CN210715659U - Wet brake with friction pair clearance automatic compensation function - Google Patents
Wet brake with friction pair clearance automatic compensation function Download PDFInfo
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- CN210715659U CN210715659U CN201921396483.6U CN201921396483U CN210715659U CN 210715659 U CN210715659 U CN 210715659U CN 201921396483 U CN201921396483 U CN 201921396483U CN 210715659 U CN210715659 U CN 210715659U
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Abstract
The utility model provides a wet brake with automatic clearance compensation for friction pair, which comprises a half shaft, a spline sleeve and a piston set which are arranged inside a shell, and a friction pair consisting of friction plates and separation sheets which are alternately arranged at intervals, wherein an elastic component fixed with the shell is arranged on the piston set at the end part of the friction pair in a penetrating way; the piston group comprises a brake piston and a fixed stroke piston, and the fixed stroke piston is embedded in an inner cavity of the brake piston. The utility model discloses well piston assembly comprises embedded braking piston, the fixed stroke piston that sets up, under normal conditions, carries out the global motion for a whole between fixed stroke piston and the braking piston, when the friction is vice to have wearing and tearing, and when the brake oil pressure is greater than the frictional force between the two, then can relative motion between them, thereby the stroke of braking piston carries out corresponding adjustment and realizes the braking.
Description
Technical Field
The utility model relates to a wet brake, concretely relates to vice clearance automatic compensation's of friction wet brake.
Background
The brake is a device having a function of decelerating, stopping, or maintaining a stopped state of a moving member, and performs braking by using a friction principle, and mechanical kinetic energy is converted into heat energy by the brake to be dissipated. The wet brake is mostly in a closed structure, the friction plate works in an oil-immersed closed environment, part of heat generated during braking is absorbed by structural elements of the brake, and most of the heat is taken away by cooling liquid.
At present, wet braking is more and more widely applied, friction pairs of the wet braking are alternately arranged by friction plates at intervals, the oil temperature can be controlled within a certain range due to the fact that the friction plates and the separating plates are oil-cooled, and the friction coefficient of the friction plates cannot change greatly due to the influence of the temperature, so that the wet braking is always in a high-efficiency working state. If the user can change the oil regularly and the cleanliness of the oil can be guaranteed, the friction plate is hardly worn in 5000 hours. However, if the oil is not changed in time or regular oil change maintenance is not carried out, abnormal abrasion of the friction plate and the spacer is inevitable, so that the stroke of the wet brake piston is increased, and the phenomena of overlong stroke of a brake pedal, insufficient braking force, slow braking and the like can occur; the service life of the friction plate is not up to the limit and the friction plate needs to be replaced, so that great waste is caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the wearing and tearing of wet braking friction disc spacer caused the piston stroke too big, the utility model provides a vice clearance automatic compensation arrangement of wet braking friction has solved the not enough of above structure existence.
A wet brake with automatic clearance compensation for a friction pair comprises a half shaft, a spline sleeve and a piston set which are arranged in a shell, and the friction pair is composed of friction plates and separation sheets which are alternately arranged at intervals; the piston group comprises a brake piston and a fixed stroke piston, and the fixed stroke piston is embedded in an inner cavity of the brake piston.
In a further scheme, a stepped hole is formed in the ring surface of the fixed stroke piston, the elastic assembly comprises a limiting bolt and a return spring, the limiting bolt is formed by sequentially connecting a bolt head, a screw rod and a screw seat, and the return spring is sleeved on the periphery of the screw rod and is arranged in a large hole of the stepped hole; the diameter of the screw seat is larger than that of the screw rod and extends outwards to the lower part of the hole wall of the stepped hole for supporting; and the bolt head is provided with an external thread for being in threaded connection with the shell.
In a further scheme, the distance between the screw seat and the end face of the hole wall of the stepped hole is smaller than or equal to the stroke of the brake piston. This ensures that the fixed-stroke piston and the brake piston can be operated in one piece during operation in the initial state (i.e. the unworn state of the friction pair).
According to the further scheme, the outer peripheral surface of the brake piston is in a step shape, small grooves and large grooves are formed in the outer peripheral surface of the step shape respectively, sealing rings are arranged in the small grooves and the large grooves respectively, and an oil inlet cavity is formed between the two sealing rings and the inner hole wall of the shell.
