Hysteresis overrunning clutch

Abstract

The hysteresis overrun clutch comprises an outer ring, a shifting fork and an inner ring, the outer ring is arranged outside the inner ring, the shifting fork is arranged between the outer ring and the inner ring, a plurality of star wheel planes are evenly arranged on the outer circle of the inner ring, tooth grooves are evenly formed in the shifting fork, pin rollers are arranged in the tooth grooves, and the pin rollers can freely rotate in the tooth grooves; a pin shaft is arranged in the radial direction of the matching position of the shifting fork and the inner ring, a plurality of magnetic steel is evenly embedded in the outer circle of the shifting fork along the circumference, an annular stator is arranged outside the magnetic steel, a coil is embedded in the annular stator, the annular stator does not make contact with the outer circumference of the magnetic steel and the outer circumference of the shifting fork, and radial gaps are formed between the annular stator and the outer circumference of the magnetic steel and between the annular stator and the outer circumference of the shifting fork. The inner ring and the outer ring are connected with the driving end and the driven end through key grooves or threads respectively, the annular stator is fixed and does not rotate, and the functions of two-way overrunning and two-way torque transmission of the clutch are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of overrunning clutches, and in particular relates to a hysteresis overrunning clutch. Background Art

[0002] For a self-powered electric locomotive, the motor drives the wheels forward or backward when it is working normally; when the locomotive breaks down and needs to be repaired, it needs to be towed forward or backward by an external locomotive. At this time, the wheels cannot rotate against the motor, otherwise the motor will be damaged. This requires a clutch to be installed between the motor and the wheel. When being towed by the external locomotive, the motor and the wheel are disengaged and the motor will not be driven to rotate. Moreover, the locomotive can follow the external locomotive regardless of whether it moves forward or backward. When the motor is working, it automatically combines to transmit torque to drive the wheels forward or backward. In this case, only mechanical or electromagnetic clutches can be used to achieve wedging / disengagement operations through control, but the mechanical clutch is complex to control and the electromagnetic clutch is large in size, so it is impossible to achieve self-wedging and disengagement. Summary of the invention

[0003] The object of the present invention is to provide a hysteresis overrunning clutch, which can achieve overrunning in both forward and reverse directions when the active end is stationary; and when the active end is rotating, the clutch can transmit torque in both forward and reverse directions, that is, a clutch that can automatically achieve two-way overrunning and two-way torque transmission to solve the problems mentioned in the background technology.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hysteresis overrunning clutch, comprising an outer ring, a shift fork, and an inner ring, wherein the outer ring is arranged outside the inner ring, a shift fork is arranged between the outer ring and the inner ring, a plurality of star wheel planes are evenly arranged on the outer circle of the inner ring, tooth grooves are evenly arranged on the shift fork, the number of the tooth grooves is equal to the number of the star wheel planes, and a star wheel plane corresponds to each tooth groove position, and rollers are arranged in the tooth grooves, and the rollers can rotate freely in the tooth grooves; A pin is provided in the radial direction of the matching part between the shift fork and the inner ring, a groove is provided at one end of the inner ring where the pin extends, and the pin extends into the groove, threaded holes are provided on both sides of the groove, and an adjusting screw and a spring arranged at one end of the adjusting screw are arranged in the threaded holes, and the springs are respectively arranged on both sides of the pin, and the front end of the spring is in contact with the pin; A plurality of magnets are evenly inlaid along the circumference of the outer circle of the shift fork, an annular stator is arranged outside the magnet, a coil is embedded on the annular stator, the annular stator does not contact the magnet and the outer circumference of the shift fork, and a radial gap is arranged.

[0005] A further improvement is that the outer ring and the inner ring are supported by a bearing on one side and are ensured to be concentric and the outer ring and the inner ring can rotate independently.

[0006] A further improvement is that the shift fork is clearance-matched with the outer circle of one side of the inner ring, and the shift fork and the inner ring are concentric and can rotate relative to each other.

[0007] A further improvement is that the annular stator is fixed to the external frame and does not rotate.

[0008] A further improvement is that the width of the groove is greater than the diameter of the pin shaft, and the pin shaft can swing in the groove.

[0009] A further improvement is that the width of the tooth groove is greater than the diameter of the roller.

[0010] A further improvement is that the star wheel planes are symmetrically distributed along the central plane of the inner ring.

[0011] A further improvement is that the bearing is axially limited by a shaft clamp and a hole clamp arranged on one side of the bearing.

[0012] A further improvement is that the pins are arranged on the inner ring symmetrically at 180° between each other.

[0013] A further improvement is that the inner ring and the outer ring are connected to the external active end and the passive end respectively through keyways or threads.

