Shake-proof connecting structure for shaft connection and electric grinding tool comprising same

Abstract

The utility model discloses a shakeproof connecting structure for shaft connection and an electric polishing tool comprising the shakeproof connecting structure, the shakeproof connecting structure for shaft connection comprises a motor body, a connecting main shaft and a transmission gear ring, one end of the motor body is provided with a motor output shaft; one end, facing the motor body, of the connecting main shaft sleeves the motor output shaft; the transmission gear ring is located between the motor output shaft and the connecting main shaft and comprises a ring body arranged on the motor output shaft in an interference sleeving mode, and the outer wall of the ring body is in clearance fit with the inner wall of the connecting main shaft through a transmission part. According to the utility model, not only is the stability of shaft connection ensured, but also the shaft vibration can be buffered and released.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field especially, it relates to a kind of anti-vibration connecting structure for shaft connection and the electric grinding tool comprising it. BACKGROUND

[0002] In the preparation process of product, the surface of product is often treated by polishing process, and the polishing process is to mechanically grind the surface of product by abrasive grain fixed polishing head such as grinding wheel and sandpaper, to achieve the purposes of removing product surface burrs, surface rust treatment, surface polishing and the like. When the polishing equipment contacts the product, various vibrations will inevitably occur, which will easily cause the collision of internal components of the motor when the vibration is transmitted to the motor shaft, thereby affecting the service life of the motor. SUMMARY

[0003] To overcome the above-mentioned shortcomings, the utility model aims at providing an anti-vibration connecting structure for shaft connection and an electric grinding tool comprising the same, which can ensure the stability of shaft connection and buffer and release the shaft vibration through the gap fit between the shafts.

[0004] To achieve the above-mentioned purposes, one of the technical solutions adopted by the utility model is as follows: an anti-vibration connecting structure for shaft connection, comprising

[0005] a motor body, one end of the motor body is provided with a motor output shaft;

[0006] a connecting main shaft, one end of the connecting main shaft is sleeved on the motor output shaft towards the motor body;

[0007] a transmission gear ring, the transmission gear ring is located between the motor output shaft and the connecting main shaft, and comprises a ring body which is interference-fitted on the motor output shaft, and the ring body outer wall and the inner wall of the connecting main shaft are gap-fitted through a transmission part.

[0008] When the motor body is started, the motor output shaft can drive the transmission gear ring to rotate synchronously, and then the transmission part synchronously transmits the rotary motion of the transmission gear ring to the connecting main shaft, so as to realize the rotation of the connecting main shaft, and further realize the rotation of the polishing head connected with the connecting main shaft.

[0009] The anti-vibration connecting structure for shaft connection has the following advantages:

[0010] The rotation of the motor output shaft is transmitted to the external device (such as a polishing head) connected to the connecting main shaft, thereby ensuring the normal operation of the external device; in the transmission gear ring, the ring body is connected with the motor output shaft in interference, which ensures the synchronous rotation of the ring body and the motor output shaft; then the clearance fit between the ring body and the connecting main shaft is realized through the transmission part, which not only ensures the synchronous rotation of the connecting main shaft, but also leaves a transmission gap between the ring body and the connecting main shaft, so as to avoid the transmission of the vibration of the external device to the motor output shaft through the ring body, thereby achieving the purpose of protecting the motor body. That is, through the segmented shaft connection between the connecting main shaft and the motor output shaft, and through the cooperation of the transmission gear ring and the transmission part, a certain gap can be reserved in the process of shaft transmission, so as to achieve the purpose of buffering and releasing external vibration.

[0011] Further, the transmission part includes a plurality of transmission teeth and a plurality of tooth grooves corresponding to the plurality of transmission teeth; the plurality of transmission teeth are arranged in a circumferential array on the outer wall of the ring body, and the plurality of tooth grooves are arranged in a circumferential array on the inner wall of the connecting main shaft; the transmission teeth are located in the corresponding tooth grooves and have a gap with the tooth grooves.

