CN212717878U

CN212717878U - Transmission worm

Info

Publication number: CN212717878U
Application number: CN202021491262.XU
Authority: CN
Inventors: 董西杰; 方雳; 潘金迪
Original assignee: Zhejiang Huifeng Auto Parts Co ltd
Current assignee: Zhejiang Huifeng Auto Parts Co ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-03-16
Anticipated expiration: 2030-07-27

Abstract

The utility model provides a transmission worm belongs to auto-parts technical field. The transmission worm solves the problems that the existing transmission worm is not high in structural strength, not compact in structure and the like. The transmission worm comprises a rod-shaped body, wherein spiral transmission teeth are arranged on the body, one to two circles of guide teeth with gradually increased outer diameters and spirally connected to the transmission teeth are arranged at two ends of the transmission teeth, the ratio of the tooth top thickness to the tooth root thickness of the transmission teeth is 3:10, the tooth top thickness is gradually increased to the tooth root thickness, the tooth top thickness of the transmission teeth is at least one millimeter, a radial outwards-protruding limiting convex ring is arranged on one side of the transmission teeth of the body, and a section of external spline is arranged on the other side of the transmission teeth of the body. The utility model has the advantages of compact structure, high structural strength and high transmission efficiency.

Description

Transmission worm

Technical Field

The utility model belongs to the technical field of auto-parts, a brake accessory, in particular to transmission worm is related to.

Background

The worm is an important component of a worm gear and worm transmission device, the worm transmission is gear transmission between staggered shafts formed by meshing the worm and the worm wheel, and the worm gear and worm transmission device has the advantages of large transmission ratio, stable transmission, compact structure and the like.

For example, chinese patent document patent discloses a worm for automobile brake [ application number: 201721698856.6, respectively; authorization notice number: CN207879881U ], which comprises a worm shaft and a motor shaft, wherein one end of the motor shaft is in transmission connection with a motor, a convex ring is arranged on the periphery of the other end of the motor shaft, first gear teeth are arranged on the periphery of the convex ring, a groove matched with the end part of the motor shaft is arranged at one end of the worm shaft close to the motor shaft, second gear teeth matched with the first gear teeth in an insertion way are arranged on the peripheral wall of the groove of the worm shaft, external threads are arranged on the periphery of one end of the second gear teeth on the worm shaft, a spiral part matched with a worm wheel is arranged on the periphery of one end of the worm shaft far away from the motor shaft, a connecting cover is sleeved on the periphery of the motor shaft and comprises a first circular ring part and a second circular ring part which are mutually connected, the first circular ring part is movably sleeved on the motor shaft and is in limit fit with the convex ring, internal threads matched with the external threads are arranged on, the axial limiting of the worm shaft and the motor shaft is realized through the threaded connection of the internal thread and the external thread.

The worm for the automobile brake is more compact and stable in connection and can prevent abrasion and breakage, but the worm is not thick enough in tooth thickness, the strength and the transmission efficiency of the worm are affected, a gear or a spline sleeve needs to be assembled for transmission, and the structure is still not compact enough.

Disclosure of Invention

The utility model aims at the above-mentioned problem that exists among the prior art, provide a compact structure, structural strength height and the high transmission worm of transmission efficiency.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a drive worm, is including being shaft-like body, the body on have and be spiral helicine driving gear, its characterized in that, the body all have one to two rings of external diameter crescent and the spiral meet in the guide tooth of driving gear in the both ends of driving gear, the ratio of addendum thickness and tooth root thickness of driving gear be 3:10 and addendum thickness progressively increases to tooth root thickness, the addendum thickness of driving gear be one millimeter at least, the body have the spacing bulge loop of radial evagination in one side of driving gear, the body has one section external splines in the opposite side of driving gear.

In the above-mentioned transmission worm, the end of the body on the side of the limit convex ring has an elastic structure for elastic support. The elastic structure plays an elastic supporting role on the body, axial movement in the working process of the body is avoided, the body works stably, and abnormal sound cannot be emitted.

In the above-mentioned transmission worm, the elastic structure includes that the body is provided with a blind hole in the axial direction of the end part of the side of the limit convex ring, the blind hole and the body are coaxially arranged, and a spring is arranged in the blind hole.

As another aspect, in the above-mentioned worm gear, the elastic structure includes a rubber pad adhered to an end of the body on the side of the limit ring.

In the above transmission worm, the external spline protrudes radially from the outer wall of the body.

In the above transmission worm, the external spline has a plurality of annular grooves axially and uniformly distributed.

In the above-mentioned drive worm, the inner end of the limit bulge loop is transited to the outer wall of the body through the conical surface, and the outer end of the limit bulge loop is provided with a circle of annular limit groove.

Compared with the prior art, the transmission worm has the advantages of compact structure, high integration degree, convenience in braking, high assembly precision, high structural strength, high transmission efficiency, good working stability and long service life.

Drawings

Fig. 1 is a schematic structural view of the present drive worm in embodiment 1.

