Tractor gearbox brake control assembly

Abstract

The utility model relates to a tractor gearbox brake control assembly which comprises a box body, a piston, an operating rod, a brake rod and a connecting rod. Wherein a V-shaped groove is inwards formed in the end face of the piston, and a first side wall and a second side wall of the V-shaped groove are arranged up and down; the end part of the connecting rod is hinged to the groove bottom of the V-shaped groove; an operator holds the brake rod to perform clockwise action, then the brake rod rotates clockwise around the rotating shaft, the piston and the operating rod are hinged through the connecting rod, the piston moves rightwards along with the connecting rod, hydraulic oil enters the piston cavity, and braking operation is relieved. When the connecting rod rotates to abut against the first side wall of the V-shaped groove, the maximum rotating angle of the brake rod is limited through the connecting rod at the moment, the brake rod and the operating rod cannot continue to conduct clockwise operation, the maximum rightward movement distance of the piston is limited through the arrangement of the first side wall of the V-shaped groove, the movement distance of the piston is controllable, and the piston is prevented from being disengaged from the piston cavity.

Description

Technical Field

[0001] The utility model relates to a tractor gearbox, in particular to a tractor gearbox brake control component. Background Art

[0002] The tractor's gearbox brake assembly is used to control the tractor's movement or braking. It requires the hydraulic oil in the box to be passed to the brake assembly to achieve the tractor's braking;

[0003] The piston needs to be limited in the box to prevent it from leaving the piston cavity or making rigid contact with the piston cavity during the reciprocating motion of the piston;

[0004] The conventional operating method is to limit the swing position of the operating lever. The limit of the operating lever realizes the adjustment of the maximum movement distance of the piston. However, this method is not stable. There is still a possibility that the piston will be separated from the piston cavity or the pistons will be in rigid contact with each other, thereby affecting the braking performance of the tractor.

[0005] In summary, how to achieve controllable piston movement distance and prevent the piston from escaping from the piston cavity has become an urgent problem that researchers in this field need to solve. Utility Model Content

[0006] The technical problem to be solved by the utility model is: how to realize the controllable movement distance of the piston and prevent the piston from being separated from the piston cavity;

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The utility model is a tractor gearbox brake control assembly, comprising: a box body, a piston cavity is horizontally opened in the box body, a longitudinal oil outlet hole is provided on the top of the box body, which is communicated with the piston cavity; a piston is arranged in the piston cavity; an operating rod, one end of which is rotatably arranged in the box body through a rotating shaft; a brake rod is arranged on one side outside the box body, and the bottom of the operating rod is fixedly connected to the end of the rotating shaft; and a connecting rod, one end of which is hinged to the end of the operating rod and the other end of the connecting rod is hinged to the piston; wherein a V-shaped groove is opened inwardly on the end surface of the piston, and the first side wall and the second side wall of the V-shaped groove are arranged up and down; the end of the connecting rod is hinged to the bottom of the V-shaped groove; when the piston moves to the limit state away from the bottom of the piston cavity, the top wall of the connecting rod contacts the first side wall for limiting position;

[0009] In this solution, the operator holds the brake lever and moves it clockwise, and then the brake lever rotates clockwise around the rotating shaft. The piston and the operating lever are hinged by a connecting rod, and the piston moves to the right following the connecting rod. The hydraulic oil enters the piston cavity and the braking operation is released. Since a V-shaped groove is provided on the piston, when the connecting rod rotates to abut against the first side wall of the V-shaped groove, the maximum rotation angle of the brake lever is limited by the connecting rod. The brake lever and the operating lever cannot continue to operate clockwise. By opening the first side wall of the V-shaped groove, the maximum distance the piston moves to the right is limited, so that the piston movement distance can be controlled and the piston is prevented from leaving the piston cavity.

[0010] In order to smoothly drain the hydraulic oil from the oil outlet, the present invention adopts a method of providing an annular groove on the plane of the piston close to the bottom of the piston cavity; when the piston contacts the bottom of the piston cavity, the space formed between the annular groove and the piston cavity is connected to the oil outlet.

[0011] When the piston gradually approaches the bottom of the piston chamber, the remaining part of the hydraulic oil will enter the space between the annular groove and the piston chamber. As the distance between the piston chamber and the piston continues to decrease, the hydraulic oil will be squeezed from the space to the oil outlet hole, and the hydraulic oil will be smoothly discharged.

