to the arrow L is caused to release the differential lock device.

However, according to the conventional technique, it is understood that the differential lock device has a complicated structure for operating the differential lock device. It is necessary to provide the shift rod 15 in the transmission case 1 and to control the shift fork 16 to move in a desired direction by using the hydraulic actuator 20 but be guided by the shift rod 15 Which is a complex structure.

As described above, although the differential lock device is described as an example in which the differential lock device is implemented on the rear axle, the lock device provided on the train axle can also be said to have substantially the same principle, and the above- .

It is an object of the present invention to provide a differential lock that is as efficient as possible from the viewpoints of cost, productivity, maintenance, and the like, by having a structure as simple as possible.

It is another object of the present invention to provide a differential lock device capable of maximizing the compatibility of parts and the productivity and convenience in the manufacturing process by minimizing the change of the components constituting the currently applied differential device, .

It is still another object of the present invention to provide a differential lock capable of minimizing the number of components and increasing the reliability of operation by maximizing the number of components by implementing a locking device using an axle housing in which a differential device is incorporated.

According to the present invention, there is provided a differential lock device for a tractor, comprising: an axle housing; a differential device installed inside the axle housing; and a pair of output shafts connected to right and left sides of the differential device; A clutch portion formed at an outer end of the first differential casing of the differential device; A clutch member having an outer portion of the first differential casing, a clutch portion spline-coupled to the first output shaft to be movable in an axial direction, and a clutch portion engageable with the clutch portion; And driving means provided in the axle housing for coupling or disengaging the clutch portion of the clutch member to or from the clutch portion of the first differential casing.

According to this embodiment of the driving means, the hydraulic cylinder mounted on the axle housing, the piston linearly moving in the lateral direction by the hydraulic pressure of the hydraulic cylinder, and the interlocking fork connecting the piston and the clutch member have.

According to another embodiment of the drive means of the present invention, there is provided a hydraulic system comprising a hydraulic cylinder installed in an axle housing, a piston linearly moving in a direction in which the clutch portions are engaged by the hydraulic pressure of the hydraulic cylinder, A spring for applying an elastic force to the piston in a direction in which the piston and the clutch member are separated from each other, and an interlocking fork connecting the piston and the clutch member.

It is preferable that the clutch portions in the present invention are constituted by a dog clutch.

According to another embodiment of the present invention, there is provided a differential lock device for a tractor, comprising: an axle housing; a differential device installed inside the axle housing; and a pair of output shafts connected to the right and left sides of the differential device; A clutch portion formed at an outer end of the first differential casing of the differential device; A clutch member having an outer portion of the first differential casing, a clutch portion spline-coupled to the first output shaft to be movable in an axial direction, and a clutch portion engageable with the clutch portion; A radially extending interlocking fork operatively associated with said clutch member (80); And linear motion means provided in the axle housing for rectilinearly moving the clutch portion of the clutch member in a direction to engage or disengage the clutch portion of the first differential casing.

According to the present invention having the above-described configuration, it can be seen that the operation to the locked state can be performed very easily, for example, by using the hydraulic device so that the differential device does not operate. It should be understood that the hydraulic device for rotating the interlocking fork and the interlocking fork in the present invention can be simply installed in the axle housing, and it is understood that a differential lock device having a simple structure as a whole can be provided by this configuration .

As such, the overall structure can be expected to have various advantages by virtue of the reduction in the number of components and to improve the productivity in the assembling process. It can also be said that the structure is simple, which means that it has sufficient reliability in actual operation.

1 is an exemplary sectional view showing an example of a conventional differential lock device;
2 is an exemplary sectional view showing a configuration of a differential lock apparatus according to the present invention;

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. In the following description of the present invention, a detailed description of the driving principle and operation of the already known and widely used differential apparatus itself will be omitted.

As shown in Fig. 2, in the interior of the axle housing 30 of the tractor, a differential device 40 for distributing power to the left and right wheels is provided. This differential device 40 is said to output the power transmitted through the ring gear 54, which may be the input shaft of the differential device, in the right and left direction at an appropriate number of revolutions in response to the state of the left and right wheels . The output from the differential device 40 is transmitted to the first output shaft 52L and the first output shaft 52R connected to the left and right wheels.

The differential device 40 includes a pair of side gears 42L and 42R (hereinafter collectively referred to as " 42 ") spline coupled to the output shafts 52L and 52R, And a plurality of pinion gears 46L and 46R (hereinafter also collectively referred to as " 46 ") meshing with the pinions 42L and 42R, respectively. The pinion gears 46L and 46R are provided at the ends of the pinion shaft 45 arranged in a cross shape.

A pair of differential casings 44L and 44R (hereinafter collectively referred to as " 44 ") are provided on the outer side of the side gear 42. The differential casing 44L, (Locking pins), so that they always rotate together. The rotation of the differential casing 44 substantially rotates the pinion shaft 45 as well.

