Lightweight fixed caliper type brake for electric wheel integration

Abstract

The light-weight fixed caliper type brake for electric wheel integration comprises a brake caliper and a brake disc, and the brake caliper comprises an inner caliper body, an outer caliper body, a piston, a communicating oil pipe, an exhaust screw, a caliper reed and a friction lining. The fixed caliper type four-piston design is adopted for the brake, compared with a floating caliper type brake, the pistons push the friction linings to move to clamp the brake disc more stably, return is more flexible, and the brake performance is more stable. The appearance of the brake caliper adopts a hidden screw connection mode, a threaded hole convenient to disassemble is reserved in the piston design, the trend of a communicating oil pipe is optimized, the overall structure is simple, and maintenance and guarantee are convenient. According to the brake, on the basis that the structural strength is guaranteed, all the components are made of new materials for lightweight design, the unsprung mass of an automobile can be effectively reduced after the brake is integrated with an electric wheel, and the running smoothness is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle braking, and in particular relates to a lightweight fixed-caliper brake for electric wheel integration. Background Art

[0002] With the development trend of modern new energy vehicles towards full electrification, intelligence and networking, the development of electric wheel technology that integrates the drive motor into the rim has received increasing attention in the industry in order to fully free up chassis space for battery layout and facilitate intelligent wire-controlled chassis technology. Integrating the drive motor into the rim increases the unsprung mass, which will reduce the vehicle's ride smoothness and maneuverability. Therefore, lightweighting is the most important consideration in the integrated design of electric wheels. As one of the main integrated components on electric wheels, brakes on the current market are mostly floating brakes. The cast iron material they use is heavy, takes up a lot of space, and is cumbersome to maintain. Moreover, after long-term use, the floating pin shaft is covered by external impurities such as mud and sand, which hinders sliding and affects the braking effect. Therefore, there is an urgent need in this field for a lightweight, simple-structured fixed-caliper brake that can be integrated and installed on an electric wheel, while ensuring braking performance, achieving the effects of light weight, simple installation, stable braking performance and convenient maintenance. Summary of the Invention

[0003] (1) Technical issues to be resolved

[0004] The present invention proposes a lightweight fixed-caliper brake for integration with an electric wheel, so as to solve the technical problems of being installed on an electric wheel and being lightweight, easy to maintain and having stable braking performance.

[0005] (2) Technical solution

[0006] In order to solve the above technical problems, the present invention proposes a lightweight fixed-caliper brake for electric wheel integration, which includes a brake caliper and a brake disc; wherein,

[0007] The overall appearance of the brake caliper is a left-right symmetrical four-piston structure, including an inner caliper body, an outer caliper body, a piston, a connecting oil pipe, a caliper oil inlet pipe joint, an exhaust screw, a caliper reed and a friction lining; among them, the outer caliper body and the inner caliper body are connected by multiple screws, and a positioning plane and two symmetrical through holes are respectively provided on both sides of the bottom of the inner caliper body for realizing integrated installation with the electric wheel along the radial direction; conical threaded holes are provided at both ends of the top of the inner caliper body and the outer caliper body, and a double sealing structure of conical sealing and end face sealing is used. The threaded holes at one end of the inner caliper body and the outer caliper body are respectively installed with a caliper oil inlet pipe joint and an exhaust screw, and the threaded holes at the other end are installed with a connecting oil pipe to connect the oil circuit between the inner caliper body and the outer caliper body; two symmetrical piston holes are provided on the outer caliper body and the inner caliper body, and a piston is installed in each piston hole; the friction lining is mounted on the caliper by the friction lining mounting screws, and the caliper reed is pressed against the friction lining by the top screw;

[0008] The brake disc is provided with a plurality of bolt holes evenly distributed along the circumference for installation and fixation with the reduction mechanism on the electric wheel.

[0009] Furthermore, the outer caliper body and the inner caliper body are connected by seven hexagon socket screws, including six symmetrical connecting screws on the left and right and a top screw located in the middle; the positions of the six connecting screws are symmetrically distributed, and the positions of the connecting screws at both ends are in the same straight line with the piston.

[0010] Furthermore, the screw connections on the outer caliper body and the inner caliper body are both designed to be hidden, with screw head countersunk holes being provided on the outer caliper body and the connecting threads being provided on the inner caliper body.

[0011] Furthermore, a pipeline groove for connecting the oil pipe is provided between the two rightmost connecting screws of the inner caliper body and the outer caliper body, so that the pipeline of the connecting oil pipe outside the caliper body is in close contact with the caliper body.

[0012] Furthermore, the piston is a cylindrical structure with a circular chamfer at the bottom of the cylinder and a groove on the side of the cylinder that contacts the friction lining; a piston threaded hole is machined at the bottom of the groove for connecting screws to pull the piston out of the piston hole.

