CN218236051U

CN218236051U - Speed reducer

Info

Publication number: CN218236051U
Application number: CN202221678195.1U
Authority: CN
Inventors: 翟延鹏; M·施迈因克
Original assignee: Bosch Rexroth Beijing Hydraulic Co Ltd
Current assignee: Bosch Rexroth Beijing Hydraulic Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-01-06
Anticipated expiration: 2032-06-30

Abstract

The application provides a speed reducer 1, it has ring gear 2, planetary gear 3, the back shaft 4 and the axle sleeve 5 that are connected with planetary gear's bearing 6, and wherein back shaft and axle sleeve threaded connection, the one end of back shaft are equipped with the axial and cave in and radially accept chamber 41 with axle sleeve internal thread intercommunication, its characterized in that: the speed reducer includes a fixing element 42 disposed in the accommodating cavity and interfering with the internal thread of the shaft sleeve, and the accommodating cavity and/or the fixing element has a locking portion formed by pressing the side wall 411 of the accommodating cavity by an external force to deform and lock the fixing element, so that the support shaft can be stably fixed in the shaft sleeve, and the risk of falling of the support shaft is avoided.

Description

Speed reducer

Technical Field

The application relates to a speed reducer, in particular to a planetary gear transmission speed reducer.

Background

Planetary gear reducer is with its small, transmission efficiency is high, and speed reduction range is wide, a great deal of advantages such as precision height, and widely used in servo motor, step motor, direct current motor etc. transmission system.

In the prior art, a supporting shaft of a planetary gear bearing is usually fixed on a shaft sleeve through threaded connection, but the threaded connection between the supporting shaft and the shaft sleeve can loosen in continuous vibration due to certain vibration of the speed reducer in the working process, so that the danger of bearing falling off can occur in long-time working, and the speed reducer cannot work.

Therefore, there is a need to provide an improved technical solution to overcome the technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a speed reducer, it has ring gear, planetary gear, the back shaft and the axle sleeve that are connected with planetary gear's bearing, and wherein back shaft and axle sleeve threaded connection, the one end of back shaft is equipped with the axially sunk and radially accepts the chamber with axle sleeve internal thread intercommunication, its characterized in that: the speed reducer comprises a fixing element which is arranged in the accommodating cavity and interferes with the internal thread of the shaft sleeve, and the accommodating cavity and/or the fixing element are/is provided with a locking part which is formed by pressing the side wall of the accommodating cavity by external force and is used for locking and fixing the fixing element.

The utility model also provides a speed reducer still is provided with the blind hole on the back shaft, the blind hole is set up accept the chamber periphery and be close to and accept the chamber, the blind hole receives external force to cause to accept the chamber lateral wall and warp and form the solid portion of lock.

The utility model also provides a speed reducer, fixed component have and accept cover and latch component, it is equipped with the latch accepting groove to accept the cover, and the latch component can be acceptd in the latch accepting groove, the maximum external diameter of latch component is greater than the maximum internal diameter of latch accepting groove.

The utility model also provides a speed reducer, the fixed component is the expansion pin.

Because the foundation the utility model discloses a speed reducer is provided with the fixed component of part embedding axle sleeve on the back shaft to can accept the chamber lateral wall formation lock solid portion of lock solid fixed component of acceping of fixed component, thereby can stabilize and fix the back shaft, make it firmly fix in the axle sleeve, can not take place the danger that the back shaft drops, consequently greatly increased the life of speed reducer and saved the cost.

Drawings

The present application will be more fully understood from the detailed description given below in conjunction with the accompanying drawings, in which like reference numerals refer to like elements in the figures. Wherein:

fig. 1 shows a top view of a speed reducer according to an embodiment of the invention;

FIG. 2 is a partial enlarged view of region A in FIG. 1;

FIG. 3 showsbase:Sub>A partial cross-sectional view along A-A of FIG. 2;

fig. 4 is a partial enlarged view of a region a in a top view of a speed reducer according to another embodiment of the present invention;

fig. 5 is a schematic view of the fixing element of fig. 4 according to another embodiment of the present invention;

fig. 6 shows a partial cross-sectional view along B-B of fig. 4.

