KR102032906B1 - Shuttle clutch with lock up clutch of Shuttle transmission for agriculture vehicle - Google Patents

Shuttle clutch with lock up clutch of Shuttle transmission for agriculture vehicle Download PDF

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Publication number
KR102032906B1
KR102032906B1 KR1020120149525A KR20120149525A KR102032906B1 KR 102032906 B1 KR102032906 B1 KR 102032906B1 KR 1020120149525 A KR1020120149525 A KR 1020120149525A KR 20120149525 A KR20120149525 A KR 20120149525A KR 102032906 B1 KR102032906 B1 KR 102032906B1
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KR
South Korea
Prior art keywords
clutch
lock
piston
shuttle
transmission
Prior art date
Application number
KR1020120149525A
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Korean (ko)
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KR20140080092A (en
Inventor
이영규
박동욱
Original Assignee
대동공업주식회사
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Priority to KR1020120149525A priority Critical patent/KR102032906B1/en
Publication of KR20140080092A publication Critical patent/KR20140080092A/en
Application granted granted Critical
Publication of KR102032906B1 publication Critical patent/KR102032906B1/en

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    • 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
    • F16H—GEARING
    • F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
    • F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
    • 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
    • F16D25/00—Fluid-actuated clutches
    • F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
    • F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
    • F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
    • F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
    • F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
    • 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
    • F16H—GEARING
    • F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
    • F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
    • F16H2045/0215—Details of oil circulation

Abstract

A shuttle clutch of a farm truck shuttle transmission having a lock up clutch is disclosed. Hydraulic multi-plate clutch according to the present invention, the clutch retainer is integrally rotatably coupled to the shaft, left and right slidingly coupled to the clutch retainer is located between the plurality of clutch plate, clutch plate that is integrally rotated while being connected / spaced A plurality of clutch discs for transmitting power to the driven clutch hub, a clutch piston operated by hydraulic pressure and intermittent to connect the clutch plate to the clutch disc, a return spring providing elasticity for returning the clutch piston to its original position; The present invention is intended to include a lockup clutch which is operated by hydraulic pressure and directly connects the clutch retainer and the clutch hub so as to be capable of power transmission.

Description

Shuttle clutch with lock up clutch of Shuttle transmission for agriculture vehicle

The present invention relates to a shuttle clutch that is applied to a shuttle transmission of an agricultural work machine such as a tractor, and more particularly, a farm work vehicle shuttle transmission having a lock-up clutch for preventing slip occurrence of a power connection system under load operation or working conditions. Relates to a shuttle clutch.

Agricultural work trucks, such as tractors, which are mainly used for tillage, are frequently shifted from low speed to high speed or from high speed to low speed due to their working characteristics, and also frequently shift in the moving direction from forward to backward or backward to forward. Therefore, a shuttle transmission device is adopted to convert the power output from the engine into power having a speed and direction suitable for the work.

Conventional agricultural trucks generally have a synchronizing clutch to a shuttle shaft that is electrically connected to an engine output shaft, and a gear that alternatively engages with the shuttle gear on the shuttle shaft by the operation of the clutch. A mechanical mechanical shuttle transmission including a reverse gear and in which the clutch regulates the power connection in conjunction with a shifting operation of the shift lever has been adopted.

However, there is a problem that the shuttle transmission of the mechanical structure has a large volume, which makes it difficult to secure space, a noise is large due to the connection between gears during the shift, and in particular, the operation is inconvenient because the shift is entirely performed by the driver's operation. Therefore, in recent years, as in automobiles, hydraulic shuttle transmissions (also called 'power shuttles') are implemented in which a shift is realized without a great force by assisting the shift by hydraulic pressure like a car.

1 is a schematic cross-sectional view schematically showing the internal configuration of a conventional shuttle transmission for agricultural work vehicles having a configuration in which shifting is performed by hydraulic pressure. With reference to this it will be briefly described for the conventional hydraulic shuttle transmission configuration.

Referring to FIG. 1, the conventional hydraulic shuttle transmission includes a power output shaft 100 connected to an engine output shaft, a transmission shaft 200 parallel to the power output shaft 100, and a traveling output shaft 300 freely rotatable on the power output shaft. ). On the power take-off shaft 100, a pair of left and right shuttle clutches 400 for performing a vehicle forward / reverse operation are provided, and a pair of left and right shift clutches 500 for shifting a traveling speed on a shift shaft are provided. ) Is provided.

