CN220286366U

CN220286366U - Improved speed reducer

Info

Publication number: CN220286366U
Application number: CN202321578249.1U
Authority: CN
Inventors: 刘大猷; 谢桂平; 夏建敏; 夏挺; 张瑞平; 杨科磊
Original assignee: Zhejiang Xiaxia Precision Manufacturing Co ltd
Current assignee: Zhejiang Xiaxia Precision Manufacturing Co ltd
Priority date: 2023-06-20
Filing date: 2023-06-20
Publication date: 2024-01-02
Anticipated expiration: 2033-06-20

Abstract

The utility model relates to an improved speed reducer, which comprises a deflection angle shaft; a tooth groove wheel sleeved on the periphery of the deflection shaft, and a tooth groove extending along the axial direction of the tooth groove wheel is formed in the inner peripheral wall of the tooth groove wheel; the wave wheel is sleeved between the deflection shaft and the tooth socket wheel, and the lower surface of the wave wheel is provided with an outer bevel gear; the plane gear is sleeved on the periphery of the deflection shaft and is provided with a gear ring meshed with the outer bevel gear; the first end of the rolling pin can be rotationally restrained on the peripheral wall of the fluctuation wheel, and the second end of the rolling pin is positioned in the tooth slot; and the power input end of the output piece is linked with the face gear or the fluctuation wheel, so that the output piece rotates around the rotation axis of the eccentric shaft, and the second end of the needle roller is positioned above the bevel gear outside the fluctuation wheel. The roller pin of the speed reducer moves upwards, so that the height of the whole speed reducer is thinned, and a small space is occupied in the height direction.

Description

Improved speed reducer

Technical Field

The utility model belongs to the technical field of speed reducers, and particularly relates to an improved speed reducer.

Background

The present reduction system comprises a motor and a reducer, wherein the motor drives an input part of the reducer via an input shaft, the reducer reduces the input from the motor and transmits the reduced motion to an output member, which is connected to the device to be driven.

The existing speed reducer is disclosed in Chinese patent application of the applicant's prior application, such as the speed reducer of the Chinese patent application No. CN202211549596.1 (application publication No. CN 115962271A), and comprises a box body, an angular shaft, a fluctuation wheel and a mounting piece, wherein the inner peripheral wall of the box body is provided with a tooth slot extending along the length direction of the angular shaft; the fluctuation wheel is annular, is positioned in the accommodating cavity, is sleeved on the periphery of the deflection shaft, and is arranged to fluctuate back and forth only along the length direction of the deflection shaft, the fluctuation wheel is a middle area of a sphere passing through the center of the sphere, and the rotation axis of the rolling needle passes through the center of the sphere and is perpendicular to the axis of the fluctuation wheel; the mounting piece is arranged on the eccentric angle shaft, one of the mounting piece and the box body is used as a fixing piece, the other mounting piece is used as an output piece, and the power input end of the output piece is in driving connection with the fluctuation wheel so as to rotate around the rotation axis of the eccentric angle shaft under the fluctuation driving of the fluctuation wheel; the first end of the rolling needle can be rotationally restrained on the peripheral wall of the fluctuation wheel, and the second end of the rolling needle is positioned in the tooth groove and is contacted with the corresponding position of the inner side wall of the tooth groove in the fluctuation process of the fluctuation wheel. In the process that the roller pin follows the fluctuation of the fluctuation wheel, the roller pin reciprocates along the extending direction of the tooth groove, and the roller pin contacts with the corresponding position of the inner side wall of the tooth groove, so that the cooperation of the roller pin and the tooth groove limits the rotation of the fluctuation wheel, and the fluctuation wheel swings back and forth only along the length direction of the deflection shaft.

The above patent suffers from the following drawbacks:

the roller pin is positioned below the conical gear, the height of the whole speed reduction device is higher, and a larger space is occupied in the height; the wave wheel adopts a sphere middle area passing through the sphere center of the sphere, so that the wave wheel is complex to manufacture and high in cost.

