Overrunning clutch and hub motor

Abstract

The utility model relates to an overrun clutch and a hub motor, the overrun clutch comprises an inner ring and an outer ring, the outer peripheral wall of the inner ring is provided with an inner ball raceway, the inner wall of the outer ring is provided with an outer ball raceway corresponding to the inner ball raceway, and balls are arranged between the inner ball raceway and the outer ball raceway. A roller braking assembly is arranged on the inner wall of the outer ring, a first protection ring is arranged on the end face of one side of the outer ring and extends to the peripheral position of the inner ring, an isolation ring is arranged on the peripheral face of the inner ring and is arranged between the inner ball raceway and the roller braking assembly, and a second protection ring is arranged on the end face of the other side of the outer ring and extends to the peripheral position of the inner ring. The second protection ring extends to the peripheral position of the inner ring, and the first protection ring and the second protection ring are fixedly connected with the end face of the outer ring. According to the overrun clutch, the clutch function can be achieved, the concentricity between the inner ring and the outer ring can be guaranteed, and the sliding resistance of an outer rotor motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of clutches, in particular to an overrunning clutch and a hub motor. Background Art

[0002] An overrunning clutch is a type of clutch that automatically engages and disengages by utilizing the change in speed or rotation direction of the active and passive parts. When the active part drives the passive part to rotate together, it is called the engaged state; when the active and passive parts disengage and rotate at their own speeds, it is called the overrunning state.

[0003] The patent with the publication number CN215890866U discloses an overrunning clutch, whose structure includes components such as an inner ring, an outer ring, rolling elements, special-shaped wedges, wedge retainers, tension springs, retaining rings, and sealing rings. A first raceway and a second raceway are provided on the outer ring, and an oil replenishing cavity is also provided on the outer ring. An oil outlet hole is provided on the first raceway, and the solid grease in the oil replenishing cavity can enter the first raceway through the oil outlet hole to lubricate the rolling elements. A retaining ring is also provided next to the wedge retainer, and the wedge retainer is axially limited by the retaining ring. Sealing grooves are provided on both sides of the inner circumferential wall of the outer ring, and sealing rings are provided in the sealing grooves for interference fit, and the rolling elements and special-shaped wedges and other components can be sealed and protected by the sealing rings. The disadvantage of this overrunning clutch is that the structure is complex, and the concentricity of the inner ring and the outer ring is poor. When used in an outer rotor brushless motor, it will cause large sliding resistance, so it needs to be improved. Summary of the invention

[0004] The first purpose of the utility model is to provide an overrunning clutch with a simplified structure and low sliding resistance when used in an outer rotor brushless motor, in order to solve the problems existing in the overrunning clutch described in the background technology, while ensuring the concentricity of the inner ring and the outer ring.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] An overrunning clutch comprises an inner ring and an outer ring, wherein the inner ring is arranged inside the outer ring, an axial hole is arranged in the middle of the inner ring, an inner ball raceway is arranged on the outer peripheral wall of the inner ring, an outer ball raceway corresponding to the inner ball raceway is arranged on the inner wall of the outer ring, balls are arranged between the inner ball raceway and the outer ball raceway, the inner side end and the outer side end of the balls are respectively in the inner ball raceway and the outer ball raceway, a roller brake assembly is arranged on the inner wall of the outer ring, a first protective ring is arranged on one side end face of the outer ring, and the first protective ring extends to the inner The outer periphery of the ring, the first protective ring is used for sealing and protecting the inner ball raceway and the outer ball raceway, an isolation ring is provided on the outer periphery of the inner ring, the isolation ring is arranged between the inner ball raceway and the roller brake assembly, the isolation ring is used for isolating the ball from the roller brake assembly, a second protective ring is provided on the other side end face of the outer ring, the second protective ring extends to the outer periphery of the inner ring, the second protective ring is used for sealing and protecting the roller brake assembly, the first protective ring and the second protective ring are fixedly connected to the end face of the outer ring respectively.

[0007] In the above scheme, the roller brake assembly includes a roller and a flat spring, and a plurality of assembly grooves of the roller brake assembly are provided on the inner wall of the outer ring, the roller is fixedly connected to one end of the flat spring, and the other end of the flat spring is fixedly connected to a side wall of the assembly groove, and in the assembly groove, the depth of the assembly groove in the radial direction of the outer ring gradually increases from the roller side to the flat spring side. Through this arrangement, the use of the roller brake assembly can make the overrunning clutch have unidirectional power transmission, and can be disengaged when rotating in the reverse direction or at a slow speed.