The shuttle clutch 400 and the shift clutch 500 have a configuration of a hydraulic multi-plate clutch that operates by hydraulic pressure to selectively allow or block the power connection to the driven side, and the forward / reverse inside each shaft where the clutch is installed. In addition, the internal flow paths 102 and 202 which form a path through which pressure oil can be delivered to each clutch on the high speed / low speed side are configured to be elongated along the longitudinal direction of the corresponding shaft.

Reference numerals 104 and 204 are hydraulic ports to which the hydraulic lines are connected to introduce the hydraulic oil into the power take-off shaft 100 and the internal shaft of the transmission shaft 200.

The conventional hydraulic shuttle transmission as described above has the advantage that the hydraulic assist the shifting and thus the selective power connection is implemented, compared to the above-described mechanical quietness, ease of operation, shifting accuracy. However, the conventional hydraulic shuttle transmission is in the case of a load operation in which a considerable load is applied to the axle (or power take-off shaft) such as a rough road or a wet operation, the power transmission rate is reduced due to slip, which lowers the driving efficiency and work quality. There is a disadvantage.

Japanese Patent Publication No. 2002-257202

The problem to be solved by the present invention is to prevent the occurrence of slip in the load operation in which a significant load is applied to the axle or the power take-off shaft, such as rough roads or wet work of an agricultural work truck such as a tractor, and thus the load This is to prevent deterioration of driving efficiency and work quality during driving.

As a solution to the problem, the present invention, the clutch retainer is rotatably coupled to the shaft; A plurality of clutch plates coupled to the clutch retainer so as to be left and right slideable and integrally rotated; A plurality of clutch discs positioned between the clutch plates to transmit power to the driven clutch hub while being connected / spaced; A clutch piston operating by hydraulic pressure and regulating the connection of the clutch plate to the clutch disk; A return spring providing resilience to return the clutch piston to its original position; And a lock-up clutch operated by hydraulic pressure and directly connected to the clutch retainer and the clutch hub to enable power transmission. The shuttle clutch of the agricultural work vehicle shuttle transmission comprising the lock-up clutch is provided.

In the present invention, the lock-up clutch may be configured to be integrally rotatably coupled to the clutch piston, the clutch piston is connected to the shaft and the oil pressure passage for forming a path for introducing the hydraulic oil for the lock-up clutch operation of the clutch piston It can be formed radially.

Preferably, the lock-up clutch comprises: a lock-up clutch piston rotatably coupled to the clutch piston and operatively connected to the clutch hub so as to be capable of power transmission with the clutch hub; And a lockup return spring that provides a restoring force for separating the lockup clutch piston from the clutch hub.

At this time, the lock-up clutch piston, the piston body having an outer diameter surface which is in close contact with the inner diameter surface of the clutch piston may be a configuration in which the engaging portion protruding in the direction of the clutch hub is integrally formed, the engaging portion is capable of always power transmission with the clutch piston. It may be a dog gear that forms an engagement surface that selectively engages with the engagement surface of the interlocking spline and clutch hub end.

According to the shuttle clutch of the agricultural work vehicle shuttle transmission according to an embodiment of the present invention, by adopting a lock up clutch operable by the driver selection operation, a reliable power connection without the occurrence of slip in the load operation situation Can be implemented. That is, even in a load driving situation in which a significant load is generated on the axle or power take-off shaft, such as a rough road or a wet field work, the constant speed driving and the constant speed work are guaranteed, so that the driving efficiency and the work quality can be expected to be improved.

1 is a schematic configuration diagram of a conventional agricultural work vehicle shuttle transmission.
Figure 2 is a schematic configuration diagram schematically showing the overall configuration of the agricultural transmission vehicle shuttle transmission employing the shuttle clutch according to the present invention.
3 is an enlarged view of the main portion of the shuttle transmission shown in FIG.
4 is a perspective view of the shuttle clutch cutaway shown in FIG.
5 and 6 are a cross-sectional view and a cut-away view of the operating state of the shuttle clutch, the lock-up function is executed by the lock-up clutch.
Figure 7 is a cross-sectional view of the operating state of the shuttle clutch release lockup function.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, a detailed description of known configurations will be omitted, and a detailed description thereof will be omitted for configurations that may unnecessarily obscure the subject matter of the present invention.

