CN110848339A - A planetary gear reducer - Google Patents

Abstract

In the planetary gear reducer provided by the present invention, the secondary sun gear is provided with a first tooth meshing with the primary planet carrier and a second tooth meshing with the secondary planetary gear, and the second tooth tip circle is formed. The radius of the tooth is larger than the radius of the addendum circle of the first tooth, so that when the secondary sun gear moves axially to the left, the left end face of the second tooth is blocked by the right end face of the primary planet carrier; The end face of the first tooth is provided with a mounting hole, and the inner wall of the mounting hole is provided with a pin hole extending outwardly through the first tooth, and a pin is arranged in the pin hole, so that the pin has an outwardly protruding tip circle of the first tooth. At the end of the pin, a groove for accommodating the end of the pin is provided on the end face of the first-stage planet carrier away from the second tooth, so that when the second-stage sun gear moves to the right, the pin is blocked by the bottom wall of the groove, so that the Compared with the prior art, the axial limit of the secondary sun gear can shorten the axial dimension of the reducer and enhance the strength of the spline.

Description

A planetary gear reducer

technical field

The present invention relates to the field of planetary gear reducers.

Background technique

The planetary gear reducer is a device used to reduce the speed and increase the torque. The general planetary gear reducer includes at least two stages of planetary transmission mechanisms, and each stage of the planetary transmission mechanism includes at least a planetary gear, a planetary carrier, a sun gear, a ring gear, and a planetary gear. The wheel meshes with the sun gear and the ring gear at the same time, and the secondary sun gear also meshes with the primary planet carrier to complete the transmission of power. The axial movement of the secondary sun gear will affect the transmission efficiency of the above power, usually in the second stage. Both ends of the secondary sun gear are provided with larger diameter wear pads and the structure of the circlip restricts the axial movement of the secondary sun gear, but the larger diameter wear pads will increase the axial size of the planetary gear reducer. And weaken the strength of the planet carrier connecting splines.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a planetary gear reducer which can not only limit the axial movement of the secondary sun gear, but also reduce the axial dimension and enhance the strength of the spline connecting the planet carrier.

In order to achieve the above purpose, the technical solution adopted in the present invention is a planetary gear reducer, comprising:

body;

A first-level planetary transmission mechanism, the first-level planetary transmission mechanism is arranged in the body, and the first-level planetary transmission mechanism includes a first-level planet carrier, a first-level planetary gear, a first-level ring gear, and a first-level sun gear. a first-stage planetary gear is rotatably arranged on the first-stage planet carrier, and the first-stage planetary gear meshes with the first-stage ring gear and the first-stage sun gear at the same time;

A secondary planetary transmission mechanism, the secondary planetary transmission mechanism is arranged in the body, and the secondary planetary transmission mechanism includes a secondary planet carrier, a secondary planetary gear, a secondary ring gear, and a secondary sun gear. The secondary planetary gear is rotatably arranged on the secondary planet carrier, and the secondary planetary gear meshes with the secondary ring gear and the secondary sun gear simultaneously;

the secondary sun gear meshes with the primary planet carrier;

The second-stage sun gear is provided with a first tooth meshing with the first-stage planet carrier and a second tooth meshing with the second-stage planetary gear, and the first tooth and the second tooth are both located at On the outer circumferential surface of the secondary sun gear, the radius of the addendum circle of the second tooth is larger than the radius of the addendum circle of the first tooth;

The end surface of the secondary sun gear close to the first tooth is provided with a mounting hole extending along the axial direction of the secondary sun gear, and the inner wall of the mounting hole is provided with a perpendicular to the inner wall extending outward through the second sun gear. A pin hole of a tooth, the pin hole is provided with a pin, the pin has a pin end protruding outward from the tooth top of the first tooth, and the end face of the first-stage planet carrier is away from the second tooth provided with a groove for receiving the end of the pin;

The mounting hole is provided with a wear pad to prevent the pin from falling out of the pin hole, the outer circumferential surface of the wear pad is in contact with the inner wall of the mounting hole, and the right side of the wear pad The side end face is fitted with the bottom wall of the mounting hole.

Preferably, the tooth height of the second teeth is higher than that of the first teeth.

Preferably, the radius of the second tooth root circle is equal to the radius of the first tooth root circle.

Preferably, there are multiple pin holes, and the multiple pin holes are evenly distributed along the inner wall of the mounting hole.

Preferably, the wear pad is provided with a jack screw hole.

Further preferably, the top wire hole is away from the center of the wear pad.

Further preferably, the end of the first-level sun gear close to the first-level planet carrier is provided with a rightwardly protruding protruding portion, and the right end face of the protruding portion abuts the left end face of the wear pad. the middle of.