[0008] In the above solution, the first protective ring and the second protective ring are riveted or welded to the end face of the outer ring respectively. Through this arrangement, the assembly of the first protective ring and the second protective ring is more secure, and the first protective ring and the second protective ring can seal and protect the ball and roller brake assembly to prevent dust pollution.

[0009] In the above solution, the isolation ring is welded to the inner ring or formed integrally. Through this arrangement, the isolation ring can isolate the ball and roller brake components to prevent mutual interference between the two.

[0010] In the above solution, the isolation ring is arranged on the outer peripheral surface of the inner ring near the inner ball raceway. This arrangement can prevent the balls from escaping from the raceway, thereby improving the isolation effect.

[0011] In the above scheme, a ball cage is provided between the inner ball raceway and the outer ball raceway, and a plurality of ball positioning parts corresponding to the balls are provided on the ball cage. By providing the ball cage, the relative position between the balls can be restricted, the stability of the spacing between the balls can be ensured, and the concentricity of the inner ring and the outer ring can be ensured.

[0012] The second invention objective of the utility model is to provide a hub motor using the above-mentioned overrunning clutch.

[0013] In the above scheme, the hub motor includes a main shaft, a wheel hub, an overrunning clutch, a card base assembly and a sleeve. The main shaft passes through the shaft hole of the inner ring of the overrunning clutch, and the main shaft is fixedly connected to the inner ring of the overrunning clutch. The outer ring of the overrunning clutch is provided with a connecting shaft for connecting the planetary gear. On the main shaft, a sleeve is provided next to the inner ring of the overrunning clutch, and the sleeve is fixedly connected to the inner ring of the bearing, the outer ring of the bearing is fixedly connected to the left side of the card base assembly, and the card base assembly is fixedly connected to the wheel hub.

[0014] The utility model has positive effects: 1) The overrunning clutch of the utility model forms a structure similar to a deep groove ball bearing by arranging an inner ring raceway on the outer periphery of the inner ring, arranging an outer ring raceway on the inner wall of the outer ring, and arranging balls between the inner ring raceway and the outer ring raceway. Through this arrangement, the concentricity between the inner ring and the outer ring can be guaranteed; 2) The overrunning clutch of the utility model arranges a roller brake assembly between the inner ring and the outer ring, and the clutch function of the inner ring and the outer ring is realized by the roller brake assembly, so as to realize the overrunning state and the engagement state of the overrunning clutch; 3) The overrunning clutch of the utility model arranges a first protective ring and a second protective ring on the end faces on both sides of the outer ring, respectively, to seal and protect the ball and the roller brake assembly, thereby preventing external dust and other pollutants from polluting the internal components of the overrunning clutch and extending the service life of the overrunning clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front structure of the overrunning clutch of the utility model.

[0016] Figure 2 It is a schematic diagram of the rear structure of the overrunning clutch of the utility model.

[0017] Figure 3 This is a schematic diagram of the assembly structure of the roller brake assembly of the utility model in the outer ring.

[0018] Figure 4 It is a cross-sectional structural schematic diagram of the utility model.

[0019] Figure 5 This is an application embodiment of the overrunning clutch of the utility model.

[0020] The reference numerals in the figure are inner ring 1, inner ball raceway 11, outer ring 2, outer ball raceway 21, assembly groove 22, roller 23, flat spring 24, connecting shaft 25, ball 3, first protective ring 4, isolation ring 5, second protective ring 6, ball retainer 7, main shaft 8, sleeve 81, bearing 82, wheel hub 9, and card base assembly 10. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is described clearly and completely below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-4 As shown, the overrunning clutch of the utility model comprises an inner ring 1 and an outer ring 2 , wherein the inner ring 1 is arranged inside the outer ring 2 .

[0023] The inner ring 1 and the outer ring 2 can be made of the materials used in existing overrunning clutches. The inner ring 1 and the outer ring 2 are both annular parts, and the thickness of the inner ring 1 and the outer ring 2 is the same.

[0024] An axial hole is provided in the middle of the inner ring, and an inner ball raceway 11 is provided on the outer peripheral wall of the inner ring 1. As shown in the attached figure, the inner ball raceway 11 is provided on the outer wall of the inner ring 1 near the left end, and an outer ball raceway 21 is provided on the inner peripheral wall of the outer ring 2. The position of the outer ball raceway 21 corresponds to the position of the inner ball raceway 11, and balls 3 are provided between the inner ball raceway 11 and the outer ball raceway 21. As a preferred solution, a ball retainer 7 is provided between the inner ball raceway 11 and the outer ball raceway 21, and the ball retainer 7 is provided with a plurality of ball positioning parts corresponding to the balls 3. By providing the ball retainer 7, the relative positions of the balls 3 can be limited, the stability of the spacing between the balls can be ensured, and the concentricity of the inner ring and the outer ring can be ensured.