Therefore, there is a need for further improvements to existing speed reducers.

Disclosure of Invention

The present utility model aims to solve the above-mentioned problems of the prior art, and provides an improved speed reduction device, which achieves the purpose of thinning the whole body by reducing the height.

The technical scheme adopted for solving the technical problems is as follows: an improved speed reduction device comprising:

a yaw shaft vertically arranged and arranged to be rotatable about its own axis of rotation;

the tooth groove wheel is in a ring wall shape and sleeved on the periphery of the deflection shaft, and a tooth groove extending along the axial direction of the tooth groove wheel is formed in the inner peripheral wall of the tooth groove wheel;

the fluctuation wheel is annular and sleeved between the deflection shaft and the tooth socket wheel, and the lower surface of the fluctuation wheel is provided with an outer bevel gear;

the face gear is sleeved on the periphery of the offset angle shaft and is provided with a gear ring which is positioned below the outer bevel gear and meshed with the outer bevel gear, so that the wave wheel is driven to wave back and forth along the length direction of the offset angle shaft;

the first end of the rolling pin is rotatably restrained on the peripheral wall of the fluctuation wheel, and the second end of the rolling pin is positioned in the tooth groove;

an output member, the power input end of which is linked with the face gear or the wave wheel, so that the output member rotates around the rotation axis of the yaw shaft;

the method is characterized in that: the second end of the needle roller is positioned above the bevel gear outside the wave wheel.

In order to further thin the reduction gear, the tooth slot is located above the ring gear of the face gear.

The output member may be a housing or a flange fixed opposite to the face gear, but preferably, the output member is a housing having a cavity therein, the spline wheel is fixed to an inner peripheral wall of the housing, and the face gear is a fixed gear.

In order to further thin the entire reduction gear, the inner peripheral wall of the wave wheel has an extending wall extending downward, and the ring gear of the face gear is located at the periphery of the extending wall.

In order to insert the extension wall into the concave cavity, the upper surface of the face gear is provided with a concave cavity which is concave downwards, the gear ring is positioned at the periphery of the concave cavity, and the extension wall is inserted into the concave cavity. In addition, the face gear can be provided with a slot for inserting the extension wall therein.

In order to reduce friction between the extension wall and the yaw axis, a pair of angular contact ball bearings is provided between the extension wall and the yaw axis.

In order to reduce the manufacturing cost of the fluctuation wheel, the outer circumferential surface of the fluctuation wheel is a circular ring surface.

In order to facilitate fluctuation (nutation or deflection movement) of the fluctuation wheel along the length direction of the deflection shaft, the deflection shaft sequentially comprises a first shaft section, a second shaft section and a third shaft section from top to bottom along the length direction of the deflection shaft, the first shaft section and the third shaft section are coaxially arranged, the axis of the first shaft section is the rotation axis of the deflection shaft, the face gear is arranged on the third shaft section, an acute angle included angle is formed between the axis of the second shaft section and the axis of the first shaft section, the fluctuation wheel is sleeved on the periphery of the second shaft section, and the central line of the fluctuation wheel coincides with the axis of the second shaft section.

In order to reduce friction between the first shaft section and the housing, a tapered roller bearing is arranged between the first shaft section and the housing.

In order to control the axial and radial movement of the wave wheel, a pair of angular contact ball bearings are arranged between the second shaft section and the wave wheel.

Preferably, the needle roller is always meshed with the corresponding position of the inner peripheral surface of the tooth socket in a moving state. Namely, the shape of the tooth slot is limited by the movement track of the needle roller.

Compared with the prior art, the utility model has the advantages that: the roller pin of the speed reduction device is positioned above the bevel gear outside the wave wheel, namely, the roller pin moves upwards, so that the height of the whole speed reduction device is thinned, and a small space is occupied in the height direction. In addition, the outer peripheral surface of the fluctuation wheel is a circular ring surface, the fluctuation wheel is simple to manufacture and low in cost, and the problems of complex manufacture and high cost caused by the adoption of partial spheres in the fluctuation wheel in the background technology are solved.

