JP2542439Y2 - Brake device for skid steer loader - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a skid steer loader, which improves a coupling mechanism between a brake pedal and a braking brake arm of a traveling system driving device which is disposed at right and left distances.

[0002]

2. Description of the Related Art A pair of left and right traveling system driving devices which are driven independently of each other and are disposed at right and left sides of a vehicle body are provided. One of the left and right driving wheels and the other of the left and right driving wheels are rotated at different speeds. Conventionally, a skid steer loader that performs steering by using a steering wheel has been used.

FIG. 8 shows a plan configuration of a brake device of a skid steer loader. A braking brake arm 101 of a driving system driving device on the left, a braking brake arm 102 of a driving system driving device on the right, and a vehicle body 103 are shown. , A brake pedal 104 disposed to the right of
Connecting mechanism 1 for connecting brake pedal 102 and brake pedal 104
05. When the brake pedal 104 is depressed, both arms 101 and 102 are moved along the vertical axes 106 and 10.
By rotating about seven times, the traveling system drive device is braked.

[0004] The connecting mechanism 105 includes a brake pedal 1.
Equalizer 1 that moves in the front-back direction when stepping on 04
08. The equalizer 108 is composed of blocks for equally distributing the brake operation force to the left and right brake arms 101 and 102.
, The right brake arm 102 is connected by a cable 109, and the left brake arm 10 is connected to a cable 11.
Linked by 0.

[0005]

In the above-described skid steer loader, since it is necessary to drive the left and right traveling system driving devices independently and to brake with a single brake pedal 104, the brake is required. The operating force of the pedal 104 was transmitted to the left and right brake arms 101 and 102 via the cables 109 and 110.

However, the brake pedal 104 is
3, the cable 110 for connecting the left brake arm 101 and the brake pedal 104 had to be bent as shown.
Since the bending of the cable 110 causes a loss of the brake operation force, there is a problem that a difference occurs in the brake braking force of the left and right traveling drive systems.

Further, since the cables 109 and 110 extend as they are used, the connecting mechanism 105 is used to correct the extension.
Had to be adjusted.

Therefore, it is conceivable to transmit the brake operating force to the brake arm via a link mechanism without using a cable. However, since a skid steer loader is required to be reduced in size, a link mechanism is used. Even in this case, it is necessary to make the structure as compact as possible.

An object of the present invention is to provide a brake device for a skid steer loader that can solve the above technical problems.

[0010]

SUMMARY OF THE INVENTION The present invention is characterized in that a pair of left and right traveling system drive units which are driven independently of each other and are arranged at a distance from each other on the left and right sides of the vehicle body. A braking brake arm of the device, a braking brake arm of the right traveling system drive device, a brake pedal disposed on the right side of the vehicle body, and a coupling mechanism for coupling both brake arms and the brake pedal, In a skid steer loader that brakes both driving devices by rotation of both arms by depressing the brake pedal, the connecting mechanism is connected to a brake pedal and moves in the front-rear direction by depressing the brake pedal;
A first link rod connected to the equalizer and moving in the front-rear direction together with the equalizer, an intermediate link connected to the equalizer so as to be relatively rotatable around the vertical axis, and attached to the vehicle body so as to be rotatable about the vertical axis; A second link rod connected to the intermediate link and moving in the left-right direction by rotation of the intermediate link, and the first link rod is connected to the right brake arm;
The second link rod is connected to the left brake arm.

[0011]

According to the structure of the present invention, when the brake pedal is depressed, the equalizer moves in the front-rear direction. This forward / backward movement of the equalizer is transmitted to the right brake arm via the first link rod, and the right brake arm rotates, thereby braking the right traveling system drive device. Also,
The intermediate link rotates around the vertical axis due to the forward and backward movement of the equalizer, and the rotation of the intermediate link is transmitted to the left brake arm via the second link rod, and the left brake arm rotates to rotate the left brake arm. One of the traveling system drive devices is braked.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

A skid steer loader 1 shown in FIG. 7 includes a frame 2 constituting a vehicle body, a column 3 attached to a rear end of the frame 2, and a boom mounted on the column 3 so as to be vertically movable about a horizontal axis 4. 5, a bucket 6 attached to the tip of the boom 5, and front and rear wheels 7, 8 for supporting the vehicle body 2. By that frame 2,
A head guard 9 for protecting an operator sitting on the cab seat 10 is supported. The front of the head guard 9 is an entrance for an operator. The head guard 9 is rotatable about a horizontal axis 9a for maintenance and inspection.

FIGS. 2 to 4 show a left traveling system drive device 11 for driving a left front wheel axle 7L and a left rear wheel axle 8L.
And a right traveling system drive device 12 for driving a right front wheel axle 7R and a right rear wheel axle 8R, and a brake device 13.

