Rolling return brake

Abstract

The present application relates to the technical field of braking, in particular to a rolling return brake. The brake comprises a shell body and a driving unit; the driving unit is connected with the shell body; a brake pad assembly is connected with the driving unit; the driving unit is used to drive the brake pad assembly to move from an initial position to a braking position; a first return assembly comprises a return unit and a limiting unit; the limiting unit is connected with the shell body, and the gap between at least part of the limiting unit and the brake pad assembly gradually decreases along the driving direction of the driving unit; one end of the return unit is connected with the brake pad assembly, and the other end is abutted with the limiting unit; the braking state comprises that the driving unit drives the brake pad assembly to move to the braking position, and the return unit is extruded by the limiting unit to store energy; the return state comprises that the return unit releases energy, drives the abutted place between the return unit and the limiting unit to roll along the limiting unit, thereby driving the brake pad assembly to move to the initial position. Thus, the problem that the brake cannot automatically return is solved.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and more specifically, to a rolling return brake. Background Technology

[0002] In fixed caliper disc brakes, the brake pads typically do not have an active return function. During each braking process, the brake pads clamp the brake disc under the action of a hydraulically driven piston, generating braking force to slow down or stop the vehicle; when braking ends, the piston returns to its original position first, and the brake pads are then thrown away from the brake disc by the rotation of the brake disc, thus achieving the passive return of the brake pads.

[0003] In existing technologies, brake pad return mainly relies on the swinging action of the brake disc rotation after the piston returns, lacking an active and stable return driving force, resulting in incomplete brake pad return. When the brake pad cannot completely detach from the brake disc, continuous drag occurs between the brake disc and the brake pad, causing an increase in drag torque, which in turn leads to increased fuel consumption. At the same time, drag also causes abnormal wear of the brake pads and brake noise. Summary of the Invention

[0004] To solve the problem of brakes failing to automatically return to their original position, this invention provides a rolling return brake, comprising:

[0005] The housing assembly includes a housing body and a drive unit; the drive unit is connected to the housing body.

[0006] The brake pad assembly is connected to the drive unit; the drive unit is used to move the brake pad assembly from the initial position to the braking position.

[0007] The first return assembly includes a return unit and a limiting unit; the limiting unit is connected to the housing body, and the gap between at least part of the limiting unit and the brake pad assembly gradually decreases along the driving direction of the drive unit; one end of the return unit is connected to the brake pad assembly, and the other end abuts against the limiting unit.

[0008] The braking state of the rolling return brake includes: the drive unit drives the brake pad assembly to the braking position, which in turn drives the return unit to move along the limiting unit. The return unit is squeezed by the limiting unit and stores energy.

[0009] The return state of the rolling return brake includes: the return unit releases energy, causing the contact point between the return unit and the limit unit to roll along the limit unit towards the initial position, thereby causing the brake pad assembly to move to the initial position.

[0010] Optionally, the return unit includes an elastic part, a connecting part, and a rolling part; the two ends of the elastic part are respectively connected to the brake pad assembly and the connecting part; the rolling part is rotatably connected to the end of the connecting part away from the elastic part; the rolling part abuts against the limiting unit.

[0011] The braking state includes: the limiting unit squeezing the rolling part, causing the elastic part to store energy;

[0012] The return state includes: the elastic part releases energy, causing the rolling part to roll along the limiting unit towards the initial position.

[0013] Optionally, the limiting unit includes a first limiting module and a second limiting module; both the first limiting module and the second limiting module are connected to the housing body and are respectively disposed on both sides of the brake pad assembly along the first direction; the first limiting module and the second limiting module abut against different return units; the gap between at least a portion of the first limiting module and the brake pad assembly gradually decreases along the driving direction, and the gap between at least a portion of the second limiting module and the brake pad assembly gradually decreases along the driving direction; the minimum gap between the first limiting module and the brake pad assembly along the first direction is greater than the minimum gap between the second limiting module and the brake pad assembly along the first direction.

[0014] Optionally, the maximum gap between the first limiting module and the brake pad assembly along the first direction is greater than the maximum gap between the second limiting module and the brake pad assembly along the first direction.

[0015] Optionally, the first limiting module includes a first outer inclined groove, a first inner inclined groove, and a first limiting part; the first outer inclined groove, the first inner inclined groove, and the first limiting part are all connected to the shell body; the first outer inclined groove and the first inner inclined groove are arranged at intervals along the second direction; the gap between the first limiting part and the brake pad assembly along the first direction is the first gap, the gap between the first outer inclined groove and the brake pad assembly along the first direction is the second gap, and the gap between the first inner inclined groove and the brake pad assembly along the first direction is the third gap, and the first gap is smaller than the second gap and the third gap;

[0016] The second limiting module includes a second outer inclined groove, a second inner inclined groove, and a second limiting part; the second outer inclined groove, the second inner inclined groove, and the second limiting part are all connected to the shell body; the second outer inclined groove and the second inner inclined groove are arranged at intervals along the second direction; the gap between the second limiting part and the brake pad assembly along the first direction is the fourth gap, the gap between the second outer inclined groove and the brake pad assembly along the first direction is the fifth gap, and the gap between the second inner inclined groove and the brake pad assembly along the first direction is the sixth gap, and the fourth gap is smaller than the fifth gap and the sixth gap;

[0017] There are four return units; the four return units are connected to the four corners of the brake pad assembly respectively, and abut against the first outer inclined groove, the first inner inclined groove, the second outer inclined groove and the second inner inclined groove respectively; the second gap, the third gap, the fifth gap and the sixth gap all gradually decrease along the driving direction;

[0018] The first gap is larger than the fourth gap; the maximum value of the second gap is larger than the maximum value of the fifth gap, and the maximum value of the third gap is larger than the maximum value of the sixth gap.