[0014] Beneficial technical effects of the present invention: When in use, the inner ring and the outer ring are respectively connected to the active and passive ends through keyways or threads, and the annular stator is fixed and does not rotate. At this time, when the active end is stationary, the clutch disengages the active and passive ends, and the passive end can rotate freely in either forward or reverse direction, that is, the clutch realizes a two-way overrunning function; and when the active end is driven, the passive end can be driven to rotate in either forward or reverse direction, that is, the clutch realizes a two-way torque transmission function, which overcomes the shortcomings of existing solutions and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the hysteresis overrunning clutch of the present invention; Figure 2 for Figure 1 AA section view; Figure 3 for Figure 1 BB cross-sectional view; Figure 4 This is a schematic diagram of the clockwise torque transmission of the inner ring of the hysteresis overrunning clutch of the present invention; Figure 5 Schematic diagram of the counterclockwise torque transmission of the inner ring of the hysteresis overrunning clutch of the present invention; Figure numerals: 1-outer ring, 2-shift fork, 3-inner ring, 4-roller, 5-annular stator, 6-pin shaft, 7-spring, 8-adjusting screw, 9-magnet, 10-coil, 11-shaft clamp, 12-bearing, 13-hole clamp, 14-tooth groove, 15-star wheel plane, 16-groove. DETAILED DESCRIPTION

[0016] The present application is further described in detail below in conjunction with the accompanying drawings.

[0017] like Figures 1 to 5 As shown, a hysteresis overrunning clutch comprises an outer ring 1, a shift fork 2, and an inner ring 3, wherein the outer ring 1 is arranged outside the inner ring 3, the shift fork 2 is arranged between the outer ring 1 and the inner ring 3, a plurality of star wheel planes 15 are evenly arranged on the outer circle of the inner ring 3, the shift fork 2 is evenly arranged with tooth grooves 14, the number of the tooth grooves 14 is equal to the number of the star wheel planes 15, and a star wheel plane 15 corresponds to the position of each tooth groove 14, and rollers 4 are arranged in the tooth grooves 14, and the rollers 4 can rotate freely in the tooth grooves 14; A pin shaft 6 is provided in the radial direction of the matching position of the shift fork 2 and the inner ring 3. A groove 16 is provided at one end of the inner ring 3 where the pin shaft 6 extends, and the pin shaft 6 extends into the groove 16. Threaded holes are provided on both sides of the groove 16. Adjustment screws 8 and springs 7 arranged at one end of the adjustment screws 8 are arranged in the threaded holes. The springs 7 are respectively arranged on both sides of the pin shaft 6, and the front end of the spring 7 is in contact with the pin shaft 6. A plurality of magnets 9 are evenly inlaid along the circumference of the outer circle of the fork 2, an annular stator 5 is arranged outside the magnet 9, a coil 10 is embedded in the annular stator 5, and the annular stator 5 does not contact the magnet 9 and the outer circumference of the fork 2, and a radial gap is arranged.

[0018] Specifically, the outer ring 1 and the inner ring 3 are supported by a bearing 12 on one side and ensured to be concentric and able to rotate independently. The fork 2 is matched with the outer circle clearance on one side of the inner ring 3, and the fork 2 is concentric with the inner ring 3 and can rotate relatively.

[0019] The width of the groove 16 is greater than the diameter of the pin 6 , and the pin 6 can swing in the groove 16 . The width of the tooth groove 14 is greater than the diameter of the roller 4 .

[0020] The star wheel planes 15 are symmetrically distributed along the center plane of the inner ring 3 .

[0021] The bearing 12 is axially limited by a shaft clamp 11 and a hole clamp 13 arranged on one side of the bearing 12 .

[0022] The pins 6 are symmetrically arranged on the inner ring 3 at 180° between each other.

[0023] In one implementation, the specific working process and principle are as follows: When in use, the inner ring 3 and the outer ring 1 are respectively connected to the active end and the passive end of the outside through keyways or threads, and the annular stator 5 is fixed to the external frame and does not rotate.

[0024] To achieve the two-way overrunning function: a pin 6 is radially arranged at the matching position between the fork 2 and the inner ring 3. The pin 6 is aligned with the center surface of a tooth groove 14. In order to balance the force, the pin 6 is generally symmetrically arranged at 180°. A groove 16 is opened at the corresponding position of the inner ring 3 where the pin 6 extends. The center surface of the groove 16 is aligned with the center of a star wheel plane 15. The width of the groove 16 is greater than the pin 6. The pin 6 penetrates into the groove 16. The pin 6 can swing limitedly in the groove 16. Threaded holes are arranged on the entities on both sides of the groove 16, and a spring 7 and an adjusting screw 8 are arranged inside. The spring 7 is pressed on both sides of the pin 6. The elastic force of the spring 7 is adjusted by adjusting the screw 8. The fork 2 can be adjusted by the elastic force of the spring 7 to keep the roller 4 in the middle position of the star wheel plane 15. At this time, the outer ring 1 is not in contact with the roller 4 and the inner ring 3, and the outer ring 1 can rotate freely in the forward and reverse directions to achieve the two-way overrunning function.

