Fixed caliper disc brake with parking function

Abstract

The application provides a fixed caliper disc brake with a parking function, comprising a driving unit, a parking pressure building unit, a caliper body, a piston and a friction block; the parking unit is used for providing a parking power output when a vehicle sends a parking signal; the parking unit outputs a driving torque; the driving unit is installed on the caliper body; the parking pressure building unit is connected with the driving unit; the driving unit outputs a driving torque through the parking pressure building unit; the caliper body comprises a caliper side and a caliper back side, the caliper back side is provided with an axial parking cavity, the parking cavity is communicated with an upper piston cavity and a lower piston cavity of the caliper body; the parking pressure building unit comprises a parking piston, the parking piston is installed in the parking cavity, under the driving of the driving unit, the parking piston pressurizes brake fluid in the parking cavity so as to pressurize a brake piston and realize the parking function. The brake has the advantages of compact structure, light weight and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brake, in particular to a fixed caliper disc brake with parking function. BACKGROUND

[0002] The fixed caliper disc brake has become one of the mainstream development directions of new energy vehicle brake due to its large loadable braking torque, fast response time and stable braking, etc. However, the fixed caliper brake on the market usually only has the function of service brake, lacking the function of parking brake, such as Chinese patent CN201210432204.3 - an improved double yoke plate fixed caliper disc brake. The vehicle parking brake also needs to be equipped with a separate parking mechanism. This increases the cost of new components and related installation process, increases the weight of the chassis and reduces the vehicle's range. SUMMARY

[0003] The present application provides a fixed caliper disc brake with parking function according to the problems of the prior art.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] A fixed caliper disc brake with parking function, comprising a driving unit, a parking pressure building unit, a caliper body, a piston and a friction block;

[0006] The parking unit is used to provide parking power output when the vehicle sends a parking signal. The parking unit outputs a driving torque; the driving unit is installed on the caliper body;

[0007] The parking pressure building unit is connected to the driving unit, and the driving unit outputs a driving torque through the parking pressure building unit;

[0008] The caliper body includes a caliper side and a caliper back side, and the caliper back side is provided with an axial parking cavity, which is in communication with the upper piston cavity and the lower piston cavity of the caliper body;

[0009] The parking pressure building unit includes a parking piston, which is installed in the parking cavity. Under the driving of the driving unit, the parking piston pressurizes the brake fluid in the parking cavity to pressurize the brake piston and realize parking.

[0010] As a preferred, the parking pressure building unit includes a driving shaft, a parking piston, a sealing bowl, a roller plane bearing, a limiting baffle, a clasp spring and a buckle;

[0011] The driving shaft is a transmission shaft member with a "cross" structure feature. The uppermost end is designed as an external gear structure feature, which forms a gear matching relationship with the driving unit to transmit driving torque. The middle section is designed as a rectangular boss structure. The upper end of the boss is supported on a roller plane bearing. A rectangular limiting groove is designed on the upper end of the boss to embed a clamp to limit the axial freedom of the driving shaft. An external thread structure is designed on the lowermost end of the driving shaft to match with the internal thread of the parking piston to form a threaded connection mode to transmit driving force.

[0012] As a preferred, the parking piston is a cylindrical structure member. The upper end is designed as a hollow structure. An internal thread is pre-set on the inner wall of the cylindrical section to form a threaded matching connection with the external thread of the driving shaft. The driving shaft is embedded in the parking piston. The cross section of the parking cavity is elliptical. The middle and lower end of the parking piston is designed as an "elliptical" boss structure to match with the elliptical cross section of the parking cavity of the clamp body. A circular annular groove structure is designed on the lower end of the parking piston to assemble a sealing bowl component.

[0013] As a preferred, the sealing bowl is an elliptical ring structure as a whole. A slot with a "U" shaped cross section is arranged on the lower end surface along the trajectory.

[0014] As a preferred, a roller plane bearing is designed on the upper end surface of the rectangular boss structure of the driving shaft. The bearing is a bearing member arranged in an upper and lower structure form, including an upper ring, rollers and a lower ring. The upper ring is tightly attached to the support surface of the baffle. The lower ring is assembled with the driving shaft limiting platform and rotates together with the driving shaft. A plurality of rollers are arranged in the middle.