[0025] A roller brake assembly is provided on the inner wall of the outer ring 2. Specifically, a plurality of assembly grooves 22 of the roller brake assembly are provided on the inner wall of the outer ring 2. The roller 23 is fixedly connected to one end of the flat spring 24. The other end of the flat spring 24 is fixedly connected to a side wall of the assembly groove 22. In the assembly groove 22, the depth of the assembly groove 22 in the radial direction of the outer ring gradually increases from the roller 23 side to the flat spring 24 side. In a static state, the flat spring 24 presses against the roller 23, so that the roller 23 presses against the outer peripheral wall of the inner ring 1 and the inner wall of the outer ring 2. When the roller 23 moves toward the direction of the flat spring 24, the power transmission between the inner ring 1 and the outer ring 2 can be interrupted, so that the inner ring 1 and the outer ring 2 are disengaged and enter the overrunning state; on the contrary, when the roller 23 moves in the direction away from the flat spring 24, the power transmission between the inner ring 1 and the outer ring 2 can be realized, so that the inner ring 1 and the outer ring 2 are combined and enter the combined state. Through this arrangement, the use of a roller brake assembly can enable the overrunning clutch to have one-way power transmission and can be disengaged when rotating in the reverse direction or at a slow speed.

[0026] In practical application, a connecting arm can be provided on the roller 23 to facilitate the connection between the flat spring 24 and the roller 23. When connected, the connecting arm is inserted into the flat spring and the connecting arm and the flat spring are fixedly connected. Similarly, a connecting column can also be provided at the other end of the flat spring to achieve fixed connection between the flat spring and the assembly groove.

[0027] A first protective ring 4 is provided on one side end face of the outer ring 2. The first protective ring 4 extends to the outer periphery of the inner ring 1. The first protective ring 4 is used for sealing and protecting the inner ball raceway 11 and the outer ball raceway 21. An isolation ring 5 is provided on the outer periphery of the inner ring 1. The isolation ring 5 is arranged between the inner ball raceway 11 and the roller brake assembly. The isolation ring 5 is used for isolating the ball 3 from the roller brake assembly. The isolation ring 5 is welded to the inner ring 1 or formed as one piece. The isolation ring 5 is preferably arranged on the outer periphery of the inner ring 1 near the inner ball raceway 11.

[0028] A second protective ring 6 is provided on the other side end face of the outer ring 2. The second protective ring 6 extends to the outer periphery of the inner ring 1. The second protective ring 6 is used for sealing protection of the roller brake assembly. The first protective ring 4 and the second protective ring 6 are respectively fixedly connected to the end faces of the outer ring 2, and the connection method can be welding or riveting.

[0029] The overrunning clutch of the utility model can be applied to an outer rotor brushless motor when in use, and the transmission of the motor torque is achieved through the overrunning clutch.

[0030] As attached Figure 5 As shown, the outer rotor hub motor includes a main shaft 8, a hub 9, an overrunning clutch, a base assembly 10 and a sleeve 81. The main shaft 8 passes through the shaft hole of the inner ring of the overrunning clutch. The main shaft 8 is fixedly connected to the inner ring 1 of the overrunning clutch. The outer ring 2 of the overrunning clutch is provided with a connecting shaft 25 for connecting the planetary gear. On the main shaft 8, a sleeve 81 is provided next to the inner ring 1 of the overrunning clutch. The sleeve 81 is fixedly connected to the inner ring of the bearing 82, or the sleeve 81 and the inner ring of the bearing 82 are integrally formed. The outer ring of the bearing 82 is fixedly connected to the left side of the base assembly 10, and the base assembly 10 is fixedly connected to the hub 9.

[0031] The working principle of the outer rotor hub motor is as follows: the motor rotor is fixedly connected to the sun gear on the main shaft, driving the sun gear to rotate, the planetary gear meshes with the sun gear, and the sun gear drives the planetary gear to rotate, and the planetary gear meshes with the inner gear ring on the inner wall of the hub to drive the hub to rotate. The planetary gear is set on the connecting shaft on the outer ring of the overrunning clutch. The planetary gear rotates around the sun gear and drives the outer ring of the overrunning clutch to rotate. The outer ring and inner ring of the overrunning clutch are in an overrunning state, and the power transmission is disengaged; when the power supply of the motor is turned off, the rotation of the main shaft can drive the inner ring of the overrunning clutch to rotate, and the overrunning clutch is in a coupled state, driving the outer ring of the clutch to rotate, and then driving the hub to rotate through the planetary gear.

