JPH07304433A - Brake device for tractor - Google Patents

Abstract

PURPOSE:To limit an operating rod from being moved in the far and near directions of right and left brake pedals by providing a pair of regulating pins protruded on one side of the right and left arms protruded from the right and left brake pedals and regulating the positions in the far and near directions of the right and left brake pedals for the operating rod on the other side. CONSTITUTION:Arms 3A, 4A are protruded from boss sections 3B, 4B of the right and left brake pedals 3, 4, and the lower end section of an operating rod 5 connected to a parking brake lever 2 is extended between the right and left arms 3A, 4A. A coupling section 6 coupled with the arms 3A, 4A is formed at the lower end of the operating rod 5 to rock the right and left brake pedals 3, 4 in the depressing direction via the parking brake action. A pair of regulating pins 7, 8 protruded on one side and regulating the position in the far and near directions of the right and left brake pedals 3, 4 for the operating rod 5 are provided on the other arm 4A, and a collar 9 moving the operating rod 5 to the far side is provided on the regulating pin 7. The agile action of the operating rod 5 is assured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for a tractor having a parking brake lever and a pair of left and right brake pedals.

[0002]

2. Description of the Related Art Generally, a tractor has one parking brake lever for operating the left and right brake devices and a pair of left and right brake pedals for enabling a sharp turn. Acts on the operation system of the left and right brake pedals to simultaneously operate the left and right brake devices.

Therefore, the arms are projected from the left and right brake pedals, the operation rod inserted between the left and right arms is connected to the parking brake lever, and the left and right brake pedals are depressed at the tip of this operation rod by the brake operation operation of the parking brake lever. An engaging portion that engages with the arm to swing in the direction is formed.

[0004]

In the prior art described above, the engaging recess is formed in the portion of the arm that engages with the engaging portion in order to prevent disengagement, but this engaging recess is formed roughly. Therefore, when the operating rod is pulled up via the parking brake lever, the angle formed with the arm may change, and the operating rod may move in the perspective direction of the left and right brake pedals.

When the engaging portion of the operating rod moves in this manner with respect to the engaging portion of the arm, the pulling load of the parking brake lever also changes, and the parking brake performance may not be stable at each number of notches. Further, in the prior art, the upper end of the operation rod is pivotally connected to one side of the parking brake lever, and the operation rod may be twisted by the operation of the parking brake lever. There is a case that the sex is reduced.

A first object of the present invention is to provide a pair of restricting pins on one of the left and right arms so that the position of the operating rod can be restricted by the restricting pins, and a collar is provided on the restricting pin near the brake pedal. By providing the operation rod close to the restriction pin on the far side, it is possible to limit the movement of the operation rod in the perspective direction of the left and right brake pedals, and also the relative movement between the operation rod and the left and right brake pedals can be smoothly performed. It is to provide a braking device for a tractor.

A second object of the present invention is to connect the operating rod to the parking brake lever via a bifurcated member so that the operating rod can be operated without being twisted by the operation of the parking brake lever. To provide the equipment.

[0008]

A concrete means for solving the problem in the present invention has a parking brake lever 2 and a pair of left and right brake pedals 3, 4, and the left and right brake pedals 3, 4 are connected to the arm 3A. 4A is projected, the operation rod 5 inserted between the left and right arms 3A, 4A is connected to the parking brake lever 2, and the left and right brake pedals 3 and 4 are depressed at the tip of this operation rod 5 by the brake operation operation of the parking brake lever 2. Arm 3A, 4 to swing in the direction
In a tractor braking device that forms an engaging portion 6 that engages with A, a pair of left and right arms 3A and 4A that protrude toward the other side to restrict the position of the operating rod 5 in the perspective direction of the left and right brake pedals. The restriction pins 7 and 8 are provided, and the restriction pin 7 on the side closer to the brake pedals 3 and 4 is provided with the collar 9 that brings the operation rod 5 closer to the far side.

In addition to the first specific means, the second specific means for solving the problem in the present invention is that the forked member 10 is connected to the end portion of the operating rod 5 on the parking brake lever side, The forked member 10 is connected so as to be sandwiched by the parking brake lever 2.

[0010]

When the parking brake lever 2 is pulled up, the operating rod 5 connected to it is pulled up. The operating rod 5 is inserted between the left and right arms 3A and 4A, and the engaging portion 6 at the tip is the arm 3A, 4A, and the brake pedals 3 and 4 are swung in the depressing direction via the left and right arms 3A and 4A.

