Noise reduction type speed reducer

Abstract

The utility model discloses a noise reduction type speed reducer which comprises an outer shell, a gear frame and a transmission assembly, the gear frame is rotationally connected in the outer shell, the transmission assembly is installed in the outer shell and is in transmission connection with the gear frame, and a motor can drive the gear frame to rotate through the transmission assembly. The speed reducer further comprises a connecting shaft and an output shaft, the connecting shaft is arranged in the shell and coaxially and fixedly connected to the side, away from the transmission assembly, of the gear carrier, a transmission groove is formed in the end of the connecting shaft, the output shaft comprises a circular shaft part and a square shaft part matched with the transmission groove, the square shaft part is coaxially and fixedly connected with the circular shaft part, and the square shaft part is inserted into the transmission groove. A gap exists between the square shaft part and the groove bottom of the transmission groove, the square shaft part can slide in the axial direction of the connecting shaft, and the circular shaft part penetrates out of the shell and is rotationally connected with the shell. The utility model provides a noise reduction type speed reducer which can reduce axial vibration borne by a gear frame and a transmission assembly, and therefore abrasion and noise are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a noise reduction reducer. Background Art

[0002] The existing planetary reducer can refer to the patent application number CN2017208321442, which includes a housing, an input shaft, a sun gear, a planetary gear, a gear rack, and an output shaft. The input shaft is rotatably connected to one side of the housing, the sun gear is coaxially fixedly connected to the input shaft, the planetary gears are meshed with the sun gear, the planetary gears are mounted on the gear rack, the gear rack is rotatably connected to the housing, and the output shaft is fixedly connected to the gear rack and extends outside the housing.

[0003] The output shaft of the existing planetary reducer is fixedly connected to the gear frame. When in use, the external equipment is connected to the reducer through the output shaft. If axial vibration is generated during the operation of the external equipment, the axial vibration is transmitted to the planetary gear through the output shaft and the gear frame. The vibration of the planetary gear increases the wear and noise of the reducer. Utility Model Content

[0004] In order to solve the shortcomings of existing reducers such as wear and high noise, the utility model provides a noise-reducing reducer, which can reduce the axial vibration of the gear rack and the transmission assembly, thereby reducing wear and noise.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A noise reduction reducer comprises a housing, a gear rack and a transmission assembly, wherein the gear rack is rotatably connected in the housing, the transmission assembly is installed in the housing and is transmission-connected to the gear rack, and a motor can drive the gear rack to rotate through the transmission assembly;

[0007] The reducer also includes a connecting shaft and an output shaft. The connecting shaft is arranged in the outer shell and is coaxially fixedly connected to the side of the gear frame away from the transmission assembly. A transmission groove is arranged at the end of the connecting shaft. The output shaft includes a round shaft portion and a square shaft portion adapted to the transmission groove. The square shaft portion is coaxially fixedly connected to the round shaft portion. The square shaft portion is inserted into the transmission groove. There is a gap between the square shaft portion and the bottom of the transmission groove. The square shaft portion can slide along the axial direction of the connecting shaft, and the round shaft portion passes through the outer shell and is rotatably connected to the outer shell.

[0008] Through the above arrangement, when the output shaft drives an external device, when the output shaft vibrates axially due to the vibration of the external device, the output shaft and the transmission groove move axially relative to each other to reduce the axial vibration of the gear rack and the planetary gears, thereby reducing the axial vibration of the gear rack and the transmission assembly, and further reducing the wear and noise of the reducer.

[0009] Furthermore, the side of the connecting shaft is raised to form a groove on the side of the transmission groove and a protrusion on the side of the connecting shaft; the output shaft also includes a ball and a spring, and a first mounting groove is provided on the side of the square shaft portion, the ball is installed in the first mounting groove and can move along the first mounting groove, the ball is at least partially arranged in the groove, and the groove opening of the first mounting groove is provided with a constriction to prevent the ball from leaving the first mounting groove outward, one end of the spring is connected to the bottom of the first mounting groove, and the other end of the spring is connected to the ball.

[0010] Through the above arrangement, firstly, the outer surface area of ​​the connecting shaft is increased, thereby facilitating heat dissipation of the connecting shaft; secondly, the ball bearings can prevent the square shaft portion from being easily pulled out of the transmission groove to a certain extent.

[0011] Furthermore, a second mounting groove is provided at one end of the square shaft portion away from the round shaft portion, and the second mounting groove penetrates into the first mounting groove to form a mounting opening for convenient installation of the spring and the ball. The output shaft also includes a cover plate and bolts, and the cover plate is locked in the second mounting groove by bolts to seal the mounting opening.

[0012] The above arrangement makes it easy to install the spring and the ball, and to replace and repair the spring and the ball.

[0013] Furthermore, the reducer also includes a shaft sleeve, which passes through one side of the shell and is locked on the shell, and the round shaft portion passes through the shaft sleeve and is rotatably connected to the shaft sleeve.

[0014] Through the above arrangement, the rotation stability of the output shaft is improved.

