JP2004036659A - Braking device, and running device of tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suitably control the same shaft 11 with a hydraulic braking means 20A and a mechanical braking means 20B. <P>SOLUTION: A brake disk 30 is disposed on the outer periphery of the shaft 11. One side of the brake disk 30 is provided with a support member 33, and the other side of the brake disk 30 is provided with a first pressing member 21 for pressing the brake disk between the support member 33 and it by hydraulic operation. The opposite side of the brake disk 30 with respect to the first pressing member 21 is provided with a second pressing member 22 for pressing the first pressing member 21 by mechanical operation and pressing the brake disk 30 between the support member 33 and it via the pressing member 21. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a brake device and a traveling device that can be suitably used for a tractor or the like.
[0002]
[Prior art]
Generally, a vehicle such as a tractor is provided with a differential device in a transmission case, a rear axle connected to a side of the transmission case, and a rear axle connected to an output shaft of the differential device and a rear axle via a reduction gear. In addition, a brake device is provided on the output shaft.
The brake device includes a brake disk provided on an outer peripheral portion of an output shaft, a brake support provided on one side of the brake disk, and a pressing member for pressing the brake disk provided on the other side. A multi-plate type friction brake (disk brake) is employed, and the disk brake is roughly classified into a hydraulic type and a mechanical type according to the operation form of a pressing member.
[0003]
In the case of a hydraulic brake device, the pressing member is a so-called piston, is slidably supported by a rear axle case or a brake case, and moves to the brake disk side by supply of pressure oil ( For example, see Japanese Patent Publication No. 6-68299). On the other hand, in the case of a mechanical brake device, the pressing member is a cam plate that rotates around an axis by operating a lever or the like, and the ball rides from a cam groove formed in the cam plate by this rotation. As a result, the cam plate moves to the brake disk side (see, for example, Japanese Patent Application Laid-Open No. Hei 7-144504).
[0004]
[Problems to be solved by the invention]
The above-mentioned hydraulic brake device is superior to a mechanical brake device in that operability and responsiveness are good and a large braking force can be easily obtained. Was.
However, in vehicles such as tractors, a parking brake is required in addition to a traveling brake, and such a parking brake is more likely to be a mechanical brake device than a hydraulic brake device that may cause a leak or a change in hydraulic pressure. preferable.
[0005]
Therefore, in the case of a tractor or the like that uses a hydraulic brake device for traveling, a mechanical brake device is separately provided for parking on an input shaft or the like to a differential device, which increases costs and a transmission case. This has led to an increase in size and complexity of the structure.
On the other hand, when a mechanical brake device is used for traveling, it can also be used for parking, but the function as a traveling brake, such as operability and braking force, is still similar to that of a hydraulic brake. It is inferior to that.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a brake device and a tractor traveling device capable of suitably braking the same shaft by a hydraulic brake device and a mechanical brake device. The purpose is to do.
[0007]
[Means for Solving the Problems]
The present invention employs the following technical means to achieve the above object.
That is, the brake device according to the present invention is characterized in that the hydraulic first brake means for braking the rotation of the shaft and the mechanical second brake means are provided side by side.
By using such a brake device for the shaft of the traveling transmission system of the tractor, the first brake means can be used for traveling and the second brake means can be used for parking. The braking method can be selected.
[0008]
In the above case, it is preferable that the first and second brake means are disk brakes and share a brake disk provided to rotate together with the shaft. Accordingly, it is possible to suppress an increase in the size and cost of the brake device due to the provision of the first and second brake means, and it is possible to simplify the structure.
The first and second brake means are disk brakes, and share a brake disk provided to rotate with the shaft and a support member disposed on one side of the brake disk. The means includes, on the other side of the brake disk, a first pressing member that presses the brake disk between the brake disk and the support member by being hydraulically operated, and the second brake means includes a brake disk that sandwiches the first pressing member. It is preferable that a second pressing member that presses the first pressing member by a mechanical operation and presses the brake disc between the supporting member and the support member via the first pressing member is provided on the opposite side. .
[0009]
According to this, the brake disc can be pressed between the support member and the first pressing member by operating the first pressing member by hydraulic pressure to brake the shaft, and the first pressing member can be operated mechanically by the second pressing member. The shaft can be braked by pressing the pressing member and pressing the brake disc between the first pressing member and the support member.
Since the brake disk and the support member are shared by the first and second brake means, it is possible to suppress an increase in size and cost of the brake device, and the structure is simplified.
[0010]
Further, since both the first and second brake means are configured to press the brake disc between the first pressing member and the support member, the first and second brake means are different from the conventional hydraulic brake device (first brake means). A pressing member (second pressing member) in a mechanical brake device is added, or conversely, a hydraulic type is provided between a brake disc and a pressing member (second pressing member) in a mechanical brake device. It can be configured by adding a pressing member (first pressing member) of the brake device.