[0019] Optionally, the rolling return brake also includes:

[0020] The second return assembly includes a first return section and a second return section; the first return section and the second return section are arranged at intervals along a first direction and are both connected to the brake pad assembly.

[0021] The braking state also includes: the first return section and the second return section are compressed by the brake pad assembly and store elastic energy;

[0022] The return state also includes: the first return section and the second return section releasing elastic energy, driving the brake pad assembly to move to the initial position.

[0023] Optionally, the first inner inclined groove is located between the first outer inclined groove and the first return portion, and the connection between the brake pad assembly and the drive unit is located between the first outer inclined groove and the first inner inclined groove along the second direction; the maximum value of the second gap is greater than the maximum value of the third gap.

[0024] The second inner inclined groove is located between the second outer inclined groove and the second return section. The connection between the brake pad assembly and the drive unit is located between the second outer inclined groove and the second inner inclined groove along the second direction. The maximum value of the fifth gap is greater than the maximum value of the sixth gap.

[0025] Optionally, the elastic coefficient of the first repositioning part is smaller than that of the second repositioning part.

[0026] Optionally, the return force of the first return section is less than the return force of the return unit that abuts against the first inner inclined groove.

[0027] Optionally, the housing assembly further includes a guide unit; both ends of the guide unit are connected to the housing body and pass through the brake pad assembly; the extension direction of the guide unit is parallel to the driving direction; the first return part and the second return part are both sleeved on the guide unit;

[0028] The braking state also includes: the brake pad assembly moving along the guide unit to the braking position;

[0029] The return state also includes: the brake pad assembly moving to the initial position along the guide unit.

[0030] Optionally, the brake pad assembly includes a base unit and a brake pad unit; the base unit is driven and connected to the drive unit and to the return unit; the base unit is sleeved on the guide unit and connected to the second return assembly; the brake pad unit is connected to the base unit.

[0031] Optionally, the base unit includes a base body, a guide hole, a first mounting part, and a second mounting part;

[0032] The base body is connected to the drive unit; the guide hole is opened on the base body and fitted onto the guide unit; the first mounting part is connected to the base body and to the brake pad unit; the second mounting part is connected to the base body and to the second return assembly.

[0033] Optionally, the first return assembly further includes a guide unit; the guide unit is connected to the housing body and to the end of the limiting unit near the braking position; the gap between the guide unit and the brake pad assembly gradually increases along the driving direction.

[0034] To solve the problem of the brake failing to return to its automatic position, this invention has the following advantages:

[0035] By setting a return unit and a limit unit, with the contact surface between the limit unit and the return unit being an inclined plane, the return unit stores energy when the driving force is applied; when the driving force is removed, the return unit automatically releases the stored energy, and the axial component of its reaction force points towards the initial position, which can actively and smoothly push the brake pad assembly back. Because the return unit and the limit unit are in contact and the contact point rolls along the surface of the limit unit towards the initial position when the energy is released, compared with sliding friction, the resistance and wear are greatly reduced, making the energy release process extremely smooth and efficient. This allows the brake pad assembly to quickly and smoothly return to the initial position accurately. At the same time, the rolling method significantly reduces the wear and heat generation of the contact surface, extending the service life under frequent operation. Attached Figure Description

[0036] Figure 1 A front view schematic diagram of a rolling return brake according to one embodiment is shown;

[0037] Figure 2 A schematic diagram of the structure of a rolling return brake according to one embodiment is shown;

[0038] Figure 3 A schematic diagram of the return unit of a rolling return brake according to one embodiment is shown;

[0039] Figure 4 A schematic diagram of the first limiting module of a rolling return brake according to one embodiment is shown;

[0040] Figure 5 It shows Figure 4 A magnified view of a portion of the image;

[0041] Figure 6 A schematic diagram of the second limiting module of a rolling return brake according to one embodiment is shown;

[0042] Figure 7 It shows Figure 6 A magnified view of a portion of the image;

[0043] Figure 8 A schematic diagram of a brake pad assembly for a rolling return brake according to one embodiment is shown.