[0015] Furthermore, the transmission assembly includes: an input shaft connectable to the motor, a sun gear, planetary gears and a gear ring; the input shaft is rotatably connected to the side of the housing away from the output shaft; the sun gear is arranged in the housing and is coaxially fixedly connected to the input shaft; the planetary gears are rotatably connected to the gear rack and mesh with the side of the sun gear; the gear ring is fixedly connected to the inner side of the housing along the circumferential direction, and the side of the planetary gear away from the sun gear meshes with the gear ring.

[0016] Through the above arrangement, the motor drives the gear rack via the output shaft, the sun gear and the planetary gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a reducer according to an embodiment.

[0018] Figure 2 A cross-sectional view of an embodiment.

[0019] Figure 3 for Figure 2 Enlarged view of point A. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0021] See also Figures 1 to 3 A noise reduction reducer includes a housing 3, a gear rack 4, and a transmission assembly 5. The gear rack 4 is rotatably connected to the housing 3. The transmission assembly 5 is installed in the housing 3 and is transmission-connected to the gear rack 4. The motor can drive the gear rack 4 to rotate through the transmission assembly.

[0022] The reducer also includes a connecting shaft 6 and an output shaft 7. The connecting shaft 6 is arranged in the outer shell 3 and is coaxially fixedly connected to the side of the gear frame 4 away from the transmission assembly. A transmission groove 61 is arranged at the end of the connecting shaft 6. The output shaft 7 includes a round shaft portion 71 and a square shaft portion 72 adapted to the transmission groove 61. The square shaft portion 72 is coaxially fixedly connected to the round shaft portion 71, and the square shaft portion 72 is inserted into the transmission groove 61. There is a gap between the square shaft portion 72 and the bottom of the transmission groove 61. The square shaft portion 72 can slide along the axial direction of the connecting shaft 6, and the round shaft portion 71 passes through the outer shell 3 and is rotatably connected to the outer shell 3.

[0023] Through the above arrangement, when the output shaft 7 drives an external device, when the output shaft 7 vibrates axially due to the vibration of the external device, the output shaft 7 and the transmission groove 61 move axially relative to each other to reduce the axial vibration of the gear frame 4 and the planetary gears 53, thereby reducing the axial vibration of the gear frame 4 and the transmission assembly, and further reducing the wear and noise of the reducer.

[0024] In the present application, the transmission assembly 5 can refer to the existing planetary reducer, which mainly plays a transmission role. The external motor drives the gear frame 4 through the transmission assembly 5, and the gear frame 4 drives the external device through the connecting shaft 6, the transmission groove 61, the square shaft portion 72 and the round shaft portion 71; the cross-section of the transmission groove 61 is square, which is adapted to the square shaft portion 72, that is, after the square shaft portion 72 is inserted into the transmission groove 61, the square shaft portion 72 is in contact with the transmission groove 61, and the square shaft portion 72 and the connecting shaft 6 basically cannot rotate relative to each other. The square shaft portion 72 can only slide back and forth in the transmission groove 61, and the round shaft portion 71 passes through the outer shell 3 and can slide back and forth synchronously with the square shaft portion 72; when the vibration of the external device causes the output shaft 7 to vibrate axially, the square shaft portion 72 and the transmission groove 61 slide relative to each other, thereby reducing the axial vibration of the gear frame 4 and the transmission assembly, and then reducing the wear and noise of the reducer.

[0025] As an implementation method, the side of the connecting shaft 6 is raised to form a groove 62 on the side of the transmission groove 61, and a protrusion 63 is formed on the side of the connecting shaft 6; the output shaft 7 also includes a ball 8 and a spring 9, and a first mounting groove 73 is provided on the side of the square shaft portion 72. The ball 8 is installed in the first mounting groove 73 and can move along the first mounting groove 73. The ball 8 is at least partially arranged in the groove 62, and the groove opening of the first mounting groove 73 is provided with a constriction to prevent the ball from leaving the first mounting groove 73 outward. One end of the spring 9 is connected to the bottom of the first mounting groove 73, and the other end of the spring 9 is connected to the ball 8.

[0026] Through the above arrangement, firstly, the outer surface area of ​​the connecting shaft 6 is increased, thereby facilitating heat dissipation of the connecting shaft 6; secondly, the ball 8 can prevent the square shaft portion 72 from being easily pulled out of the transmission groove 61 to a certain extent.

[0027] In the present application, when the output shaft 7 vibrates axially, the relative friction between the square shaft portion 72 of the output shaft 7 and the transmission groove 61 generates heat, and the protrusion 63 increases the surface area of ​​the connecting shaft 6, thereby improving the heat dissipation of the connecting shaft 6 to a certain extent; when the output shaft 7 vibrates axially, the ball 8 vibrates synchronously with the output shaft 7 and does not contact the end of the groove 62; when the output shaft 7 of the reducer is not connected to an external device, the output shaft 7 can move axially. Specifically, the output shaft 7 moves outward until the ball 8 contacts the end of the groove 62. Under the obstruction of the ball 8, the output shaft 7 cannot continue to move outward, preventing the output shaft 7 from being pulled out. When the output shaft 7 is pulled outward by hand, the groove 62 squeezes the outer side of the ball 8, and the ball 8 moves into the first installation groove 73, the spring 9 is compressed, and finally the output shaft 7 is pulled out, which is convenient for the maintenance and replacement of the output shaft 7; when installing the output shaft 7, the square shaft portion 72 is inserted into the transmission groove 61 with force. After the spring 9 is reset, the ball 8 automatically embeds into the groove 62.