In a further scheme, the fixed stroke piston and the brake piston are in interference fit, so that the fixed stroke piston and the brake piston integrally operate.
In another scheme, the pulling-out force between the fixed stroke piston and the brake piston is larger than the resistance between the two sealing rings and the shell and smaller than the resilience force of the elastic component. The brake piston and the fixed stroke piston can be integrally pulled back to the initial position by the return spring force when no external brake force acts.
In a further scheme, the spline housing is in spline connection with the half shaft and the friction plate respectively, and the friction plate and the spline housing rotate together with the half shaft; the partition is arranged in the inner hole of the shell and moves along the axial direction of the shell.
The half shaft and the spline sleeve are connected through a spline, the spline sleeve and the friction plate are also connected through a spline, the spline connection is a known technology and comprises an inner spline and an outer spline, the inner spline and the outer spline are both multi-tooth parts, the spline on the surface of the inner cylinder is the inner spline, and the spline on the surface of the outer cylinder is the outer spline. The spacer is circumferentially fixed and axially movable along a groove in the outer periphery thereof in cooperation with a corresponding boss extending from the inner bore of the housing of the wet brake. The fixed stroke piston and the brake piston are in interference fit, a step hole is formed in the end face of the ring of the fixed stroke piston, the return spring is installed in a large hole of the step hole in the fixed stroke piston, the bolt head of the limiting bolt sequentially penetrates through the return spring and a small hole in the large hole of the step hole and then is in threaded connection with an internal thread hole in the shell, the screw seat is located outside the step hole, and the screw is used for fixing and compressing the return spring. When the fixed stroke piston moves to the right position, the fixed stroke piston is abutted against the end face of the screw seat, and the fixed stroke piston is limited to continue moving due to the blocking of the screw seat.
When the friction plate and the separating plate are not abraded, oil is fed into the oil inlet cavity to push the brake piston to work, and the brake piston and the fixed stroke piston move synchronously due to interference fit, so that the friction plate and the separating plate are pressed tightly, the rotary motion of a half shaft and a spline sleeve which are connected with the friction plate is limited, and the purpose of service braking is achieved.
When the friction plate and the spacer are abraded, the stroke of the brake piston for driving the fixed stroke piston to synchronously move is insufficient to compress the friction and the spacer, the bottom end face of the hole wall of the stepped hole of the fixed stroke piston is in contact with the screw seat of the limiting bolt, so that the fixed stroke piston is limited, the brake piston continues to move, the friction force between the brake piston and the fixed stroke piston is overcome, the brake piston further compresses the friction plate and the spacer, the rotary motion of a half shaft and a spline sleeve which are connected with the friction plate is limited, and the brake is realized. When the brake is released, the fixed stroke piston drives the brake piston to return under the action of the spring force of the return spring.
The utility model discloses well piston assembly comprises embedded braking piston, the fixed stroke piston that sets up, under normal conditions, carries out the global motion for a whole between fixed stroke piston and the braking piston, when the friction is vice to have wearing and tearing, and when the brake oil pressure was greater than the frictional force between the two, then ability relative motion between them.
The consistency of the travel of the brake pedal is improved, and phenomena such as slow braking and the like caused by abrasion of the friction plate can be avoided. Under the action of the brake oil pressure, the brake piston and the fixed stroke piston can move relatively; after the friction plate and the spacer are worn, the stroke of the brake piston is correspondingly adjusted, and the brake piston is reset through the elastic assembly. Therefore, the effective service life of the middle friction plate is greatly prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention,
figure 2 is a cross-sectional view of a fixed stroke piston of the present invention,
FIG. 3 is a schematic structural view of a limit bolt of the present invention,
figure 4 is a schematic structural diagram of a brake piston in the invention,
1-shell, 2-brake piston, 21-small groove, 22-big groove, 23-inner cavity; 3-spline housing, 4-half shaft, 5-limit bolt, 51-bolt head, 52-screw rod, 53-screw seat; 6-return spring, 7-sealing ring, 8-fixed stroke piston, 81-step hole, 82-excircle, 83-end face, 9-friction plate and 10-spacer.
Detailed Description
As shown in fig. 1-4, a wet brake with automatic clearance compensation for friction pair comprises a half shaft 4, a spline housing 3, a piston set and a friction pair composed of friction plates 9 and separator plates 10 alternately arranged at intervals, wherein an elastic component fixed with a housing 1 penetrates through the piston set at the end part of the friction pair; the piston assembly comprises a brake piston 2 and a fixed-stroke piston 8, the fixed-stroke piston 8 being embedded in an inner chamber 23 of the brake piston 2.