[0044] Reference numerals: 10 Housing assembly; 11 Housing body; 12 Drive unit; 13 Guide unit; 131 First guide shaft; 132 Second guide shaft; 20 Brake pad assembly; 21 Base unit; 211 Base body; 212 Guide hole; 213 Second mounting part; 22 Brake pad unit; 30 First return assembly; 31 Return unit; 311 Elastic part; 312 Connecting part; 313 Rolling part; 32 Limiting unit; 321 First limiting module; 3211 First outer inclined groove; 3212 First inner inclined groove; 3213 First limiting part; 322 Second limiting module; 3221 Second outer inclined groove; 3222 Second inner inclined groove; 3223 Second limiting part; 33 Guide unit; 40 Second return assembly; 41 First return part; 42 Second return part. Detailed Implementation

[0045] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0046] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0047] Fixed caliper disc brakes are a common braking device in vehicle braking systems. The caliper body is rigidly fixed to the axle or steering knuckle. Pistons are installed in cylinder bores on both sides of the caliper body. During braking, hydraulic pressure pushes both pistons to extend simultaneously, clamping the brake pads against the brake disc to generate braking torque. After the brake is released, the brake pads need to separate from the brake disc surface and return to their original position to avoid drag. Currently, there are several main methods for the return of fixed caliper brakes: First, using the elastic deformation of the piston seal ring (usually a rectangular seal ring) to achieve return. During braking, the seal ring undergoes elastic deformation, and after the brake is released, the seal ring recovers its deformation, driving the piston back to its original position. Second, a return spring is installed between the brake pads and the caliper body or bracket, and the spring force pushes the brake pads back to their original position. Third, after braking, the brake disc rotates, throwing the brake pads apart to achieve return.

[0048] However, the aforementioned existing return mechanisms all have significant shortcomings in practical applications. In the method relying on the elastic deformation of the sealing ring for return, the deformation of the sealing ring is extremely limited, resulting in a small return force and insufficient piston return. In the method using a return spring, the frictional resistance between the spring and the guide pin and spring seat also consumes some spring energy, slowing down the return speed and easily generating frictional noise and wear. The method relying on the rotation of the brake disc to throw off the brake pads is a passive return mechanism, with a slow and uncontrollable return speed. Overall, existing fixed-caliper brake return mechanisms generally suffer from insufficient return force and slow return speed after brake release. The energy loss during the return process is significant, causing the brake pads to not separate from the brake disc in a timely and sufficient manner, generating a large drag torque, which in turn increases vehicle energy consumption and accelerates the wear of the brake pads and brake disc.

[0049] Example 1:

[0050] In this embodiment, as Figure 1 and Figure 2 As shown, a rolling return brake is provided, comprising:

[0051] The housing assembly 10 includes a housing body 11 and a drive unit 12; the drive unit 12 is connected to the housing body 11; the housing body 11 is fixed to the outside and provides an installation reference for the entire brake.

[0052] Brake pad assembly 20 is driven and connected to drive unit 12; drive unit 12 is used to drive brake pad assembly 20 from initial position to braking position; specifically, drive unit 12 adopts hydraulic drive, which has fast response speed and is safe and reliable.

[0053] The first return assembly 30 includes a return unit 31 and a limiting unit 32. The limiting unit 32 is connected to the housing body 11. The gap between the limiting unit 32 and the brake pad assembly 20 gradually decreases along the driving direction of the driving unit 12, forming a wedge-shaped track constraint structure. One end of the return unit 31 is connected to the brake pad assembly 20, and the other end abuts against the limiting unit 32.

[0054] The braking state of the rolling return brake includes: the drive unit 12 drives the brake pad assembly 20 to move to the braking position, causing the return unit 31 to move along the limiting unit 32. The return unit 31 is squeezed by the limiting unit 32 and stores energy. During this movement, the return unit 31 connected to the brake pad assembly 20 is forced to slide along the limiting unit 32. As the gap between the limiting unit 32 and the brake pad assembly 20 gradually decreases along the driving direction, the return unit 31 will be squeezed by the limiting unit 32 more and more as the braking stroke deepens, thereby converting the hydraulic energy of the braking input into elastic potential energy and storing it inside the return unit 31.

[0055] The return state of the rolling return brake includes: the return unit 31 releases energy, causing the contact point between the return unit 31 and the limiting unit 32 to roll along the limiting unit 32 towards the initial position, thereby moving the brake pad assembly 20 to the initial position. When the driving force is removed, the return unit 31 automatically releases the stored energy. Since the contact surface is an inclined slope, the axial component of its reaction force points towards the initial position, actively and smoothly pushing the brake pad assembly 20 back. Because the return unit 31 and the limiting unit 32 are in contact, and the contact point does not slide friction during energy release, but rolls along the surface of the limiting unit 32 towards the initial position, this method greatly reduces resistance and wear compared to sliding friction, making the energy release process extremely smooth and efficient, thus quickly and smoothly driving the brake pad assembly 20 to accurately return to the initial position. At the same time, the rolling method significantly reduces wear and heat generation on the contact surface, extending the service life under frequent operation.

[0056] Furthermore, such as Figure 3 As shown, the return unit 31 includes an elastic part 311, a connecting part 312, and a rolling part 313. The two ends of the elastic part 311 are connected to the brake pad assembly 20 and the connecting part 312, respectively. The elastic part 311 serves as an energy storage core, storing energy in the braking state and releasing energy in the return state. The rolling part 313 is rotatably connected to the end of the connecting part 312 away from the elastic part 311. The connecting part 312 serves as a rigid force transmission component, which can accurately transmit the deformation force of the elastic part 311 to the rolling part 313. The rolling part 313 abuts against the limiting unit 32. The elastic part 311, the connecting part 312, and the rolling part 313 can be replaced individually, greatly reducing maintenance costs and complexity.