In the above case, the second pressing member may be configured to directly press the first pressing member, or may press a supporting member (cylinder or the like) that supports the first pressing member movably in the axial direction. A configuration in which the first pressing member is indirectly pressed via the support member may be employed.
[0011]
The first and second brake means are disk brakes, and share a brake disk provided so as to rotate together with the shaft. The first brake means is arranged on one side of the brake disk and brakes by hydraulic operation. It is preferable that a first pressing member that presses the disk is provided, and the second brake means includes a second pressing member that is disposed on the other side of the brake disk and presses the brake disk by mechanical operation.
In this case, by operating the first pressing member by hydraulic pressure, the brake disc can be pressed between the first pressing member and the second pressing member to brake the shaft, and the first pressing member can be operated mechanically to operate the first pressing member. By pressing the brake disc between the pressing member and the pressing member, the shaft can be braked.
[0012]
A brake device according to the present invention includes a brake disc provided on an outer peripheral portion of a rotating shaft, a first pressing member that presses the brake disc by being hydraulically operated to brake the rotation of the shaft, and is mechanically operated. And a second pressing member that presses the brake disk to brake the rotation of the shaft.
In this case, by using such a brake device on a shaft of a traveling transmission system of a tractor, a first pressing member that is hydraulically operated for traveling and a second pressing member that is mechanically operated for parking are used. It is possible to select an optimal braking method according to each application.
[0013]
In addition, since the first and second pressing members act on the same brake disk, it is possible to suppress an increase in size and cost of the brake device, and to simplify the structure.
In the above case, the first and second pressing members are not limited to the configuration in which the brake disk is directly pressed, and other members (including the pressing member on the other side including the pressing member on the other side) are provided between the brake disk and each pressing member. ) May be indirectly pressed in the state of interposing.
[0014]
The present invention is a traveling device of a tractor for transmitting power from an output shaft of a differential device to an axle of drive wheels via a speed reduction device, and brakes the rotation of the output shaft. Is disposed between the differential gear and the reduction gear.
With such a configuration, for example, the first brake means can be used for traveling and the second brake means can be used for parking, and an optimal use method according to each performance can be selected.
[0015]
According to a third aspect of the present invention, there is provided a tractor traveling device for transmitting power from an output shaft of a differential device to an axle of driving wheels via a speed reduction device, wherein the brake device according to claim 3 for braking the rotation of the output shaft. The brake device is disposed between the differential device and the reduction gear device, and the second pressing member of the brake device is provided in a transmission case in which the differential device is installed, and the brake disc and the support member are disposed on the left and right sides of the transmission case. And a case provided with a first pressing member movably in the axial direction is interposed between the transmission case and the axle case.
[0016]
With such a configuration, for example, the first brake means can be used for traveling and the second brake means can be used for parking, and the method of use can be appropriately selected according to the performance of each.
Further, by interposing a brake case having a first pressing member between a transmission case having a second pressing member and an axle case having a brake disk, the brake disk and the second Hydraulic braking means unitized by a brake case and a first pressing member can be added between the pressing member and the pressing member.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 3 shows a part of a traveling device of a tractor employing the brake device 20 according to the present invention. A rear axle case 4 is provided on both left and right sides of a rear portion of a transmission case 2 of the tractor via a brake case 3. A rear wheel (not shown) is connected to a rear axle 5 which is connected and rotatably supported by the rear axle case 4.
A differential device 10 is built in a rear portion of the transmission case 2, and an axially outer end of a differential output shaft 11 protruding left and right from the differential device 10 passes through the brake case 3 into the rear axle case 4. It is inserted and connected to the rear axle 5 via a planetary gear type final reduction device 12. Then, the rear wheel drive system power input to the differential device 10 is transmitted from the output shaft 11 to the rear axle 5 to rotate the rear wheels. The left and right differential output shafts 11 are provided with a multi-plate type friction brake device (disc brake) 20.
[0018]
The differential device 10 is rotatably supported by a side wall 2A of the transmission case 2 or a bearing case 13 fixed to the side wall 2A, and the side plate 2A or the bearing case 13 has a cam plate ( A support portion 14 for supporting the second pressing member (22) movably in the axial direction is formed. The cam plate 22 is provided with a biasing force inward in the axial direction by a tension spring 23.
As shown in FIG. 2, a cam groove 22A whose depth changes in the circumferential direction is formed on the inner surface of the cam plate 22, and a ball 24 accommodated in the side wall 2A or the bearing case 13 is formed in the cam groove 22A. Is engaged.
[0019]
An operation piece 25 is engaged with an outer peripheral portion of the cam plate 22. The operation piece 25 is fixed to one end of an operation shaft 26 rotatably supported by the rear axle case 4. An operation lever 27 is fixed to the end. The operation lever 27 is linked to a parking brake lever (not shown) arranged near the driver's seat of the tractor.
