JP4805880B2 - Parking brake equipment - Google Patents

Description

  The present invention relates to an improvement of a parking brake device in which a braking friction plate is disposed in a transmission case.

As a parking brake device in which a braking friction plate is arranged in a transmission case, for example, a parking brake device having the following structure is conventionally known.
[1] One equipped with a braking device dedicated to parking, separate from a side clutch and a brake for turning braking, on one end side of a transmission shaft provided in a transmission case (see, for example, Patent Document 1).
[2] Equipped with a side clutch and a friction plate for turning braking on the branch transmission shaft provided in the transmission case, and the friction plate is used as a parking brake when the vehicle is stopped without turning braking. (For example, refer to Patent Document 2).

JP-A-11-314575 (paragraph [0031], FIG. 2, FIG. 3) JP 2000-185664 A (paragraph [0033], FIG. 4, FIG. 7)

When a braking device dedicated to parking is provided on a different shaft from the shaft provided with the side clutch and the brake for turning braking as in Patent Document 1, like a side clutch and a brake for turning braking, Since it is not necessary to separately act on the left and right traveling devices, it is advantageous in that it is easy to construct a structure that can simultaneously apply braking force to both the left and right traveling devices during parking.
However, in this structure, since the parking brake is also provided on the same axis as the various transmission mechanisms installed in the mission case, the case width of the transmission case increases by the width of the additional parking brake. There is a problem that it tends to.

As in Patent Document 2, on the branch transmission shaft where the side clutch and the friction brake for turning braking are arranged, the braking force is applied to the turning braking friction plate when the machine is stopped. In the structure, the friction plate for turning braking can be used as a parking brake, which is useful in that the structure can be made compact by sharing parts.
However, in this structure, since the braking action of the parking brake is given to only one side of the transmission system of the left and right traveling devices, the traveling device on the side that is not braked on an inclined ground or soft ground is displaced. Further, there is a risk of causing problems such as the body swinging left and right due to backlash in the transmission system of the traveling device on the side where no braking action is applied.
In order to avoid such a problem, it is only necessary to brake the branch transmission shaft itself. For this purpose, it is necessary to separately provide a dedicated parking brake on the same axis, which has the conventional structure described in Patent Document 1. There is a risk that the case width of the mission will increase to the same or higher level.

  An object of the present invention is to provide a parking brake device that can be arranged compactly in a mission case with a simple structure with a small number of parts.

[Solution 1]
In order to solve the above technical problem, the first solution means in the parking brake device of the present invention is that, as described in claim 1, a braking friction plate disposed in the transmission case is used as a transmission case. A parking brake operating shaft that can be operated from the outside, and a gear portion that meshes with a transmission gear is formed on a friction plate that is provided on the parking brake operating shaft. A braking operation mechanism that clamps the friction plate in accordance with a dynamic operation is provided.

[Action and effect]
As described above, in the parking brake device of the present invention according to the solution 1, the braking friction plate is supported on the parking brake operation shaft that can be operated from the outside of the transmission case, and from the outside with respect to the parking brake operation shaft. The friction plate is braked by pinching the friction plate with the turning operation. Therefore, the friction plate is supported by using the parking brake operation shaft necessary for operating the parking brake without using the transmission shaft provided with various transmission mechanisms as the shaft for supporting the friction plate. It becomes possible to do.
Thus, where the parking brake operation shaft for supporting the friction plate is arranged in the transmission case is not limited by the arrangement position of the various transmission shafts, and any position where the various transmission shafts are not arranged. This increases the degree of freedom in design.
As a result, it is possible to select a location where there is no possibility of increasing the case width of the transmission case, and to deploy the parking brake operation shaft. In addition, the parking brake operation shaft is located at a location before the transmission of the traveling system branches to the left and right. Can be provided so that the braking action at the time of parking acts on the left and right traveling systems.
The parking brake operating shaft is provided with a friction plate. Since the friction plate is formed with a gear portion that meshes with a transmission gear, the friction plate is used as a braking member during braking operation. And the friction plate also functions as a member for transmitting the braking force to the transmission system.
Therefore, compared with the case where the means for obtaining the friction function and the means for obtaining the braking force transmission function for transmitting the braking action by friction to the transmission system are configured separately, the friction plate has both functions. As a result, it is possible to obtain the effects of both simplification of the structure and reduction of the arrangement space by sharing the parts.