[0032] Although Figure 5 The complete structure of the wheel hub motor is not shown, but the installation position and connection structure of the overrunning clutch in the wheel hub motor are shown. Those skilled in the art can modify and design other components and structures of the wheel hub motor according to design requirements. For example, the wheel hub motor structure described in the patent document with publication number CN 101989801B can be referred to.

[0033] Figure 5 The scheme shown is only an application embodiment of the overrunning clutch of the utility model. Those skilled in the art can design a hub motor with other structures of the overrunning clutch of the utility model as needed.

[0034] The overrunning clutch of the utility model forms a structure similar to a deep groove ball bearing by arranging an inner ring raceway on the outer periphery of the inner ring, arranging an outer ring raceway on the inner wall of the outer ring, and arranging balls between the inner ring raceway and the outer ring raceway. Through this arrangement, the concentricity between the inner ring and the outer ring can be guaranteed, thereby reducing the resistance of the outer rotor motor in the sliding state.

[0035] The overrunning clutch of the utility model has a roller brake assembly arranged between the inner ring and the outer ring, and the clutch function of the inner ring and the outer ring is realized by the roller brake assembly, so as to realize the overrunning state and the engaging state of the overrunning clutch.

[0036] The overrunning clutch of the utility model is provided with a first protective ring and a second protective ring on both side end faces of the outer ring, respectively, to seal and protect the ball and roller brake components, thereby preventing external dust and other pollutants from contaminating the internal components of the overrunning clutch and extending the service life of the overrunning clutch.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An overrunning clutch, characterized in that: The invention comprises an inner ring and an outer ring, wherein the inner ring is arranged inside the outer ring, an axial hole is arranged in the middle part of the inner ring, an inner ball raceway is arranged on the outer peripheral wall of the inner ring, an outer ball raceway corresponding to the inner ball raceway is arranged on the inner wall of the outer ring, balls are arranged between the inner ball raceway and the outer ball raceway, the inner and outer ends of the balls are respectively inside the inner ball raceway and the outer ball raceway, a roller brake assembly is arranged on the inner wall of the outer ring, a first protective ring is arranged on an end face of one side of the outer ring, the first protective ring extends to the outer peripheral position of the inner ring, the first protective ring is used for sealing protection of the inner ball raceway and the outer ball raceway, an isolation ring is arranged on the outer peripheral surface of the inner ring, the isolation ring is arranged between the inner ball raceway and the roller brake assembly, the isolation ring is used for isolating the balls from the roller brake assembly, a second protective ring is arranged on the other end face of the outer ring, the second protective ring extends to the outer peripheral position of the inner ring, the second protective ring is used for sealing protection of the roller brake assembly, and the first protective ring and the second protective ring are respectively fixedly connected to the end face of the outer ring.

2. The overrunning clutch according to claim 1, characterized in that: The roller brake assembly includes a roller and a flat spring. A plurality of assembly grooves of the roller brake assembly are provided on the inner wall of the outer ring. The roller is fixedly connected to one end of the flat spring, and the other end of the flat spring is fixedly connected to a side wall of the assembly groove. In the assembly groove, the depth of the assembly groove in the radial direction of the outer ring gradually increases from the roller side to the flat spring side.

3. The overrunning clutch according to claim 1, characterized in that: The first protective ring and the second protective ring are respectively connected to the end surface of the outer ring by riveting or welding.

4. The overrunning clutch according to claim 1, characterized in that: The isolation ring is welded to the inner ring or formed integrally.

5. The overrunning clutch according to claim 1, characterized in that: The isolation ring is arranged on the outer peripheral surface of the inner ring near the inner ball raceway.

6. The overrunning clutch according to claim 1, characterized in that: A ball retainer is arranged between the inner ball raceway and the outer ball raceway, and a plurality of ball positioning parts corresponding to the balls are arranged on the ball retainer.

7. A hub motor using the overrunning clutch described in any one of claims 1 to 6.

8. The hub motor according to claim 7, characterized in that: It includes a main shaft, a wheel hub, an overrunning clutch, a card base assembly and a sleeve. The main shaft passes through the shaft hole of the inner ring of the overrunning clutch. The main shaft is fixedly connected to the inner ring of the overrunning clutch. A connecting shaft for connecting the planetary gear is provided on the outer ring of the overrunning clutch. A sleeve is provided on the main shaft next to the inner ring of the overrunning clutch. The sleeve is fixedly connected to the inner ring of the bearing. The outer ring of the bearing is fixedly connected to the left side of the card base assembly. The card base assembly is fixedly connected to the wheel hub.

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