[0057] The braking state includes: the limiting unit 32 squeezes the rolling part 313, and the squeezing force efficiently compresses the elastic part 311 through the connecting part 312, causing the elastic part 311 to store energy. Since the rolling part 313 can rotate freely, the squeezing itself does not produce sliding wear. The elastic part 311 is deformed only by the radial displacement of the rolling part 313. The energy conversion efficiency is extremely high and the component wear is minimal.

[0058] The return state includes: the elastic part 311 releases energy and pushes the rolling part 313 to roll along the limiting unit 32 towards the initial position through the connecting part 312; the rolling contact replaces the sliding contact, which greatly reduces the return resistance. Almost all the energy released by the elastic part 311 is converted into the return driving force without having to overcome friction loss, thereby ensuring that the brake pad assembly 20 can quickly, smoothly and accurately return to the initial position. At the same time, the rotation of the rolling part 313 also avoids scratch damage between it and the limiting unit 32, which significantly extends the service life of the limiting unit 32 and the return unit 31.

[0059] Furthermore, a gap is left between the limiting unit 32 and the brake pad assembly 20. Because the frequency of forward braking is much higher than reverse braking, the brake disc rotates at high speed in a single direction along with the wheel. This causes the brake pad assembly 20 to be subjected to frictional traction during braking, resulting in it moving forward much more often than backward. This long-term, unidirectional, minute movement causes the edge of the brake pad assembly 20 to repeatedly impact or scrape the housing body 11, generating abnormal noise and accelerating localized wear. Therefore, a movement gap is intentionally left between the limiting unit 32 and the brake pad assembly 20 to isolate this non-braking contact.

[0060] Furthermore, such as Figure 4 and Figure 6 As shown, the limiting unit 32 includes a first limiting module 321 and a second limiting module 322; both the first limiting module 321 and the second limiting module 322 are connected to the housing body 11 and are respectively disposed on both sides of the brake pad assembly 20 along a first direction, which is perpendicular to the driving direction and parallel to the vehicle movement direction; the first limiting module 321 and the second limiting module 322 are respectively abutted against different return units 31; the gap between at least a portion of the first limiting module 321 and the brake pad assembly 20 gradually decreases along the driving direction, and the gap between at least a portion of the second limiting module 322 and the brake pad assembly 20 gradually decreases along the driving direction; the minimum gap between the first limiting module 321 and the brake pad assembly 20 along the first direction is greater than the minimum gap between the second limiting module 322 and the brake pad assembly 20 along the first direction. The gap of the first limiting module 321 (located on the forward direction side) is designed to be larger than that of the second limiting module 322 (located on the reverse direction side). Due to the high frequency of contact friction in the forward direction, the cumulative offset of the brake pad assembly 20 is larger, requiring a wider gap to accommodate its long-term movement and avoid premature contact with the housing. In contrast, the reverse direction is used very infrequently and has a small offset, so a smaller gap can be used to balance the guiding accuracy and lateral constraint during return.

[0061] Furthermore, the maximum gap between the first limiting module 321 and the brake pad assembly 20 along the first direction is greater than the maximum gap between the second limiting module 322 and the brake pad assembly 20 along the first direction. Because the frequency of forward braking is much higher than that of reverse braking, the brake pad assembly 20 is affected by frictional traction during braking, and the load in the forward direction is much greater than that in the reverse direction. This requires the return unit 31, which abuts against the first limiting module 321 (located on the forward direction side), to output a greater elastic force to effectively counteract the additional off-center load in this direction and prevent the brake pad assembly 20 from shifting and jamming due to long-term unidirectional force. However, in actual production, the number of return units 31 is large and the parts are small. If elastic parts 311 with different stiffness are purchased for different positions and assembled one by one, it will greatly increase the difficulty of material management and assembly. Therefore, for engineering economic considerations, all return units 31 use elastic parts 311 and rolling parts 313 of the same specification. In this embodiment, the inclination of the first limiting module 321 and the second limiting module 322 are set to be different. During braking, the return units 31 that abut against them move the same length along the driving direction, but because the two Due to different inclination angles, the amount of displacement of the return unit 31 in the radial direction (i.e., the first direction) varies. Specifically, the maximum gap between the first limiting module 321 and the brake pad assembly 20 in the first direction is greater than the maximum gap between the second limiting module 322 and the brake pad assembly 20 in the same direction. This means that under the same axial stroke, the rolling part 313 experiences greater radial compression when entering the area of ​​the first limiting module 321, thereby driving the elastic part 311 to produce greater elastic deformation, storing more energy, and ultimately releasing greater elastic force during return. Conversely, the second limiting module 322 has a smaller maximum gap and a gentler inclination, resulting in a smaller compression and rebound force of the corresponding return unit 31. Thus, without replacing any parts, the asymmetrical matching of elastic forces on both sides is achieved with a uniformly sized return unit 31 through differentiated design of the limiting modules, while significantly simplifying the procurement and assembly process and greatly improving the production efficiency and maintenance convenience of the brake.