[Solution 2]
According to a second solution means of the parking brake device of the present invention, as described in claim 2, it is different from the branch transmission shaft provided with a side clutch for intermittently transmitting / receiving power transmitted to the pair of left and right traveling devices. There is a structural feature in that the parking brake operating shaft is constituted by the shaft.

[Action and effect]
In the parking brake device of the present invention according to the solving means 2 configured as described above, in addition to the same action and effect as the invention according to the solving means 1, the following action and effect are also exhibited.
That is, in the parking brake device of the present invention according to the solution 2, the parking brake operation shaft is configured as a separate shaft from the branching transmission shaft, and therefore the side clutch and the turning brake device are juxtaposed on one axis. Compared to the structure with a parking brake device at the shaft end of the branching transmission shaft, it is possible to make the case width at the branching transmission shaft part that tends to be wider in the axial direction of the transmission case. It becomes.
As a result, in addition to being able to reduce the case width at the location of the branch transmission shaft where the case width is likely to be the widest as a transmission case, the transmission structure is complicated and the space for incorporating braking means There is an advantage that the mission case can be configured without causing an increase in the size for securing in the mission case.

[Solution 3]
According to a third solving means of the parking brake device of the present invention, as described in claim 3, the parking brake operating shaft is arranged upstream of the branching transmission shaft in the power transmission direction. There are the above features.

[Action and effect]
In the parking brake device of the present invention according to the solving means 3 configured as described above, in addition to the same operational effects as the invention according to the solving means 1 or 2, the following operational effects are also exhibited.
In other words, the parking brake device is arranged upstream of the branch transmission shaft in the power transmission direction, so that a braking force is simultaneously applied to both the left and right traveling devices using a single parking brake device. Therefore, it is possible to simplify the structure as compared with a structure in which a braking action is applied to each of the left and right sides.
Since the braking force is applied at a location where the transmission torque is small on the upstream side in the transmission direction, the outer diameter of the friction plate can be configured with a small diameter with a relatively small contact area, and the device can be made compact. There is an advantage that it is easy to make.

[Solution 4]
According to a fourth solving means of the parking brake device of the present invention, as described in claim 4, the braking friction plate is a combination of a plurality of disk-like friction members in which a transmission gear portion is formed on the peripheral portion. And is configured to be braked by the pinching pressure between the plurality of fixed friction members.

[Action and effect]
The parking brake device according to the present invention according to the solving means 4 configured as described above has the following effects in addition to the same effects as the invention according to the solving means 1, 2, or 3.
In other words, the parking brake device of the present invention according to the solution means 4 is composed of a combination of a plurality of disk-shaped members having a transmission gear portion formed on the periphery thereof, and is braked by the pinching force between the plurality of fixed-side friction members. Therefore, the friction plate itself can be composed of a plurality of thin-walled members to ensure a required contact area while ensuring a required gear thickness as a transmission member. .
Accordingly, the outer diameter of the friction plate can be further reduced with a smaller diameter, and useful advantages can be obtained for downsizing the entire structure.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall configuration of work vehicle]
FIG. 1 shows a self-removing combine that is an example of a work vehicle to which a parking brake device of the present invention is applied. In this embodiment, there is provided a small combine having a relatively narrow body width having a pre-cutting device for cutting a small number of trimmings that causes two or three stalks to be cut and trimmed along with two trigger paths. Illustrated.

In the above self-detaching combine, the pre-cutting device 2 is disposed on the front side of the body frame 10 supported by the pair of left and right crawler traveling devices 1, 1 (traveling device), and is provided on the front side of the body frame 10. The control section 11 is provided with a cockpit 14 behind a control tower (not shown) standing on the front side of the control section floor.
On the rear side of the control unit 11, a threshing device 15 for inheriting the cereals conveyed from the pre-harvest pretreatment device 2 side and holding it with a feed chain 15a, and a threshing processed grain A drain tank processing device 17 for cutting the waste straw discharged from the threshing device 15 is disposed on the rear side.

[Composition of split case]
In this combine, a mission case 3 as an example of a split case is provided between the right and left crawler traveling devices 1 on the front side.
As shown in FIG. 2, the mission case 3 has a two-part structure of a right-side divided case unit 4 (shown on the left side in the figure) and a left-side divided case unit body 5 (shown on the right side in the figure). It is composed of a combination of both split case units 4 and 5.