[0013] Furthermore, a sealing groove is provided in each piston hole for installing a rectangular sealing ring to achieve sealing between the piston hole and the piston.

[0014] Furthermore, chamfers are provided at the front and rear of the sealing groove to ensure that the piston avoids cutting the rectangular sealing ring during reciprocating motion. When the brake is pressurized, the sealing ring is deformed and enters the chamfer to maintain the sealing effect. When the brake is finished and the pressure is released, the piston can return to its position with the help of the rebound of the sealing ring.

[0015] Furthermore, the inner caliper body, the outer caliper body and the piston are made of aluminum alloy 7075-T651, and the surface treatment adopts a hard oxidation treatment process.

[0016] Furthermore, the brake disc is made of carbon ceramic material through firing.

[0017] Furthermore, the friction material of the friction lining is made of copper-based powder metallurgy material.

[0018] (3) Beneficial effects

[0019] The present invention proposes a lightweight fixed-caliper brake for integration with an electric wheel, comprising a brake caliper and a brake disc, wherein the brake caliper comprises an inner caliper body, an outer caliper body, a piston, a connecting oil pipe, an exhaust screw, a caliper spring and a friction lining. The brake of the present invention adopts a fixed-caliper four-piston design. Compared with a floating-caliper brake, the piston pushes the friction lining to move and clamp the brake disc more smoothly, the return is more flexible, and the braking performance is more stable. The brake caliper of the present invention adopts a hidden screw connection method, and the piston design reserves threaded holes for easy disassembly, optimizes the direction of the connecting oil pipe, and has a simple overall structure and is convenient for maintenance and maintenance. On the basis of ensuring structural strength, the brake of the present invention uses new materials for lightweight design of each component. After integration with the electric wheel, it can effectively reduce the unsprung mass of the car and improve the smoothness of driving.

[0020] The beneficial effects of the present invention specifically include:

[0021] 1. The brake of the present invention is a fixed-caliper brake, which has a more stable braking effect than a floating-caliper brake and is more convenient for integrated installation on the electric wheel.

[0022] 2. The brake caliper body and piston of the present invention are made of aluminum alloy 7075-T651 and are hard-oxidized to achieve lightweight while effectively ensuring surface strength.

[0023] 3. The mounting screws of the brake caliper in the present invention all adopt a hidden screw design, which has a beautiful appearance and can reduce the risk of the screws being oxidized by water.

[0024] 4. The positions of the connecting screws on the brake caliper of the present invention are symmetrically distributed, and the positions of the screws at both ends are in the same straight line as the piston position, so that the stress on the screws during the movement of the piston is mainly tensile stress, optimizing the force condition of the caliper connecting screws.

[0025] 5. The brake disc of the present invention uses carbon ceramic material. Compared with traditional brake discs, it can still maintain a stable friction coefficient at high temperatures, is lighter in weight, and has strong wear resistance and corrosion resistance.

[0026] 6. The brake caliper of the present invention has a unique piston sealing structure design, which can avoid the phenomenon of ring cutting caused by piston movement and fully ensure the sealing performance of the piston.

[0027] 7. The mounting bolts of the present invention are arranged on the inner caliper body, which facilitates the disassembly of the caliper. The threaded holes are arranged on the piston, which facilitates the disassembly of the piston and simplifies the maintenance of the brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an assembly diagram of the lightweight fixed-caliper brake for integrated electric wheel of the present invention;

[0029] Figure 2a This is the front view of the brake caliper in the present invention, Figure 2b It is a top view;

[0030] Figure 3a This is the main view of the outer clamp body of the present invention. Figure 3b is the rear view, Figure 3c This is a partial cross-sectional view of the mounting hole when viewed from above. Figure 3d This is a full cross-sectional view looking downwards. Figure 3e is a side view;

[0031] Figure 4a This is the main view of the inner clamp body in the present invention. Figure 4b is the rear view, Figure 4c This is a partial cross-sectional view of the mounting hole when viewed from above. Figure 4d This is a full cross-sectional view looking downwards. Figure 4e is a side view;

[0032] Figure 5 Schematic diagram of the piston structure in the present invention;

[0033] Figure 6 Schematic diagram of the piston sealing groove structure in the caliper body of the present invention;

[0034] Figure 7 This is a schematic diagram of the brake disc structure of the present invention.

[0035] In the figure: 1-brake caliper; 2-brake disc; 3-inner caliper body; 4-outer caliper body; 5-piston; 6-rectangular sealing ring; 7-caliper spring; 8-connecting screw; 9-friction lining mounting screw; 10-top screw; 11-caliper oil inlet pipe joint; 12-exhaust screw; 13-friction lining; 14-connecting oil pipe; 15-screw head countersunk hole; 16-tapered threaded hole; 17-symmetrical through hole; 18-positioning plane; 19-piston threaded hole; 20-sealing groove chamfer. DETAILED DESCRIPTION

[0036] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0037] This embodiment proposes a lightweight fixed-caliper brake for electric wheel integration, the overall structure of which is as follows: Figure 1As shown, it includes a brake caliper 1 and a brake disc 2.