[0012] Further, along the radial direction of the ring body, a first gap is left between the transmission teeth and the groove bottom of the tooth groove; along the circumferential direction of the ring body, a second gap is left between the transmission teeth and the groove wall of the tooth groove. Through the setting of the first gap and the second gap, the vibration can be buffered and released in the radial and circumferential directions of the ring body.

[0013] Further, the first gap is between 0.15 and 0.3 mm, and the second gap is between 0.1 and 0.15 mm.

[0014] Further, along the circumferential direction of the ring body, the size of the transmission teeth gradually decreases from the direction close to the ring body to the direction away from the ring body.

[0015] Further, the cross section of the motor output shaft is in the shape of an oval track, and the inner ring surface of the ring body is adapted to the oval track. To ensure the synchronous transmission of the motor output shaft and the ring body.

[0016] Further, the connecting main shaft is provided with a first ring groove and a second ring groove which are in communication with each other, the radial size of the first ring groove is smaller than the radial size of the second ring groove, and the radial size of the first ring groove is adapted to the outer diameter of the ring body, and the radial size of the second ring groove is adapted to the radial size of the circumference formed by the groove bottoms of the plurality of tooth grooves.

[0017] Further, the junction of the first ring groove and the second ring groove forms a stop step for limiting the position of the transmission teeth, and a gap is left between the stop step and the transmission teeth when the transmission teeth are completely located in the tooth groove, so that the ring body can be buffered and released in the axial direction.

[0018] Further, the transmission part comprises a plurality of transmission teeth arranged around the outer wall of the ring body, and the plurality of transmission teeth jointly form a regular polygon structure which is inscribed in the inner wall of the connecting main shaft.

[0019] The second technical scheme of the utility model is: an electric polishing tool, comprising the shock-absorbing connecting structure for shaft connection, which can effectively inhibit the influence of external vibration on the motor while ensuring stable output of the motor, and can ensure the service life of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a perspective view of the shock-absorbing connecting structure for shaft connection in the first embodiment of the utility model;

[0021] Figure 2 Fig. 2 is a sectional view of the shock-absorbing connecting structure for shaft connection in the first embodiment of the utility model;

[0022] Figure 3 Fig. 3 is a structural schematic view of the assembled connecting main shaft and transmission tooth ring in the first embodiment of the utility model;

[0023] Figure 4 Fig. 4 is a sectional view of the assembled connecting main shaft and transmission tooth ring in the first embodiment of the utility model;

[0024] Figure 5 Fig. 5 is a structural schematic view of the transmission tooth ring in the second embodiment of the utility model;

[0025] Figure 6 Fig. 6 is a structural schematic view of the assembled connecting main shaft and transmission tooth ring in the second embodiment of the utility model.

[0026] Fig. 1 is a perspective view of the shock-absorbing connecting structure for shaft connection in the first embodiment of the utility model;

[0027] 1-motor body; 11-motor output shaft; 2-connecting main shaft; 21-first ring groove; 22-second ring groove; 3-transmission tooth ring; 31-ring body; 41, 5-transmission teeth; 42-tooth groove. DETAILED DESCRIPTION

[0028] The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.

[0029] Embodiment one

[0030] Referring to the accompanying Figures 1-2 The utility model discloses a kind of shock-absorbing connection structures for shaft connection, including motor body 1, connecting main shaft 2, transmission gear ring 3, one end of motor body 1 is equipped with motor output shaft 11, connecting main shaft 2 towards the end of motor body 1 is sleeved on motor output shaft 11.Transmission gear ring 3 is located between motor output shaft 11 and connecting main shaft 2, and it includes the ring body 31 of interference fitting on motor output shaft 11, and the inner wall between the ring body 31 outer wall and connecting main shaft 2 is matched by transmission portion with clearance.

[0031] When motor body 1 starts, motor output shaft 11 can drive transmission gear ring 3 synchronous rotation, and then the rotation movement of transmission gear ring 3 is synchronously transmitted to connecting main shaft 2 by transmission portion, to realize the rotation of connecting main shaft 2, and then realize the rotation of polishing head connected with connecting main shaft 2.

