Braking device with traveling braking and parking braking functions

Abstract

The braking device comprises a hollow motor, a service braking structure and a parking braking structure, the hollow motor comprises a motor body, an upper shell and a lower shell, the motor body comprises a shell, a stator and a rotor, and the rotor is of a hollow cylindrical structure; the service braking structure is arranged in the rotor and is driven by rotation of the rotor to move in the axial direction of the rotor, and the service braking structure is connected with the calipers; the parking braking structure comprises a movable iron core and an electromagnet which are coaxially arranged, the outer wall of the rotor is partially sleeved with the movable iron core, only the movable iron core is allowed to move in the axial direction of the rotor, and the electromagnet is fixed to the inner side of the lower shell; when the electromagnet is electrified, the movable iron core is separated from the electromagnet, and when the hollow motor is started, the rotor rotates to drive the service braking structure to axially move, and the calipers are driven to realize service braking and releasing; when the electromagnet loses power, the movable iron core and the electromagnet are attracted, the movable iron core and the rotor are prevented from rotating, and parking braking is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking, and particularly to a braking device that combines service braking and parking braking. Background Art

[0002] Most of the existing electronically actuated mechanical caliper assemblies are only limited to being implemented in service braking and cannot be compatible with the vehicle parking braking condition. For such an electronically actuated caliper assembly, usually a pair of independent electronic parking caliper assemblies are added to the rear braking system to realize the vehicle parking function. In this way, not only does it increase the weight of the entire braking system, improve the complexity of the braking system, but also increases the manufacturing cost and maintenance cost of the braking system.

[0003] Therefore, a braking device that combines service braking and parking braking is needed to achieve the service braking and parking braking of the vehicle through one electro-mechanical caliper assembly. Summary of the Invention

[0004] An embodiment of the present invention provides a braking device that combines service braking and parking braking, optimizes the braking structure, sets a hollow motor, and integrates a service braking structure and a parking braking structure in the hollow motor to simplify the structure while realizing service braking and parking braking.

[0005] A braking device that combines service braking and parking braking provided by an embodiment of the present invention includes a hollow motor and a service braking structure and a parking braking structure disposed in the hollow motor. The hollow motor includes a motor main body, an upper housing, and a lower housing that enclose the motor main body. The motor main body includes a housing, a stator, and a rotor. The stator is disposed close to the inner wall of the housing, and the rotor is disposed at the center of the housing. The rotor has a hollow cylindrical structure. The service braking structure is disposed in the rotor and is driven to move axially along the rotor by the rotation of the rotor. The service braking structure is connected to the caliper. The parking braking structure includes a moving iron core and an electromagnet coaxially disposed. The moving iron core is partially sleeved on the outer wall of the rotor and only allows the moving iron core to move axially along the rotor. The electromagnet is fixed to the inner side of the lower housing. When the electromagnet is energized, the moving iron core is separated from the electromagnet, allowing the moving iron core to rotate with the rotor. When the hollow motor is started, the rotor rotates and then drives the service braking structure to move axially to drive the caliper to realize service braking and release. When the electromagnet is de-energized, the moving iron core is attracted to the electromagnet, preventing the moving iron core and the rotor from rotating, and realizing parking braking.

[0006] Preferably, the service brake structure includes a lead screw nut, a lead screw, and a piston. The lead screw nut is fixed to the inner wall of the rotor. The lead screw is disposed in the lead screw nut and connected to the piston. The piston is disposed at the center of the lower housing and is movably connected to the lower housing, such that the piston can axially move in the lower housing.

[0007] Preferably, a sleeve is fixedly provided at the center of the lower housing. A piston bushing is provided on the inner wall of the sleeve. The piston is disposed in the piston bushing and is slidably connected to the piston bushing.

[0008] Preferably, a rotation prevention sleeve for preventing the piston from rotating relative to the lower housing is provided on the inner wall of the end of the sleeve away from the rotor. A first rotation prevention surface is provided on the inner wall of the rotation prevention sleeve. A second rotation prevention surface matching the first rotation prevention surface is provided on the outer wall of the piston. When the piston passes through the rotation prevention sleeve, the first rotation prevention surface and the second rotation prevention surface are correspondingly arranged. The first rotation prevention surface and the second rotation prevention surface allow the piston to axially move relative to the lower housing and prevent the piston from rotating relative to the lower housing.