[0038] The overall shape of the brake caliper 1 is a bilaterally symmetrical four-piston structure, including an inner caliper body 3, an outer caliper body 4, a piston 5, a connecting oil pipe 14, an exhaust screw 12, a caliper spring 7 and a friction lining 13. Figure 2a and 2b shown.

[0039] The structure of the outer clamp body 4 is as follows Figures 3a to 3e As shown, the structure of the inner clamp body 3 is as follows Figures 4a to 4e As shown. The connection strength between the outer caliper body 4 and the inner caliper body 3 is ensured by seven hexagon socket screws, including six symmetrical connecting screws 8 and a top screw 10 located in the center. The screw connections are all concealed, with screw head countersunk holes 15 provided on the outer caliper body 4 and the connecting threads provided on the inner caliper body 3. To optimize the stress conditions of the brake caliper, the six connecting screws 8 are symmetrically distributed, and the connecting screws 8 at both ends are aligned with the position of the piston 5, so that the stress on the connecting screws 8 during the movement of the piston 5 is mainly tensile.

[0040] Positioning planes 18 and two symmetrical through holes 17 are provided on both sides of the bottom of the inner caliper body 3 for achieving integrated installation with the electric wheel in the radial direction and facilitating disassembly.

[0041] Conical threaded holes 16 are provided at both ends of the top of the inner and outer caliper bodies 3, 4, utilizing a dual-seal structure combining a conical seal and an end-face seal. The caliper oil inlet pipe connector 11 and the bleed screw 12 are mounted on one end of the threaded holes 16, respectively, while the connecting oil pipe 14 is mounted on the other end of the threaded holes 16, providing oil communication between the inner and outer caliper bodies 3, 4. A conduit groove for the connecting oil pipe 14 is provided between the two rightmost connecting screws 8 on the inner and outer caliper bodies 3, 4. This allows the connecting oil pipe 14 to run outside the caliper body in a manner that conforms to the caliper body, saving space while also protecting the pipe.

[0042] There are two symmetrical piston holes on the outer caliper body 4 and the inner caliper body 3, and a piston 5 is installed inside each piston hole. The piston 5 is a cylindrical structure. Figure 5 As shown, in order to facilitate installation, a circular chamfer is provided at the bottom of the cylinder, and a groove is provided on the side of the cylinder that contacts the friction lining 13 to reduce weight; in order to facilitate disassembly, a piston threaded hole 19 is processed at the bottom of the groove for connecting screws to pull the piston 5 out of the piston hole.

[0043] Each piston hole is provided with a sealing groove for installing a rectangular sealing ring 6 to achieve sealing between the piston hole and the piston 5. The sealing groove structure is as follows Figure 6As shown, a chamfer 20 is provided in front and behind the sealing groove to ensure that the piston 5 does not cut the rectangular sealing ring 6 during the reciprocating motion. When the brake is pressurized, the sealing ring 6 is deformed and enters the chamfer 20 to maintain the sealing effect. When the brake is finished and the pressure is released, the piston 5 can return to its original position with the help of the rebound of the sealing ring 6.

[0044] In order to balance the lightweight and surface strength of the brake caliper 1, the inner caliper body 3, the outer caliper body 4 and the piston 5 are made of aluminum alloy 7075-T651, and the surface treatment adopts a hard oxidation treatment process.

[0045] The brake disc 2 is in the shape of a circular disc and has a structure as follows: Figure 7 For weight reduction, the material is made of carbon ceramic material through sintering. The brake disc 2 is provided with 12 bolt holes evenly distributed along the circumference for installation and fixation with the reduction mechanism on the electric wheel.

[0046] The friction lining 13 is mounted on the caliper using two friction lining mounting screws 9, and the caliper spring 7 is pressed against the friction lining 13 using the top screw 10 to prevent the friction lining 13 from vibrating and making unusual noises when not in use. To match the brake disc 2 made of carbon ceramic, the friction material of the friction lining 13 is made of copper-based powder metallurgy.

[0047] The specific manner in which the lightweight fixed-caliper brake of the present invention realizes its function is as follows:

[0048] The brake caliper is integrated with the electric wheel in the radial direction through two symmetrical through holes 17 on the inner caliper body 3. The brake disc 2 is installed and fixed to the deceleration mechanism on the electric wheel through 12 bolt holes evenly distributed along the circumference. The caliper oil inlet pipe joint 11 is connected to the hydraulic pipeline in the vehicle and serves as the oil inlet of the brake. When installed on the vehicle, the caliper oil inlet pipe joint 11, the exhaust screw 12 and the connecting oil pipe 14 should be tightened to prevent hydraulic oil leakage.