[0032] In prior art, motor output shaft 11 is usually directly connected to external device (such as polishing head etc.), when external device vibrates, vibration will be directly transmitted to motor output shaft 11, and then affect normal use of motor body 1;And in the present application, through the cooperation of connecting main shaft 2, transmission gear ring 3 and transmission portion, not only the rotation movement of motor output shaft 11 is transmitted to external device, but also the vibration transmitted to connecting main shaft 2 can be buffered and released by the clearance fit between connecting main shaft 2 and transmission gear ring 3, to avoid vibration transmitted to motor output shaft 11 through transmission gear ring 3.

[0033] In some embodiments, referring to the accompanying Figures 3-4 Transmission portion includes a plurality of transmission teeth 41 and a plurality of tooth grooves 42 corresponding to the plurality of transmission teeth 41;A plurality of transmission teeth 41 are arranged in circumferential array on the outer wall of ring body 31, and a plurality of tooth grooves 42 are arranged in circumferential array on the inner wall of connecting main shaft 2;Transmission tooth 41 is located in corresponding tooth groove 42, and has clearance with tooth groove 42. Transmission of rotation is ensured by the cooperation of transmission tooth 41 and tooth groove 42. Further, transmission tooth 41 is integrally arranged on ring body 31, and tooth groove 42 is integrally arranged on connecting main shaft 2, to ensure the stability of connection.

[0034] In some embodiments, referring to the accompanying Figure 3As shown, along the radial direction of the ring body 31, a first gap is left between the transmission tooth 41 and the groove bottom of the tooth groove 42; along the circumferential direction of the ring body 31, a second gap is left between the transmission tooth 41 and the groove wall of the tooth groove 42. It is to be noted that along the circumferential direction of the ring body 31, the two sides of the transmission tooth 41 and the two groove walls of the tooth groove 42 are respectively provided with the second gap. The first gap and the second gap are configured to buffer and release the vibration in the radial direction and the circumferential direction of the ring body 31. Further, the first gap is between 0.15mm and 0.3mm, and the second gap is between 0.1mm and 0.15mm. Exemplarily, the first gap is 0.2mm, and the second gap is 0.1mm.

[0035] In some embodiments, along the circumferential direction of the ring body 31, the size of the transmission tooth 41 gradually decreases from the direction close to the ring body 31 to the direction away from the ring body 31.

[0036] In order to ensure the synchronization of the movement of the motor output shaft 11 and the ring body 31, in some embodiments, the cross section of the motor output shaft 11 is in the shape of an oval track, and the inner ring surface of the ring body 31 is adapted to the oval track. This is to prevent the ring body 31 from slipping during rotation.

[0037] In some embodiments, referring to the accompanying drawings, Figure 4 As shown, the connecting main shaft 2 is provided with a first ring groove 21 and a second ring groove 22 which are in communication with each other. The radial size of the first ring groove 21 is smaller than the radial size of the second ring groove 22, and the radial size of the first ring groove 21 is adapted to the outer diameter of the ring body 31. The radial size of the second ring groove 22 is adapted to the radial size of the circumference formed by the groove bottoms of the plurality of tooth grooves 42.

[0038] The junction of the first ring groove 21 and the second ring groove 22 forms a stop step for limiting the position of the transmission tooth 41. When the transmission tooth 41 is completely located in the tooth groove 42, a gap is left between the stop step and the transmission tooth 41. This enables the ring body 31 to buffer and release the vibration in the axial direction.

[0039] On this basis, the embodiment further provides an electric polishing tool, which comprises the above-mentioned anti-vibration connecting structure for shaft connection, and a polishing head is connected to the end of the connecting main shaft 2 away from the motor output shaft 11.

[0040] Embodiment Two

[0041] The difference between the present embodiment and Embodiment One is that the transmission part structure is different.