The operation rod 5 inserted between the left and right arms 3A and 4A has one arm 3A to the other arm 4
The pair of restriction pins 7 and 8 protruding toward the A side restrict the positions of the left and right brake pedals in the perspective direction, and contact the collar 9 provided on the restriction pin 7 on the side closer to the brake pedals 3 and 4 to the far side. It is sent. When the operation rod 5 and the left and right arms 3A and 4A move relative to each other, the collar 9 rotates to smoothly move the collar 9.

Further, the operating rod 5 is connected to the parking brake lever 2 via the fork member 10, and since the fork member 10 is connected so as to be sandwiched by the parking brake lever 2, the parking brake lever 2 is connected. Operation of the operation rod 5
Pull up without hesitation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a tractor brake device, which is a parking brake lever 2 arranged near a driver's seat.
And the left and right brake pedals 3 and 4 arranged in the right step
And the brake pedals 3 and 4 are connected to the left and right brake devices provided on the rear axle side through operation transmission means, and the parking brake lever 2 is involved in the operation transmission system to operate the left and right brake devices. It is ready for operation at the same time.

A support member 1 fixed to a floor sheet or the like
3, a pivot member 14 is attached, the parking brake lever 2 is pivotally supported on the pivot member 14 via a pivot shaft 15, and the pivot member 14 is provided with a ratchet wheel (notch) 16. The parking brake lever 2 is provided with a pawl 17 that engages with the pawl wheel 16 to prevent the return movement, and the parking brake lever 2 is provided with a release button 18 for releasing the engagement of the pawl wheel 17 from the pawl wheel 16. ing.

Reference numeral 20 denotes a support cylinder fixed to the lower surface of the mission case by a bolt, and a brake shaft 21 is rotatably inserted in the support cylinder 20. Both ends of the brake shaft 21 project from the support cylinder 20, a pair of left and right brake pedals 3 and 4 are arranged at one end thereof, and a clutch pedal is pivotally supported at the other end. The boss portion 3B of the left brake pedal 3 is fixed to the brake shaft 21, and is connected to the left brake device via the bracket and link fixed to the other end of the brake shaft 21.

The boss portion 4B of the right brake pedal 4 is rotatably supported by the brake shaft 21 via a bush 22. A rod is connected to a bracket 24 fixed to the boss portion 4B to brake the right brake device. It is configured to transmit an operating force. A return spring is connected to the brake pedals 3 and 4. From the boss portions 3B, 4B of the left and right brake pedals 3, 4 to the rear arm 3A,
4A is projected, the rear portions of the pair of left and right arms 3A, 4A are positioned in parallel, and the operation rod 5 is inserted between them. The upper end of this operating rod 5 is the parking brake lever 2
Are linked to.

A reinforcing plate 25 is fixed to at least one of the left and right side surfaces of the parking brake lever 2 by welding or the like, and a U-shaped member 26 is fitted and fixed from the lower side and the U-shaped member is fixed from the lower side. The bifurcated member 10 is fitted so as to sandwich the character member 26, and is connected so as to be relatively rotatable via a pin. Alternatively, the U-shaped member 26 may be omitted, and the two-pronged member 10 may be fitted so as to be sandwiched by the parking brake lever 2 to be pin-connected.

The operating rod 5 has a turnbuckle 27 for adjusting the length in the middle thereof, and a circular rod is welded to the lower end thereof to form an engaging portion 6. This engaging portion 6 is an engaging concave portion 28 formed on at least one of the left and right arms 3A, 4A.
Can be engaged from below. The engagement concave portion 28 has an arc shape having a larger radius of curvature than the arc of the upper surface of the engagement portion 6.

Further, on one of the left and right arms 3A and 4A, in the embodiment, the right arm 4A is provided with a pair of front and rear regulating pins 7,
8 is projected to the left arm 3A side, and the operation rod 5 is inserted between the restriction pins 7 and 8, and the position of the left and right brake pedals in the perspective direction is restricted. A collar 9 is loosely fitted to the restriction pin 7 on the side closer to the brake pedals 3 and 4 among the pair of restriction pins 7 and 8.

The collar 9 has a ring shape, and the clearance between the front and rear regulating pins 7 and 8 is reduced to reduce the play, and the operating rod 5 is brought closer to the distant regulating pin 8 to hold the position thereof. The operation force of is not changed and the brake pedals 3 and 4 are efficiently operated.
Further, the collar 9 is rotatable with respect to the restriction pin 7,
The relative movement with the operation rod 5 is made smooth.