The operation piece 25 is rotated around the axis via the operation shaft 26 by swinging the operation lever 27 by operating the parking brake lever, and the cam plate 22 engaged with the operation piece 25 is rotated around the output shaft 11. To rotate. Then, the ball 24 rides from the cam groove 22A, and the cam plate 22 moves outward in the axial direction (toward the brake piston 21 and the brake disk 30 described later).
[0020]
As shown in FIG. 1, a brake case 3 having a brake piston (first pressing member) 21 is provided outside the cam plate 22 in the axial direction.
The brake case 3 has a cylinder portion 28 at an inner peripheral portion thereof for supporting the brake piston 21 movably in the axial direction of the output shaft 11, and is unitized by the brake case 3 and the piston 21. A hydraulic brake unit is interposed between the transmission case 2 and the rear axle case 4.
A seal 29 is provided between the cylinder portion 28 and the brake piston 21, and an oil passage 28A for supplying pressure oil to an oil chamber formed between the cylinder portion 28 and the brake piston is formed. I have.
[0021]
Then, the brake piston 21 is supplied with pressure oil to the oil passage 28A by the operation of a left and right brake pedal (not shown) provided in the control section of the tractor, so that the brake piston 21 is axially outward (toward a brake disk 30 described later). To move to.
A plurality of brake discs 30 are disposed inside the rear axle case 4 on the outside of the piston 21 in the axial direction, and the inner periphery of the brake disc 30 is engaged with the intermediate portion of the differential output shaft 11 in the axial direction. The differential output shaft 11 rotates together with the differential output shaft 11.
[0022]
A ring-shaped plate 31 is interposed between the brake discs 30. An outer peripheral portion of the plate 31 is fixed between the rear axle case 4 and the brake case 3 in a left-right direction with a fixing pin 32 (FIG. 3). ), And is fixed so as not to rotate with the brake disc 30.
A support member 33 is provided on the inner side of the rear axle case 4 on the outer side in the axial direction of the brake disc 30, and an internal gear 34 of the final reduction gear 12 is provided adjacent to the outside of the support member 33. 4 and is positioned in contact with a stepped portion 4A formed on the inner peripheral portion.
[0023]
The brake device 20 according to the present invention includes a brake disk 30, a plate 31, a support member 33, a brake piston 21, a cam plate 22, and the like. In particular, the brake disk 30, the support member 33, the brake piston 21 And the like constitute a first brake means 20A operated by hydraulic pressure, and the brake disc 30, the support member 33, the cam plate 22 and the like constitute a second brake means 20B mechanically operated via an operation lever 27 and the like. It constitutes. Therefore, the first and second brake means 20A and 20B are arranged side by side in the axial direction of the output shaft 11 with a part of them being overlapped (shared).
[0024]
While the first brake means 20A presses the brake disc 30 between the support member 33 and the brake disk 30 by supplying the pressure oil to the cylinder portion 28 to brake the rotation of the output shaft 11, the first brake means 20A The 2 brake means 20B presses the brake piston 21 with the cam plate 22 by mechanical operation using the operation lever 27 and the like, presses the brake disc 30 with the support member 33 via the brake piston 21, and outputs the output shaft. 11 is to be braked.
The first and second brake means 20A and 20B share the brake disk 30 and the support member 33, so that the size and cost can be suppressed and the structure can be simplified. Has become.
[0025]
In addition, by sharing the brake disk 30, clearance adjustment and the like can be easily performed at one time, and the maintainability is improved.
The hydraulic first brake means 20A is used as a traveling brake, and the mechanical second brake means 20B is used as a parking brake. Optimal use is being made.
The brake device 20 includes a unitized hydraulic brake case 3 between the brake disk 30 and the cam plate 22 (between the transmission case 2 and the rear axle case 4) in a conventional mechanical brake device. With the configuration in which the brake piston 21 is interposed, the brake device 20 of the present invention can be configured without largely changing the structure of a tractor traveling device having a conventional mechanical brake device. It is.
[0026]
In the above-described embodiment, the brake piston 21 is pressed by the cam plate 22. On the contrary, the cam plate 22 is pressed by the brake piston 21 (the cam plate 22 is directly connected to the brake disk 30). Is pressed).
Alternatively, the cam plate 22 and the brake piston 21 may be arranged side by side in the radial direction of the output shaft 11, and each of them may directly press the brake disk individually. FIG. 4 shows a second embodiment of the present invention.
[0027]
In the present embodiment, the cylinder portion 28 is supported on the inner peripheral portion of the brake case 3 so as to be movable in the axial direction. The second brake means 20B causes the cam plate 22 to act on the cylinder portion 28. The brake piston 21 is pressed axially outward together with the cylinder portion 28, and the brake disc 30 is pressed between the brake piston 21 and the support member 33. Further, since the cylinder portion 28 is movable with respect to the brake case 3, a seal 35 for preventing oil leakage is provided between the two.