[0015] As a preferred, the limiting baffle is an elliptical body structure with the same cross section as the parking cavity. A clamp spring is designed on the upper surface of the limiting baffle. The clamp spring is a sheet metal member with an open elliptical contour and a rectangular cross section, which is embedded in the groove of the parking cavity wall.

[0016] As a preferred, a clamp is further designed on the upper end of the limiting baffle. The clamp is a sheet metal member with an open circular contour and internal teeth. The outer end of the clamp is supported on the limiting baffle. The inner end is nested in the groove structure of the driving shaft with a certain assembly gap. When the driving unit is reversed, the clamp provides a reverse support force for the driving shaft.

[0017] As a preferred, the overall shape of the clamp body is designed as a "mouth" shape. A cylindrical groove is designed on the upper and lower ends of the clamp body respectively, and a piston and a rectangular sealing ring are nested to form a piston cavity. The connecting clamp body upper and lower end structure is a side beam on both sides of the clamp body. A weight reduction groove is designed on the side beam. An installation block for the service brake oil inlet is designed in the upper and lower weight reduction grooves respectively. A service brake oil channel and a parking brake oil channel are designed in the clamp body. The parking oil channel part borrows the service brake oil channel.

[0018] As preferred, the outer wall surface of the parking cavity is designed with left-right symmetrical return spring mounting bosses, the return spring mounting bosses are triangular profile boss structures in cross section, wherein the surface for fixing the return spring is a fixed surface, and the fixed surface is a boss inclined surface.

[0019] As preferred, the inner side of the clamp body is designed with a friction block limiting impact boss, a limiting screw mounting circular table is designed at the lower part of the clamp back side, and the limiting screw passes through the friction block limiting groove; the return spring is a single sheet metal spring structure, the structure profile is in the shape of "W", the middle empty block is assembled on the mounting boss, and the two sides are V-shaped for storing elastic potential energy and exerting return elastic force.

[0020] The scheme has the following beneficial effects:

[0021] The scheme designs a fixed clamp disc brake with a parking function, which not only has a service brake function but also has a parking function. The service brake and the parking brake share the same clamp body, so that the additional parking mechanism of the automobile chassis is reduced, the part cost and the installation process cost are reduced. On the other hand, the weight of the automobile chassis is also reduced, and the vehicle cruising range is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view of the overall structure of the brake.

[0023] Figure 2 is a schematic view of the overall structure of the brake.

[0024] Figure 3 is Figure 1 a top view.

[0025] Figure 4 is Figure 3 a sectional view.

[0026] Figure 5 is Figure 3 a sectional view.

[0027] Figure 6 is Figure 5 a local enlarged view of

[0028] Figure 7 is a schematic view of the structure of the clamp body.

[0029] Figure 8 is a schematic view of the structure of the brake oil passage.

[0030] The reference signs in the drawings correspond to the following technical names:

[0031] 1-driving unit, 2-pressing unit, 3-caliper body, 4-piston cavity, 5-friction block, 6-caliper side, 7-caliper back side, 8-parking cavity, 9-parking piston, 10-return spring, 11-driving shaft, 12-sealing bowl, 13-roller plane bearing, 14-limiting baffle, 15-clasp spring, 16-clasp, 17-outer gear structure, 18-limiting boss, 19-hollow structure, 20-groove, 21-upper ring, 22-lower ring, 23-roller, 24-side beam, 25-weight reduction groove, 26-oil inlet mounting block, 27-parking oil channel, 28-threaded mounting hole, 30-mounting boss, 31-limiting impact boss, 32-brake oil channel. DETAILED DESCRIPTION

[0032] Embodiment 1

[0033] A fixed caliper disc brake with parking function, comprising a driving unit 1, a parking pressure building unit 2, a caliper body 3, a piston, and a friction block 5.

[0034] The parking unit is used to provide parking power output when the vehicle sends a parking signal. The parking unit outputs a driving torque; the driving unit 1 is installed on the caliper body 3.

