Brake for tractor

Abstract

The utility model belongs to the technical field of brakes, and particularly relates to a brake for a tractor, which comprises a shell, a mounting cavity is arranged in the shell, a brake disc and a friction plate are mounted in the mounting cavity, and the inner side wall of the shell extends towards the interior of the mounting cavity to be provided with a first connecting part. The inner edge of the first connecting part extends towards the brake disc to form a second connecting part, sealing rings are arranged between the brake disc and the shell and between the brake disc and the second connecting part, the sealing rings are in sealing sliding fit with the brake disc, and a sealing cavity is formed among the sealing rings, the first connecting part, the second connecting part, the inner side wall of the shell and the brake disc. The sealing rings are located on the side, away from the first connecting part, of the sealing cavity, the shell is provided with a brake oil inlet, and the brake oil inlet communicates with the sealing cavity. Under the action of resilience force of the first sealing ring, the second sealing ring and the third sealing ring, the brake disc returns, the brake disc and the friction plate are prevented from being in a semi-linkage state, brake failure is prevented, and driving safety is prevented from being affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of brakes, and in particular relates to a brake for a tractor. Background Art

[0002] The tractor brake is an important device in the tractor's braking system, which enables the tractor to slow down and stop while driving.

[0003] Existing tractor brakes generally include a brake housing, a piston, a friction plate and a sealing ring. Its main working principle is: after the driver steps on the brake pedal, the brake fluid enters the closed area surrounded by the brake housing, the piston and the sealing ring from the brake fluid inlet, and the brake fluid pushes the piston to move axially, pressing the friction plate against the bearing seat, and braking is generated by friction.

[0004] Among them, there is chassis oil between the friction plate and the piston. When the tractor brake stops braking, the piston and the friction plate are pushed apart by the action of the chassis oil. However, the piston and the friction plate will be separated for a long time only by the action of the chassis oil, resulting in a semi-linked state between the piston and the friction plate. The piston cannot return to its original position quickly. The long-term friction between the piston and the friction plate generates a large amount of heat, which increases the oil temperature of the chassis oil. The chassis oil undergoes physical changes of thermal expansion and contraction, which increases the thrust on the piston. When continuous braking is required, the piston cannot squeeze the friction plate, resulting in a weakened braking effect or brake failure, affecting driving safety. Utility Model Content

[0005] The purpose of the utility model is to provide a brake for a tractor to solve the problems raised in the above background technology.

[0006] In order to achieve the above technical purpose, the technical solution of the utility model is:

[0007] A tractor brake comprises a housing, the two ends of the housing are open, an installation chamber is provided in the housing, a brake disc and a friction plate are installed in the installation chamber, a gap is left between the brake disc and the friction plate, a first connecting portion is provided on the inner side wall of the housing extending toward the installation chamber, a second connecting portion is provided on the inner edge of the first connecting portion extending toward the direction of the brake disc, a cavity for accommodating the brake disc is formed between the housing and the first connecting portion and the second connecting portion; a sealing ring is provided between the brake disc, the housing and the second connecting portion, the sealing ring is in sealing and sliding cooperation with the brake disc, a sealed cavity is formed between the sealing ring, the first connecting portion, the second connecting portion, the inner side wall of the housing and the brake disc, and the sealing ring is located on a side of the sealed cavity away from the first connecting portion; a brake oil inlet is provided in the housing, and the brake oil inlet is communicated with the sealed cavity.

[0008] As an improvement, the brake disc is provided with an annular sliding portion, the sliding portion is located in the cavity, one end of the sliding portion close to the second connecting portion is connected to a friction portion, and the friction portion extends toward the middle of the installation chamber.

[0009] As a further improvement, a first sealing groove and a second sealing groove are provided on the inner wall of the shell, a third sealing groove is provided on the side of the second connecting part close to the cavity, and sealing rings are provided in the first sealing groove, the second sealing groove and the third sealing groove.

[0010] As a further improvement, the first sealing groove, the second sealing groove and the third sealing groove are all provided with a groove bottom, and groove walls are provided on both sides of the groove bottom, and the angle between the plane where the two groove walls are located and the plane where the groove bottom is located is greater than 90 degrees.

[0011] As a further improvement, the sealing rings all adopt four-lip sealing rings.

[0012] As a further improvement, the friction plate is a wet friction plate.

[0013] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] The tractor brake provided by the utility model has the following characteristics: when braking, brake oil enters the sealing chamber through the brake oil inlet, and as the pressure increases, the brake disc is pushed to move in the direction of the friction plate, squeezing the friction plate so that the friction plate is pressed against the bearing seat, thereby generating a braking effect; at the same time, the first sealing ring, the second sealing ring and the third sealing ring are stretched; since the first sealing ring, the second sealing ring and the third sealing ring are all located on one side of the sealing chamber, when braking stops, the brake oil leaves the sealing chamber, and under the action of the rebound force of the first sealing ring, the second sealing ring and the third sealing ring, the brake disc returns to its original position, thereby preventing the brake disc and the friction plate from being in a semi-linked state, thereby ensuring the braking effect of the next braking.