[0062] Furthermore, such as Figure 5 As shown, the first limiting module 321 includes a first outer inclined groove 3211, a first inner inclined groove 3212, and a first limiting part 3213; the first outer inclined groove 3211, the first inner inclined groove 3212, and the first limiting part 3213 are all connected to the shell body 11; the first outer inclined groove 3211 and the first inner inclined groove 3212 are arranged at intervals along the second direction; the second direction, the first direction, and the driving direction are perpendicular to each other; the gap between the first limiting part 3213 and the brake pad assembly 20 along the first direction is the first gap; the gap between the first outer inclined groove 3211 and the brake pad assembly 20 along the first direction is the second gap; the gap between the first inner inclined groove 3212 and the brake pad assembly 20 along the first direction is the third gap; the first gap is smaller than the second gap and the third gap.

[0063] like Figure 7 As shown, the second limiting module 322 includes a second outer inclined groove 3221, a second inner inclined groove 3222, and a second limiting part 3223; the second outer inclined groove 3221, the second inner inclined groove 3222, and the second limiting part 3223 are all connected to the shell body 11; the second outer inclined groove 3221 and the second inner inclined groove 3222 are arranged at intervals along the second direction; the gap between the second limiting part 3223 and the brake pad assembly 20 along the first direction is the fourth gap, the gap between the second outer inclined groove 3221 and the brake pad assembly 20 along the first direction is the fifth gap, and the gap between the second inner inclined groove 3222 and the brake pad assembly 20 along the first direction is the sixth gap, and the fourth gap is smaller than the fifth gap and the sixth gap.

[0064] The first limiting module 321 and the second limiting module 322 have the same structure. Each limiting module includes an outer inclined groove, an inner inclined groove, and a limiting part. The gap between the outer and inner inclined grooves gradually decreases along the driving direction, providing a wedge-shaped track for the rolling part 313. During braking, it gradually compresses and stores energy, and provides a gradual release of driving force during return. The gap of the limiting part does not change gradually. The limiting part is located on both sides of the inclined groove and axially limits the rolling part 313, restricting the roller from rolling in the inclined groove. The gap between the limiting part and the brake pad assembly 20 (first gap, fourth gap) is designed to be smaller than the gap of the inclined groove on the same side (second gap, third gap, fifth gap, sixth gap), ensuring that there is always a gap between the limiting unit 32 and the brake pad assembly 20.

[0065] There are four return units 31; the four return units 31 are connected to the four corners of the brake pad assembly 20 respectively, and abut against the first outer inclined groove 3211, the first inner inclined groove 3212, the second outer inclined groove 3221 and the second inner inclined groove 3222 respectively, forming a four-point support and driving pattern in space. This arrangement ensures that the driving force and return force of the brake pad assembly 20 are evenly transmitted through the four corner points during braking or return, effectively avoiding the phenomenon of brake pad tilting, uneven wear or jamming caused by unilateral force or manufacturing error, and greatly improving the uniformity of the brake contact surface and the braking stability; the second gap, the third gap, the fifth gap and the sixth gap all gradually decrease along the driving direction.

[0066] The first gap is larger than the fourth gap. Due to the high-frequency contact friction in the forward direction, the cumulative offset of the brake pad assembly 20 is greater, requiring a wider gap to accommodate its long-term movement and prevent premature contact with the housing. In the reverse direction, due to minimal use and small offset, a smaller gap can be used to balance guiding accuracy and lateral constraint during return. The maximum value of the second gap is greater than the maximum value of the fifth gap, and the maximum value of the third gap is greater than the maximum value of the sixth gap. This means that under the same driving direction stroke, the return unit 31, which abuts against the first limit module 321 side, will obtain a larger radial compression space due to the larger inclined slot opening, thus generating greater elastic deformation and return force. Conversely, the return unit 31, which abuts against the second limit module 322 side, has a smaller gap, resulting in correspondingly smaller compression and rebound force. Since all return units 31 are of uniform specifications, there is no need to differentiate between procurement and assembly. The large return force in the forward direction can counteract high-frequency, high-load conditions, while the small return force in the reverse direction can counteract low-frequency, small-load conditions, simply by using the geometric differences between the two limit modules.

[0067] Furthermore, such as Figure 1 and Figure 2 As shown, the rolling return brake also includes:

[0068] The second return assembly 40 includes a first return section 41 and a second return section 42. The first return section 41 and the second return section 42 are arranged at intervals along a first direction and are both connected to the brake pad assembly 20. In the braking state, the first return section 41 and the second return section 42 are compressed by the brake pad assembly 20 and store elastic energy. In the return state, the first return section 41 and the second return section 42 release elastic energy, driving the brake pad assembly 20 to move to the initial position. During braking, the first return section 41 and the second return section 42 are directly compressed by the brake pad assembly 20 and store elastic energy. During return, they release energy first to provide initial driving force, and cooperate with the first return assembly 30 to drive the brake pad assembly 20 to return, thereby improving the return speed. As an auxiliary return method independent of the limiting groove, the second return assembly 40 can still independently provide basic return force even if the first return assembly 30 experiences a decrease in return force due to wear or contamination, significantly improving the reliability of the brake under long-term high-frequency operating conditions. Specifically, the first return part 41 and the second return part 42 adopt return springs.