[0035] The parking pressure building unit 2 is connected to the driving unit 1, and the driving unit 1 outputs a driving torque through the parking pressure building unit 2.

[0036] The caliper body 3 comprises a caliper side 6 and a caliper back side 7, and the caliper back side 7 is provided with an axial parking cavity 8 which is in communication with an upper piston cavity 4 and a lower piston cavity 4 of the caliper body 3; the outer shell of the parking cavity 8 is defined as a parking brake cylinder which is part of the caliper body 3.

[0037] The parking pressure building unit 2 comprises a parking piston 9 which is installed in the parking cavity 8. Under the driving of the driving unit 1, the parking piston 9 pressurizes brake fluid in the parking cavity 8 to realize pressurization of a brake piston and achieve a parking function.

[0038] The brake further comprises a driving unit 1, a parking pressure building unit 2, a caliper body 3, a piston, a friction block 5, a brake disc, a positioning pin, a return spring 10, a deflation screw, a dust cover and other components.

[0039] The driving unit 1 provides parking power output when the vehicle sends a parking signal, and the driving unit 1 outputs a driving torque.

[0040] The parking pressure building unit 2 is connected to the driving unit 1 through a gear to transmit a driving torque of the driving unit 1. The parking pressure building unit 2 comprises a driving shaft 11, a parking piston 9, a sealing bowl 12, a roller plane bearing 13, a limiting baffle 14, a clasp spring 15, a clasp 16 and other components.

[0041] The driving shaft 11 is a transmission shaft member with a "cross" structure feature; the "cross" shape refers to a cross-shaped section. The uppermost end is designed as an external gear structure 17, which forms a gear matching relationship with the driving unit 1 to transmit the driving torque; the middle section is designed as a limiting boss 18, the upper end of the oval boss is supported on the roller plane bearing 13, a rectangular limiting groove is designed at the upper end of the oval boss to embed the clamp to limit the axial freedom of the driving shaft; the lowermost end of the driving shaft 11 is designed with an external thread structure, which matches with the internal thread of the parking piston 9 to form a threaded connection mode to transmit the driving force.

[0042] The parking piston 9 is a cylindrical structure member. The upper end is designed as a hollow structure 19, and the internal thread is pre-set in the inner wall of the cylindrical section to form a threaded matching connection relationship with the external thread of the driving shaft 11 to transmit the driving force; the driving shaft 11 is nested in the parking piston 9, which saves the structure arrangement space and is convenient for the narrow space arrangement requirement of the parking cavity 8 of the plier body 3. The middle and lower ends of the parking piston 9 are designed as an "oval" boss structure, which matches with the oval section of the parking cavity 8 of the plier body 3 to constrain the rotational freedom of the piston and only keep its axial sliding freedom, so as to convert the driving torque output by the driving unit 1 into the sliding force of the parking piston 9, realizing the conversion of the load form from rotation to sliding. A circular ring groove structure is designed at the lower end of the parking piston 9 to assemble the sealing bowl 12 component to seal the brake fluid in the parking cavity 8.

[0043] The sealing bowl 12 is an oval ring structure, and the lower end face of the sealing bowl 12 is provided with a "U"-shaped notch 20 along the track. When the parking cavity 8 starts to build pressure, the liquid builds pressure on the concave surface of the sealing bowl 12, so that the "U-shaped opening" is opened and tightly attached to the piston and the wall surface of the parking cavity 8, forming a sealing effect on the brake fluid.

[0044] The roller plane bearing 13 is designed on the upper end face of the rectangular boss structure of the driving shaft 11, which is a bearing member arranged in an upper and lower structure, including an upper ring 21, a roller 23, a lower ring 22 and other components. The upper ring 21 is tightly attached to the support surface of the limiting baffle 14, and the lower ring 22 is assembled with the limiting platform of the driving shaft 11 and rotates with the driving shaft 11. A plurality of rollers 23 are arranged in the middle to convert the sliding friction between the upper ring 21 and the lower ring 22 into rolling friction, which reduces the influence of friction resistance and also plays an axial supporting role for the driving shaft 11.

