Belt wheel key groove locking structure

Abstract

The invention provides a belt wheel key groove locking structure. The belt wheel key groove locking structure comprises a motor, a fixing plate for fixing the motor, a protective cover installed on the fixing plate, a locking sleeve connected to an output shaft of the motor in a sleeving mode, a steering sleeve connected to the locking sleeve in a sleeving mode, a sleeve connected to the steering sleeve in a sleeving mode and a belt wheel connected to the sleeve in a sleeving mode. The locking sleeve comprises an upper shaft sleeve and a lower shaft sleeve, the upper shaft sleeve and the lower shaft sleeve are both provided with plungers, the upper shaft sleeve is further provided with a son buckle, the lower shaft sleeve is further provided with a mother buckle matched with the son buckle, U-shaped grooves are formed in the positions, located at the son buckle and the mother buckle, of the upper shaft sleeve and the lower shaft sleeve, and a key groove is further formed in the lower shaft sleeve. The upper shaft sleeve and the lower shaft sleeve are semi-arc-shaped; a gap is reserved between the upper shaft sleeve and the lower shaft sleeve; a flat key matched with the output shaft is further arranged in the key groove. The locking sleeve is designed in a split mode and is composed of an upper shaft sleeve and a lower shaft sleeve which are connected in a matched mode through a son buckle and a mother buckle.

Description

Technical Field

[0001] The present invention relates to a locking structure for a pulley keyway, and particularly to a locking technology field. Background Art

[0002] In a mechanical transmission system, a locking structure for a pulley keyway is a common device for connecting a motor output shaft and a pulley; the traditional locking structure usually uses the rotation of a screw to generate an axial tension force, so that a locking sleeve squeezes the output shaft, thereby realizing the fixed connection between the pulley and the output shaft; however, this structure has some obvious defects:

[0003] Since the forces of the locking sleeve and the output shaft both act on the axis of the screw, the screw needs to bear a large load, which easily leads to fatigue damage or fracture of the screw, affecting the reliability of the transmission system;

[0004] The traditional locking sleeve is usually an integral structure and cannot be disassembled and re-paired when needed, which limits its application on some special components.

[0005] The locking sleeve is prone to deformation when bearing a large load. Once the deformed part exceeds the bending angle, the locking sleeve may break. Therefore, pins need to be provided at the bending position to strengthen the support of the deformed position, increasing the complexity of the structure and the manufacturing cost.

[0006] The rotation direction of the traditional pulley completely depends on the rotation direction of the motor. Once the pulley is overloaded, the motor may be in a powered-off stationary state, resulting in motor heating or even short circuit. In addition, the motor can usually achieve forward and reverse rotation control, but in some special occasions, only the pulley is required to rotate in one direction, and the other direction needs to be separated from the motor output shaft. The existing structure cannot adjust the position of the pulley in the steering sleeve as needed, and thus cannot lock the pulley in different rotation directions.

[0007] In summary, the existing locking structure for a pulley keyway has many deficiencies in load-bearing capacity, disassembly, deformation control, rotation direction adjustment, and safety. There is an urgent need for a new locking structure to solve these problems in order to improve the reliability, safety, and applicability of the transmission system. Summary of the Invention

[0008] Object of the Invention: To propose a locking structure for a pulley keyway to solve the above problems existing in the prior art.

[0009] Technical Solution: A locking structure for a pulley keyway, comprising:

[0010] A motor, a fixing plate for fixing the motor, a protective cover mounted on the fixing plate, a locking sleeve sleeved on the output shaft of the motor, a steering sleeve sleeved on the locking sleeve, a sleeve tube sleeved on the steering sleeve, and a pulley sleeved on the sleeve tube;

[0011] The locking sleeve includes an upper shaft sleeve and a lower shaft sleeve. Both the upper shaft sleeve and the lower shaft sleeve are provided with plungers. The upper shaft sleeve is further provided with a male buckle, and the lower shaft sleeve is further provided with a female buckle that cooperates with the male buckle. The upper shaft sleeve and the lower shaft sleeve are provided with U-shaped grooves at the positions of the male and female buckles. The lower shaft sleeve is further provided with a keyway. The upper shaft sleeve and the lower shaft sleeve are in a semi-circular arc shape; there is a gap between the upper shaft sleeve and the lower shaft sleeve; a flat key that cooperates with the output shaft is also provided in the keyway.

[0012] In a further embodiment, the outer surface of the steering sleeve is provided with a first annular groove, a second annular groove, and a groove that are parallel to each other. The grooves are symmetrically arranged on the outer surface of the steering shaft. There is a certain distance between the first annular groove, the second annular groove, and the groove. The outer surface of the steering shaft is further provided with two guiding grooves that are parallel to each other and penetrate through the first arc-shaped groove, the second annular groove, and the groove.