2 is a schematic configuration diagram of a farm vehicle shuttle transmission to which the hydraulic multi-plate clutch according to the present invention is applied. With reference to this, the overall configuration of the agricultural work vehicle shuttle transmission to which the hydraulic multi-plate clutch according to the present invention will be described first.

Referring to FIG. 2, the agricultural work vehicle shuttle transmission rotates on a power take-off shaft 1 connected to an engine output shaft, a shift shaft 2 arranged in parallel with the power take-off shaft 1, and a power take-off shaft. And a travel output shaft 3 fitted freely. The power take-off shaft 1 is provided with a pair of left and right shuttle clutches 4 related to the forward / reverse of the vehicle, and the shift shaft 2 has a pair of left and right shift clutches 5 related to the traveling speed shift. Is provided.

The shuttle clutch 4 and the shift clutch 5 have a configuration of a hydraulic multi-plate clutch that is operated by hydraulic pressure to selectively allow or block power connection with the driven side, and the traveling output shaft provided with these clutches 4 and 5 is provided. Inside the gear shaft (3) and the shifting shaft (2) there are internal flow passages (12) and (22) forming a path through which the hydraulic oil can be transferred to the clutches (4) (5) on the forward / reverse and high speed / low speed sides. It extends long along a longitudinal direction.

The power take-off shaft 1 is selectively connected to the flywheel 7 which outputs the engine power via the main clutch 6 so as to be capable of power connection, and selectively rotates by the engine output, and the main clutch 6 is connected. The power transmitted to the power take-off shaft 1 is transmitted to the work machine, for example, a rotary, which is selectively connected to the agricultural work vehicle, for example, the tractor rear, through the power take-off shaft 1, and thus the work machine is driven together with the vehicle driving so that a predetermined Work is possible.

The driving power for driving the agricultural work vehicle is a rotational power output to the traveling output shaft 3 via the shifting shaft 2 and the shifting clutch 5 on the shifting shaft 2 through the shuttle clutch 4, A lockup clutch 8 is provided in the shuttle clutch 4 having a hydraulic multi-plate clutch configuration in order to prevent slip generation due to load during power connection. A hydraulic multi-plate clutch configuration having a lockup clutch will now be described with reference to FIG. 3.

3 is an enlarged sectional view of a main portion of the shuttle transmission shown in FIG. 2, which is an enlarged cross-sectional view of the shuttle clutch according to the present invention, and FIG. 4 is a cutaway perspective view of the shuttle clutch shown in FIG. 3.

3 to 4, the shuttle clutch 4 having the lock-up clutch 8 is based on a hydraulic multi-plate clutch configuration in which a plurality of friction plates are in close contact with each other by hydraulic pressure to realize power connection. . Specifically, a clutch retainer 40, a plurality of clutch plates 41, a plurality of clutch disks 42, a clutch piston 44, a return spring 45, and the lockup clutch 8 are configured.

The clutch retainer 40 is splined to be integrally rotatable to the shaft (power take-off shaft), and the clutch plate 41 is provided with a compression spring S on a slide bar (not shown) of the clutch retainer 40. Each of them is coupled to the left and right so as to be slidable and rotates integrally with the clutch retainer 40. And the clutch disc 42 is installed on the outer edge of the clutch hub 43 which is the driven shaft at an interval that can be located between the clutch plate 41.

Accordingly, the clutch plate 41 is pressed by the sliding movement of the clutch piston 44, and the clutch plate 41 is slid in the direction in which the pressing force is applied by the pressing, and the surface contact with each of the neighboring clutch disks 42 is performed. When this is achieved, the rotational power of the clutch retainer 40 by the shaft rotation is transmitted to the clutch hub 43 which is the driven shaft.

The clutch piston 44 is installed to reciprocate left and right in a cylinder space partitioned into the clutch retainer 40. Specifically, the hydraulic force is generated to generate an operating force for bringing the clutch plate 41 on the clutch retainer 40 into close contact with the clutch disc 42. As a result, the force to close the clutch plate 41 toward the clutch disc 42 is removed and the connection state of the power is released.

The return spring 45, which generates a restoring force for returning the clutch piston 44 to its original position, is fitted to a spring guide 48 supported by a stopper 47 on the clutch retainer 40 to achieve stable compression and restoration without bending. The lock-up clutch 8, which is applied to prevent slip occurrence, reciprocates independently of the sliding direction reciprocation of the clutch piston 44 in the cylinder space partitioned inside the clutch piston 44.