[0045] Wherein, in the upper part of the roller plain bearing 13 design limit baffle 14, for an elliptical body structure, axial stiffness is large. In the upper limit baffle 14 design has a snap spring 15, for a non-closed oval profile, rectangular section sheet metal parts, has good radial elasticity, can be compressed radially to facilitate nesting in the wall cavity 8 of the pincers 3 recess. Limit baffle 14 and snap spring 15, form the limit support effect when the drive shaft 11 parking brake. In the upper end of the limit baffle 14 is also designed to have a clamp, for a non-closed circular profile, with internal tooth type sheet metal parts, has radial elasticity, axial support effect. Clamp outer end support in the limit baffle 14, nested in the drive shaft 11 groove structure, and has a certain assembly gap, when the drive unit 1 reverse, for the drive shaft 11 provides reverse support force.

[0046] The outer periphery of the parking pressure building unit 2 is the pincers 3. The pincers 3 overall design is "mouth" shape. Its upper and lower end are designed with cylindrical groove, and nested piston, rectangular seal ring to form the piston cavity 4. The inner side of the upper end is designed with two installation arms, which are arranged with mounting holes and fixed on the chassis steering knuckle through bolts, to fix the brake. At the same time, the installation arm is designed with "ladder" reinforcement structure, which can improve the stiffness performance of the arm. The structure connecting the upper and lower ends of the pincers 3 is the side beam 24 of the pincers 3, which is used to connect and support the stress deformation of the upper and lower ends of the pincers 3. Three lightening grooves 25 are designed on the side beam 24, which can reduce the weight of the pincers 3 without affecting the rigid deformation of the pincers 3, and reduce the cost of structural parts. In particular, the parking brake oil inlet mounting block 26 is designed in the upper and lower lightening grooves 25, which are arranged symmetrically. The parking brake oil channel 32 is designed in the pincers 3, one end of the parking oil channel 27 is arranged at the bottom of the parking cavity 8, and the other end is connected to the lower piston cavity 4. The parking oil channel 27 part of the parking oil channel borrows the parking brake oil channel 32, which has compact structure and high efficiency. Compared with the external design of oil pipe, the internal oil channel scheme does not need installation process, and has high safety and reliability. The parking brake cylinder structure is designed in the middle neutral position of the pincers 3, which is assembled with the parking pressure building unit 2 to form the parking brake function. Two parking oil channels 27 are arranged at the bottom of the cylinder body, which are connected with the piston cavity 4 to form the parking liquid flow pipeline. The limit baffle 14 mounting groove and the snap spring 15 mounting groove are designed in the upper end of the parking cylinder of the pincers 3, to assemble the limit baffle 14 and the snap spring 15.

[0047] The drive unit 1 mounting platform is also designed on the upper end face of the pincers 3, and two threaded mounting holes 28 are designed at the edge, which are connected by bolts to fix the parking drive unit 1 on the pincers 3.

[0048] The left and right symmetric return spring 10 mounting boss 30 is designed on the outer wall surface of the parking cylinder of the pincers 3, which is a triangular profile boss structure with high stiffness, and is assembled with the return spring 10 to realize the return function of the friction block 5 after the brake ends.

[0049] The inside of the caliper body 3 is designed with a friction block 5 limit impact boss 31, which can limit the rotation degree of freedom of the friction block 5, bear the braking torque, and realize the braking performance. A limit screw mounting circular table is designed at the lower part of the outside to constrain the limit screw. The limit screw passes through the friction block 5 limit groove to realize the limiting effect of the friction block 5.

[0050] The return spring 10 is a single sheet metal spring structure, the structure profile is "W" shape, the middle empty block is assembled on the caliper body 3 mounting boss 30, and the two sides V-shaped are used for storing elastic potential energy to exert the return elastic force.