[0009] Preferably, both the electromagnet and the moving iron core are annularly sleeved or partially sleeved on the outer wall of the sleeve. The electromagnet is fixed to the lower housing by a first bolt.

[0010] Preferably, a third rotation prevention surface is provided on the inner wall of the moving iron core. A fourth rotation prevention surface matching the third rotation prevention surface is provided on the portion of the outer wall of the rotor connected to the moving iron core. When the moving iron core is sleeved on the rotor, the third rotation prevention surface and the fourth rotation prevention surface are correspondingly arranged. The third rotation prevention surface and the fourth rotation prevention surface allow the moving iron core to axially move relative to the rotor and prevent the moving iron core from rotating relative to the rotor.

[0011] Preferably, one end of the rotor close to the upper housing is disposed in the outer housing through a support bearing. The support bearing is installed in the outer housing through a lock nut. A magnet seat is provided at the end of the rotor connecting the support bearing, and a magnet is provided on the magnet seat. An electromagnetic angle sensor is fixed on one side of the upper housing close to the outer housing.

[0012] Preferably, service brake control terminals are provided on the outer housing. The service brake control terminals are electrically connected to the stator and the electromagnetic angle sensor. Parking brake control terminals are provided on the outer housing. The parking brake control terminals are electrically connected to the electromagnet.

[0013] Preferably, the upper housing is fixed to the outer housing by a second bolt, and an upper housing sealing ring is provided at the connection between the upper housing and the outer housing; the outer housing and the lower housing are connected to the housing of the caliper by a third bolt, and a lower housing sealing ring is provided at the connection between the lower housing and the outer housing.

[0014] Preferably, the piston is connected to the caliper, the pressure arm of the caliper is connected to one end of the actuating push rod, and the other end of the actuating push rod is arranged in the piston; the movement of the piston drives the actuating push rod to press or release the pressure arm to achieve vehicle braking and release.

[0015] Compared with the prior art, the technical solution of the embodiment of the present invention has beneficial effects.

[0016] For example, the braking device with both vehicle braking and parking braking provided by the present invention includes a hollow motor and a vehicle braking structure and a parking braking structure arranged in the hollow motor. The hollow motor includes a motor main body, an upper housing and a lower housing that enclose the motor main body. The motor main body includes an outer housing, a stator and a rotor. The stator is arranged close to the inner wall of the outer housing, the rotor is arranged at the center of the outer housing, and the rotor is in a hollow cylindrical structure; the vehicle braking structure is arranged in the rotor and is driven to move axially along the rotor by the rotation of the rotor, and the vehicle braking structure is connected to the caliper; the parking braking structure includes a moving iron core and an electromagnet arranged coaxially. The moving iron core is partially sleeved on the outer wall of the rotor and only allows the moving iron core to move axially along the rotor. The electromagnet is fixed inside the lower housing; when the electromagnet is energized, the moving iron core is separated from the electromagnet, allowing the moving iron core to rotate with the rotor. When the hollow motor starts, the rotor rotates and then drives the vehicle braking structure to move axially to drive the caliper to achieve vehicle braking and release; when the electromagnet is de-energized, the moving iron core is attracted to the electromagnet to prevent the moving iron core and the rotor from rotating, realizing parking braking; by setting a hollow motor and integrating a vehicle braking structure and a parking braking structure in the hollow motor, while realizing vehicle braking and parking braking, the structure is simplified and the product size is reduced, which is beneficial to the application of the braking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the braking device with both vehicle braking and parking braking according to an embodiment of the present invention; Figure 2 It is an exploded view of the braking device with both vehicle braking and parking braking according to an embodiment of the present invention; Figure 3 It is a schematic structural diagram of the moving iron core and the electromagnet according to an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the vehicle braking structure according to an embodiment of the present invention; Figure 5 It is a schematic structural diagram of the anti-rotation sleeve according to an embodiment of the present invention; Figure 6Cross-sectional view of the brake device connection caliper with both service brake and parking brake according to an embodiment of the present invention; Figure 7 Schematic structural diagram of the brake device connection caliper with both service brake and parking brake according to an embodiment of the present invention.