Drawings

Fig. 1 is a schematic diagram of the structure of a reduction gear unit according to the present embodiment;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of a portion of the structure of FIG. 1;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a schematic view of the exploded perspective view of FIG. 1;

fig. 6 is a schematic view of the structure of a tooth sheave.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 6, the improved reduction gear of the present embodiment includes a yaw shaft 1, a spline wheel 2, a wave wheel 3, a needle roller 4, a face gear 5, and an output member. The output piece is a shell 6, and a containing cavity is formed in the shell 6. In the present embodiment, the yaw shaft 1 is vertically arranged, and is provided to pass through the housing 6, and is rotatable about its own rotation axis, so that the rotation axis of the yaw shaft 1 is vertically arranged. Specifically, the yaw axis 1 includes a first axis segment 11, a second axis segment 12, and a third axis segment 13 in this order from top to bottom along the length direction thereof. The first shaft section 11 and the third shaft section 13 are coaxially arranged, and the axis of the first shaft section 11 is the rotation axis of the off-angle shaft 1, and an acute included angle is formed between the axis of the second shaft section 12 and the axis of the first shaft section 11, and is the wave angle of the wave wheel. A tapered roller bearing 7 is provided between the first shaft section 11 and the housing 6. The third shaft section 13 is provided with a mounting hole 131 extending along an axial direction thereof for the input shaft of the driver to pass therethrough.

As shown in fig. 2 to 4, the tooth sheave 2 is formed in a ring wall shape, is fixed to the inner peripheral wall of the housing 6, is fitted around the angular shaft 1, and has tooth grooves 21 extending in the axial direction thereof formed in the inner peripheral wall of the tooth sheave 2. The wave wheel 3 is sleeved between the second shaft section 12 of the yaw shaft 1 and the spline wheel 2, and is arranged to wave back and forth along the length direction of the yaw shaft 1. The centre line of the wave wheel 3 coincides with the axis of the second shaft section 12. In this embodiment, a pair of angular contact ball bearings 8 are provided between the second shaft section 12 and the extending wall 31 of the wave wheel 3. The wave wheel 3 has a circular ring shape, and the inner peripheral wall of the wave wheel 3 has an extension wall 31 extending in the longitudinal direction of the yaw axis 1, and the wave wheel 3 has an outer bevel gear 32 at a position located on the extension wall 31. The face gear 5 is a fixed gear which is fitted between the third shaft section 13 of the angular shaft 1 and the extension wall 31, and the face gear 5 has a ring gear 52 which meshes with the outer bevel gear 32. The bottom of the housing 6 is provided with a flange 9 fixed to the face gear 5. The tooth grooves 21 are positioned above the gear ring 52, so that the rolling pins move upwards, and the thickness of the whole speed reducer is reduced. The outer bevel gear 32 is located above the ring gear 52 of the face gear 5. The upper surface of the face gear 5 (on the side facing the outer bevel gear 32) has a recess 51 recessed away from the outer bevel gear 32. The ring gear 52 is located at the periphery of the cavity 51, and the extension wall 31 is inserted into the cavity 51. The number of teeth of the outer bevel gear 32 is Z1, the number of teeth of the ring gear 52 of the face gear 5 is Z2, and the reduction ratio of the reduction gear is Z2: (Z1-Z2). (Z1-Z2) > 1, in this embodiment, Z1-z2=1, and the reduction ratio of the reduction gear is Z2:1. the wave wheel swings around the sphere center by one circle, and each tooth on the outer bevel gear and the face gear only make one wave. Under the up-and-down fluctuation of the wave wheel 3, the wave wheel 3 rotates around the rotation axis of the yaw shaft 1 due to the meshing with the ring gear 52.