[0051] The principle of realizing the parking function is as follows:

[0052] When the vehicle sends a parking signal, the drive unit 1 outputs torque, which is transmitted to the parking pressure building unit 2 through the gear. The drive shaft 11 in the parking pressure building unit 2 rotates and is transmitted to the parking piston 9 through the threaded connection. Since the parking piston 9 and the parking cavity 8 are both designed in an elliptical profile structure, the rotation degree of freedom is constrained, and the rotation torque of the drive shaft 11 is converted into the sliding energy of the parking piston 9. At the same time, the drive shaft 11 is supported on the limit baffle 14 and the snap spring 15 to ensure that it has axial support force. The parking piston 9 slides downward to compress the brake fluid in the parking cavity 8 to build pressure of the parking brake fluid. The high-pressure parking fluid enters the outer piston cavity 4 through the two parking oil channels 27 at the bottom of the parking cavity 8, and builds brake pressure on the outer piston, which in turn extrudes the outer friction block 5 to feed it to the brake disc. When the disc surface brake clearance is eliminated, the outer friction block 5 extrudes the brake disc, and under the action of friction, the outer side surface of the brake disc is parked.

[0053] At the same time, the high-pressure parking brake fluid entering the outer piston cavity 4 enters the inner piston cavity 4 through the internal driving brake pipeline of the caliper body 3, and then builds brake pressure on the inner piston, which extrudes the inner friction block 5 to feed it to the brake disc. When the disc surface brake clearance is eliminated, the inner friction block 5 extrudes the brake disc, and under the action of friction, the inner side surface of the brake disc is parked.

[0054] When the vehicle parking signal is released, the drive unit 1 outputs reverse torque, which drives the drive shaft 11 of the parking unit to reverse through the gear connection. The drive shaft 11 drives the parking piston 9 to slide reversely, the parking piston 9 releases the liquid pressure of the parking cavity 8, and then the brake fluid pressure of the parking cavity 8 and the piston cavity 4 is released, and flows back with the reverse movement of the piston. Then the piston returns under the pulling action of the rectangular sealing ring. The elastic potential energy of the return spring 10 is released, and the friction block 5 is separated from the brake disc under the action of the elastic force, realizing the parking release effect.

[0055] The principle of realizing the driving brake is as follows:

[0056] The high pressure brake fluid from outside enters the inner piston cavity 4 through the oil inlet of the caliper body 3, forms the service brake pressure on the inner piston, and pushes the inner piston to extrude the inner friction block 5 to feed the brake disc. When the gap between the disc surfaces is eliminated, the inner friction block 5 extrudes the brake disc, and due to the friction force, the inner side braking torque is formed on the brake disc. At the same time, the high pressure brake fluid entering the inner piston cavity 4 enters the outer piston cavity 4 through the internal oil passage of the caliper body 3, and forms the braking torque acting on the brake disc from the outside.

Claims

1. A fixed caliper disc brake with parking function, characterized in that: Includes a drive unit (1), a parking pressure building unit (2), a clamp (3), a piston, and a friction block (5); The parking unit is used to provide parking power output. When the vehicle issues a parking signal, the parking unit outputs drive torque. The drive unit (1) is mounted on the clamp body (3); The parking pressure building unit (2) is connected to the drive unit (1), and the drive unit (1) outputs driving torque through the parking pressure building unit (2); The clamp body (3) includes a jaw side (6) and a back side (7). The back side (7) is provided with an axial parking chamber (8). The parking chamber (8) is connected to the upper piston chamber (4) and the lower piston chamber (4) of the clamp body (3). The parking pressure building unit (2) includes a parking piston (9), which is installed in the parking chamber (8). Under the drive of the drive unit (1), the parking piston (9) pressurizes the brake fluid in the parking chamber (8) to achieve the parking function by pressurizing the brake piston. The parking pressure building unit (2) includes a drive shaft (11), a parking piston (9), and a roller bearing (13). Among them, the drive shaft (11) is a transmission shaft with a cross-shaped structure; the uppermost part is designed with an external gear structure (17) to form a gear engagement relationship with the drive unit (1) and transmit driving torque; the middle section is designed with a rectangular boss structure, the upper part of the boss is supported on the roller plane bearing (13), and a rectangular limiting groove is designed on the upper part of the boss to limit the axial freedom of the drive by nested clamps; the lowermost part of the drive shaft (11) is designed with an external thread structure to engage with the internal thread of the parking piston (9) to form a threaded connection and transmit driving force. The overall outline of the clamp body (3) is designed as a "mouth" shape, with cylindrical grooves designed at its upper and lower ends, and a piston and a rectangular sealing ring nested therein to form a piston cavity (4).