  A part of the side wall 50 is formed in a recessed shape on the side of the mating surface 30 of the mission case 3 on the left divided case unit body 5 side in the mission case 3, and the HST case wall 60 is formed by this recessed portion. A hydrostatic continuously variable transmission 6 is housed in a space formed by the HST case wall 60 portion. The open side of the recessed HST case wall 60 is closed by a valve plate 51.

  As shown in FIG. 2, the continuously variable transmission 6 includes a variable displacement hydraulic pump 61 and a hydraulic motor 62. The continuously variable transmission 6 has a neutral stop position, and is configured to be continuously variable to the high speed side of forward movement and the high speed side of reverse movement.

  An input shaft 19 for inputting engine (not shown) power to the hydraulic pump 61 of the continuously variable transmission 6 projects rightward from the divided case unit 4 on the right side of the transmission case 3, and enters the input shaft 19. An input pulley 19a and a cooling fan 19b are fixed. The power from the engine (not shown) is continuously variable via an output pulley (not shown) and a transmission belt (not shown) wound around the input pulley 19a of the input shaft 19. It is configured to be transmitted to the device 6.

As shown in FIG. 2, the transmission gear 64 is fixed to the output shaft 63 of the hydraulic motor 62 of the continuously variable transmission 6, and the transmission gears 32 and 33 are fixed to the intermediate transmission shaft 31 supported by the transmission case 3. The transmission gears 64 and 32 are engaged with each other. A transmission shaft 34 for branching is supported on the transmission case 3, and a transmission gear 33 fixed to the intermediate transmission shaft 31 and a transmission gear 35 fixed to the transmission shaft 34 for branching are engaged with each other.
The right and left side gears 37 are fitted on the branching transmission shaft 34 so as to be relatively rotatable and slidable, and the transmission gear 36 fixed to the right and left axles 38 is engaged with the right and left side gears 37. The drive sprocket 1a (see FIG. 1) of the left crawler travel device 1 is fixed to the ends of the right and left axles 38.

  A pair of left and right side clutches 7 and a pair of left and right side brakes 8 are provided between the branch transmission shaft 34 to which power from the output shaft 63 of the hydraulic motor 62 is transmitted and the left and right axles 38. .

  The side clutch 7 is formed at an end portion of the left and right side gears 37 so as to be engaged with an occlusal portion 34a fixed to the right and left ends of the transmission shaft 34 for branching and at a position facing the occlusal portion 34. Each of the right and left side gears 37, the springs 39 that urge the right and left side gears 37 of the right and left side gears 37 toward the right and left biting parts 34 a of the branch transmission shaft 34, and the right and left side gears 37. It is composed of right and left pistons 49 that can be pushed to move the occlusal portion 37a away from the right and left occlusal portions 34a of the transmission shaft 34 for branching.

  As shown in FIG. 2, the side brake 8 includes a friction plate interposed between left and right side gears 37 that are driven when the side clutch 7 is engaged and side walls 40 and 50 that are fixed portions in the transmission case 3. 80 and the left and right pistons 49 capable of applying a braking force by pressing the friction plate 80.

  In the state shown in FIG. 2, the occlusal portion 37 a of the right side gear 37 is engaged with the right occlusal portion 34 a of the branch transmission shaft 34, and the occlusion portion 37 a of the left side gear 37 is engaged with the left occlusion portion of the branch transmission shaft 34. It is in a state away from 34a. When the right and left side gears 37 are engaged with the right and left occlusal portions 34a of the branching transmission shaft 34 by the biasing force of the spring 39, the power of the intermediate transmission shaft 31 is transmitted to the transmission gear 33 and the transmission gear 35 of the branching transmission shaft 34. The aircraft is transmitted straight to the right and left axles 38 via the branching transmission shaft 34, the right and left occlusion portions 34 a of the branching transmission shaft 34, and the occlusion portions 37 a of the right and left side gears 37.

The input shaft 19 to which the engine power is input is located in the middle of the input shaft 19 that transmits power to the continuously variable transmission 6 provided inside the HST case wall 60 and to the right of the bottom surface of the HST case wall 60. A work gear branching transmission gear 20 is provided at a position corresponding to the split case unit 4 side to extract power to the pre-cutting processing device 2 side.
In the transmission system for the output pulley 26 for outputting the power of the cutting pretreatment device 2, as shown in FIG. 2, the intermediate transmission shaft 21 is supported by the transmission case 3, and the transmission gear is transmitted to the intermediate transmission shaft 21. The transmission gear 20 fixed to the input shaft 19 and the transmission gear 22 of the intermediate transmission shaft 21 are engaged with each other.
An output shaft 25 that is a transmission shaft located at the top of the mission case 3 is supported at the top of the mission case 3, and a transmission gear 24 fixed to the output shaft 25 is engaged with the transmission gear 23. The power of the shaft 19 is transmitted to the output shaft 25 through the intermediate transmission shaft 21, and is transmitted to the pre-cutting processing device 2 through the output pulley 26 and the transmission belt (not shown) fixed to the output shaft 25. It is configured.