As shown in fig. 2 and 4, the first end of the needle roller 4 is rotatably restrained on the outer peripheral wall of the wave wheel 3 and is located above the bevel gear 32 outside the wave wheel 3. The second end of the needle roller 4 is positioned in the tooth groove 21, and the needle roller 4 is always meshed with the corresponding position of the tooth groove 21 in a moving state. The specific shape of the tooth groove 21 is defined by the movement track of the needle roller 4.

In the process of the fluctuation wheel rotation, the fluctuation wheel is linked with the tooth socket wheel through the needle roller, so that the tooth socket wheel and the shell are driven to rotate around the rotation axis of the eccentric shaft 1.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Claims

1. An improved speed reduction device comprising:

-a yaw shaft (1) arranged vertically and arranged rotatable about its own axis of rotation;

the tooth groove wheel (2) is in a ring wall shape and sleeved on the periphery of the deflection shaft (1), and a tooth groove (21) extending along the axial direction of the tooth groove wheel is formed in the inner peripheral wall of the tooth groove wheel (2);

the fluctuation wheel (3) is annular and sleeved between the deflection shaft (1) and the tooth groove wheel (2), and an outer bevel gear (32) is arranged on the lower surface of the fluctuation wheel (3);

the face gear (5) is sleeved on the periphery of the deflection shaft (1) and is provided with a gear ring (52) which is positioned below the outer bevel gear and is meshed with the outer bevel gear (32), so that the wave wheel (3) is driven to wave back and forth along the length direction of the deflection shaft (1);

a needle roller (4) having a first end rotatably restrained to the outer peripheral wall of the wave wheel (3), and a second end of the needle roller (4) being positioned in the tooth groove (21);

an output member, the power input end of which is linked with the face gear (5) or the wave wheel (3), so that the output member rotates around the rotation axis of the off-angle shaft (1);

the method is characterized in that: the first end of the needle roller (4) is positioned above a bevel gear (32) outside the wave wheel (3).

2. A reduction gear as claimed in claim 1, wherein: the tooth slot (21) is located above the ring gear (52) of the face gear (5).

3. A reduction gear as claimed in claim 1, wherein: the output piece is a shell (6), a containing cavity is formed in the shell (6), the tooth socket wheel (2) is fixed on the inner peripheral wall of the shell (6), and the face gear (5) is a fixed gear.

4. A reduction gear as claimed in claim 1, wherein: the outer peripheral surface of the wave wheel (3) is a circular ring surface.

5. A reduction gear as claimed in claim 1, wherein: the inner peripheral wall of the wave wheel (3) has an extending wall (31) extending downward, and the ring gear (52) of the face gear (5) is located at the periphery of the extending wall (31).

6. The reduction gear as defined in claim 5, wherein: the upper surface of the face gear (5) is provided with a concave cavity (51) which is concave downwards, the gear ring (52) is positioned at the periphery of the concave cavity (51), and the extension wall (31) is inserted into the concave cavity (51).

7. A reduction gear as claimed in claim 3, wherein: the off-angle shaft (1) sequentially comprises a first shaft section (11), a second shaft section (12) and a third shaft section (13) from top to bottom along the length direction of the off-angle shaft, the first shaft section (11) and the third shaft section (13) are coaxially arranged, the axis of the first shaft section (11) is the rotation axis of the off-angle shaft (1), the face gear (5) is mounted on the third shaft section (13), an acute angle included angle is formed between the axes of the second shaft section (12) and the first shaft section (11), the periphery of the second shaft section (12) is sleeved with the wave wheel (3), and the central line of the wave wheel (3) coincides with the axis of the second shaft section (12).

8. The reduction gear as defined in claim 7, wherein: a tapered roller bearing (7) is arranged between the first shaft section (11) and the housing (6).

9. The reduction gear as defined in claim 7, wherein: a pair of angular contact ball bearings (8) is arranged between the second shaft section (12) and the wave wheel (3).

10. The reduction gear as claimed in any one of claims 1 to 9, wherein: the needle roller (4) is always meshed with the corresponding position of the inner peripheral surface of the tooth groove (21) in a moving state.