[0012] In order to prevent the piston from contacting the bottom of the piston chamber, the utility model adopts a first horizontal surface provided at the bottom of the operating rod; a second horizontal surface provided in the box body; when the piston moves to the limit state close to the bottom of the piston chamber, the first horizontal surface and the second horizontal surface contact and limit;

[0013] In this solution, after the brake lever rotates counterclockwise, the first horizontal plane and the second horizontal plane come into surface contact, and the operating lever cannot continue to rotate counterclockwise. At this time, the piston cannot contact the bottom of the piston cavity, avoiding hard contact between the piston cavity and the piston.

[0014] In order to illustrate how the operating lever and the brake lever are connected, the utility model adopts a positioning pin radially penetrating the end of the rotating shaft; the brake lever is provided with a connecting hole that matches the rotating shaft; a positioning hole that matches the positioning pin is provided along the radial direction of the connecting hole; a tightening pin is provided at the end surface of the rotating shaft along its length direction, and the end of the tightening pin abuts against the positioning pin;

[0015] In this solution, the locating pin passes radially through the rotating shaft, and the tightening pin tightens the locating pin laterally to limit the axial movement of the locating pin. Both ends of the locating pin are located in the locating hole of the brake rod, thereby realizing the connection between the operating rod and the brake rod.

[0016] In order to illustrate the connection between the operating rod and the rotating shaft, the present utility model adopts the connection between the rotating shaft and the operating rod via a second positioning pin;

[0017] The second positioning pin connects the operating rod and the rotating shaft to ensure synchronous rotation of the operating rod and the rotating shaft.

[0018] The beneficial effects of the present invention are as follows: the present invention is a brake control component for a tractor gearbox; the operator holds the brake lever and moves it clockwise, and then the brake lever rotates clockwise around the rotating shaft; the piston and the operating lever are hinged by a connecting rod, and the piston moves to the right following the connecting rod, and the hydraulic oil enters the piston cavity to release the braking operation; since a V-groove is provided on the piston, when the connecting rod rotates to abut against the first side wall of the V-groove, the maximum rotation angle of the brake lever is limited by the connecting rod, and the brake lever and the operating lever cannot continue to operate clockwise; and by providing the first side wall of the V-groove, the maximum distance the piston moves to the right is limited, thereby achieving controllable piston movement distance and preventing the piston from leaving the piston cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 It is a cross-sectional view of the utility model in an extreme state;

[0022] Figure 3 It is a cross-sectional view of the utility model in another extreme state;

[0023] In the figure: 1-box, 11-second horizontal surface, 12-oil outlet, 2-piston chamber, 3-piston chamber, 4-piston, 41-annular groove, 5-operating rod, 51-first horizontal surface, 6-rotating shaft, 61-locating pin, 62-tightening pin, 63-second locating pin, 7-brake lever, 8-connecting rod, 9-V-groove, 91-first side wall, 92-second side wall, 10-space. DETAILED DESCRIPTION

[0024] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0025] like Figure 1-3As shown, the utility model is a tractor transmission brake control assembly, comprising: a box body 1, a piston chamber 2 is horizontally opened in the box body 1, a longitudinal oil outlet hole 12 is provided on the top of the box body 1 and is connected to the piston chamber 3; a piston 4 is arranged in the piston chamber 3; an operating rod 5, one end of which is rotatably arranged in the box body 1 through a rotating shaft 6; a brake rod 7 is arranged on one side outside the box body 1, and its bottom is fixedly connected to the end of the rotating shaft 6; and a connecting rod 8, one end of which is hinged to the end of the operating rod 5 and the other end of which is hinged to the piston 4; wherein, a V-shaped groove 9 is opened inwardly on the end surface of the piston 4, and the first side wall 91 and the second side wall 92 of the V-shaped groove 9 are arranged up and down; the end of the connecting rod 8 is hinged to the bottom of the V-shaped groove 9; when the piston 4 moves to the limit state away from the bottom of the piston chamber 2, the top wall of the connecting rod 8 contacts the first side wall 91 to limit the position;

[0026] In this solution, the operator holds the brake lever 7 and moves it clockwise, and then the brake lever 7 rotates clockwise around the rotating shaft 6. The piston 4 and the operating lever 5 are hinged by the connecting rod 8, and the piston 4 moves to the right following the connecting rod 8. The hydraulic oil enters the piston chamber 3 and the braking operation is released. Since a V-shaped groove 9 is provided on the piston, when the connecting rod 8 rotates to abut against the first side wall 91 of the V-shaped groove 9, the maximum rotation angle of the brake lever is limited by the connecting rod 8. The brake lever 7 and the operating lever 5 cannot continue to operate clockwise. By opening the first side wall 91 of the V-shaped groove 9, the maximum distance that the piston 4 moves to the right is limited, so that the moving distance of the piston 4 can be controlled and the piston 4 is prevented from leaving the piston chamber 3.