[0015] Under the action of the first sealing ring, the second sealing ring and the third sealing ring, the brake disc returns to its position in time without generating a large amount of heat. In addition, the friction plate adopts a wet friction plate. A chassis oil outlet is arranged on the brake disc. The chassis oil returns to the chassis oil circulation oil circuit through the chassis oil outlet to circulate, thereby taking away the heat generated by the friction plate and preventing the chassis oil temperature from being too high, thereby increasing the thrust on the piston. During continuous braking, the braking effect will not weaken, and the friction plate temperature can be prevented from being too high, thereby increasing the service life of the friction plate.

[0016] The surface roughness of the first sealing groove, the second sealing groove and the third sealing groove is 3.2µm, which prevents the first sealing ring, the second sealing ring and the third sealing ring from shifting when the first sealing ring, the second sealing ring and the third sealing ring are stretched, resulting in reduced sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of this embodiment;

[0018] Figure 2 is a cross-sectional view of this embodiment;

[0019] Figure 3 yes Figure 2 A magnified view of part A;

[0020] Among them: 1-housing, 2-brake disc, 3-friction plate, 4-brake oil inlet, 5-first connecting part, 6-second connecting part, 7-first sealing groove, 8-second sealing groove, 9-third sealing groove, 10-sealing cavity, 11-sliding part, 12-friction part, 13-chassis oil outlet, 14-first positioning hole, 15-groove bottom, 16-groove wall, 17-second positioning hole. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the specific implementation methods and the accompanying drawings. The accompanying drawings are only for illustrative purposes and are only schematic diagrams, not actual drawings, and should not be construed as limiting the present application. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. It is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0022] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] like Figure 1-3 As shown, a tractor brake comprises a housing 1, a brake disc 2 and a friction plate 3. The housing 1 is open at both ends, and a mounting chamber is provided in the housing 1. The brake disc 2 and the friction plate 3 are arranged in the mounting chamber, and a gap is provided between the brake disc 2 and the friction plate 3. A brake oil inlet 4 is provided on the housing 1, and a first connecting portion 5 is provided on the inner side wall of the housing 1 extending toward the mounting chamber, and a second connecting portion 6 is provided on the inner edge of the first connecting portion 5 extending toward the brake disc, and a cavity for accommodating the brake disc 2 is formed between the housing 1 and the first connecting portion 5 and the second connecting portion 6.

[0024] A first sealing groove 7 and a second sealing groove 8 are provided on the inner side wall of the housing 1. The first sealing groove 7 is arranged away from the first connecting part 5, and the second sealing groove 8 is arranged close to the first connecting part 5. A third sealing groove 9 is provided on the side of the second connecting part 6 close to the cavity. The axial outer peripheral surface of the brake disc 2 is crimped on the inner side wall of the housing 1 through a first sealing ring. The first sealing ring is located in the first sealing groove 7. The second sealing ring and the third sealing ring are respectively provided in the second sealing groove 8 and the third sealing groove 9. An annular sealing cavity 10 is formed between the second sealing ring, the brake disc 2, the third sealing ring, the housing 1, the first connecting part 5 and the second connecting part 6, and one end of the brake oil inlet 4 is connected to the sealing cavity 10.

[0025] In this embodiment, the first sealing groove 7, the second sealing groove 8 and the third sealing groove 9 are all arranged on the side of the sealing cavity away from the first connecting portion 5, and the first sealing ring, the second sealing ring and the third sealing ring are all in sealing and sliding cooperation with the brake disc.

[0026] When the driver steps on the brake, the brake oil enters the sealed chamber 10 through the brake oil inlet 4. As the pressure increases, the brake disc 2 is pushed to move toward the friction plate 3, squeezing the friction plate 3 to produce a braking effect. When the driver releases the brake, the brake oil leaves the sealed chamber 10, and the brake disc 2 returns to its original position under the action of the rebound force of the first sealing ring, the second sealing ring and the third sealing ring.

[0027] In this embodiment, the brake disc 2 is provided with an annular sliding portion 11, the sliding portion 11 is located in the cavity, the end of the sliding portion 11 close to the second connecting portion is connected to the friction portion 12, the friction portion 12 extends toward the middle of the installation chamber, the second sealing ring is located on the outer wall of the sliding portion 11, the third sealing ring is located on the inner wall of the sliding portion 11, and a chassis oil outlet is provided on the brake disc 2, the chassis oil outlet passes through the side wall of the brake disc 2 and is obliquely arranged on the brake disc 2.

[0028] When the brake oil generates thrust on the brake disc, the brake oil pushes the sliding part to move toward the friction plate, and then drives the friction part to move toward the friction plate until the friction part and the friction plate are in contact. The friction part and the friction plate generate friction to perform braking. When the brakes are stopped, the thrust of the brake oil on the brake disc disappears, and the sliding part moves in the direction away from the friction plate, thereby driving the friction part to separate from the friction plate.