In a further scheme, a stepped hole 81 is formed in the ring surface of the fixed stroke piston 8, the elastic assembly comprises a limiting bolt 5 and a return spring 6, the limiting bolt 5 is formed by sequentially connecting a bolt head 51, a screw rod 52 and a screw seat 53, and the return spring 6 is sleeved on the periphery of the screw rod 52 and is arranged in a large hole of the stepped hole 81; the diameter of the screw seat 53 is larger than that of the screw 52 and extends outwards to the lower part of the hole wall of the stepped hole 81 for supporting; the bolt head 51 is provided with an external thread for threaded connection with the housing 1.
Further, the distance between the screw seat 53 and the hole wall end surface 83 of the stepped hole 81 is smaller than or equal to the stroke of the brake piston 2. This ensures that the fixed-stroke piston and the brake piston can be operated in one piece during operation in the initial state (i.e. the unworn state of the friction pair).
In a further scheme, the outer peripheral surface of the brake piston 2 is step-shaped, a small groove 21 and a large groove 22 are respectively formed in the step-shaped outer peripheral surface, sealing rings 7 are respectively arranged in the small groove 21 and the large groove 22, and an oil inlet cavity is formed between the two sealing rings 7 and the inner hole wall of the shell 1.
In a further scheme, the fixed stroke piston 8 and the brake piston 2 are in interference fit, and the pulling-out force between the fixed stroke piston 8 and the brake piston 2 is greater than the resistance of the two sealing rings and the shell 1 and less than the resilience force of the elastic component.
Namely, the inner cavity 23 of the brake piston 2 is in interference fit with the excircle 82 of the fixed stroke piston 8, and the pull-out force between the inner cavity and the excircle is larger than the resistance between the two sealing rings and the shell and smaller than the spring force of the return spring 6 positioned in the stepped hole 81 of the fixed stroke piston 8; the brake piston 2 and the fixed stroke piston can be integrally pulled back to the initial position by the return spring force when no external braking force acts. I.e. the fixed stroke piston 8 and the brake piston 2 are normally integrated, and when the friction pair is worn and the pressure of the brake oil is greater than the friction force between the two, the two can move relatively.
In a further scheme, the spline housing 3 is in spline connection with the half shaft 4 and the friction plate 9 respectively, and the friction plate 9 and the spline housing 3 rotate together with the half shaft 4; the spacer 10 is provided in an inner hole of the housing 1 and moves in the axial direction of the housing 1.
The half shaft and the spline housing are connected through splines, the spline housing and the friction plate are also connected through splines, and the spacer is matched with a corresponding boss extending out of an inner hole of a shell of the wet brake through a groove on the periphery of the spacer, is circumferentially fixed and can move along the axial direction of the spacer. The fixed stroke piston and the brake piston are in interference fit, a step hole is formed in the end face of the ring of the fixed stroke piston, the return spring is installed in a large hole for fixing the step hole, the bolt head of the limiting bolt sequentially penetrates through the return spring and a small hole which are located in the large hole of the step hole and then is in threaded connection with an internal thread hole in the shell, the screw seat is located outside the step hole, and the screw rod is used for fixing and compressing the return spring.
When the friction plate and the separating plate are not abraded, oil is fed into the oil inlet cavity to push the brake piston to work, and the brake piston and the fixed stroke piston move synchronously due to interference fit, so that the friction plate and the separating plate are pressed tightly, the rotary motion of a half shaft and a spline sleeve which are connected with the friction plate is limited, and the purpose of service braking is achieved.
When the friction plate and the spacer are abraded, the stroke of the brake piston for driving the fixed stroke piston to synchronously move is insufficient to compress the friction and the spacer, the bottom end face of the hole wall of the stepped hole of the fixed stroke piston is in contact with the screw seat of the limiting bolt, so that the fixed stroke piston is limited, the brake piston continues to move, the friction force between the brake piston and the fixed stroke piston is overcome, the brake piston further compresses the friction plate and the spacer, the rotary motion of a half shaft and a spline sleeve which are connected with the friction plate is limited, and the brake is realized. When the brake is released, the fixed stroke piston drives the brake piston to return under the action of the spring force of the return spring.
