CN211778848U - Bevel gear - Google Patents

Abstract

The utility model provides a bevel gear, which belongs to the technical field of gear manufacturing. It solves the problem of meshing wear of the gear body in the existing bevel gear. The bevel gear includes a gear body with a shaft hole, the gear body is provided with external gear teeth inclined to the axis direction of the gear body, and the external gear teeth include a tooth tip, a left tooth surface, a right tooth surface and a tooth root, and the left tooth surface The pressure angle formed with the gear body is greater than the pressure angle formed by the right tooth surface and the gear body, wherein the gear bodies in the two radially opposite outer gear teeth are provided with centrifugal force generated when the gear body rotates. The oil through the tooth top of the gear lubricates the left tooth surface and the right tooth surface. The utility model has the advantages of reasonable and simple structure design, small wear, preventing radial runout of meshing, convenient installation, long service life, good working stability, and can avoid vibration.

Description

a bevel gear

technical field

The utility model belongs to the technical field of gear manufacturing, and relates to a bevel gear.

Background technique

The bevel gear is an important part of the automobile differential. Its structure is that the bevel teeth face outward, and the spline shaft hole is built in the center. In order to reduce wear, there is a gasket between the differential housing and the side gear.

When in use, there is a direct contact between the bevel gear and the gasket. When the bevel gear rotates, it is easy to rub against the gasket. The wear of the gasket decreases and the backlash increases. cause the gears to rattle.

The existing bevel gear and the gasket are fitted with an additional oil groove. The oil grooves are straight grooves and arc grooves. Although a certain lubricity can be ensured, due to the small contact oil surface and the small oil storage capacity of the oil groove, the bevel gear is in the When working at high speed and high load, there may be insufficient lubrication, resulting in serious ablation or wear of the gasket. In addition, the tooth root of the external gear has concentrated stress, weak rigidity, weak bearing capacity, low compressive strength, and prone to broken teeth. Phenomenon.

SUMMARY OF THE INVENTION

The purpose of the utility model is to solve the above problems existing in the prior art, and to provide a bevel gear with a simple structure, which can automatically squeeze the oil when the outer gear teeth mesh to ensure sufficient lubrication.

The purpose of the utility model can be achieved by the following technical solutions: a bevel gear, comprising a gear body with a shaft hole, the gear body is provided with external gear teeth inclined to the axis direction of the gear body, and two adjacent external gears A tooth slot is formed between the teeth. The outer gear teeth include a tooth tip, a left tooth surface, a right tooth surface and a tooth root. The pressure angle formed by the left tooth surface and the gear body is larger than that of the right tooth surface and the gear body. The pressure angle is formed. When the bevel gear is working, the left tooth surface with a large pressure angle is taken as the meshing side, and the right tooth surface with a small pressure angle is the non-meshing side. The gear body is provided with an oil-passing device for lubricating the left tooth surface and the right tooth surface through the action of centrifugal force generated when the gear body rotates.

The main shaft of the bevel gear is provided with an oil-passing device on the gear body inside the two outer gear teeth, the outer gear teeth are lubricated by the oil-passing device, and the oil-passing device supplies oil by itself by the centrifugal force generated when the gear body rotates, which can effectively avoid Insufficient lubrication occurs, resulting in ablation or severe wear of the gasket.

In the above-mentioned bevel gear, the inner wall of the shaft hole of the gear body has radially arranged two-way oil grooves, the two-way oil grooves are radially symmetrically distributed in the gear body, and the groove bottoms of the two-way oil grooves are both Oil through holes which are respectively communicated with the tooth tops of the two radially opposite outer gear teeth are provided. The purpose of this setting is to make the oil in the oil channel directly communicate with the tooth tops of the outer gear teeth, and the tooth tops of the two outer gear teeth are lubricated to the adjacent outer gear teeth, so that the lubrication is uniform and the lubrication effect is better.