[0069] Furthermore, such as Figure 5 As shown, the first inner inclined groove 3212 is located between the first outer inclined groove 3211 and the first return part 41. The connection between the brake pad assembly 20 and the drive unit 12 is located between the first outer inclined groove 3211 and the first inner inclined groove 3212 along the second direction, ensuring that the driving force output by the drive unit 12 can be evenly transmitted to the brake pad assembly 20; the maximum value of the second gap is greater than the maximum value of the third gap.

[0070] like Figure 7As shown, the second inner inclined groove 3222 is located between the second outer inclined groove 3221 and the second return portion 42, and the connection between the brake pad assembly 20 and the drive unit 12 is located between the second outer inclined groove 3221 and the second inner inclined groove 3222 along the second direction; the maximum value of the fifth gap is greater than the maximum value of the sixth gap.

[0071] In actual use, because the second return assembly 40 is closer to the inner inclined groove side, the inner inclined groove and the second return assembly 40 are located on the same side of the drive connection, while the outer inclined groove is located on the other side. Therefore, to ensure that the brake pad assembly 20 does not generate a deflection torque in the second direction and is subjected to uniform force, the balance condition that the return force on the outer inclined groove side is equal to the sum of the return forces on the inner inclined groove side and the second return assembly 40 must be met. The existence of the second return assembly 40 is equivalent to providing additional assistance to the inner inclined groove side, so that the return force that the inner inclined groove side needs to bear independently can be less than that on the outer inclined groove side. Under the premise that all four return units 31 are of the same specification, it is impossible to pass through... The return force is adjusted by changing the parts themselves. Differentiation is achieved by changing the inclination angle of the outer and inner inclined grooves. The larger the inclination angle (i.e. the larger the maximum gap with the brake pad assembly 20), the greater the radial compression of the return unit 31 under the same axial stroke, the more elastic energy is stored, and the greater the return force. Conversely, the smaller the inclination angle, the greater the radial compression. Therefore, the maximum gap of the outer inclined groove is designed to be greater than the maximum gap of the inner inclined groove, so that the return unit 31 on the outer inclined groove side can output a larger return force, thereby ensuring the torque balance on both sides of the drive connection. The brake pad assembly 20 does not deflect around the second direction during the entire braking and return process, avoiding the risk of uneven wear and jamming.

[0072] Furthermore, the elastic coefficient of the first return section 41 is smaller than that of the second return section 42. Since the return force on the side of the first limiting module 321 (forward direction) is greater than that on the side of the second limiting module 322 (reverse direction), this asymmetrical return force will cause the brake pad assembly 20 to deflect during the return process. If no intervention is provided, it will cause the brake pad assembly 20 to tilt and reset, resulting in uneven contact with the brake disc or even uneven wear. To eliminate this deflection tendency, the first return section 41 on the side of the second return assembly 40 closer to the first limiting module 321 is set to have a smaller elastic coefficient, while the second return section 42 on the side of the second limiting module 322 has a larger elastic coefficient. The auxiliary return force provided by the first return section 41 is less than that provided by the second return section 42. The difference between the two forms a compensating torque that is opposite to the direction of the deflection torque mentioned above. This dynamically cancels the deflection tendency throughout the return process, ensuring that the brake pad assembly 20 is subjected to balanced force on both sides and always returns to the initial position parallel to the brake disc.

[0073] Furthermore, the return force of the first return section 41 is less than the return force of the return unit 31 that abuts against the first inner inclined groove 3212. That is, the return force of the first return section 41 is less than the return force of the elastic section 311. In the single-sided limiting module, by making the maximum gap of the outer inclined groove greater than that of the inner inclined groove, the return unit 31 that abuts at the outer inclined groove outputs a greater return force than that at the inner inclined groove, and the second return section 42 on the same side provides the difference compensation, thereby satisfying the balance relationship that the return force of the outer inclined groove is equal to the return force of the inner inclined groove plus the return force of the return section on the same side. Under this constraint, the return force of the first return section 41 is set to be less than the return force of the return unit 31 that abuts at the inner inclined groove on the same side. The return unit 31 at the inner inclined groove plays a dominant role, bearing the main return force component in the single-sided balance, while the second return section 42 only plays an auxiliary compensation role. Even if the performance of the second return section 42 degrades or fluctuates due to long-term use, since its share is small, the overall force balance on the single side is still mainly guaranteed by the return unit 31, and the brake pad assembly 20 will not produce significant deflection.