[0029] In this embodiment, the first sealing groove 7, the second sealing groove 8 and the third sealing groove 9 all include a groove bottom 15 and two groove walls 16, the two groove walls 16 are respectively located on both sides of the groove bottom 15, and the sides of the two groove walls 16 away from the groove bottom 15 are inclined in the direction away from the central axis of the groove bottom 15, and the angle between the plane where the groove wall is located and the plane where the groove bottom is located is greater than 90 degrees. The surface roughness of the first sealing groove 7, the second sealing groove 8 and the third sealing groove 9 is 3.2µm.

[0030] In this embodiment, a plurality of positioning pins are provided between the first connecting portion 5 and the sliding portion 11. Specifically, a plurality of first positioning holes 14 are provided on a side of the first connecting portion 5 close to the sealing cavity, and a plurality of second positioning holes 17 are provided on a side of the sliding portion close to the sealing cavity. The plurality of first positioning holes 14 correspond one-to-one to the plurality of second positioning holes 17, and the plurality of positioning pins are respectively located between the plurality of first positioning holes 14 and the second positioning holes 17. The plurality of positioning pins are distributed along the circumference of the first connecting portion 5, and the positioning pins can limit the relative rotation between the brake disc 2 and the housing 1.

[0031] Preferably, the friction plate 3 adopts a wet friction plate 3. During the braking process, the friction plate 3 will generate a large amount of heat due to friction. The chassis oil circulates in the chassis oil circulation circuit through the chassis oil outlet to take away the heat generated by the friction plate 3, prevent the friction plate 3 from being overheated, and increase the service life of the friction plate 3.

[0032] Preferably, the first sealing ring, the second sealing ring and the third sealing ring are all four-lip sealing rings, which have good sealing effect and can prevent the brake oil in the sealing cavity 10 from flowing out.

[0033] When the present embodiment is in use, when the driver steps on the brake, the brake oil enters the sealed chamber 10 through the brake oil inlet 4. As the pressure increases, the brake disc 2 is pushed to move in the direction of the friction plate 3, squeezing the friction plate 3 so that the friction plate 3 is pressed against the bearing seat, thereby generating a braking effect. While the brake disc 2 moves, the first sealing ring, the second sealing ring and the third sealing ring are stretched. When the driver releases the brake, since the first sealing ring, the second sealing ring and the third sealing ring are all arranged on one side of the sealed chamber, the brake oil leaves the sealed chamber 10. Under the action of the resilience of the first sealing ring, the second sealing ring and the third sealing ring, the brake disc 2 returns to its original position, preventing the brake disc 2 and the friction plate 3 from being in a semi-linked state, thereby ensuring the braking effect of the next brake and preventing the heat generated by continuous friction from heating up the chassis oil, thereby weakening the braking effect during continuous braking and generating danger.

[0034] The utility model ensures that the brake disc can return to its position in time by arranging the first sealing ring, the second sealing ring and the third sealing ring, and prevents the brake disc and the friction plate from being in a semi-linked state, which causes the braking effect to be weakened or the brake fails, thus affecting driving safety.

[0035] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A tractor brake, comprising a housing, the two ends of the housing being open, a mounting chamber being provided in the housing, a brake disc and a friction plate being installed in the mounting chamber, a gap being left between the brake disc and the friction plate, characterized in that: A first connecting portion is provided on the inner side wall of the housing toward the installation chamber, a second connecting portion is provided on the inner edge of the first connecting portion toward the brake disc, and a cavity for accommodating the brake disc is formed between the housing and the first connecting portion and the second connecting portion; A sealing ring is provided between the brake disc, the housing and the second connecting portion, the sealing ring is in sealing and sliding cooperation with the brake disc, a sealing cavity is formed between the sealing ring, the first connecting portion, the second connecting portion, the inner wall of the housing and the brake disc, and the sealing ring is located on a side of the sealing cavity away from the first connecting portion; The housing is provided with a brake oil inlet, and the brake oil inlet is communicated with the sealing cavity.

2. The tractor brake according to claim 1, characterized in that: The brake disc is provided with an annular sliding portion, the sliding portion is located in the cavity, one end of the sliding portion close to the second connecting portion is connected to a friction portion, and the friction portion extends toward the middle of the installation cavity.

3. The tractor brake according to claim 1, characterized in that: A first sealing groove and a second sealing groove are provided on the inner side wall of the shell, a third sealing groove is provided on a side of the second connecting portion close to the cavity, and sealing rings are provided in the first sealing groove, the second sealing groove and the third sealing groove.

4. The tractor brake according to claim 3, characterized in that: The first sealing groove, the second sealing groove and the third sealing groove are all provided with a groove bottom, and groove walls are provided on both sides of the groove bottom, and the angle between the plane where the two groove walls are located and the plane where the groove bottom is located is greater than 90 degrees.

5. The tractor brake according to any one of claims 1 to 4, characterized in that: The sealing rings are all four-lip sealing rings.

6. The tractor brake according to claim 5, characterized in that: The friction plate is a wet friction plate.

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