The left and right traveling system driving devices 11 and 12 are disposed apart from each other in the left and right directions, and transmission cases 16 and 17 provided inside the side walls 14 and 15 of the frame, respectively.
It has. Each transmission case 16, 17
The hydrostatic motors 18 and 19 are attached to the inside. Each hydrostatic motor 1
8 and 19 are rotated by supply of hydraulic oil sent from a pair of pumps 36 and 37 driven by an engine 35 mounted on the rear part of the vehicle body 1. One of the pumps 36 and 37 is connected to the left motor 18 and the other is the right motor 19.
It is connected to the. Further, a pair of operation levers 38 are provided on the left and right sides of the seat 10.
The rotation speed of one of the motors 8 and 19 changes, and the other rotation speed of the pumps 36 and 37 changes by the other operation of the operation lever 38, and the other rotation speed of the motors 18 and 19 changes.

The output shaft 18a of the left motor 18 is arranged in front of the output shaft 19a of the right motor 19. Thus, when the left motor 18 is attached to and detached from the left transmission case 16, the right motor 19 does not interfere, and the right motor 19 is similarly attached to and detached from the right transmission case 17. At this time, the left motor 18 does not interfere, so that the motors 18 and 19 can be easily mounted and inspected.

In each of the transmission cases 16 and 17, output shafts 18a, 1
9a, brake discs 24, 25 and sprockets 20, 21, 22, 23, respectively, are attached to the outer sprocket 2 attached to the left output shaft 18a.
A chain 27 is wrapped around 0 and a sprocket 26 attached to the left front wheel axle 7L, and attached to the inner sprocket 21 attached to the left output shaft 18a and the left rear wheel axle 8L. A chain 29 is wound around the sprocket 28, and a chain 31 is wound around the outer sprocket 22 attached to the right output shaft 19a and the sprocket 30 attached to the right front wheel axle 7R. Inner sprocket 23 attached to one output shaft 19a and right rear wheel axle 8R
A chain 33 is wound around a sprocket 32 attached to the chain. Thus, when the right motor 18 and the left motor 19 rotate at the same speed, the skid steer loader 1 goes straight, and the right motor 18 and the left motor 19 rotate at different speeds or mutually rotate. When the skid steer loader 1 rotates in the opposite direction, the skid steer loader 1 enters a skid steer state in which the skid steer loader changes direction while sliding.

As shown in FIG. 4, blocks 40 and 41 each having a lateral hole 43 are mounted inside each of the transmission cases 16 and 17. As shown in FIGS. 5 and 6, a notch 42 is formed in the lower portion of each of the blocks 40 and 41.
The top of 5 is inserted. In addition, each block 40, 4
A pair of brake pads 44 and 45 and a pressing member 46 are inserted into one lateral hole 43. Brake discs 24, 25 are arranged between the pair of brake pads 44, 45. Also, a vertical hole 4 is provided in each bracket 40, 41.
A cam shaft 48 is inserted into the vertical hole 47 so as to be rotatable about the vertical axis. The cam shaft 48 has a cam surface 49 opposing the pressing member 46.

As shown in FIG. 6A, when the cam surface 49 and the pressing member 46 are separated from each other, the brake disc 2
4 and 25 are rotatable. In this state, the cam shaft 48 rotates, and when the cam surface 49 presses the pressing member 46 as shown in FIG.
The wheels 4 and 25 are sandwiched between the brake pads 44 and 45 and are prevented from rotating.

At the upper end of each cam shaft 48, brake arms 50, 51 for braking are attached by bolts 52.
As shown in FIGS. 1-3, both brake arms 50, 51
Is connected to the brake pedal 53 via a connection mechanism 54. The brake pedal 53 is disposed on the right side of the vehicle body 2, and is connected to the inner side surface of the transmission case 17 on the right side so as to be rotatable about the left and right horizontal axis 55.

The connecting mechanism 54 includes an equalizer 56,
It has a first link rod 69, an intermediate link 57, and a second link rod 58.

The equalizer 56 applies the brake operating force to the right brake arm 51 and the left brake arm 50.
And a connecting rod 59 extending in the front-rear direction is inserted through the center of the block. A bifurcated portion is provided at the front end of the connecting rod 59,
This bifurcated portion is connected to the brake pedal 53 so as to be relatively rotatable about the left and right horizontal axes 60, and an equalizer 56 is provided at the rear end.
There is provided a flange 61 for preventing falling off. A compression coil spring 62 is interposed between the flange 61 and the equalizer 56. The spring 62 is not compressed during normal braking operation, but is compressed by further depressing the brake pedal 53 to a parking position when parking. After the brake pedal 53 is depressed to the parking position, the lock lever R, which is rotatably mounted on the vehicle body around the longitudinal axis, is rotated in the direction of the arrow in FIG. , And a parking brake function can be achieved.

The first link rod 69 extends in the front-rear direction and is provided with a forked portion at its front end. The forked portion is connected to the left end of the equalizer 56 so as to be relatively rotatable about the longitudinal axis 63. . A forked portion is also provided at the rear end of the first link rod 69, and the forked portion is connected to the right brake arm 51 so as to be relatively rotatable about a longitudinal axis 64.
In this embodiment, the right brake arm 51 protrudes leftward from the cam shaft 48, and a line connecting the longitudinal axis 64 and the cam shaft 48 is substantially perpendicular to the first link rod 69. The transmission efficiency of the brake operation force is improved. A spring 65 is provided between the right brake arm 51 and the vehicle body and between the intermediate link 57 and the vehicle body to bias the brake pedal 53 in the brake release direction.