The lockup clutch 8 functions by pressurized oil while rotating together with the clutch piston 44 to directly connect the clutch retainer 40 and the clutch hub 43 so as to enable power transmission. To this end, the lock-up clutch 8 is splined rotatably integrally with the clutch piston 44 installed in the clutch retainer 40 and in the same direction as the sliding direction of the clutch piston 44 by hydraulic pressure. It is provided in the clutch piston 44 to reciprocate.

The hydraulic oil for operating the lockup clutch 8 in the clutch piston 44 is formed in the clutch piston 44 in the radial direction of the clutch piston 44 and can communicate with the internal flow path on the shaft (power take-off shaft). It is provided through the hydraulic passage 46 is connected.

That is, the lock-up clutch 8 and the clutch hub 43, and the clutch retainer 40, by the sliding movement of the lock-up clutch 8 by the pressure oil provided through the inner passage 12 and the pressure oil passage 46. And the clutch hub 43 are directly connected to allow power transmission.

Specifically, the lock-up clutch 8 has a lock-up clutch piston 80 which is rotatably splined integrally with the clutch piston 44 and operated by pressure oil to be directly connected to the clutch hub 43 so as to be capable of power transmission. It is composed of a lock-up return spring 84 that generates a restoring force for releasing the power connection state by separating the lock-up clutch piston 80 from the clutch hub 43 when exiting.

Reference numeral 86 is a stopper for elastically supporting the lock-up return spring 84 in the clutch piston 44.

A preferred configuration of the lock-up clutch piston 80 is an engaging portion projecting in the direction of the clutch hub 43 to the piston body 80a having an outer diameter surface intimately connected to the inner diameter surface of the clutch piston 44, as shown in the figure. 80b) may be integrally formed.

At this time, the engaging portion 80b is the spline 82 and the clutch hub 43 which are always engaged with the spline 44-1 formed on the outer diameter surface of the spring stop 44-2 of the clutch piston 44 so as to be able to transmit power. It may be a dog gear having a configuration in which the engagement surface 81 selectively engages with the engagement surface 49 at the end thereof.

In the figure, reference numeral B denotes a bearing installed for free rotation of the clutch hub 43 with respect to the shaft (power take-off shaft), and H denotes a lubricating oil hole through which lubricating oil passes.

The connection and disconnection process of the power performed by the shuttle clutch of the shuttle transmission according to the embodiment of the present invention having the above configuration will be briefly described in connection with the operation of the shuttle clutch.

5 and 6 show the clutch plate 41 and the clutch disc 42 being in close contact with each other by the operation of the clutch piston 44, and in the clutch connected state capable of power transmission from the driving side (clutch retainer) to the driven side (clutch hub). The operation state diagram showing that the lock-up function for preventing slip is executed by the operation of the lock-up clutch 8 described above.

In the state where the club teeth are connected to the clutch hub 43 in the clutch retainer 40 as shown in FIGS. 5 to 6, the hydraulic oil is operated to shift the internal flow path and the hydraulic flow path 46 by a shift operation of the driver. When introduced into the lock-up clutch cylinder (not shown) partitioned by the lock-up clutch piston 80 and the clutch piston 44, the lock-up clutch piston 80 moves toward the clutch hub 43 and the lock-up clutch piston 80 The engagement surface 49 and the engagement surface 81 at the end of the clutch hub 43 are engaged with each other.

As described above, in the state where the lock-up clutch piston 80 and the clutch hub 43 are engaged with each other, the driving side (clutch retainer 40) is provided through a plurality of clutch plates 41 and the clutch disk 42 in which power is closely connected to each other. Although it is transmitted to the driven side (clutch hub 43) in, but the slip transmission to the clutch hub 43 is realized through the lock-up clutch piston 80, so that the axle or power take-off shaft, such as hum road or wet operation Even if a heavy load occurs, no power loss occurs.

FIG. 7 is an operation state diagram showing that the lockup function is released by the driver's operation in the locked up state as opposed to the execution of the lockup function described above. When the introduced hydraulic oil exits the lock-up clutch 8 cylinder (not shown), the lock-up clutch piston 80 is moved by the lock-up return spring 84 in a direction away from the clutch hub 43 to lock up. ) Is released.