[0018] Description of the reference numerals: 1 - Service brake structure; 11 - Lead screw nut; 12 - Lead screw; 13 - Piston; 131 - Second anti-rotation surface; 2 - Parking brake structure; 22 - Moving iron core; 221 - Third anti-rotation surface; 23 - Electromagnet; 231 - First bolt; 3 - Motor main body; 31 - Outer shell; 311 - Service control terminal; 312 - Parking control terminal; 32 - Stator; 33 - Rotor; 34 - Support bearing; 341 - Locking nut; 35 - Magnet seat; 36 - Magnet; 4 - Upper housing; 41 - Electromagnetic angle sensor; 42 - Second bolt; 43 - Upper housing sealing ring; 5 - Lower housing; 51 - Sleeve; 52 - Piston bushing; 53 - Anti-rotation sleeve; 531 - First anti-rotation surface; 54 - Third bolt; 55 - Lower housing sealing ring; 6 - Caliper; 61 - Actuating push rod; 62 - Pressure arm. Detailed implementation manners

[0019] To make the objectives, features, and beneficial effects of the present invention more obvious and understandable, the detailed implementation manners of the present invention will be described in detail below with reference to the accompanying drawings. It can be understood that the following described detailed implementation manners are only used to explain the present invention and are not intended to limit the present invention. And, in the drawings, the same or similar reference numerals may be used to refer to the same or similar elements in different embodiments, and the descriptions of the same or similar elements in different embodiments and the descriptions of the prior art elements, features, effects, etc. may also be omitted. It should be noted that the axial direction, radial direction, and circumferential direction described in the embodiments of the present invention respectively represent the axial direction, radial direction, and circumferential direction of the rotor 33.

[0020] Refer to Figures 1 - 7 , an embodiment of the present invention provides a brake device with both service brake and parking brake.

[0021] Specifically, the braking device with both service braking and parking braking provided by the embodiments of the present invention includes a hollow motor and a service braking structure 1 and a parking braking structure 2 arranged in the hollow motor. The hollow motor includes a motor main body 3, an upper housing 4 and a lower housing 5 that enclose the motor main body 3. The motor main body 3 includes an outer shell 31, a stator 32 and a rotor 33. The stator 32 is arranged close to the inner wall of the outer shell 31, and the rotor 33 is arranged at the center of the outer shell 31. The rotor 33 is in a hollow cylindrical structure; the service braking structure 1 is arranged in the rotor 33 and is driven to move axially along the rotor 33 by the rotation of the rotor 33, and the service braking structure 1 is connected to the caliper 6; the parking braking structure 2 includes a moving iron core 22 and an electromagnet 23 arranged coaxially. The moving iron core 22 is partially sleeved on the outer wall of the rotor 33 and only allows the moving iron core 22 to move axially along the rotor 33. The electromagnet 23 is fixed to the inner side of the lower housing 5; when the electromagnet 23 is energized, the moving iron core 22 is separated from the electromagnet 23, allowing the moving iron core 22 to rotate with the rotor 33. When the hollow motor starts, the rotor 33 rotates to drive the service braking structure 1 to move axially to drive the caliper 6 to achieve service braking and release; when the electromagnet 23 is de-energized, the moving iron core 22 is attracted to the electromagnet 23, preventing the moving iron core 22 and the rotor 33 from rotating, and achieving parking braking.

[0022] Specifically, the parking braking structure 2 is an existing power-off type brake. When the electromagnet 23 is energized, the moving iron core 22 is separated from the electromagnet 23; when the electromagnet 23 is de-energized, the moving iron core 22 is attracted to the electromagnet 23.

[0023] In some embodiments, the service braking structure 1 includes a lead screw nut 11, a lead screw 12 and a piston 13. The lead screw nut 11 is fixed to the inner wall of the rotor 33, the lead screw 12 is arranged in the lead screw nut 11, and the lead screw 12 is connected to the piston 13; the piston 13 is arranged at the center of the lower housing 5 and is movably connected to the lower housing 5, so that the piston 13 can move axially in the lower housing 5.

[0024] Specifically, in some embodiments, the lead screw nut 11 and the rotor 33 are integrally formed.

[0025] In some embodiments, a sleeve 51 is fixedly arranged at the center of the lower housing 5, a piston bushing 52 is arranged on the inner wall of the sleeve 51, and the piston 13 is arranged in the piston bushing 52 and is slidably connected to the piston bushing 52.