The intermediate link 57 has an L-shape in plan view in this embodiment, has a portion 57a extending in the left-right direction and a portion 57b extending in the front-rear direction, and is rotatably connected to the vehicle body about a longitudinal axis 66. I have. The right end of the portion 57a along the left-right direction is connected to the right end of the equalizer 56 so as to be relatively rotatable about the vertical axis 70.

The second link rod 58 extends in the left-right direction and is provided with a forked portion at its right end. The forked portion is connected to the rear end of the intermediate link 57 so as to be relatively rotatable about a longitudinal axis 67. . A bifurcated portion is also provided at the left end of the second link rod 58, and the bifurcated portion is connected to the left brake arm 50.
Are connected so as to be relatively rotatable about the longitudinal axis 68. In the present embodiment, the left brake arm 50 projects rearward from the camshaft 48, and a line connecting the longitudinal axis 64 and the camshaft 48 is substantially perpendicular to the second link rod 58. The transmission efficiency of the operating force is improved.

According to the above configuration, when the brake pedal 53 is depressed, the equalizer 56 moves in the front-rear direction, and the first link rod 6 moves by the front-rear movement of the equalizer 56.
9 moves back and forth, and the movement of the first link rod 69 causes the right brake arm 51 to rotate. The rotation of the brake arm 51 brakes the right traveling system drive device 12.

The intermediate link 57 is moved by the forward and backward movement of the equalizer 56 when the brake pedal 53 is depressed.
Rotate around the vertical axis 66. The rotation of the intermediate link 57 causes the second link rod 58 to move in the left / right direction, and the left / right movement of the second link rod 58 causes the left brake arm 50 to rotate. The traveling system drive device 11 is braked.

The brake pedal 53, the intermediate link 5
7. Since each of the brake arms 50 and 51 rotates about the axis, and the connecting rod 59, the first link rod 69, and the second link rod 58 move linearly, these members 53,
The movement of 57, 50, 51, 59, 69, 58 has some play.

According to the above configuration, since the brake operation force is transmitted using the link mechanism without using a cable,
It is not necessary to take measures against loss of brake operation force due to bending of the cable and extension of the cable. The connecting mechanism 54 connecting the brake pedal 53 and each of the brake arms 50, 51 has a link structure that is as compact as possible in order to evenly distribute the brake operating force to the traveling system driving devices 11, 12 that are separated from each other. Therefore, it is suitable as a brake device for a skid steer loader that needs to be reduced in size.
The moving direction of the first link rod 69 and the projecting direction from the rotation center of the right brake arm 51 are substantially orthogonal to each other, and the moving direction of the second link rod 58 and the rotation center of the left brake arm Since it is substantially perpendicular to the direction of protrusion from the brake, the transmission efficiency of the brake operating force is high.

The present invention is not limited to the above embodiment.

[0031]

According to the present invention, the brake operating force can be transmitted by the link mechanism without using a cable, and the braking force of the left and right traveling system drive device can be made uniform. No countermeasure work is required. Moreover, the link mechanism has a structure as compact as possible, so that it is required as a brake device for skid steer loaders, which need to distribute the brake operation force equally to the drive system of the traveling system that is separated to the left and right. It is preferred.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a brake device according to an embodiment of the present invention.

FIG. 2 is a plan view of the brake device of the skid steer loader according to the embodiment of the present invention.

FIG. 3 is a side view of the brake device of the skid steer loader according to the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a partial front sectional view of the brake device according to the embodiment of the present invention;

FIG. 6 is a partial plan sectional view of the brake device according to the embodiment of the present invention;

FIG. 7 is a side view of the skid steer loader according to the embodiment of the present invention;

FIG. 8 is a plan view of a conventional brake device for a skid steer loader.

[Explanation of symbols]

 2 Body 11, 12 Traveling system drive device 50, 51 Brake arm for braking 53 Brake pedal 54 Connecting mechanism 56 Equalizer 57 Intermediate link 58 Second link rod 69 First link rod

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of left and right traveling system driving devices which are driven independently of each other and are disposed apart from each other on the left and right sides of a vehicle body.
A braking brake arm of the left traveling system drive device, a braking brake arm of the right traveling system drive device, a brake pedal arranged on the right side of the vehicle body, and both brake arms and the brake pedal are connected. A skid steer loader that includes a connecting mechanism and that brakes both driving devices by rotation of both arms by depressing a brake pedal, wherein the connecting mechanism is connected to the brake pedal and moves in the front-rear direction by depressing the brake pedal. An equalizer, a first link rod connected to the equalizer and moving in the front-rear direction together with the equalizer, and an intermediate member connected to the equalizer so as to be relatively rotatable around the vertical axis and attached to the vehicle body so as to be rotatable about the vertical axis. Link, and connected to this intermediate link, and by rotating the intermediate link, A skid having a moving second link rod, the first link rod being connected to a right brake arm, and the second link rod being connected to a left brake arm. Brake device for steer loader.