[0042] Specifically, in the present embodiment, referring to the accompanying drawings, Figures 5-6As shown, the transmission part comprises a plurality of transmission teeth 5 arranged around the outer wall of the ring body 31, and the plurality of transmission teeth 5 jointly form a regular polygon structure inscribed in the inner wall of the connecting main shaft 2 towards one side of the connecting main shaft 2. It can be understood that the plurality of transmission teeth 5 and the inner wall of the connecting main shaft 2 can form a regular polygon structure inscribed in a circle, at this time, the two ends of the transmission teeth 5 abut on the inner wall of the connecting main shaft 2 to ensure the synchronous transmission of the transmission teeth 5 to the connecting main shaft 2, and the side away from the ring body 31 of the transmission teeth 5 is spaced from the connecting main shaft 2 to realize the clearance fit of the transmission teeth 5 and the connecting main shaft 2. Exemplarily, the plurality of transmission teeth 5 jointly form a regular hexagon structure.

[0043] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A vibration-damping connection structure for shaft connections, characterized in that: The motor body is provided with a motor output shaft at one end thereof; The connecting main shaft is sleeved on the motor output shaft at one end of the motor body; The transmission gear ring is located between the motor output shaft and the connecting main shaft, and comprises a ring body that is interference-fitted on the motor output shaft, and a transmission part that is gap-fitted between the outer wall of the ring body and the inner wall of the connecting main shaft. The transmission part comprises a plurality of transmission gears and a plurality of tooth grooves corresponding to the transmission gears; the transmission gears are arranged in a circumferential array on the outer wall of the ring body, and the tooth grooves are arranged in a circumferential array on the inner wall of the connecting main shaft; the transmission gears are located in the corresponding tooth grooves and have a gap with the tooth grooves.

2. The anti-vibration connecting structure for a shaft connection according to claim 1, characterized by: Along the radial direction of the ring body, a first gap is left between the transmission gears and the groove bottom of the tooth grooves; along the circumferential direction of the ring body, a second gap is left between the transmission gears and the groove wall of the tooth grooves.

3. The anti-vibration connecting structure for a shaft connection according to claim 2, characterized by: The first gap is between 0.15-0.3 mm, and the second gap is between 0.1-0.15 mm.

4. The anti-vibration connecting structure for a shaft connection according to claim 3, characterized by: Along the circumferential direction of the ring body, the size of the transmission gears gradually decreases from the direction close to the ring body to the direction away from the ring body.

5. The anti-vibration connecting structure for a shaft connection according to claim 2, characterized by: The cross section of the motor output shaft is in the shape of an oval track structure, and the inner annular surface of the ring body is adapted to the oval track structure.

6. The anti-vibration connecting structure for a shaft connection according to claim 1, characterized by: The connecting main shaft is provided with a first ring groove and a second ring groove that are in communication with each other, the radial dimension of the first ring groove is smaller than the radial dimension of the second ring groove, and the radial dimension of the first ring groove is adapted to the outer diameter of the ring body, and the radial dimension of the second ring groove is adapted to the radial dimension of the circumference formed by the groove bottoms of the plurality of tooth grooves.

7. The anti-vibration connecting structure for a shaft connection according to claim 2, characterized by: The intersection of the first ring groove and the second ring groove forms a stop step for limiting the position of the transmission gears; when the transmission gears are completely located in the tooth grooves, a gap is left between the stop step and the transmission gears.

8. The anti-vibration connecting structure for a shaft connection according to claim 7, characterized by: The transmission part comprises a plurality of transmission gears arranged around the outer wall of the ring body, and the plurality of transmission gears collectively form a regular polygon structure that is inscribed in the inner wall of the connecting main shaft on the side of the connecting main shaft.

9. The anti-vibration connecting structure for a shaft connection according to claim 1, characterized by: The anti-vibration connecting structure for shaft connection comprises the anti-vibration connecting structure for shaft connection according to any one of claims 1-9.

10. An electric sander characterized by comprising: ​

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