[0013] In a further embodiment, the first annular groove, the second annular groove, and the groove are all provided with limiting teeth at the positions of the guiding grooves. The limiting directions of the limiting teeth in the first annular groove and the limiting teeth in the second annular groove are arranged in opposite directions.

[0014] In a further embodiment, the limiting teeth are movably connected to the steering sleeve. The limiting teeth rotate in a single direction. The protective cover is provided with a through hole at the position of the pulley.

[0015] In a further embodiment, a set screw is provided on one side of the limiting teeth in the groove. The set screw is threadedly connected to the steering sleeve, and the set screw abuts against the limiting teeth.

[0016] In a further embodiment, the inner wall of the steering sleeve is further provided with pin holes that cooperate with the plungers and the U-shaped hole grooves. A pin is provided between the U-shaped groove and the pin hole.

[0017] In a further embodiment, the plungers are respectively and independently threadedly connected to the upper shaft sleeve and the lower shaft sleeve; the inner wall of the pulley is provided with fixing pins that are slidably matched with the guiding grooves.

[0018] Beneficial effects: The present invention proposes a belt pulley keyway locking structure. The locking sleeve adopts a split design and is composed of an upper shaft sleeve and a lower shaft sleeve. The two are connected by the cooperation of a male buckle and a female buckle; so that the locking sleeve can be disassembled and re-paired when needed, solving the limitation that the traditional integral locking sleeve cannot be disassembled;

[0019] A gap is left between the upper bushing and the lower bushing, enabling the locking sleeve to have a certain elastic deformation ability when bearing loads, thus avoiding the fracture problem caused by excessive rigidity; the upper bushing and the lower bushing are provided with U-shaped grooves at the male and female fasteners, and are matched with the pin holes of the steering sleeve through pins, enhancing the support strength of the locking sleeve and preventing the locking sleeve from deforming or breaking when bearing large loads;

[0020] The lower bushing is provided with a keyway, and a flat key matching with the motor output shaft is arranged in the keyway, enabling the locking sleeve to be firmly fixed on the output shaft, avoiding the problem that the screw bears excessive loads in the traditional screw locking structure, and improving the reliability of the structure;

[0021] The outer surface of the steering sleeve is provided with parallel first annular groove, second annular groove and groove, there is a certain distance between these grooves and they are penetrated by a guiding groove, enabling the pulley to slide on the steering sleeve to realize the adjustment of the pulley position; the inner wall of the steering sleeve is provided with pin holes matching with the plunger and the U-shaped groove, and the plunger is respectively and independently threadedly connected with the upper bushing and the lower bushing, enabling the locking sleeve to evenly distribute forces when bearing loads, avoiding local stress concentration and preventing the locking sleeve from deforming or breaking;

[0022] The first annular groove and the second annular groove are provided with limit teeth, and the limit directions of the two are set in opposite directions. The limit teeth are movably connected with the steering sleeve and are designed with single-direction rotation. This structure can prevent the pulley from reversing under overload conditions, ensuring that the pulley can only rotate in one direction and avoiding the abnormal reverse rotation of the motor driving the pulley;

[0023] One side of the limit teeth in the groove is provided with a setscrew. The setscrew is threadedly connected with the steering sleeve and abuts against the limit teeth; the setscrew can adjust the position of the limit teeth in the groove, and further control the release of the position of the limit teeth in the groove on the fixed pin;

[0024] The inner wall of the pulley is provided with a fixed pin that slidably cooperates with the guiding groove of the steering sleeve, enabling the pulley to slide on the steering sleeve and adjust the position of the pulley as needed, realizing the locking of different rotation directions of the pulley and avoiding the abnormal reverse rotation of the motor driving the pulley. Brief Description of the Drawings

[0025] Figure 1 It is the front view of the present invention.

[0026] Figure 2 It is the exploded schematic diagram of the present invention.

[0027] Figure 3 It is the top view of the present invention.

[0028] Figure 4 It is the schematic diagram of the locking sleeve of the present invention.

[0029] Figure 5 It is the partial schematic diagram of the locking sleeve of the present invention.

[0030] Figure 6 Schematic diagram of the steering sleeve of the present invention.

[0031] Figure 7 Schematic diagram of the pulley structure of the present invention.