The upper end of the operating rod 5 has a forked member 10
Since it is connected to the parking brake lever 2 via
The operation rod 5 can be arranged directly below the parking brake lever 2, and when the parking brake lever 2 is pulled up, the operation rod 5 does not have a twist so as to fall to the left or right, and stable parking brake operation can be performed. Further, by providing the reinforcing plates 25 on the left and right side surfaces of the parking brake lever 2, the strength can be increased to meet the usage conditions. For example, the parking brake lever used in an automobile or the like can be used for a tractor. Will also be possible.

4 and 5 show an example of a lubricating structure for the hydraulic arm shaft. The hydraulic device 31 mounted on the upper rear part of the mission case has a hydraulic arm shaft 3 mounted on the device case 32.
3 is inserted, the piston arm 34 is connected to the center of the hydraulic arm shaft 33, and the hydraulic arms 35 are attached to the left and right ends thereof.
Are connected and fixed, and the pressing plate 38 prevents the hydraulic arm 35 from coming off. The hydraulic arm shaft 33 is supported by the device case 33 via a bush 36.

Lubricating oil needs to be supplied to the bush 36, and conventionally, the splashing oil from the gear in the transmission case is introduced from the hole 37 formed in the device case 32, so that lubrication is insufficient because it is not forced lubrication. As a result, the bush 36 may be prematurely worn. Therefore, an oil hole is formed in the hydraulic arm shaft 33 so as to guide the drained oil of the other portion and forcibly supply it as lubricating oil.

That is, the hydraulic arm shaft 33 has an axial hole 40.
And a large number of radial holes 41 extending radially from the axial hole 40 are formed, and a plug 43 is attached to an attachment bolt 42 for the pressing plate 38 at the end of the hydraulic arm shaft 33.
Waste oil is guided and supplied to the plug 43 from a control valve for the hydraulic device 31 via a hose 44.

An oil seal 45 is provided between the hydraulic arm 35 and the bush 36 to improve the sealing performance. Outer peripheral surface of hydraulic arm shaft 33 and bush 36
An axial and / or circumferential groove that communicates with the radial hole 41 is preferably formed on the inner peripheral surface or the like.

[0026]

According to the present invention described in detail above, a pair of regulating pins 7 and 8 for projecting to the other side of one of the left and right arms 3A and 4A to regulate the position of the operating rod 5 in the perspective direction of the left and right brake pedals is provided. A collar 9 that is provided to bring the operating rod 5 closer to the far side to the regulating pin 7 near the brake pedals 3 and 4.
Since the operation rod 5 is provided, it is possible to restrict the operation rod 5 from moving in the perspective direction of the left and right brake pedals 3 and 4, and it is possible to stabilize the parking brake performance. You can move smoothly.

Further, since the fork member 10 is connected to the end portion of the operating rod 5 on the parking brake lever side, and the fork member 10 is connected so as to be sandwiched between the parking brake lever 2, the operation of the parking brake lever 2 is performed. The operation rod 5 can be operated without being twisted, and the parking brake performance can be stabilized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the main part.

FIG. 3 is a sectional side view of the main part.

FIG. 4 is an exploded perspective view showing an example of a lubricating structure for a hydraulic arm shaft.

FIG. 5 is a sectional view of the same.

[Explanation of symbols]

 2 Parking brake lever 3 Brake pedal 3A arm 4 Brake pedal 4A arm 5 Operation rod 6 Engagement part 7 Restriction pin 8 Restriction pin 9 Collar 10 2 or member 25 Reinforcing plate 26 U-shaped member

Claims (2)

[Claims] 1. A parking brake lever (2) and a pair of left and right brake pedals (3, 4) are provided, the arms (3A, 4A) are projected from the left and right brake pedals (3, 4), and the parking brake lever ( An operation rod (5) which is inserted between the left and right arms (3A, 4A) is connected to 2), and the left and right brake pedals (3, 4, ) Is formed in an engaging portion (6) that engages with the arms (3A, 4A) so as to swing in a stepping direction. A pair of restriction pins (7, 8) that protrude to the left and restrict the position of the operation rod (5) in the perspective direction of the left and right brake pedals are provided, and the operation pin is provided on the restriction pin (7) near the brake pedals (3, 4). (5) Brake system of the tractor, characterized in that is provided a color (9) closer to have side. 2. A bifurcated member (10) is connected to an end of the operation rod (5) on the parking brake lever side, and the bifurcated member (10) is connected so as to be sandwiched by the parking brake lever (2). The brake device for a tractor according to claim 1, wherein