[0074] Furthermore, such as Figure 1 As shown, the housing assembly 10 also includes a guide unit 13; both ends of the guide unit 13 are connected to the housing body 11 and pass through the brake pad assembly 20; the extension direction of the guide unit 13 is parallel to the driving direction; the first return part 41 and the second return part 42 are both sleeved on the guide unit 13; the guide unit 13 is used to guide the movement of the brake pad assembly 20, ensuring that the movement trajectory of the brake pad assembly 20 is accurate. When braking, the brake pad assembly 20 moves precisely to the braking position along the guide unit 13, and returns to the initial position along the same path when returning, ensuring that the brake pad assembly 20 has no lateral movement or attitude deflection during the entire stroke, avoiding the risk of brake disc wear or return jamming caused by radial offset; the compression and release processes of the first return part 41 and the second return part 42 sleeved on the guide unit 13 are also constrained to the driving direction, preventing the return part from bending or tilting when subjected to force, ensuring the directionality of its energy storage and release, and ensuring the stability, repeatability and operational reliability of the brake. The braking state also includes: the brake pad assembly 20 moving along the guide unit 13 to the braking position; the return state also includes: the brake pad assembly 20 moving along the guide unit 13 to the initial position.

[0075] Furthermore, such as Figure 2 As shown, the guide unit 13 includes a first guide shaft 131 and a second guide shaft 132. The first return part 41 is sleeved on the first guide shaft 131, and the second return part 42 is sleeved on the second guide shaft 132. The dual-axis guide structure ensures that the brake pad assembly 20 returns to a more accurate position.

[0076] Furthermore, such as Figure 2As shown, the brake pad assembly 20 includes a base unit 21 and a brake pad unit 22. The base unit 21 is driven and connected to the drive unit 12 and the return unit 31 to transmit the driving force to the return unit 31. The base unit 21 is sleeved on the guide unit 13 to ensure the motion accuracy in the driving direction and is connected to the second return assembly 40 to provide auxiliary return. The brake pad unit 22 is connected to the base unit 21. The brake pad unit 22 and the base unit 21 are functionally separated, so that the base unit 21 can be independently optimized as a high-strength, high-wear-resistant force-bearing and guiding substrate, while the brake pad unit 22 focuses on serving as a replaceable friction-consuming layer. The two do not interfere with each other. The system allows for the selection of appropriate materials and processes. During braking, the base unit 21 precisely guides the brake pad unit 22 to the braking position along the guide unit 13. During return, the base unit 21 synchronously transmits the return force of the first return assembly 30 and the second return assembly 40 to the brake pad unit 22. When the brake pad unit 22 wears to its life limit, only the brake pad unit 22 needs to be replaced without disassembling the base unit 21 and its connected drive unit 12, return unit 31 and guide unit 13. This significantly reduces maintenance costs and downtime, and also allows for the selection of brake pad units 22 with different friction coefficients according to different working conditions without affecting the versatility of the base unit 21.

[0077] Furthermore, such as Figure 8 As shown, the base unit 21 includes a base body 211, a guide hole 212, a first mounting part, and a second mounting part 213. The base body 211 is drivenly connected to the drive unit 12. The guide hole 212 is opened on the base body 211 and sleeved on the guide unit 13. The guide hole 212 and the guide unit 13 cooperate for convenient and quick installation. The first mounting part is connected to the base body 211 and to the brake pad unit 22. The second mounting part 213 is connected to the base body 211 and to the second return assembly 40. The second mounting part 213 is a mounting hole, which facilitates the quick installation and removal of the second return assembly 40.

[0078] Furthermore, such as Figure 1 As shown, there are two brake pad assemblies 20, which are arranged opposite to each other. During operation, the brake disc is located between the two brake pad assemblies 20 to ensure braking effect.

[0079] Furthermore, such as Figure 5 and Figure 7 As shown, the first return assembly 30 also includes a guide unit 33; the guide unit 33 is connected to the housing body 11 and to the end of the limiting unit 32 near the braking position; the gap between the guide unit 33 and the brake pad assembly 20 gradually increases along the driving direction. That is, the guide unit 33 is an inclined surface opposite to the inclination direction of the limiting unit 32, so that when installing the brake pad unit 22, it is convenient for the brake pad unit 22 and the return assembly to slide smoothly into the space between the first limiting module 321 and the second limiting module 322.

[0080] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A rolling return brake, characterized in that, The rolling return brake includes: The housing assembly includes a housing body and a drive unit; the drive unit is connected to the housing body. A brake pad assembly is driven and connected to the drive unit; the drive unit is used to drive the brake pad assembly to move from an initial position to a braking position. The first return assembly includes a return unit and a limiting unit; the limiting unit is connected to the housing body, and the gap between at least part of the limiting unit and the brake pad assembly gradually decreases along the driving direction of the driving unit; one end of the return unit is connected to the brake pad assembly, and the other end abuts against the limiting unit. The braking state of the rolling return brake includes: the drive unit drives the brake pad assembly to move to the braking position, causing the return unit to move along the limiting unit, and the return unit stores energy under the compression of the limiting unit; The return state of the rolling return brake includes: the return unit releases the energy, causing the contact point between the return unit and the limiting unit to roll along the limiting unit toward the initial position, thereby causing the brake pad assembly to move to the initial position.

2. The rolling return brake according to claim 1, characterized in that, The return unit includes an elastic part, a connecting part, and a rolling part; the two ends of the elastic part are respectively connected to the brake pad assembly and the connecting part; the rolling part is rotatably connected to the end of the connecting part away from the elastic part; the rolling part abuts against the limiting unit; The braking state includes: the limiting unit squeezing the rolling part, causing the elastic part to store energy; The return state includes: the elastic part releasing the energy, causing the rolling part to roll along the limiting unit towards the initial position.