The ring gear 54 interlocks with one differential casing 44R. For example, the inner surface of the ring gear 54 and the outer surface of the differential casing 44R are spline-coupled. The rotation of the differential casing 44R on one side causes the differential casing 44L and the pinion shaft 45 on the other side to rotate together and the pinion gear 46 is also revolved. The revolution of the pinion gear 46 causes the side gear 42 to rotate as the pinion gear 46 rotates. By the rotation of the side gear 42, the pair of output shafts 52 also rotate.

The distribution of the number of revolutions of the output shaft 52 is distributed according to the principle of the differential device 40 in accordance with the resistance applied to the output shafts 52L and 52R. When the operation of the differential device 40 is not required, the locking device according to the present invention operates so that the left and right output shafts 52L and 52R rotate at the same speed.

The differential lock device according to the present invention installed in such a differential device includes a hydraulic cylinder 60 installed in the axle housing 30 and a piston reciprocating linearly inward by the oil flowing into and out of the hydraulic cylinder 60. [ (62), and a spring (64) for pressing the piston (62) in a direction opposite to the force by the oil.

The piston (62) is moved to the right side of the drawing by the hydraulic pressure inputted through the hydraulic inlet (Pin), and the spring (64) exerts an elastic force when the hydraulic pressure is removed to move the piston . The piston (62) is connected to the interlocking fork (70), so that the piston (62) can reciprocate for a predetermined interval like the piston (62).

 This interlocking fork 70 extends radially outwardly of the hydraulic cylinder 60 and is connected to the clutch 80 as well. For example, the outer end of the interlocking fork 70 is constituted by two fork portions 72 having the same shape as two branches. The fork portion 72 is formed in the outer surface of the coupling 80 84, respectively. Therefore, the left and right movement of the piston 62 is transmitted to the clutch 80 through the interlocking fork 70 and moves left and right in the same direction.

It can be seen that the interlocking fork 70 substantially operates as an interlocking means for interlocking the piston 62 and the clutch 80 in the hydraulic cylinder 60 with each other. Since the clutch member 80 is spline-coupled to the first output shaft 52L, it can not move in the radial direction but is movably supported in the axial direction. A dog clutch portion 82 is formed at the right end portion of the clutch member 80. The clutch portion 82 of this clutch member 80 can be engaged with or disengaged from the clutch portion 44C molded at the left end of the first differential casing 44L.

That is, it can be seen that the clutch portion 82 and the clutch portion 44C form one clutch that can be engaged or disengaged from each other. It can be said that such a clutch is preferably composed substantially of a dog clutch. Therefore, the clutch portion 82 of the clutch member 80 and the clutch portion 44C of the first casing 44L constitute the dog clutch DC, and when they are connected to each other, It will be in an open state where power transmission is impossible.

Here, it can be said that the dog clutch DC is widely used itself because a plurality of jaws that can be engaged with each other are engaged or disengaged by the formed flanges, so that the power is interrupted. The engagement of the clutch portion 82 of the clutch member 80 and the clutch portion 44C of the first differential casing 44L is effected by the interlocking fork 70 connected to the piston 62 as described above.

The clutch portion 82 of the clutch member 80 is separated from the clutch portion 44C of the first differential casing 44L by the resilient restoring force of the spring 64. [ That is, the spring 64 inside the hydraulic cylinder 60 is built in such that it can apply a restoring force to the piston 62 in the opposite direction in which the hydraulic pressure acts.

Therefore, when the force due to the hydraulic pressure pushing the interlocking fork 70 to the right is removed, the interlocking fork 70 is moved to the left in the drawing due to the elastic restoring force of the spring 64. When the interlocking fork 70 is moved to the left as described above, the clutch member 80 also moves in the same direction, so that the first differential casing 44L and the clutch member 80 are separated from each other. This state substantially means the open state of the dog clutch DC, which means that the differential device 40 operates normally.

Hereinafter, the operation of the differential lock apparatus according to the present invention will be described. First, as described above, in a state in which the clutch member 80 moves to the left side in the drawing due to the elastic restoring force of the spring 64 and is spaced apart from the first differential casing 44L, the differential device 40 is normally operating State. In the case where the operation of the differential device is not necessary and the vehicle should be locked during the normal operation of the differential device, by operating a button or a switch provided on the tractor, for example, in the vicinity of the driver's seat, 60 through the inlet (Pin).

By this switch operation of the driver, when the hydraulic pressure is supplied from the separate hydraulic device into the hydraulic cylinder 60, the piston 62 moves to the right in the figure. By the operation of the piston 62, the interlocking fork 70 also moves to the right side in the same direction, and the clutch member 80 is also moved to the right side.

When the clutch member 80 is pushed to the right side, the clutch portion 82 is engaged with the clutch portion 44C of the first differential casing 44L. When combined, the first output shaft 52L and the second output shaft 52R substantially rotate at a constant speed. That is, since the clutch member 80 and the first side gear 42L are spline-coupled to the first output shaft 52L, they rotate at the same speed. Thus, the first differential casing 44L and the second differential casing 44R and the pinion shaft 45 also have the same number of revolutions, the first output shaft and the second output shaft substantially have the same number of revolutions. This rotational speed can be said to occur by virtually not operating the differential.