[0027] like Figure 1-3 As shown, in order to smoothly drain the hydraulic oil from the oil outlet 12, the present invention adopts an annular groove 41 formed on the plane of the piston 4 near the bottom of the piston chamber 2; when the piston 4 contacts the bottom of the piston chamber 2, the space 10 formed between the annular groove 41 and the piston chamber 2 is connected to the oil outlet 12;

[0028] When the piston 4 gradually approaches the bottom of the piston chamber 3, the remaining part of the hydraulic oil will enter the space between the annular groove 41 and the piston chamber 3. As the distance between the piston chamber 3 and the piston 4 continues to decrease, the hydraulic oil will be squeezed from the space 10 to the oil outlet 12, and the hydraulic oil will be smoothly discharged.

[0029] like Figure 1-3 As shown, in order to prevent the piston from contacting the bottom of the piston chamber, the present invention adopts a first horizontal surface 51 provided at the bottom of the operating rod 5; a second horizontal surface 11 is provided in the box body 1; when the piston 4 moves to the limit state close to the bottom of the piston chamber 2, the first horizontal surface 51 and the second horizontal surface 11 contact and limit;

[0030] In this solution, after the brake lever 7 rotates counterclockwise, the first horizontal plane 51 and the second horizontal plane 11 come into surface contact, and the operating lever 5 cannot continue to rotate counterclockwise. At this time, the piston 4 cannot contact the bottom of the piston chamber 3, avoiding hard contact between the piston chamber 3 and the piston 4.

[0031] like Figure 1-3 As shown in the figure, in order to illustrate how the operating lever and the brake lever are connected, the utility model adopts a positioning pin 61 radially penetrating the end of the rotating shaft 6; the brake lever 7 is provided with a connecting hole that matches the rotating shaft 6; a positioning hole 71 that matches the positioning pin 61 is provided along the radial direction of the connecting hole; a tightening pin 62 is provided at the end surface of the rotating shaft 6 along its length direction, and the end of the tightening pin 62 abuts against the positioning pin 61;

[0032] In this solution, the positioning pin 61 radially passes through the rotating shaft 6, and the tightening pin 62 laterally tightens the positioning pin 61 to limit the axial movement of the positioning pin 61. The two ends of the positioning pin 61 are located in the positioning holes of the brake rod 7, thereby realizing the connection between the operating rod 5 and the brake rod 7.

[0033] like Figure 2-3 As shown, in order to illustrate the connection between the operating rod and the rotating shaft, the present invention adopts the connection between the rotating shaft 6 and the operating rod 5 via a second positioning pin 63;

[0034] The second positioning pin 63 connects the operating rod 5 and the rotating shaft 6 to ensure synchronous rotation of the operating rod 5 and the rotating shaft 6 .

[0035] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. Tractor gearbox brake control assembly, characterized in that, include: A box body, wherein a piston cavity is horizontally opened in the box body, and a longitudinal oil outlet hole is provided on the top of the box body, which is in communication with the piston cavity; a piston disposed in the piston chamber; An operating lever, one end of which is rotatably arranged in the box body via a rotating shaft; a brake lever, which is arranged on one side of the box body, and the bottom of which is fixedly connected to the end of the rotating shaft; and a connecting rod, one end of which is hinged to the end of the operating rod and the other end of which is hinged to the piston; Wherein, a V-shaped groove is provided inwardly on the end surface of the piston, and the first side wall and the second side wall of the V-shaped groove are arranged up and down; The end of the connecting rod is hinged to the bottom of the V-shaped groove; When the piston moves to a limit state away from the bottom of the piston chamber, the top wall of the connecting rod contacts the first side wall for limiting position.

2. The tractor transmission brake control assembly according to claim 1, characterized in that: The piston is provided with an annular groove on a plane close to the bottom of the piston cavity; When the piston contacts the bottom of the piston chamber, the space formed between the annular groove and the piston chamber is communicated with the oil outlet hole.

3. The tractor transmission brake control assembly according to claim 1, characterized in that: The bottom of the operating rod is provided with a first horizontal surface; A second horizontal surface is provided in the box; When the piston moves to a limit state close to the bottom of the piston chamber, the first horizontal plane and the second horizontal plane contact and limit.

4. The tractor transmission brake control assembly according to claim 1, characterized in that: A positioning pin is radially provided at the end of the rotating shaft; The brake rod is provided with a connecting hole that matches the rotating shaft; A positioning hole matching the positioning pin is opened along the radial direction of the connecting hole; A tightening pin is provided at the end surface of the rotating shaft along its length direction, and the end of the tightening pin abuts against the positioning pin.

5. The tractor transmission brake control assembly according to claim 1, characterized in that: The rotating shaft and the operating rod are connected via a second positioning pin.

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