[0049] When the vehicle brakes, hydraulic oil enters the inner caliper body 3 from the caliper oil inlet pipe joint 11, passes through the inside of the caliper, and enters the outer caliper body 4 from the inner caliper body 3 through the connecting oil pipe 14. The hydraulic pressure on both sides remains consistent. The hydraulic oil simultaneously pushes the piston 5 at the piston grooves of the inner caliper body 3 and the outer caliper body 4. The movement of the piston 5 causes the rectangular sealing ring 6 to enter the sealing groove chamfer 20, maintaining a good seal. The piston 5 pushes the friction lining 13 forward, and the two friction linings 13 clamp the brake disc 2 to brake. When the brake system is depressurized and the brake is released, the hydraulic oil in the brake caliper 1 flows back to the tank, and the rectangular sealing ring 6 rebounds, driving the piston 5 back to its original position.

[0050] When there is gas in the hydraulic pipeline and it needs to be exhausted, it is necessary to loosen the exhaust screw 12 counterclockwise while keeping the brake on. Liquid and bubbles will emerge from the outlet of the exhaust screw 12. When there are no bubbles in the liquid emerging from the exhaust screw 12, tighten the exhaust screw 12 to complete the exhaust.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A lightweight fixed-caliper brake for electric wheel integration, characterized in that: The electric wheel integrated lightweight fixed caliper brake comprises a brake caliper and a brake disc; wherein, The overall shape of the brake caliper is a bilaterally symmetrical four-piston structure, including an inner caliper body, an outer caliper body, a piston, a connecting oil pipe, a caliper oil inlet pipe joint, an exhaust screw, a caliper reed and a friction lining; wherein the outer caliper body and the inner caliper body are connected by multiple screws, and a positioning plane and two symmetrical through holes are respectively provided on both sides of the bottom of the inner caliper body for realizing integrated installation with the electric wheel in the radial direction; conical threaded holes are provided at both ends of the top of the inner caliper body and the outer caliper body, and a double sealing structure of conical sealing and end face sealing is used. The threaded holes at one end of the inner caliper body and the outer caliper body are respectively installed with a caliper oil inlet pipe joint and an exhaust screw, and the threaded holes at the other end are installed with a connecting oil pipe to connect the oil circuit between the inner caliper body and the outer caliper body; two symmetrical piston holes are provided on the outer caliper body and the inner caliper body, and a piston is installed in each piston hole; the friction lining is mounted on the caliper by the friction lining mounting screws, and the caliper reed is pressed against the friction lining by the top screw; The brake disc is provided with a plurality of bolt holes evenly distributed along the circumferential direction for achieving installation and fixation with the speed reduction mechanism on the electric wheel.

2. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, characterized in that: The outer caliper body and the inner caliper body are connected by seven hexagon socket screws, including six symmetrical connecting screws and a top screw located in the middle; the six connecting screws are symmetrically distributed, and the connecting screws at both ends are in the same straight line with the piston.

3. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, wherein: The screw connections on the outer and inner jaw bodies are both designed to be concealed. Screw head countersunk holes are provided on the outer jaw body, and the connecting threads are all provided on the inner jaw body.

4. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, wherein: A pipeline groove for connecting the oil pipe is provided between the two rightmost connecting screws of the inner caliper body and the outer caliper body, so that the pipeline of the connecting oil pipe outside the caliper body is in close contact with the caliper body.

5. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, wherein: The piston is a cylindrical structure with a circular chamfer at the bottom of the cylinder and a groove on the side of the cylinder that contacts the friction lining; a piston threaded hole is machined at the bottom of the groove for connecting screws to pull the piston out of the piston hole.

6. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, wherein: A sealing groove is provided in each piston hole for installing a rectangular sealing ring to achieve sealing between the piston hole and the piston.

7. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 6, characterized in that: The front and rear of the sealing groove are respectively provided with chamfers to ensure that the piston avoids cutting the rectangular sealing ring during the reciprocating motion. When the brake pressure is applied, the sealing ring is deformed and enters the chamfer to maintain the sealing effect. When the braking is completed and the pressure is released, the piston can return to its position with the help of the rebound of the sealing ring.

8. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, wherein: The inner caliper body, the outer caliper body and the piston are made of aluminum alloy 7075-T651, and the surface treatment adopts a hard oxidation treatment process.

9. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 1, wherein: The brake disc is made of carbon ceramic material.

10. The lightweight fixed-caliper brake for an electric wheel assembly according to claim 9, characterized in that: The friction material of the friction lining is copper-based powder metallurgy material.

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