2. A fixed caliper disc brake with parking function according to claim 1, characterized in that: It also includes a sealing bowl (12), and the parking piston (9) is a cylindrical structure. The upper end is designed as a hollow structure (19), and an internal thread is preset on the inner wall of the cylindrical section to form a threaded connection with the external thread of the drive shaft (11). The drive shaft (11) is nested in the parking piston (9), and the cross section of the parking cavity (8) is elliptical. The middle and lower end of the parking piston (9) is designed as an "elliptical" boss structure to form a fit with the elliptical cross section of the parking cavity (8) of the clamp body (3). The lower end of the parking piston (9) is designed with an annular groove structure to assemble the sealing bowl (12) component.

3. A fixed caliper disc brake with parking function according to claim 2, characterized in that: The sealing bowl (12) is an elliptical ring structure, and the lower end face is provided with a "U" shaped groove (20) along its trajectory.

4. A fixed caliper disc brake with parking function according to claim 1, characterized in that: A roller plane bearing (13) is designed on the upper end face of the rectangular boss structure of the drive shaft (11). The bearing is a bearing component arranged in an upper and lower structure, including an upper ring (21), rollers (23) and a lower ring (22). The upper ring (21) is in close contact with the baffle support surface, and the lower ring (22) is assembled with the limiting platform of the drive shaft (11) and rotates together with the drive shaft (11); multiple rollers (23) are arranged in the middle.

5. A fixed caliper disc brake with parking function according to claim 4, characterized in that: The upper part of the roller flat bearing (13) is designed with a limit baffle (14). The limit baffle (14) is an elliptical rotating body structure with the same cross section as the parking cavity (8). A retaining ring (15) is designed on the upper part of the limit baffle (14). The retaining ring (15) is a sheet metal part with an open elliptical profile and a rectangular cross section, which is embedded in the groove of the parking cavity (8) wall.

6. A fixed caliper disc brake with parking function according to claim 5, characterized in that: A clamp is designed at the upper end of the limiting baffle (14). The clamp is a non-closed circular outline with a sheet metal part with internal teeth. The outer end of the clamp is supported on the limiting baffle (14), and the inner end is nested in the groove structure of the drive shaft (11) with a certain assembly gap. When the drive unit (1) reverses, it provides reverse support force to the drive shaft (11).

7. A fixed caliper disc brake with parking function according to claim 1, characterized in that: The upper and lower end structures of the connecting clamp body (3) are the side beams (24) on both sides of the clamp body (3). A weight reduction groove (25) is designed on the side beam (24). A service brake oil inlet mounting block (26) is designed in the upper and lower weight reduction grooves (25). A service brake oil passage (32) and a parking brake oil passage (32) are designed in the clamp body (3). The parking brake oil passage (27) partially borrows from the service brake oil passage (32).

8. A fixed caliper disc brake with parking function according to claim 1, characterized in that: The outer wall of the parking cavity (8) is designed with a left-right symmetrical return spring (10) mounting boss (30). The return spring (10) is mounted on the boss (30). The boss (30) has a triangular profile boss structure in cross section. The surface that fixes the return spring (10) is the fixed surface, which is the inclined surface of the boss.

9. A fixed caliper disc brake with parking function according to claim 8, characterized in that: The inner side of the clamp body (3) is designed with a friction block (5) limiting impact boss (31). A limiting screw mounting round platform is designed on the lower part of the clamp back side (7). The limiting screw passes through the limiting groove of the friction block (5). The return spring (10) is a single sheet metal spring structure with a "W" shape in the outline. The middle gap is assembled on the mounting boss (30), and the V-shaped sides are used to store elastic potential energy and apply return force.

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