[0028] As an implementation method, a second mounting groove 74 is provided at one end of the square shaft portion 72 away from the round shaft portion 71. The second mounting groove 74 penetrates into the first mounting groove 73 to form a mounting opening for convenient installation of the spring 9 and the ball 8. The output shaft 7 also includes a cover plate 10 and a bolt 11. The cover plate 10 is locked in the second mounting groove 74 by the bolt 11 to seal the mounting opening.

[0029] The above arrangement makes it easy to install the spring 9 and the ball 8, and to replace and repair the spring 9 and the ball 8.

[0030] As an implementation method, the reducer further includes a shaft sleeve 12 , the shaft sleeve 12 passes through one side of the housing 3 and is locked on the housing 3 , and the round shaft portion 71 passes through the shaft sleeve 12 and is rotatably connected to the shaft sleeve 12 .

[0031] Through the above arrangement, the rotation stability of the output shaft 7 is improved.

[0032] In the present application, the sleeve 12 is made of metal, and the inner wall of the sleeve 12 fits against the circular shaft portion 71 to prevent the circular shaft portion 71 from shaking. After lubricating oil is provided between the sleeve 12 and the circular shaft portion 71, the friction between the sleeve 12 and the circular shaft portion 71 can be reduced.

[0033] As an implementation method, the transmission assembly 5 includes: an input shaft 51 that can be connected to the motor, a sun gear 52, a planetary gear 53 and a ring gear 54; the input shaft 51 is rotatably connected to the side of the housing 3 away from the output shaft 7; the sun gear 52 is arranged in the housing 3 and is coaxially fixedly connected to the input shaft 51; the planetary gear 53 is rotatably connected to the gear frame 4 and meshes with the side of the sun gear 52; the ring gear 54 is fixedly connected to the inner side of the housing 3 along the circumferential direction, and the side of the planetary gear 53 away from the sun gear 52 is meshed with the ring gear 54.

[0034] Through the above arrangement, the motor drives the gear carrier 4 through the output shaft 7 , the sun gear 52 , and the planetary gears 53 .

[0035] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A noise reduction reducer, characterized in that: It includes a housing, a gear rack, and a transmission assembly, wherein the gear rack is rotatably connected to the housing, the transmission assembly is installed in the housing and is transmission-connected to the gear rack, and the motor can drive the gear rack to rotate through the transmission assembly; The reducer also includes a connecting shaft and an output shaft. The connecting shaft is arranged in the outer shell and is coaxially fixedly connected to the side of the gear frame away from the transmission assembly. A transmission groove is arranged at the end of the connecting shaft. The output shaft includes a round shaft portion and a square shaft portion adapted to the transmission groove. The square shaft portion is coaxially fixedly connected to the round shaft portion, and the square shaft portion is inserted into the transmission groove. There is a gap between the square shaft portion and the bottom of the transmission groove. The square shaft portion can slide along the axial direction of the connecting shaft, and the round shaft portion passes through the outer shell and is rotatably connected to the outer shell.

2. A noise reduction reducer according to claim 1, characterized in that: The side surface of the connecting shaft is raised to form a groove on the side surface of the transmission groove and a protrusion on the side surface of the connecting shaft; The output shaft also includes a ball and a spring. A first mounting groove is provided on the side of the square shaft portion. The ball is installed in the first mounting groove and can move along the first mounting groove. The ball is at least partially arranged in the groove. The groove opening of the first mounting groove is provided with a constriction to prevent the ball from leaving the first mounting groove outward. One end of the spring is connected to the bottom of the first mounting groove, and the other end of the spring is connected to the ball.

3. A noise reduction reducer according to claim 2, characterized in that: A second mounting groove is provided at one end of the square shaft portion away from the round shaft portion, and the second mounting groove penetrates into the first mounting groove to form a mounting opening for convenient installation of the spring and the ball. The output shaft also includes a cover plate and bolts, and the cover plate is locked in the second mounting groove by the bolts to seal the mounting opening.

4. A noise reduction reducer according to claim 1, characterized in that: The reducer further comprises a shaft sleeve, which passes through one side of the housing and is locked on the housing, and the round shaft portion passes through the shaft sleeve and is rotatably connected to the shaft sleeve.

5. The noise reduction reducer according to claim 1, characterized in that: The transmission assembly comprises: An input shaft connectable to the motor, the input shaft being rotatably connected to a side of the housing away from the output shaft; A sun gear, the sun gear is arranged in the housing and is coaxially fixedly connected to the input shaft; A planetary gear, the planetary gear is rotatably connected to the gear carrier and meshes with the side surface of the sun gear; A gear ring is fixedly connected to the inner side of the housing along the circumferential direction, and a side of the planetary gear away from the sun gear is meshed with the gear ring.

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