[0025] To achieve the bidirectional torque transmission function: the shift fork 2 is also inlaid with a number of magnetic steels 9 on the circumference, and an annular stator 5 and a coil 10 are arranged on the outer circumference of the magnetic steel 9. The annular stator 5 is fixed to the frame and does not rotate, and a slight radial gap is retained with the outer circle of the shift fork 2 and the magnetic steel 9. When the inner ring 3 rotates, the spring 7 and the pin 6 drive the shift fork 2 and its magnetic steel 9 to rotate together, and the coil 10 cuts the magnetic lines to generate an induced current and form an electromagnetic field. The interaction of the magnetic field generates damping on the rotation of the shift fork 2. When the damping is greater than the spring force, the shift fork 2 and the inner ring 3 deflect to shift the roller 4 to one side of the star wheel plane 15. The roller 4 contacts the inner ring 3 and the outer ring 1 at the same time, and the torque transmission state of the one-way clutch is achieved, that is, the inner ring 3 drives the outer ring 1 to transmit torque. Since the star wheel plane 15 is symmetrically distributed along the center plane of the inner ring 3, no matter whether the inner ring 3 rotates forward or backward, it will drive the outer ring 1 to transmit torque, thus achieving the bidirectional torque transmission function. (When used at low speeds, in order to avoid the lag of the induced magnetic field, the coil 10 can be powered at the same time when the active end is started, and the passive end is then driven to rotate.) At this point, a hysteresis overrunning clutch of the present invention realizes the functions of bidirectional overrunning and bidirectional torque transmission.

Claims

1. A hysteresis overrunning clutch, comprising an outer ring (1), a shift fork (2), and an inner ring (3), characterized in that: The outer ring (1) is arranged outside the inner ring (3); a shift fork (2) is arranged between the outer ring (1) and the inner ring (3); a plurality of star wheel planes (15) are evenly arranged on the outer circle of the inner ring (3); tooth grooves (14) are evenly arranged on the shift fork (2); the number of the tooth grooves (14) is equal to the number of the star wheel planes (15), and a star wheel plane (15) corresponds to the position of each tooth groove (14); rollers (4) are arranged in the tooth grooves (14), and the rollers (4) can rotate freely in the tooth grooves (14); A pin shaft (6) is provided in the radial direction of the mating portion of the shift fork (2) and the inner ring (3); a groove (16) is provided at one end of the inner ring (3) from which the pin shaft (6) extends, and the pin shaft (6) extends into the groove (16); threaded holes are provided on both sides of the groove (16); an adjusting screw (8) and a spring (7) provided at one end of the adjusting screw (8) are provided in each of the threaded holes; the spring (7) is provided on both sides of the pin shaft (6) and the front end of the spring (7) is in contact with the pin shaft (6); A plurality of magnetic steels (9) are evenly inlaid along the circumference of the outer circle of the shift fork (2); an annular stator (5) is arranged outside the magnetic steel (9); a coil (10) is embedded in the annular stator (5); the annular stator (5) is not in contact with the magnetic steel (9) and the outer circumference of the shift fork (2), and a radial gap is provided.

2. A hysteresis overrunning clutch according to claim 1, characterized in that: The outer ring (1) and the inner ring (3) are supported by a bearing (12) on one side and are ensured to be concentric and the outer ring (1) and the inner ring (3) can rotate independently.

3. A hysteresis overrunning clutch according to claim 1, characterized in that: The shift fork (2) is clearance-matched with the outer circle of one side of the inner ring (3), and the shift fork (2) and the inner ring (3) are concentric and can rotate relative to each other.

4. The hysteresis overrunning clutch according to claim 1, characterized in that: The annular stator (5) is fixed to the external frame and does not rotate.

5. The hysteresis overrunning clutch according to claim 1, characterized in that: The width of the groove (16) is greater than the diameter of the pin shaft (6), and the pin shaft (6) can swing in the groove (16).

6. The hysteresis overrunning clutch according to claim 1, characterized in that: The width of the tooth groove (14) is greater than the diameter of the roller (4).

7. The hysteresis overrunning clutch according to claim 1, characterized in that: The star wheel plane (15) is arranged symmetrically along the central plane of the inner ring (3).

8. The hysteresis overrunning clutch according to claim 2, characterized in that: The bearing (12) is axially limited by a shaft clamp (11) and a hole clamp (13) arranged on one side of the bearing (12).

9. The hysteresis overrunning clutch according to claim 5, characterized in that: The pin shafts (6) are symmetrically arranged on the inner ring (3) at an angle of 180° between each other.

10. The hysteresis overrunning clutch according to claim 1, characterized in that: The inner ring (3) and the outer ring (1) are respectively connected to the external active end and passive end via keyways or threads.

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