Further preferably, the diameter of the protruding portion is smaller than the diameter of the wear pad.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

In the planetary gear reducer provided by the present invention, the secondary sun gear is provided with a first tooth meshing with the primary planet carrier and a second tooth meshing with the secondary planetary gear, and the second tooth tip circle is formed. The radius of the tooth is larger than the radius of the addendum circle of the first tooth, so that when the secondary sun gear moves axially to the left, the left end face of the second tooth is blocked by the right end face of the primary planet carrier; The end face of the first tooth is provided with a mounting hole, and the inner wall of the mounting hole is provided with a pin hole extending outwardly through the first tooth, and a pin is arranged in the pin hole, so that the pin has an outwardly protruding tip circle of the first tooth. At the end of the pin, a groove for accommodating the end of the pin is provided on the end face of the first-stage planet carrier away from the second tooth, so that when the second-stage sun gear moves to the right, the pin is blocked by the bottom wall of the groove, so that the The axial limitation of the secondary sun gear can shorten the axial dimension of the planetary gear reducer, and enhance the The strength of the connecting splines between the secondary sun gear and the primary planet carrier.

Description of drawings

FIG. 1 is a schematic front view of the present invention, partially cut away.

FIG. 2 is an enlarged view of A in FIG. 1 .

FIG. 3 is a schematic front view of the first-level planet carrier in the present invention.

4 is a schematic cross-sectional view of the secondary sun gear in the present invention.

FIG. 5 is a schematic front view of the wear pad of the present invention.

Among them: 101. Body; 200. Primary planetary transmission mechanism; 201. Primary planetary carrier; 202. Primary planetary gear; 203. Primary ring gear; 204. Primary sun gear; 300. Secondary planetary transmission mechanism; 301. Secondary planet carrier; 302. Secondary planet gear; 303. Secondary ring gear; 304. Secondary sun gear; 3041. First tooth; 3042. Second tooth; 3043. Mounting hole; 3044. Pin hole; 3045. Pins; 3046. Wear pads.

Detailed ways

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings:

The left and right directions in the present invention refer to the left and right directions in FIG. 1 .

As shown in FIG. 1, the planetary gear reducer provided by the present invention includes: a body 100, a primary planetary transmission mechanism 200, and a secondary planetary transmission mechanism 300, wherein the primary planetary transmission mechanism 200 and the secondary planetary transmission mechanism 300 are both Disposed in the body 100, the first-level planetary transmission mechanism 200 is located on the left side of the second-level planetary transmission mechanism 300, and the first-level planetary transmission mechanism 200 includes a first-level planet carrier 201, a first-level planetary gear 202, a first-level ring gear 203, a first-level planetary gear The sun gear 204, the primary planetary gear 202 is rotatably arranged on the primary planet carrier 201, the primary ring gear 203 is fixed on the inner wall of the body 100, the left end of the primary sun gear 204 is connected with the input shaft, the primary The planetary gear 202 meshes with the primary ring gear 203 and the primary sun gear 204 at the same time. When the input shaft transmits the external power to the primary sun gear 204, it drives the primary sun gear 204 to rotate, so that the primary planetary gear 202 rotates along with it. , when the first-level planetary gear 202 rotates between the first-level ring gear 203 and the first-level sun gear 204, it will drive the first-level planet carrier 201 to rotate;

The secondary planetary transmission mechanism 300 includes a secondary planetary carrier 301, a secondary planetary gear 302, a secondary ring gear 303, and a secondary sun gear 304. The secondary planetary gear 302 is rotatably arranged on the secondary planetary carrier 301, and the secondary The planetary gear 302 meshes with the secondary ring gear 303 and the secondary sun gear 304 at the same time, and the secondary sun gear 304 meshes with the primary planet carrier 201. When the primary planet carrier 201 rotates, it drives the secondary sun gear 304 to rotate, The secondary planetary gear 302 is rotated, and when the secondary planetary gear 302 rotates between the secondary sun gear 304 and the secondary ring gear 303, it drives the secondary planetary carrier 301 to rotate, so as to transmit the external power from the primary planetary carrier 201 to the secondary planetary carrier 201. Secondary planet carrier 301;

The secondary sun gear 304 is provided with a first tooth 3041 meshing with the primary planet carrier 201 and a second tooth 3042 meshing with the secondary planetary gear 302 , the first tooth 3041 and the second tooth 3042 are both located at the secondary center On the outer circumference of the gear 304, the radius of the addendum circle of the second tooth 3042 is greater than the radius of the addendum circle of the first tooth 3041, and the radius of the root circle of the second tooth 3042 is equal to the radius of the root circle of the first tooth 3041, so that the second tooth 3041 has a root circle radius. The tooth height of the teeth 3042 is higher than the tooth height of the first teeth 3041 , that is, the tooth height of the second teeth 3042 is higher than the tooth height of the matching teeth on the first-level planet carrier 201 matched with the first teeth 3041 . The advantage is that when the secondary sun gear 304 is about to move to the left along its axial direction, the left end face of the second tooth 3042 will be blocked by the right end face of the primary planet carrier 201, so that the secondary sun gear 304 cannot move along its axis. move to the left;