When the locking state of the differential device becomes unnecessary, the supply of the hydraulic pressure to the inside of the hydraulic cylinder 60 is interrupted by the operation of the switch, the button or the pedal as described above, And is moved to the left by the resilient restoring force of the spring 64. The left movement of the piston 62 causes the clutch member 80 to be separated from the first differential casing 44L. Such a state is a state in which the differential device 40 can be normally operated, and the left and right wheels will be able to rotate with the required number of revolutions according to the running state.

Hereinafter, another embodiment of the present invention will be described. In the above-described embodiment, the pistons in the hydraulic cylinder 60 are configured to move in different directions by the force of the hydraulic pressure and the spring. However, it is of course possible to configure the piston 62 in the hydraulic cylinder so that it can move laterally in the hydraulic cylinder 60 by hydraulic pressure. In this case, the configuration for supplying and discharging the hydraulic pressure becomes somewhat complicated. However, it is also possible to configure the piston to move in both directions by supplying and discharging the hydraulic pressure in the hydraulic cylinder.

As described above, according to the present invention, it is a basic technical concept that the clutch 80 is interlocked by moving the interlocking fork using a hydraulic device or other mechanical device that can be simply installed in the axle housing Able to know. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

30 ..... Axle housing
40 ..... Differential
42, 42L, 42R ..... side gear
44, 44L, 44R ..... differential casing
45 ..... Pinion shaft
46, 46L, 46R ..... pinion gear
52, 52L, 52R ..... Output shaft
60 ..... Hydraulic cylinder
62 ..... piston
64 ..... spring
70 ..... interlocking fork

Claims (5)

A differential lock device for a tractor, comprising: an axle housing; a differential device installed in the axle housing; and a pair of output shafts (52) connected to the right and left sides of the differential device;
A clutch portion (44C) formed at an outer end of the first differential casing of the differential device;
A clutch member (80) having a clutch portion (82) that can be coupled to the clutch portion (44C), and a clutch member (80) that is spline-coupled to the first output shaft and movable in the axial direction, ; And
And driving means provided in the axle housing for engaging or disengaging the clutch portion (82) of the clutch member (80) with the clutch portion (44C) of the first differential casing.
2. The hydraulic excavator according to claim 1, wherein the drive means comprises: a hydraulic cylinder provided in the axle housing; a piston linearly moving in the left-right direction by the hydraulic pressure of the hydraulic cylinder; and an interlocking fork connecting the piston and the clutch member Differential lock.
2. The hydraulic control apparatus according to claim 1, wherein the driving means includes: a hydraulic cylinder installed in the axle housing; a piston linearly moving in a direction in which the clutch portions are engaged by the hydraulic pressure of the hydraulic cylinder; A spring for applying an elastic force to the piston in a direction in which the piston and the clutch member are engaged with each other, and an interlocking fork connecting the piston and the clutch member.
4. The differential lock apparatus of any one of claims 1 to 3, wherein the clutch portions comprise a dog clutch.
A differential lock device for a tractor, comprising: an axle housing; a differential device installed in the axle housing; and a pair of output shafts (52) connected to the right and left sides of the differential device;
A clutch portion (44C) formed at an outer end of the first differential casing of the differential device;
A clutch member (80) having a clutch portion (82) that can be coupled to the clutch portion (44C), and a clutch member (80) that is spline-coupled to the first output shaft and movable in the axial direction, ;
A radially extending interlocking fork operatively associated with said clutch member (80); And
And a linear motion means provided in the axle housing for rectilinearly moving the clutch portion of the clutch member in a direction to engage or disengage the clutch portion of the first differential casing, lock.








KR1020150081174A 2015-06-09 2015-06-09 Locking device for differential for tractor KR101709399B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150081174A KR101709399B1 (en) 2015-06-09 2015-06-09 Locking device for differential for tractor

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Application Number Priority Date Filing Date Title
KR1020150081174A KR101709399B1 (en) 2015-06-09 2015-06-09 Locking device for differential for tractor

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KR20160145224A true KR20160145224A (en) 2016-12-20
KR101709399B1 KR101709399B1 (en) 2017-02-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230027752A (en) * 2021-08-20 2023-02-28 현대트랜시스 주식회사 Disconnecter
KR20230030857A (en) * 2021-08-26 2023-03-07 현대트랜시스 주식회사 Axle assembly of electric vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10148250A (en) * 1996-11-20 1998-06-02 Tochigi Fuji Ind Co Ltd Differential gear
KR100642597B1 (en) * 2005-08-24 2006-11-10 다이모스(주) Differential locking system of a vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10148250A (en) * 1996-11-20 1998-06-02 Tochigi Fuji Ind Co Ltd Differential gear
KR100642597B1 (en) * 2005-08-24 2006-11-10 다이모스(주) Differential locking system of a vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230027752A (en) * 2021-08-20 2023-02-28 현대트랜시스 주식회사 Disconnecter
KR20230030857A (en) * 2021-08-26 2023-03-07 현대트랜시스 주식회사 Axle assembly of electric vehicle

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