In the above-mentioned bevel gear, the oil-passing device comprises a cylindrical piston correspondingly arranged in the oil-passing groove, the cylindrical piston slides in the oil-passing groove and divides the oil-passing groove into a pushing cavity and a reset cavity, and the The pushing cavity is communicated with the corresponding oil passage hole and is filled with oil for lubricating, the pushing cavity is provided with a compression spring that elastically acts on the cylindrical piston, and one end of the compression spring elastically abuts against the push cavity. At the bottom of the cavity, the other end of the compression spring elastically rests on the cylindrical piston, and the centrifugal force generated when the gear body rotates in the circumferential direction drives the cylindrical piston to move radially in the oil channel to overcome the elastic force of the compression spring, pushing the cavity And the oil in the corresponding oil hole is pushed out for oil lubrication. When the gear body stops rotating in the circumferential direction, the centrifugal force generated when the gear body rotates is lost, and the elastic force of the compression spring makes the cylindrical piston reset in the oil channel. The push chamber and the corresponding oil passage hole are in a negative pressure state to stop oil output. The radial displacement of the cylindrical piston in the oil passage is determined by the centrifugal force generated when the gear body rotates in the circumferential direction, and the oil passage effect is better.

In the above-mentioned bevel gear, the groove of the oil passage is also provided with a circular block to prevent the cylindrical piston from leaving the oil passage, and a circular block is arranged between the circular block and the gear body to enable the circular The connection structure in which the shaped blocking block is fixedly connected to the notch of the oil passage of the gear body. The purpose of this setting is to effectively prevent the cylindrical piston from escaping from the oil passage through the blocking of the circular blocking block.

In the above-mentioned bevel gear, the connecting structure includes an elastic ring in the shape of an opening, an annular groove 1 is provided on the notch wall of the oil passage groove of the gear body, and the elastic ring is located in the annular groove 1 , the outer cylindrical surface of the circular blocking block is provided with an annular groove two, when the circular blocking block is located at the notch of the oil channel of the gear body, the elastic ring card is located between the circular groove 1 and the annular groove 2 Make the circular block and the gear body fixedly connected. The purpose of this setting is to facilitate the installation of the circular blocking block on the notch wall of the oil channel of the gear body; there is a circumferential distance between the head end and the end of the elastic ring, and the elastic ring passes through the circumferential direction between the head end and the end. The spacing is deformed and assembled, which is convenient for assembly.

In the above-mentioned bevel gear, the outer wall of the circular blocking block is a circular arc surface, and the radian of the outer wall of the circular blocking block is the same as the radian of the shaft hole of the gear body. When located at the notch of the oil passage of the gear body, the outer wall of the circular blocking block is flush with the inner wall of the shaft hole of the gear body.

In the above-mentioned bevel gear, an annular sealing groove is arranged on the outer wall of the cylindrical piston, and a sealing ring is arranged in the annular sealing groove. When the cylindrical piston is in the oil-passing groove, the sealing ring elastically acts on the on the wall of the oil tank. The purpose of this arrangement is to effectively prevent the oil in the push cavity and the corresponding oil passage hole from leaking to the reset cavity, and to ensure the effectiveness of the separation seal between the push cavity and the reset cavity.

Compared with the prior art, the advantages of the bevel gear are: the structure design is reasonable and simple, the propelling cavity is connected with the corresponding oil passage hole and is filled with oil for lubrication, the oil storage capacity is large, and it is extruded through the cylindrical piston. Oil, good lubricating effect, small wear, long service life, good meshing transmission stability and low noise.

Description of drawings

Figure 1 is a schematic sectional view of the bevel gear.

FIG. 2 is a schematic three-dimensional structure diagram of a single outer gear tooth in the bevel gear.

Figure 3 is a schematic cross-sectional structural diagram of a circular blocking block in the bevel gear.

Figure 4 is a schematic front view of the structure of the elastic ring in the bevel gear.

In the figure, 1, shaft hole; 2, gear body; 2a, annular groove 1; 3, outer gear teeth; 4, tooth tip; 5, left tooth surface; 6, right tooth surface; 7, tooth root; 8, oil passage; 9, oil passage; 10, cylindrical piston; 11, compression spring; 12, circular block; 12a, annular groove two; 13, elastic ring; 14, sealing ring.