[0032] The attached parts are marked as: 1. Locking sleeve; 2. Steering sleeve; 3. Pulley; 4. Fixed plate; 5. Protective cover; 11. Upper shaft sleeve; 12. Lower shaft sleeve; 13. Keyway; 14. U-shaped groove; 15. Plunger; 16. Female buckle; 17. Male buckle; 21. First annular groove; 22. Second annular groove; 23. Guide groove; 24. Groove; 25. Limit tooth; 26. Set screw; 27. Pin hole; 31. Fixed pin; 100. Motor; 101. Output shaft. Detailed implementation manners

[0033] The applicant believes that the rotation direction of the traditional pulley completely depends on the rotation direction of the motor. Once the pulley is overloaded, the motor may be in a powered-off stationary state, resulting in the motor overheating or even short-circuiting. In addition, although the motor can usually achieve forward and reverse rotation control, in some special occasions, only one-way rotation of the pulley is required, and the other direction needs to be separated from the motor output shaft. The existing structure cannot adjust the position of the pulley in the steering sleeve as needed, and thus cannot lock the pulley in different rotation directions.

[0034] To solve the problems existing in the prior art, the present invention provides a pulley keyway locking structure, which solves the deficiencies of the traditional locking structure in terms of load-bearing capacity, disassembly, deformation control, rotation direction adjustment, and safety.

[0035] The following further specifically describes the present solution through embodiments and in conjunction with the drawings.

[0036] In the present application, we propose a pulley keyway locking structure, including:

[0037] A motor 100, a fixed plate 4 for fixing the motor 100, a protective cover 5 installed on the fixed plate 4, a locking sleeve 1 sleeved on the output shaft 101 of the motor 100, a steering sleeve 2 sleeved on the locking sleeve 1, a sleeve sleeved on the steering sleeve 2, and a pulley 3 sleeved on the sleeve;

[0038] The locking sleeve 1 includes an upper shaft sleeve 11 and a lower shaft sleeve 12. The upper shaft sleeve 11 and the lower shaft sleeve 12 are both provided with a plunger 15. The upper shaft sleeve 11 is further provided with a male buckle 17, and the lower shaft sleeve 12 is further provided with a female buckle 16 that cooperates with the male buckle 17. The upper shaft sleeve 11 and the lower shaft sleeve 12 are provided with a U-shaped groove 14 at the position of the male buckle 17 and the female buckle 16. The lower shaft sleeve 12 is further provided with a key groove 13. The upper shaft sleeve 11 and the lower shaft sleeve 12 are in a semi-circular arc shape; there is a gap between the upper shaft sleeve 11 and the lower shaft sleeve 12; a flat key that cooperates with the output shaft 101 is further provided in the key groove 13.

[0039] The outer surface of the steering sleeve 2 is provided with a first annular groove 21, a second annular groove 22 and a groove 24 that are parallel to each other. The groove 24 is symmetrically arranged on the outer surface of the steering shaft. There is a certain distance between the first annular groove 21, the second annular groove 22 and the groove 24. The outer surface of the steering shaft is further provided with two guiding grooves 23 that are parallel to each other and penetrate through the first arc groove, the second annular groove 22 and the groove 24; limiting teeth 25 are provided at the positions of the guiding grooves 23 in the first annular groove 21, the second annular groove 22 and the groove 24. The limiting teeth 25 in the first annular groove 21 and the limiting teeth 25 in the second annular groove 22 are arranged in opposite limiting directions; the limiting teeth 25 are movably connected to the steering sleeve 2. The limiting teeth 25 rotate in a single direction. The protective cover 5 is provided with a through hole at the position of the belt pulley 3; a set screw 26 is provided on one side of the limiting teeth 25 in the groove 24. The set screw 26 is threadedly connected to the steering sleeve 2, and the set screw 26 abuts against the limiting teeth 25.

[0040] The inner wall of the steering sleeve 2 is further provided with a pin hole 27 that cooperates with the plunger 15 and the U-shaped hole groove. A pin is provided between the U-shaped groove 14 and the pin hole 27; the plunger 15 is respectively and independently threadedly connected to the upper shaft sleeve 11 and the lower shaft sleeve 12; the inner wall of the belt pulley 3 is provided with a fixing pin 31 that slidably cooperates with the guiding groove 23.