3. A rolling return brake according to claim 1, characterized in that, The limiting unit includes a first limiting module and a second limiting module; both the first limiting module and the second limiting module are connected to the housing body and are respectively disposed on both sides of the brake pad assembly along a first direction; the first limiting module and the second limiting module abut against different return units; the gap between at least a portion of the first limiting module and the brake pad assembly gradually decreases along the driving direction, and the gap between at least a portion of the second limiting module and the brake pad assembly gradually decreases along the driving direction; the minimum gap between the first limiting module and the brake pad assembly along the first direction is greater than the minimum gap between the second limiting module and the brake pad assembly along the first direction.

4. A rolling return brake according to claim 3, characterized in that, The maximum gap between the first limiting module and the brake pad assembly along the first direction is greater than the maximum gap between the second limiting module and the brake pad assembly along the first direction.

5. A rolling return brake according to claim 3 or 4, characterized in that, The first limiting module includes a first outer inclined groove, a first inner inclined groove, and a first limiting part; the first outer inclined groove, the first inner inclined groove, and the first limiting part are all connected to the shell body; the first outer inclined groove and the first inner inclined groove are arranged at intervals along the second direction; the gap between the first limiting part and the brake pad assembly along the first direction is the first gap, the gap between the first outer inclined groove and the brake pad assembly along the first direction is the second gap, and the gap between the first inner inclined groove and the brake pad assembly along the first direction is the third gap, and the first gap is smaller than the second gap and the third gap; The second limiting module includes a second outer inclined groove, a second inner inclined groove, and a second limiting part; the second outer inclined groove, the second inner inclined groove, and the second limiting part are all connected to the shell body; the second outer inclined groove and the second inner inclined groove are arranged at intervals along the second direction; the gap between the second limiting part and the brake pad assembly along the first direction is the fourth gap, the gap between the second outer inclined groove and the brake pad assembly along the first direction is the fifth gap, and the gap between the second inner inclined groove and the brake pad assembly along the first direction is the sixth gap, wherein the fourth gap is smaller than the fifth gap and the sixth gap; The return unit is provided in four parts; the four return units are respectively connected to the four corners of the brake pad assembly and respectively abut against the first outer inclined groove, the first inner inclined groove, the second outer inclined groove and the second inner inclined groove; the second gap, the third gap, the fifth gap and the sixth gap all gradually decrease along the driving direction; The first gap is larger than the fourth gap; the maximum value of the second gap is larger than the maximum value of the fifth gap, and the maximum value of the third gap is larger than the maximum value of the sixth gap.

6. A rolling return brake according to claim 5, characterized in that, The rolling return brake also includes: The second return assembly includes a first return section and a second return section; the first return section and the second return section are arranged at intervals along the first direction and are both connected to the brake pad assembly. The braking state also includes: the first return portion and the second return portion are compressed by the brake pad assembly to store elastic energy; The return state further includes: the first return part and the second return part releasing the elastic energy, driving the brake pad assembly to move to the initial position.

7. A rolling return brake according to claim 6, characterized in that, The first inner inclined groove is located between the first outer inclined groove and the first return portion; the connection between the brake pad assembly and the drive unit is located between the first outer inclined groove and the first inner inclined groove along the second direction; the maximum value of the second gap is greater than the maximum value of the third gap; The second inner inclined groove is located between the second outer inclined groove and the second return portion; the connection between the brake pad assembly and the drive unit is located between the second outer inclined groove and the second inner inclined groove along the second direction; the maximum value of the fifth gap is greater than the maximum value of the sixth gap.

8. A rolling return brake according to claim 6, characterized in that, The elastic coefficient of the first return section is smaller than that of the second return section.

9. A rolling return brake according to claim 7, characterized in that, The return force of the first return section is less than the return force of the return unit that abuts against the first inner inclined groove.

10. A rolling return brake according to claim 6, characterized in that, The housing assembly further includes a guide unit; both ends of the guide unit are connected to the housing body and pass through the brake pad assembly; the extension direction of the guide unit is parallel to the driving direction; the first return portion and the second return portion are both sleeved on the guide unit; The braking state further includes: the brake pad assembly moving along the guide unit to the braking position; The return state also includes: the brake pad assembly moving along the guide unit to the initial position.

11. A rolling return brake according to claim 10, characterized in that, The brake pad assembly includes a base unit and a brake pad unit; the base unit is driven to the drive unit and connected to the return unit; the base unit is sleeved on the guide unit and connected to the second return assembly; the brake pad unit is connected to the base unit.

12. A rolling return brake according to claim 11, characterized in that, The base unit includes a base body, a guide hole, a first mounting part, and a second mounting part; the base body is drivenly connected to the drive unit; the guide hole is opened on the base body and sleeved on the guide unit; the first mounting part is connected to the base body and to the brake pad unit; the second mounting part is connected to the base body and to the second return assembly.

13. A rolling return brake according to claim 1, characterized in that, The first return assembly further includes a guide unit; the guide unit is connected to the housing body and to the end of the limiting unit near the braking position; the gap between the guide unit and the brake pad assembly gradually increases along the driving direction.

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