Detailed Description

Referring to fig. 1 to 3, fig. 1 isbase:Sub>A top view ofbase:Sub>A speed reducer according to an embodiment of the present invention, fig. 2 isbase:Sub>A partially enlarged view ofbase:Sub>A regionbase:Sub>A in fig. 1, and fig. 3 isbase:Sub>A sectional view of fig. 2 alongbase:Sub>A linebase:Sub>A-base:Sub>A. According to the utility model discloses a reduction gear 1 of an embodiment, it has ring gear 2, planetary gear 3, connects planetary gear's bearing 6's back shaft 4 and axle sleeve 5, wherein back shaft 4 and axle sleeve 5 threaded connection, the one end on the back shaft 4 is equipped with the axially sunk and radial and axle sleeve internal thread intercommunication accept chamber 41, and fixed component 42 is arranged in accept in the chamber 41 and with axle sleeve internal thread interference. When the fixing member 42 is installed, it is necessary to partially embed the fixing member 42 into the sleeve 5 by an external force to interfere with the thread in the sleeve, so that the fixing member 42 may break the threaded connection 51 (shown by a dotted line in fig. 3) between the support shaft 4 and the sleeve 5. Since the threaded connection between the support shaft 4 and the shaft sleeve 5 is broken by the fixing element 42, even if the speed reducer vibrates during operation, the threaded connection between the support shaft 4 and the shaft sleeve 5 does not slide, so that the support shaft 4 is stably fixed in the shaft sleeve 5 without falling off. In some embodiments, the fixation elements 42 may be fixation pins.

In order to further fix the fixing element 42 in the accommodating cavity 41, according to an embodiment of the present invention, a blind hole 43 is provided on the supporting shaft 4 at the periphery of the accommodating cavity 41 and near the accommodating cavity 41. After the fixing element 42 is installed in the receiving cavity 41, a punching tool (not shown) is used to punch the blind hole 43 close to the blind hole sidewall 431 of the receiving cavity 41, since the blind hole 43 is disposed close to the receiving cavity 41, the punching external force is transmitted to the receiving cavity sidewall 411 of the receiving cavity 41 through the blind hole sidewall 431, and under the punching of the external force, the receiving cavity sidewall 411 is deformed to form a locking portion for locking the fixing element 42, so that the fixing element 42 is more stably fixed in the receiving cavity, and the supporting shaft 4 is more stably fixed in the shaft sleeve 5.

In some embodiments, the blind holes 43 are symmetrically disposed on the outer circumference of the receiving cavity 41 and close to the supporting shaft of the receiving cavity 41, so as to better lock the fixing member 42. In some examples, the number of blind holes 43, such as 3, 4, 5, 6, 8230, and thus the locking portion of the locking member 42, may be increased to more securely lock the locking member 42. The blind holes 43 may also be evenly distributed on the support shaft at the periphery of the receiving cavity 41.

In some embodiments, the distance d between the blind hole sidewall 431 of the blind hole 43 near the side of the receiving cavity 41 and the side wall of the receiving cavity is 1-2mm, which is more favorable for the transmission of the punching external force.

The shape of the blind hole 43 may be circular, triangular, rectangular or strip-shaped in some embodiments.

In some embodiments, the fixing element 42 is received in the receiving cavity 41 and does not protrude from the end surface of the supporting shaft; or the housing chamber 41 is provided on the support shaft at the gap between the adjacent two planetary gears 3 as viewed in the axial direction.