[0026] In some embodiments, an anti-rotation sleeve 53 that prevents the piston 13 from rotating relative to the lower housing 5 is provided on the inner wall of the end of the sleeve 51 away from the rotor 33. A first anti-rotation surface 531 is provided on the inner wall of the anti-rotation sleeve 53, and a second anti-rotation surface 131 that matches the first anti-rotation surface 531 is provided on the outer wall of the piston 13. When the piston 13 passes through the anti-rotation sleeve 53, the first anti-rotation surface 531 and the second anti-rotation surface 131 are correspondingly arranged; the first anti-rotation surface 531 and the second anti-rotation surface 131 allow the piston 13 to axially move relative to the lower housing 5 and prevent the piston 13 from rotating relative to the lower housing 5.

[0027] In some embodiments, both the electromagnet 23 and the moving iron core 22 are annularly sleeved or partially sleeved on the outer wall of the sleeve 51, and the electromagnet 23 is fixed to the lower housing 5 by a first bolt 231.

[0028] In some embodiments, a third anti-rotation surface 221 is provided on the inner wall of the moving iron core 22, and a fourth anti-rotation surface that matches the third anti-rotation surface 221 is provided on the part of the outer wall of the rotor 33 connected to the moving iron core 22. When the moving iron core 22 is sleeved onto the rotor 33, the third anti-rotation surface 221 and the fourth anti-rotation surface are correspondingly arranged; the third anti-rotation surface 221 and the fourth anti-rotation surface allow the moving iron core 22 to axially move relative to the rotor 33 and prevent the moving iron core 22 from rotating relative to the rotor 33.

[0029] In some embodiments, the rotor 33 is arranged in the outer housing 31 through a support bearing 34 at the end close to the upper housing 4. The support bearing 34 is installed in the outer housing 31 through a lock nut 341. A magnet seat 35 is provided at the end of the rotor 33 connected to the support bearing 34, and a magnet 36 is provided on the magnet seat 35; an electromagnetic angle sensor 41 is fixed on the side of the upper housing 4 close to the outer housing 31, and the electromagnetic angle sensor 41 cooperates with the magnet 36 to detect the rotation angle of the rotor 33.

[0030] In some embodiments, a driving control terminal 311 is provided on the outer housing 31. The driving control terminal 311 is electrically connected to the stator 32 and the electromagnetic angle sensor 41, and the driving control terminal 311 realizes the input and output of driving control signals.

[0031] In some embodiments, a parking control terminal 312 is provided on the outer housing 31. The parking control terminal 312 is electrically connected to the electromagnet 23, and the parking control terminal 312 realizes the input and output of parking control signals.

[0032] In some embodiments, the upper housing 4 is fixed to the outer housing 31 by a second bolt 42, and an upper housing sealing ring 43 is provided at the connection between the upper housing 4 and the outer housing 31; the outer housing 31 and the lower housing 5 are connected to the housing of the caliper 6 through a third bolt 54, and a lower housing sealing ring 55 is provided at the connection between the lower housing 5 and the outer housing 31.

[0033] In some embodiments, the piston 13 is connected to the caliper 6. The pressure arm 62 of the caliper 6 is connected to one end of the actuating push rod 61, and the other end of the actuating push rod 61 is disposed in the piston 13. The movement of the piston 13 drives the actuating push rod 61 to press or release the pressure arm 62 to achieve vehicle braking and release.

[0034] In summary, the braking device provided by the present invention, which combines vehicle braking and parking braking, is provided with a hollow motor, and the vehicle braking structure 1 and the parking braking structure 2 are integrated in the hollow motor, so as to simplify the structure and reduce the product size while realizing vehicle braking and parking braking, which is beneficial to the wide application of the braking device.

[0035] Although the specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure of the present invention, even when describing a single embodiment with respect to a specific feature. The feature examples provided in the disclosure of the present invention are intended to be illustrative rather than restrictive, unless otherwise stated. In specific implementations, according to actual needs and where technically feasible, the technical features of one or more dependent claims can be combined with the technical features of the independent claim, and can be combined in any appropriate way rather than only through the specific combinations listed in the claims from the technical features of the corresponding independent claim.