Fig. 2 is a schematic structural view of the present drive worm in embodiment 2.

In the figure, 1, a body; 2. a transmission gear; 3. a guide tooth; 4. a limit convex ring; 5. an external spline; 6. a spring; 7. a rubber pad; 8. an annular groove; 9. a conical surface; 10. a limiting groove.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1, the driving worm includes a rod-shaped body 1, a spiral driving gear 2 is provided on the body 1, the body 1 has one to two circles of guiding teeth 3 with gradually increasing outer diameters and spirally connected to the driving gear 2 at both ends of the driving gear 2, the ratio of the tooth top thickness to the tooth bottom thickness of the driving gear 2 is 3:10, the tooth top thickness is gradually increased to the tooth bottom thickness, the tooth top thickness of the driving gear 2 is at least one millimeter, the tooth top thickness of the driving gear 2 in this embodiment is 1.2 millimeters, the body 1 has a radially outward protruding limiting convex ring 4 at one side of the driving gear 2, and the body 1 has a section of an external spline 5 at the other side of the driving gear 2.

The transmission worm is integrated with the transmission teeth 2, the guide teeth 3, the limiting convex ring 4 and the external spline 5, the integration degree is high, the structure is compact, the coaxiality of the integrated processing is consistent, the assembly precision is high, the limiting convex ring 4 is positioned in a limiting hole of the mounting seat and plays a limiting role, the external spline 5 is matched with the internal spline of the transmission arm, and the transmission is stable and efficient; the guide teeth 3 play a role in guiding, so that the transmission teeth 2 are assembled with the worm wheel conveniently, the tooth thickness of the transmission teeth 2 is thick, the thickness proportion is good, the structural strength of the transmission teeth 2 is high, and the transmission efficiency is high.

Further saying in detail, body 1 has the elastic construction who plays elastic support in the tip of spacing bulge loop 4 side, and elastic construction includes that body 1 offers the blind hole that has in the tip axial of spacing bulge loop 4 side in this embodiment, is equipped with spring 6 in blind hole and the coaxial setting of body 1 and the blind hole, and 6 one end of spring are contradicted in the blind hole diapire, and 6 other ends of spring are contradicted in the mount pad, and spring 6 plays the elastic support effect, avoids 1 axial float of body.

The external spline 5 radially protrudes out of the outer wall of the body 1, so that the structural strength is high, and the transmission stability is good; the external spline 5 is provided with two annular grooves 8 which are axially and uniformly distributed, the arrangement of the annular grooves 8 enables the assembly torque to be small, the press fitting process of the external spline 5 is stable, the assembly matching performance is good, and the stability is high.

The inner of spacing bulge loop 4 passes through conical surface 9 and passes through to body 1 outer wall, and the outer end of spacing bulge loop 4 has round annular spacing groove 10, and stress concentration is avoided to conical surface 9, and spacing groove 10 supplies the jump ring to inlay to establish in order to play axial limiting displacement, improves the structure steadiness.

Example 2

As shown in fig. 2, the structure and principle of the present embodiment are substantially the same as those of embodiment 1, and there is a difference that in the present embodiment, the elastic structure includes a rubber pad 7 adhered to the end of the body 1 on the side of the limit convex ring 4, and the rubber pad 7 is located between the mounting seat and the end of the body 1, and plays a role of elastic support, so as to prevent the body 1 from moving axially.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a transmission worm, is including being shaft-like body (1), body (1) on have and be spiral helicine driving gear (2), its characterized in that, body (1) all have one to two rings of external diameters increase gradually and spiral meet in guide tooth (3) of driving gear (2) at the both ends of driving gear (2), the tooth top thickness of driving gear (2) and tooth root thickness ratio be 3:10 and tooth top thickness gradually increase to tooth root thickness, the tooth top thickness of driving gear (2) be one millimeter at least, body (1) have spacing bulge loop (4) of radial evagination in one side of driving gear (2), body (1) have one section external splines (5) in the opposite side of driving gear (2).

2. A drive worm according to claim 1, characterised in that the body (1) has a resilient structure at the end on the side of the stop collar (4) for resilient support.

3. The drive worm according to claim 2, characterised in that the resilient structure comprises a blind bore axially formed in the body (1) at the end on the side of the stop collar (4), the blind bore being arranged coaxially with the body (1) and having a spring (6) disposed therein.

4. A drive worm according to claim 3, characterised in that the resilient structure comprises a rubber pad (7) bonded to the body (1) at the end on the side of the stop collar (4).

5. A drive worm according to claim 4, characterised in that the external splines (5) protrude radially from the outer wall of the body (1).

6. A drive worm according to claim 5, characterised in that the external spline (5) has a number of axially equispaced annular grooves (8).

7. The drive worm according to claim 6, characterized in that the inner end of the limit protruding ring (4) is transited to the outer wall of the body (1) through the conical surface (9), and the outer end of the limit protruding ring (4) is provided with a ring-shaped limit groove (10).