[0041] Working principle: First, adjust the belt pulley 3 at three positions on the steering sleeve 2 as needed;

[0042] The first position (positive rotation locking position): The belt pulley 3 is slidably engaged with the guiding groove 23 of the steering sleeve 2 through the fixing pin 31 and moves to the position corresponding to the first annular groove 21; the limiting teeth 25 in the first annular groove 21 cooperate with the fixing pin 31 of the belt pulley 3 to limit the belt pulley 3 to rotate in only one direction (positive); when the motor 100 rotates forward, the fixing pin 31 abuts against one side of the limiting teeth 25 and rotates synchronously with the output shaft 101 of the motor 100; when the motor 100 rotates reversely, the limiting teeth 25 are opened when the other side is abutted by the fixing pin 31 to ensure that the belt pulley 3 remains stationary when the motor 100 rotates reversely;

[0043] The second position (reverse rotation locking position): the pulley 3 slides to the position corresponding to the second annular groove 22 through the fixing pin 31; the limiting tooth 25 in the second annular groove 22 cooperates with the fixing pin 31 of the pulley 3, limiting the pulley 3 to rotate only in the other direction (reverse direction); when the motor 100 rotates in the reverse direction, the limiting tooth 25 opens when one side is resisted by the fixing pin 31, ensuring that the pulley 3 remains stationary when the motor 100 rotates in the reverse direction, and the pulley 3 rotates synchronously with the output shaft 101 of the motor 100; when the motor 100 rotates in the forward direction, the fixing pin 31 resists the other side of the limiting tooth 25, and rotates synchronously with the output shaft 101 of the motor 100;

[0044] The third position (free rotation position): the pulley 3 slides to the position corresponding to the groove 24 through the fixing pin 31; the limiting tooth 25 in the groove 24 is adjusted by the top screw 26 so that the limiting tooth 25 is out of contact with the fixing pin 31, and the pulley 3 can rotate freely when the motor 100 rotates forward and reversely;

[0045] Then the motor 100 is started, and the output shaft 101 of the motor 100 is fixedly connected to the locking sleeve 1 through a flat key, driving the locking sleeve 1 to rotate synchronously; the locking sleeve 1 is fixedly connected to the steering sleeve 2 through a pin, driving the steering sleeve 2 to rotate synchronously; the steering sleeve 2 cooperates with the fixing pin 31 of the pulley 3 through the limiting tooth 25, and according to the position adjustment of the pulley 3, the pulley 3 is realized to rotate forward, reverse or freely;

[0046] When the pulley 3 is overloaded, the limit tooth 25 prevents the pulley 3 from reversing or rotating forward, ensuring that the pulley 3 remains stationary, avoiding abnormal reversal or overload operation of the motor 100, and protecting the safety of the motor 100 and the equipment.

[0047] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A pulley keyway locking structure, characterized in that: include: A motor, a fixing plate for fixing the motor, a protective cover mounted on the fixing plate, a locking sleeve sleeved on the output shaft of the motor, a steering sleeve sleeved on the locking sleeve, a sleeve sleeved on the steering sleeve, and a pulley sleeved on the sleeve; It is characterized in that the locking sleeve includes an upper sleeve and a lower sleeve, the upper sleeve and the lower sleeve are both provided with plungers, the upper sleeve is also provided with a sub-buckle, the lower sleeve is also provided with a female buckle that cooperates with the sub-buckle, the upper sleeve and the lower sleeve are provided with U-shaped grooves at the sub-buckle and the female buckle, the lower sleeve is also provided with a keyway, the upper sleeve and the lower sleeve are semicircular arc-shaped; a gap is left between the upper sleeve and the lower sleeve; a flat key that cooperates with the output shaft is also provided in the keyway.

2. A pulley keyway locking structure according to claim 1, characterized in that: The outer surface of the steering sleeve is provided with a first annular groove, a second annular groove and a groove which are parallel to each other. The grooves are symmetrically arranged on the outer surface of the steering shaft. A certain distance is set between the first annular groove, the second annular groove and the groove. The outer surface of the steering shaft is also provided with two guide grooves which are parallel to each other and pass through the first arc groove, the second annular groove and the groove.

3. A pulley keyway locking structure according to claim 2, characterized in that: The first annular groove, the second annular groove and the groove are all provided with limiting teeth at the guide groove, and the limiting teeth in the first annular groove are arranged in opposite limiting directions to the limiting teeth in the second annular groove.

4. A pulley keyway locking structure according to claim 3, characterized in that: The limiting tooth is movably connected to the steering sleeve, the limiting tooth rotates in one direction, and the protective cover is provided with a through hole at the position of the pulley.

5. A pulley keyway locking structure according to claim 2, characterized in that: A top screw is arranged on one side of the limiting tooth in the groove, the top screw is threadedly connected with the steering sleeve, and the top screw abuts against the limiting tooth.

6. A pulley keyway locking structure according to claim 1, characterized in that: The inner wall of the steering sleeve is also provided with a pin hole matched with the plunger and the U-shaped hole groove, and a pin is provided between the U-shaped groove and the pin hole.

7. A pulley keyway locking structure according to claim 1, characterized in that: The plunger is independently connected to the upper sleeve and the lower sleeve by threads respectively; the inner wall of the pulley is provided with a fixing pin which is slidably matched with the guide groove.

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