[Composition of the contact section]
In the self-detaching combine having the mission case 3 configured as described above, in the present invention, the following configuration is added to the left and right divided case units 4 and 5.
As shown in FIG. 3, on the bottom side of the HST case wall 60 in which the continuously variable transmission 6 in the left split case unit 5 is housed, the tilting of the swash plate 66 that controls the operation amount of the axial plunger 65 is guided. As shown, a guide block 67 is provided.
The guide block 67 is disposed at a position closer to the mating surface 30 side of the transmission case 3 than the plunger 65 and the swash plate 66, and on the other side, that is, on the right divided case unit 4 side. A contact portion 5a that contacts the portion 4a is integrally formed.

The contact portion 5a formed on the guide block 67 is formed in a region indicated by hatching in FIGS. In other words, the left split case unit 5 includes a peripheral wall 52 portion along the outer shape thereof, and the mating surface 30 is formed at the end of the peripheral wall 52 on the side facing the right split case unit 4. Yes.
The contact portion 5a formed on the guide block 67 is formed flush with the mating surface 30 portion formed at the end of the peripheral wall 52 portion along the outline shape of the divided case unit body 5. However, as can be seen from the hatched area shown in FIGS. 4 and 5, it is not in the so-called peripheral wall 52 portion, but is formed in a state where it enters the space portion inside the case surrounded by the peripheral wall 52. .

The contact portion 5a is formed in a partial arc shape around the axis of the input shaft 19 that transmits power to the continuously variable transmission 6, outside the transmission gear 20 fixed to the input shaft 19, and along the periphery of the guide block 67 portion. Is formed.
In the example shown in FIG. 3, the contact portion 5 a is formed so that the input shaft 19 has a shape along the outer periphery of both the transmission gear 20 fixed to the input shaft 19 and the transmission gear 22 meshing with the transmission gear 20. 19 is formed in a partial arc shape formed by a partial arc along the axis of 19 and a partial arc along the axis of the intermediate transmission shaft 21, and is provided on the peripheral portion of the guide block 67.

  The contact portion 4a formed on the right divided case unit 4 side is symmetrical with respect to the contact portion 5a provided on the guide block 67 with the mating surface 30 of the mission case 3 as a boundary. It is formed in the position. Therefore, as shown by hatching in FIG. 5, it is not in the so-called peripheral wall 42 portion but in a state of entering the space portion on the inner side of the case surrounded by the peripheral wall 42. Also in this contact portion 4 a, the contact portion 4 a is formed flush with the mating surface 30 portion formed at the end of the peripheral wall 42 portion along the outline shape of the divided case unit body 4.

[Parking brake device]
7 to 9 show a parking brake device 9 of the present invention.
The parking brake device 9 includes a parking brake operation shaft 90 that can be operated from the outside of the mission case 3, a friction plate 91 supported by the parking brake operation shaft 90, and the friction plate 91 in the axial direction of the parking brake shaft 90. And a braking operation mechanism 92 that sandwiches the pressure.

The parking brake operating shaft 90 has a shaft portion on one end side exposed to the outside of the transmission case 3, and a brake operating tool constituted by a manually operated foot pedal or the like on an arm end portion 90a of the exposed end portion. (Not shown) are linked.
The friction plate 91 and the braking operation mechanism 92 are externally fitted to the shaft portion on the other end side inserted into the mission case 3, and the friction plate 91 is supported in a loosely fitted state. The brake operation mechanism 92 is configured to pinch the friction plate 91 in accordance with the rotation operation around the axis of the parking brake operation shaft 90.

  The friction plate 91 is a set of a geared disc 93 (disk-like friction member) having a gear portion 93a formed on the outer peripheral portion thereof and a sandwiching plate 94 (fixed side friction member) that sandwiches the geared disc 93 from both sides. A portion of the sandwiching plate 94 that is located outside the outer diameter of the geared disc 93 is provided with a detent pin 95 that restricts the rotation of the sandwiching plate 94 on the left and right divided cases. The unit bodies 4 and 5 are provided.