[0028]
In the present embodiment, the same operation and effect as those of the first embodiment can be obtained, and the detailed description of the common configuration is omitted.
FIG. 5 shows a third embodiment of the present invention.
FIG. 5A shows a configuration in which a cam plate 22 is provided on one side of a brake disc 30 and a brake piston 21 is provided on the other side. The brake disc 30 is shared by 20B, and when one acts, the other functions as a support.
[0029]
5B, another pressing member 22 'is interposed between the cam plate 22 and the brake disc 30, and the cam plate 22 presses the pressing member 22' to thereby press the pressing member 22 '. The brake disc 30 is pressed indirectly via the brake.
In the present embodiment, the support member 33 becomes unnecessary, and the structure is further simplified.
The present invention is not limited to the above embodiment, and the design can be changed as appropriate.
[0030]
【The invention's effect】
As described above in detail, according to the present invention, the same axis can be suitably braked by the hydraulic brake means and the mechanical brake means, and the optimum use in accordance with the characteristics (performance) of each brake means. Will be able to
[Brief description of the drawings]
FIG. 1 is an enlarged view of a portion A in FIG.
FIG. 2 is an enlarged view of a portion B in FIG. 3;
FIG. 3 is a rear cross-sectional view of the traveling device of the tractor employing the brake device according to the first embodiment of the present invention.
FIG. 4 is a sectional view of a main part according to a second embodiment of the present invention.
FIG. 5 is a sectional view of a main part according to a third embodiment of the present invention.
[Explanation of symbols]
2 Transmission case 3 Brake case 4 Rear axle case (axle case)
5 Rear axle (axle)
Reference Signs List 10 Differential device 11 Output shaft 12 Final reduction device 20 Brake device 21 Brake piston (first pressing member)
22 cam plate (second pressing member)
28 Cylinder (support member)
30 Brake disk 33 Support member

Claims (8)

A brake device comprising: a hydraulic first brake means (20A) for braking the rotation of a shaft (11); and a mechanical second brake means (20B). The first and second brake means (20A, 20B) are disk brakes, and share a brake disk (30) provided to rotate together with the shaft (11). The brake device as described. The first and second brake means (20A, 20B) are disk brakes, and are disposed on one side of the brake disk (30) provided to rotate together with the shaft (11). The first brake means (20A) is hydraulically operated on the other side of the brake disc (30) to brake the support member (33) with the support member (33). A first pressing member (21) for pressing the disc (30) is provided, and the second brake means (20B) is mechanically operated on the opposite side of the brake disc (30) across the first pressing member (21). And a second pressing member (22) for pressing the first pressing member (21) and pressing the brake disc (30) with the support member (33) via the pressing member (21). Brake device according to claim 1, wherein Rukoto. The first and second brake means (20A, 20B) are disc brakes, and share a brake disc (30) provided to rotate together with the shaft (11), and the first brake means (20A) Has a first pressing member (21) disposed on one side of the brake disc (30) and pressing the brake disc (30) by hydraulic operation, and the second brake means (20B) is provided with a second pressing member (20B) other than the brake disc (30). The brake device according to claim 1, further comprising a second pressing member (22) disposed on the side and pressing the brake disc (30) by mechanical operation. A brake disc (30) is rotatably provided on an outer peripheral portion of the rotating shaft (11), and is pressed by a hydraulic operation to press the brake disc (30) to brake the rotation of the shaft (11). A brake device comprising: a member (21); and a second pressing member (22) for pressing the brake disc (30) by mechanical operation to brake the rotation of the shaft (11). . A traveling device for a tractor for transmitting rotational power from an output shaft (11) of a differential device (10) to an axle (5) of drive wheels via a speed reducer (12), comprising a differential device (10) and a speed reducer ( A tractor travel device comprising the brake device (20) according to any one of claims 1 to 5, which brakes rotation of the output shaft (11) between the tractor and the tractor. A traveling device for a tractor for transmitting power from an output shaft (11) of a differential device (10) to an axle (5) of drive wheels via a speed reducer (12), comprising a differential device (10) and a speed reducer (12) And a brake device (20) according to claim 3 for braking the rotation of the output shaft (11), and a second pressing member (22) of the brake device (20) is connected to the differential device (20). 10) is provided in a transmission case (2), and the brake disk (30) and the support member (33) are provided in an axle case (4) disposed on the left and right sides of the transmission case (2). A traveling device for a tractor, wherein a brake case (3) including a first pressing member (21) is interposed between a case (2) and an axle case (4). The tractor traveling device according to claim 6 or 7, wherein the first brake means (20A) is a travel brake and the second brake means (20B) is a parking brake.

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