Detailed ways

The following are specific embodiments of the present utility model combined with the accompanying drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

As shown in Figures 1 and 2, the bevel gear is mainly composed of a gear body 2 with a shaft hole 1. The gear body 2 is provided with external gear teeth 3 inclined to the axis direction of the gear body 2, and two adjacent external gear teeth 3 A tooth slot is formed between the teeth. The outer gear tooth 3 includes the tooth top 4, the left tooth surface 5, the right tooth surface 6 and the tooth root 7. The left tooth surface 5 and the gear body 2 form a pressure angle greater than the right tooth surface 6 and the gear. The body 2 forms a pressure angle. When the bevel gear is working, the left tooth surface 5 with a large pressure angle is taken as the meshing side, and the right tooth surface 6 with a small pressure angle is the non-meshing side. The gear body 2 is provided with an oil-passing device that lubricates the left tooth surface 5 and the right tooth surface 6 by the centrifugal force generated when the gear body 2 rotates.

Specifically, the inner wall of the shaft hole 1 of the gear body 2 has two-way oil grooves 8 arranged in a radial direction. The two-way oil grooves 8 are relatively symmetrically distributed in the radial direction in the gear body 2. The oil passages 9 correspondingly communicate with the tooth tops 4 of the two diametrically opposite outer gear teeth 3 respectively; in actual manufacture, the specific implementation of the oil passage is: mainly composed of cylindrical pistons correspondingly arranged in the oil passage 8 10, the cylindrical piston 10 slides in the oil passage 8 and separates the oil passage 8 into a push cavity and a reset cavity, the push cavity is communicated with the corresponding oil pass hole 9 and is filled with oil for lubrication, and the push cavity is provided with elastic The compression spring 11 acting on the cylindrical piston 10, one end of the compression spring 11 elastically abuts against the cavity bottom of the push cavity, and the other end of the compression spring 11 elastically abuts on the cylindrical piston 10, and the generated when the gear body 2 rotates in the circumferential direction. The centrifugal force drives the radial displacement of the cylindrical piston 10 in the oil passage 8 to overcome the elastic force of the compression spring 11, and the oil in the push chamber and the corresponding oil passage 9 is pushed out for oil lubrication. When the gear body 2 stops rotating in the circumferential direction, When the centrifugal force generated by the rotation of the gear body 2 is lost, and the elastic force of the compression spring 11 abuts the cylindrical piston 10 in the oil passage 8, the pushing chamber and the corresponding oil passage hole 9 are in a negative pressure state to stop oil output; During design, an annular sealing groove is arranged on the outer wall of the cylindrical piston 10, and a sealing ring 14 is arranged in the annular sealing groove. When the cylindrical piston 10 is in the oil passage 8, the sealing ring 14 elastically acts on the groove wall of the oil passage 8. superior. This arrangement can ensure the effectiveness of the separation seal between the push cavity and the reset cavity.

During actual manufacture, as shown in FIG. 3 , a circular blocking block 12 for preventing the cylindrical piston 10 from being separated from the oil passing groove 8 is also provided at the notch of the oil passage 8 . A connection structure that enables the circular blocking block 12 to be fixedly connected to the notch of the oil passage 8 of the gear body 2 . As shown in FIG. 4 , in the actual design, the specific embodiment of the connection structure is as follows: it is mainly composed of an elastic ring 13 in the shape of an opening, and an annular groove 1 2a is provided on the notch wall of the oil passage 8 of the gear body 2 . The ring 13 is located in the annular groove one 2a, and the outer cylindrical surface of the circular blocking block 12 is provided with an annular groove two 12a. When the circular blocking block 12 is in the notch of the oil channel 8 of the gear body 2, the elastic ring 13 The card is located between the first annular groove 2a and the second annular groove 12a, so that the circular blocking block 12 and the gear body 2 are fixedly connected; The radian of the outer wall is the same as the radian of the shaft hole 1 of the gear body 2. When the circular blocking block 12 is at the notch of the oil passage 8 of the gear body 2, the outer wall of the circular blocking block 12 and the shaft of the gear body 2 The inner wall of hole 1 is flush.

Contents not described in detail in this specification belong to the prior art known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or replace them in similar ways, but will not deviate from the spirit of the present invention or go beyond the appended claims the defined range.