The left end surface of the secondary sun gear 304 is provided with a mounting hole 3043 extending to the right along its axial direction, and the inner wall of the mounting hole 3043 is provided with a pin hole 3044 extending outwardly through the first tooth 3041 perpendicular to the inner wall. There are a plurality of 3044, the pin holes 3044 are evenly distributed along the inner wall of the mounting hole 3043, the pin holes 3044 are circular through holes, and the pins 400 are arranged in the pin holes 3044. The pin end 401, the left end face of the first-stage planet carrier 202 is provided with a groove 2011 extending to the right for accommodating the pin end 401. The advantage of this setting is that when the second-stage sun gear 304 is about to be axially rightward When moving, the pin end 401 is blocked by the groove 2011, so that the secondary sun gear 304 cannot move to the right along its axial direction. The axial dimension of the planetary gear reducer, since the pin 400 is arranged in the pin hole 3044 on the secondary sun gear 304, and the pin end 401 of the pin 400 is inserted into the groove 2011 on the primary planet carrier 202, after the two When the spline engaged between the secondary sun gear 304 and the primary planet carrier 202 is broken, an additional force for cutting off the pin 400 needs to be provided, which is equivalent to enhancing the spline strength when the secondary sun gear 304 meshes with the primary planet carrier 202;

The mounting hole 3043 is also provided with a wear-resistant pad 500 for placing the pin 400 from the pin hole 3044. The outer circumferential surface of the wear-resistant pad 500 is in contact with the inner wall of the mounting hole 3043. The bottom wall of the mounting hole 3043 is in contact with each other, and the position of the wear pad 500 away from the center is provided with a jack screw hole 501. The jack screw hole 501 is used to take the wear pad 500 out of the mounting hole 3043. The side end is provided with a protruding portion 2041 protruding to the right.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the scope of protection of the present invention with this. Equivalent changes or modifications made in the spirit and spirit should all be included within the protection scope of the present invention.

Claims (8)

1. A planetary gear reducer, comprising: body; A first-level planetary transmission mechanism, the first-level planetary transmission mechanism is arranged in the body, and the first-level planetary transmission mechanism includes a first-level planet carrier, a first-level planetary gear, a first-level ring gear, and a first-level sun gear. a first-stage planetary gear is rotatably arranged on the first-stage planet carrier, and the first-stage planetary gear meshes with the first-stage ring gear and the first-stage sun gear at the same time; A secondary planetary transmission mechanism, the secondary planetary transmission mechanism is arranged in the body, and the secondary planetary transmission mechanism includes a secondary planet carrier, a secondary planetary gear, a secondary ring gear, and a secondary sun gear. The secondary planetary gear is rotatably arranged on the secondary planet carrier, and the secondary planetary gear meshes with the secondary ring gear and the secondary sun gear simultaneously; the secondary sun gear meshes with the primary planet carrier; It is characterized by: The second-stage sun gear is provided with a first tooth meshing with the first-stage planet carrier and a second tooth meshing with the second-stage planetary gear, and the first tooth and the second tooth are both located at On the outer circumferential surface of the secondary sun gear, the radius of the addendum circle of the second tooth is larger than the radius of the addendum circle of the first tooth; The middle of the end face of the secondary sun gear close to the first tooth is provided with a mounting hole extending along the axial direction of the secondary sun gear, and the inner wall of the mounting hole is provided with a perpendicular to the inner wall extending outward through the The pin hole of the first tooth, the pin hole is provided with a pin, the pin has a pin end that protrudes outward from the tooth top of the first tooth, and the first-stage planet carrier is away from the second tooth. the end face is provided with a groove for accommodating the end of the pin; The mounting hole is provided with a wear pad to prevent the pin from falling out of the pin hole, the outer circumferential surface of the wear pad is in contact with the inner wall of the mounting hole, and the right side of the wear pad The side end face is fitted with the bottom wall of the mounting hole. 2 . The planetary gear reducer according to claim 1 , wherein the tooth height of the second teeth is higher than that of the first teeth. 3 . 3 . The planetary gear reducer according to claim 1 , wherein the radius of the second tooth root circle is equal to the radius of the first tooth root circle. 4 . 4 . The planetary gear reducer according to claim 1 , wherein there are a plurality of the pin holes, and the plurality of pin holes are evenly distributed along the inner wall of the installation hole. 5 . 5 . The planetary gear reducer according to claim 1 , wherein the wear pad is provided with a jack screw hole. 6 . 6 . The planetary gear reducer according to claim 5 , wherein the top screw hole is away from the center of the wear pad. 7 . 7. The planetary gear reducer according to any one of claims 1-6, wherein the end of the first-stage sun gear close to the first-stage planet carrier is provided with a rightwardly protruding protrusion , the right end face of the protruding part abuts the middle part of the left end face of the wear pad. 8. The planetary gear reducer according to claim 7, wherein the diameter of the protruding portion is smaller than the diameter of the wear pad.

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