[0036] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A braking device that combines service braking and parking braking, characterized in that, It includes a hollow motor and a service brake structure and a parking brake structure arranged in the hollow motor. The hollow motor includes a motor main body, an upper housing and a lower housing that enclose the motor main body. The motor main body includes a housing, a stator and a rotor. The stator is arranged closely against the inner wall of the housing. The rotor is arranged at the center of the housing, and the rotor is in a hollow cylindrical structure. The service brake structure is arranged in the rotor and driven by the rotation of the rotor to move axially along the axis of the rotor. The service brake structure is connected to a caliper. The parking brake structure includes a moving iron core and an electromagnet arranged coaxially. The moving iron core is partially sleeved on the outer wall of the rotor and only allows the moving iron core to move axially along the rotor. The electromagnet is fixed to the inner side of the lower housing. When the electromagnet is energized, the moving iron core is separated from the electromagnet, allowing the moving iron core to rotate with the rotor. When the hollow motor starts, the rotor rotates and then drives the service brake structure to move axially to drive the caliper to achieve service braking and release. When the electromagnet is de-energized, the moving iron core is attracted to the electromagnet, preventing the moving iron core and the rotor from rotating, thus achieving parking braking.

2. The braking device with both service braking and parking braking according to claim 1, characterized in that, The service brake structure includes a lead screw nut, a lead screw and a piston. The lead screw nut is fixed to the inner wall of the rotor. The lead screw is arranged in the lead screw nut, and the lead screw is connected to the piston. The piston is arranged at the center of the lower housing and is movably connected to the lower housing, so that the piston can move axially in the lower housing.

3. The braking device with both service braking and parking braking according to claim 2, characterized in that, A sleeve is fixedly arranged at the center of the lower housing. A piston bushing is arranged on the inner wall of the sleeve. The piston is arranged in the piston bushing and is slidably connected to the piston bushing.

4. The braking device with both service braking and parking braking according to claim 3, characterized in that, A rotation prevention sleeve for preventing the piston from rotating relative to the lower housing is arranged on the inner wall of the end of the sleeve away from the rotor. A first rotation prevention surface is arranged on the inner wall of the rotation prevention sleeve. A second rotation prevention surface matching the first rotation prevention surface is arranged on the outer wall of the piston. When the piston passes through the rotation prevention sleeve, the first rotation prevention surface and the second rotation prevention surface are correspondingly arranged. The first rotation prevention surface and the second rotation prevention surface allow the piston to move axially relative to the lower housing and prevent the piston from rotating relative to the lower housing.

5. The braking device with both service braking and parking braking according to claim 3, characterized in that, Both the electromagnet and the moving iron core are annularly sleeved or partially sleeved on the outer wall of the sleeve. The electromagnet is fixed to the lower housing by a first bolt.

6. The braking device with both driving braking and parking braking according to claim 1, characterized in that, A third rotation prevention surface is arranged on the inner wall of the moving iron core. A fourth rotation prevention surface matching the third rotation prevention surface is arranged on the part of the outer wall of the rotor connected to the moving iron core. When the moving iron core is sleeved on the rotor, the third rotation prevention surface and the fourth rotation prevention surface are correspondingly arranged. The third rotation prevention surface and the fourth rotation prevention surface allow the moving iron core to move axially relative to the rotor and prevent the moving iron core from rotating relative to the rotor.

7. The braking device with both service braking and parking braking according to claim 1, characterized in that, The rotor is arranged in the housing at the end close to the upper housing through a support bearing. The support bearing is installed in the housing through a lock nut. A magnet seat is arranged at the end of the rotor connected to the support bearing, and a magnet is arranged on the magnet seat. An electromagnetic angle sensor is fixed to the side of the upper housing close to the housing.

8. The braking device with both service braking and parking braking according to claim 7, characterized in that, The housing is provided with driving control terminals, and the driving control terminals are electrically connected to the stator and the electromagnetic angle sensor; the housing is provided with parking control terminals, and the parking control terminals are electrically connected to the electromagnet.

9. The braking device with both service braking and parking braking according to claim 1, characterized in that, The upper housing is fixed to the housing by second bolts, and an upper housing sealing ring is arranged at the connection between the upper housing and the housing; the housing and the lower housing are connected to the housing of the caliper by third bolts, and a lower housing sealing ring is arranged at the connection between the lower housing and the housing.

10. The braking device with both driving braking and parking braking according to claim 2, characterized in that, The piston is connected to the caliper, the pressure arm of the caliper is connected to one end of the actuating push rod, and the other end of the actuating push rod is arranged in the piston; the movement of the piston drives the actuating push rod to press or release the pressure arm to realize driving braking and release.

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