The utility model discloses well piston assembly is by the embedded brake piston that sets up, fixed stroke piston constitutes, under normal condition, for a whole motion that carries on between fixed stroke piston and the brake piston, when the friction is vice to have wearing and tearing, and when brake oil pressure is greater than the frictional force between the two, then can relative motion between them, the stroke of brake piston carries out corresponding adjustment and then realizes the braking, then carry out the return through elastic component, realized carrying out automatic compensation's purpose because of the clearance that the vice wearing and tearing of friction produced, the braking effect of stopper has been improved, and the effective life of friction disc has been improved.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (7)
1. The utility model provides a vice clearance automatic compensation's of friction wet brake, is including installing in the inside semi-axis (4) of casing (1), spline housing (3), piston group to and the friction pair that constitutes by friction disc (9) and spacer (10) that the interval set up in turn, its characterized in that: an elastic component fixed with the shell (1) is arranged on the piston group at the end part of the friction pair in a penetrating way; the piston group comprises a brake piston (2) and a fixed stroke piston (8), and the fixed stroke piston (8) is embedded in an inner cavity (23) of the brake piston (2).
2. The wet brake of claim 1, wherein: a stepped hole (81) is formed in the ring surface of the fixed stroke piston (8), the elastic assembly comprises a limiting bolt (5) and a return spring (6), the limiting bolt (5) is formed by sequentially connecting a bolt head (51), a screw rod (52) and a screw seat (53), and the return spring (6) is sleeved on the periphery of the screw rod (52) and is arranged in a large hole of the stepped hole (81); the diameter of the screw seat (53) is larger than that of the screw rod (52) and extends outwards to the lower part of the hole wall of the stepped hole (81) for supporting; the bolt head (51) is provided with an external thread for threaded connection with the shell (1).
3. The wet brake of claim 2, wherein: the distance between the screw seat (53) and the hole wall end surface (83) of the stepped hole (81) is smaller than or equal to the stroke of the brake piston (2).
4. The wet brake of claim 1, wherein: the outer peripheral surface of the brake piston (2) is step-shaped, a small groove (21) and a large groove (22) are respectively formed in the step-shaped outer peripheral surface, sealing rings (7) are respectively arranged in the small groove (21) and the large groove (22), and an oil inlet cavity is formed between the sealing rings (7) and the inner hole wall of the shell (1).
5. The wet brake of claim 1, wherein: and the fixed stroke piston (8) and the brake piston (2) are in interference fit.
6. The wet brake of claim 5, wherein: the pulling-out force between the fixed stroke piston (8) and the brake piston (2) is larger than the resistance of the two sealing rings and the shell (1) and smaller than the resilience force of the elastic component.
7. The wet brake of claim 1, wherein: the spline housing (3) is in spline connection with the half shaft (4) and the friction plate (9) respectively, and the friction plate (9) and the spline housing (3) rotate together with the half shaft (4); the spacer (10) is arranged in an inner hole of the shell (1) and moves along the axial direction of the shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921396483.6U CN210715659U (en) | 2019-08-26 | 2019-08-26 | Wet brake with friction pair clearance automatic compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921396483.6U CN210715659U (en) | 2019-08-26 | 2019-08-26 | Wet brake with friction pair clearance automatic compensation function |
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| Publication Number | Publication Date |
|---|---|
| CN210715659U true CN210715659U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921396483.6U Active CN210715659U (en) | 2019-08-26 | 2019-08-26 | Wet brake with friction pair clearance automatic compensation function |
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| CN (1) | CN210715659U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397689A (en) * | 2019-08-26 | 2019-11-01 | 安徽合力股份有限公司 | A kind of wet brake that friction auxiliary air gap compensates automatically |
| CN111692243A (en) * | 2020-06-24 | 2020-09-22 | 徐州徐工矿业机械有限公司 | Multi-piston wet brake of electric drive mining dump truck |
-
2019
- 2019-08-26 CN CN201921396483.6U patent/CN210715659U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397689A (en) * | 2019-08-26 | 2019-11-01 | 安徽合力股份有限公司 | A kind of wet brake that friction auxiliary air gap compensates automatically |
| CN111692243A (en) * | 2020-06-24 | 2020-09-22 | 徐州徐工矿业机械有限公司 | Multi-piston wet brake of electric drive mining dump truck |
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