The braking operation mechanism 92 is positioned between the movable rotating body 96 and the friction plate 91 so as to rotate in conjunction with the rotation operation of the parking brake operating shaft 90 and the parking brake operating shaft. 90 is constituted by a rotating cam mechanism comprising a fixed member 97 supported so as to be movable only in the axial direction, and a steel ball 98 positioned between the movable rotating body 96 and the fixed member 97. Yes.
In the braking operation mechanism 92, the rotation operation force of the parking brake operation shaft 90 is engaged with the locking pin 90b via the locking pin 90b provided in a state of penetrating the parking brake operation shaft 90. The rotation of the fixed member 97 transmitted to the movable rotating body 96 having the split groove portion 96a is configured to be performed by a non-rotating pin 95 that prevents the friction plate 91 from rotating.

In the braking operation mechanism 92 described above, when the parking brake operation shaft 90 is in a non-operating state on the opposing surface of the movable rotating body 96 and the fixed member 97, that is, a brake in which the parking brake device 9 is not operated. When in the released state, a recess into which the steel ball 98 enters is provided so that the fixing member 97 is not pressed against the friction plate 7 side.
When the parking brake operating shaft 90 is rotated, that is, when the parking brake device 9 is operated in the parking brake operating state, the locking pin 90b rotates the movable rotating body 96 and is positioned in the recess. The steel ball 98 that has been removed is gradually pushed out to press the fixing member 97 toward the friction plate 91.
Along with this, on the friction plate 91 side, the geared disc 93 is sandwiched by the sandwiching plates 94 on both sides and the rotation thereof is restricted. As a result, the rotation of the transmission gear 32 meshed with the gear portion 93a of the geared disc 93 is restricted, and the rotation of the intermediate transmission shaft 31 is stopped, so that the transmission direction of the intermediate transmission shaft 31 is reduced. A braking force is applied to the left and right crawler traveling devices 1 arranged on the lower side.

[Another Embodiment of the Invention]
[1] In the above-described embodiment, as the friction plate 91 that is a component of the parking brake device 9, the geared disc 93 is configured by two friction plates, but is not limited to such a structure. The geared disc 93 may be constituted by a large number of three or more geared discs 93, or the friction plate 91 may be constituted by a single geared disc 93 and a sandwiching plate 94.

[2] In the embodiment of the present invention, the width of the aircraft body is relatively wide, having a pretreatment device for cutting a small number of trimmings that causes two or three stalks to be cut and trimmed along with two trigger paths. This example was applied to a narrow and small combine harvester. However, the present invention is not limited to such a small combine. Also good.

[3] The present invention is applied not only to a combine but also to various vehicles using a braking mechanism having a friction plate in a split case, such as a farm tractor, a mower, a paddy field work machine such as a riding rice transplanter, or a wheel loader. May be.

Combine side view Longitudinal front view of the mission case Longitudinal front view of the top of the mission case Exploded side view showing the split case unit on the left side of the mission case Exploded side view showing the split case unit on the right side of the mission case Longitudinal front view showing the disassembled state of the mission case Exploded side view showing the placement relationship between the split case unit on the left side of the mission case and the transmission Sectional view showing parking brake device Aa line sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling device 3 Mission case 7 Side clutch 9 Parking brake device 34 Transmission shaft for branching 90 Brake operation shaft 91 Friction plate 92 Braking operation mechanism 93 Disc-shaped friction member 93a Gear portion 94 Fixed side friction member

Claims (4)

The brake friction plate provided in the transmission case is supported by a parking brake operation shaft that can be operated from the outside of the transmission case, and the transmission plate gear is engaged with the friction plate provided on the parking brake operation shaft. Forming a gear part,
A parking brake device comprising a braking operation mechanism that clamps the friction plate in accordance with a rotation operation from the outside with respect to the parking brake operation shaft. The parking brake device according to claim 1, wherein the parking brake operating shaft is configured as a separate shaft from the branching transmission shaft provided with a side clutch for intermittently transmitting and receiving the transmission power to the pair of left and right traveling devices.   The parking brake device according to claim 2, wherein the parking brake operation shaft is disposed upstream of the branch transmission shaft in the power transmission direction.   The braking friction plate is composed of a combination of a plurality of disc-shaped friction members having a transmission gear portion formed on the periphery thereof, and is configured to be braked by the pinching force between the plurality of fixed side friction members. The parking brake device according to claim 1, 2, or 3.

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