According to the embodiment of the present invention described above, by adopting a lock up clutch (operable by the driver selection operation), it is possible to implement a reliable power connection without the occurrence of slip in the load operation situation. That is, even in a load driving situation in which a significant load is generated on the axle or power take-off shaft such as a rough road or a wet field work, the constant speed driving and the constant speed work are guaranteed, and thus, the driving efficiency and the work quality can be improved.

In the detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

1: power take-off shaft 2: shifting shaft
3: shuttle shaft 4: shift clutch
5: shuttle clutch 6: main clutch
7: flywheel 8: lock-up clutch
12, 22: internal flow path
40: clutch retainer 41: clutch plate
42: clutch disc 43: clutch hub
44: clutch piston 45: return spring
46: hydraulic oil passage 47, 86: stopper
48: spring guide 80: lock-up clutch piston
80a: piston body 80b: engagement portion
82: spline 49, 81: engagement surface

Claims (6)

A clutch retainer integrally rotatably coupled to the shaft;
A plurality of clutch plates coupled to the clutch retainer so as to be left and right slideable and integrally rotated;
A plurality of clutch discs positioned between the clutch plates to transmit power to the clutch hub while being connected / spaced;
A clutch piston operating by hydraulic pressure and regulating the connection of the clutch plate to the clutch disk;
A return spring providing resilience to return the clutch piston to its original position;
A lock-up clutch which is operated by hydraulic pressure and directly connects the clutch retainer and the clutch hub to a power transmission; And
And a spring guide supported by the stopper of the clutch retainer and guiding stable compression and restoration without deflection of the return spring.
The lockup clutch,
A lock-up clutch piston integrally rotatably coupled to the clutch piston and operated by pressure oil to be connected to the clutch hub so as to transmit power;
Shuttle of the agricultural work machine shuttle transmission with a lock-up clutch, characterized in that the lock-up clutch interposed between the lock-up clutch piston and the stopper of the inner peripheral surface of the clutch piston to provide a restoring force for separating the lock-up clutch piston from the clutch hub. clutch.
delete The method of claim 1,
The clutch piston of the agricultural work vehicle shuttle transmission having a lock up clutch is characterized in that the hydraulic passage is formed in the radial direction of the clutch piston in communication with the shaft and forming a path for introducing the hydraulic oil for the lock-up clutch operation. .
delete The method of claim 1,
The lock-up clutch piston,
A piston body having an outer diameter surface closely connected to the inner diameter surface of the clutch piston,
Shuttle clutch of an agricultural work vehicle shuttle transmission having a lock-up clutch, characterized in that the piston body is formed integrally formed in the clutch hub direction.
The method of claim 5,
The engagement portion is a farm work vehicle having a lock gear including a spline engaged with the clutch piston at all times for power transmission and an engagement surface for selectively engaging the power transmission surface with the engagement surface at the end of the clutch hub. Shuttle clutch on shuttle transmission.
KR1020120149525A 2012-12-20 2012-12-20 Shuttle clutch with lock up clutch of Shuttle transmission for agriculture vehicle KR102032906B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120149525A KR102032906B1 (en) 2012-12-20 2012-12-20 Shuttle clutch with lock up clutch of Shuttle transmission for agriculture vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120149525A KR102032906B1 (en) 2012-12-20 2012-12-20 Shuttle clutch with lock up clutch of Shuttle transmission for agriculture vehicle

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KR20140080092A KR20140080092A (en) 2014-06-30
KR102032906B1 true KR102032906B1 (en) 2019-10-16

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020170511A1 (en) * 2019-02-22 2020-08-27 ジヤトコ株式会社 Friction fastening device
KR102337224B1 (en) * 2020-02-12 2021-12-08 현대위아(주) Limited slip differential and its control method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006183855A (en) * 2004-12-03 2006-07-13 Yanmar Co Ltd Hydraulic clutch device and traveling system transmission structure

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Publication number Priority date Publication date Assignee Title
JP3756767B2 (en) 2001-02-27 2006-03-15 株式会社クボタ Shuttle device for traveling vehicle
JP5315375B2 (en) * 2011-03-29 2013-10-16 ジヤトコ株式会社 Multi-plate friction engagement mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006183855A (en) * 2004-12-03 2006-07-13 Yanmar Co Ltd Hydraulic clutch device and traveling system transmission structure

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