Claims (7)

1. A bevel gear comprises a gear body (2) with a shaft hole (1), wherein outer gear teeth (3) inclined to the axis direction of the gear body (2) are arranged on the gear body (2), a tooth space is formed between every two adjacent outer gear teeth (3), each outer gear tooth (3) comprises a tooth crest (4), a left tooth flank (5), a right tooth flank (6) and a tooth root (7), a pressure angle formed by the left tooth flank (5) and the gear body (2) is larger than a pressure angle formed by the right tooth flank (6) and the gear body (2), when the bevel gear works, the left tooth flank (5) with a large pressure angle is taken as a meshing side, and the right tooth flank (6) with a small pressure angle is taken as a non-meshing side, and the bevel gear is characterized in that the gear body (2) in the two radially opposite outer gear teeth (3) is provided with oil discharged from the tooth crests (4) of the two corresponding outer gear teeth (3) under the effect of centrifugal force generated when the gear body (2) rotates to lubricate the left tooth And an oil passing device of the right side tooth surface (6).

2. The bevel gear according to claim 1, wherein the inner wall of the shaft hole (1) of the gear body (2) is provided with two oil through grooves (8) which are radially arranged, the two oil through grooves (8) are radially and symmetrically distributed in the gear body (2), and oil through holes (9) which are respectively communicated with the tooth tops (4) of the two radially opposite external gear teeth (3) are respectively formed in the groove bottoms of the two oil through grooves (8).

3. The bevel gear according to claim 2, wherein the oil passing device comprises a cylindrical piston (10) correspondingly disposed in the oil passing groove (8), the cylindrical piston (10) is slidably disposed in the oil passing groove (8) and divides the oil passing groove (8) into a pushing chamber and a returning chamber, the pushing chamber is communicated with the corresponding oil passing hole (9) and is filled with oil for lubrication, a compression spring (11) elastically acting on the cylindrical piston (10) is disposed in the pushing chamber, one end of the compression spring (11) elastically abuts against the bottom of the pushing chamber, the other end of the compression spring (11) elastically abuts against the cylindrical piston (10), and when centrifugal force generated when the gear body (2) rotates circumferentially drives the cylindrical piston (10) to move radially in the oil passing groove (8) and overcome the elastic force of the compression spring (11), the oil liquid in the pushing cavity and the corresponding oil through hole (9) is pushed out for oil lubrication, when the gear body (2) stops rotating in the circumferential direction and loses the effect of centrifugal force generated when the gear body (2) rotates, the elastic force of the compression spring (11) abuts against the columnar piston (10) to reset in the oil through groove (8), and the pushing cavity and the corresponding oil through hole (9) are in a negative pressure state to stop oil outlet.

4. The bevel gear according to claim 3 wherein a circular block (12) for preventing the cylindrical piston (10) from separating from the oil channel (8) is further disposed at the notch of the oil channel (8), and a connection structure for fixedly connecting the circular block (12) to the notch of the oil channel (8) of the gear body (2) is disposed between the circular block (12) and the gear body (2).

5. The bevel gear according to claim 4, wherein the connecting structure comprises an open elastic ring (13), a first annular groove (2 a) is formed in a groove opening wall of the oil through groove (8) of the gear body (2), the elastic ring (13) is located in the first annular groove (2 a), a second annular groove (12 a) is formed in an outer cylindrical surface of the circular block (12), and when the circular block (12) is located at a groove opening of the oil through groove (8) of the gear body (2), the elastic ring (13) is clamped between the first annular groove (2 a) and the second annular groove (12 a) to fixedly connect the circular block (12) and the gear body (2).

6. The bevel gear according to claim 5 characterized in that the outer wall of the circular block (12) is a circular arc surface, the radian of the outer wall of the circular block (12) is the same as the radian of the shaft hole (1) of the gear body (2), and when the circular block (12) is positioned at the notch of the oil through groove (8) of the gear body (2), the outer wall of the circular block (12) is flush with the inner wall of the shaft hole (1) of the gear body (2).

7. Bevel gear according to claim 6, characterized in that the outer wall of the cylindrical piston (10) is provided with an annular sealing groove, in which a sealing ring (14) is arranged, which sealing ring (14) elastically acts on the wall of the oil through groove (8) when the cylindrical piston (10) is in the oil through groove (8).

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