Referring to fig. 4 to 6, fig. 4 is a partial enlarged view of a region a in a plan view of a speed reducer according to another embodiment of the present invention, fig. 5 is a schematic view of a fixing element according to another embodiment of the present invention in fig. 4, and fig. 6 is a sectional view of fig. 4 taken along B-B. In some embodiments, the fixing element 42 has a receiving sleeve 421 and a latch element 422, the receiving sleeve is provided with a latch receiving groove 423, the latch element 422 is received in the latch receiving groove 423, and the maximum outer diameter of the latch element 422 is larger than the maximum inner diameter of the latch receiving groove. When the latch member 422 is pressed by an external force using an impact tool, since the maximum outer diameter of the latch member 422 is larger than the maximum inner diameter of the latch accommodating groove 423, the latch member 422 presses the accommodating sleeve side wall, the accommodating sleeve side wall is deformed, and the accommodating chamber side wall 411 of the accommodating chamber 41 is deformed to form a locking portion (a region shown by a dotted line in fig. 6).

The latching element 422 in some embodiments is spherical, conical, or other shape.

In some embodiments, the housing sleeve 421 material is case hardened steel in some embodiments.

In some embodiments, the outer surface of the receiving sleeve 421 of the fixing element 42 (i.e. the surface of the fixing element contacting the side wall of the receiving cavity after installation) is provided with a groove structure, so that the fixing force of the locking portion can be increased. In addition to the groove structure, the outer surface of the fixing element 42 may also be provided with other locking force increasing mechanisms such as a protrusion structure.

In some embodiments, the fixing element 42 may be an expansion pin which is impacted with a pressing tool during installation and which may expand the receiving chamber side wall 411 of the receiving chamber 41 and deform the receiving chamber side wall 411 to form the locking portion. The fixing element 42 may be provided with other expansion structures, as long as the receiving cavity side wall 411 of the receiving cavity 41 can be expanded and formed into a locking portion under the impact of the punching tool.

The above detailed description is intended to be illustrative, but not limiting, of the present application, and the scope of the patent protection given to this application is defined by the appended claims.

Claims

1. A speed reducer (1) is provided with a ring gear (2), a planetary gear (3), a support shaft (4) and a shaft sleeve (5), wherein the support shaft is connected with the shaft sleeve through threads, one end of the support shaft is provided with an accommodating cavity (41) which is axially sunken and is communicated with the shaft sleeve through internal threads, and the speed reducer is characterized in that: the speed reducer comprises a fixing element (42) which is arranged in the accommodating cavity and interferes with the internal thread of the shaft sleeve, and the accommodating cavity and/or the fixing element are/is provided with a locking part which is formed by pressing the side wall (411) of the accommodating cavity by external force and is used for locking the fixing element in a deformed mode.

2. The speed reducer according to claim 1, characterized in that: the supporting shaft (4) is further provided with a blind hole (43), the blind hole is formed in the periphery of the containing cavity and close to the containing cavity, and the blind hole deforms to form a locking part due to external force on a side wall (411) of the containing cavity.

3. The reducer of claim 2, wherein: the blind holes are symmetrically distributed or uniformly distributed on the periphery of the containing cavity (41) and close to the supporting shaft of the containing cavity.

4. A reducer according to claim 2 or 3, wherein: the distance d between the blind hole side wall (431) of the blind hole (43) close to one side of the containing cavity and the side wall (411) of the containing cavity is 1-2mm.

5. A reducer according to claim 2 or 3, wherein: the fixing element is accommodated in the accommodating cavity and does not protrude out of the end face of the supporting shaft; or the containing cavity (41) is arranged on the supporting shaft at the gap between two adjacent planetary gears (3) when viewed from the axial direction.

6. The reducer of claim 5, wherein: the shape of the blind hole can be circular, triangular, rectangular or strip-shaped.

7. The reducer of claim 1, wherein: the fixing element (42) has a receiving sleeve (421) and a latching element (422), the receiving sleeve is provided with a latching receiving groove (423), the latching element can be received in the latching receiving groove, and the maximum outer diameter of the latching element is larger than the maximum inner diameter of the latching receiving groove.

8. The speed reducer according to claim 7, wherein: the latching element (422) is spherical or conical, and the material of the receiving sleeve (421) is case hardened steel.

9. The reducer of claim 1, wherein: the securing element (42) is an expansion pin.

10. A reducer according to any one of claims 1-9, wherein: the outer surface of the fixing element is provided with a groove or a protruding structure.