CN215928335U - Speed reducer with adjustable worm and gear clearance - Google Patents

Abstract

The utility model discloses a speed reducer with an adjustable worm and gear clearance, which comprises a shell, a worm gear arranged in the shell and a worm meshed with the worm gear, wherein a bearing is arranged at the end part of the worm, a mounting hole is arranged at the position, corresponding to the bearing at the end part of the worm, on the shell, a clearance adjusting mechanism is arranged in the mounting hole, the clearance adjusting mechanism comprises a mandril corresponding to the bearing, a mandril sleeve sleeved on the mandril, a plug screw tightly matched with the inner side wall of the mandril sleeve and an elastic element positioned between the mandril and the plug screw, the mandril and the elastic element are sequentially pressed in the mandril sleeve by the plug screw, and one end of the mandril, facing the bearing, extends out of the mandril sleeve and is matched with the bearing. The utility model adopts the speed reducer with the adjustable worm and gear clearance, can effectively control the meshing clearance of the worm and gear, reduces abnormal sound generated when the worm and gear work, and has simple structure, convenient assembly and low cost.

Description

Speed reducer with adjustable worm and gear clearance

Technical Field

The utility model relates to a speed reducer, in particular to a speed reducer with an adjustable worm gear and worm clearance.

Background

In the development of the whole vehicle, a worm and gear power assisting structure in an electric steering system is very commonly used, along with the higher and higher performance requirement of the whole vehicle, the performance requirement on the worm and gear power assisting structure is higher and higher, the friction torque of the worm and gear is required to be as small as possible, and no abnormal sound is generated in the using process.

To reduce the friction torque, the meshing clearance of the worm gear and the worm can be increased, but the increase of the meshing clearance is easy to generate abnormal noise, so the existing method is to arrange clearance adjusting mechanisms at two ends of the worm for controlling the clearance of the worm gear and the worm.

For example, chinese patent publication No. CN203784261U, entitled "worm and gear clearance adjustment mechanism and worm and gear mechanism", includes an actuating element and a positioning element actuated by the actuating element, where the actuating element and the positioning element are both disposed on a casing, and an actuating direction of the actuating element forms an angle with an adjusting direction of the positioning element, and the adjusting direction is an axial direction of the worm and gear.

The disadvantages of the prior patents are: the gap adjusting mechanism has a complex structure, increases the assembly difficulty between the worm and the worm gear and the shell, and improves the processing cost; the meshing clearance of the worm gear and the worm is unstable, and the risk of generating abnormal sound is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that the meshing clearance of a worm gear is unstable and abnormal sound is easy to generate, and provides a speed reducer with an adjustable worm gear clearance, which can effectively control the meshing clearance of the worm gear and the worm

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a worm gear clearance adjustable speed reducer, includes the casing, sets up the worm wheel in the casing and with worm wheel engaged with worm, the tip of worm is equipped with the bearing, the position that corresponds worm tip bearing on the casing is equipped with the mounting hole, be equipped with clearance adjustment mechanism in the mounting hole, clearance adjustment mechanism includes that ejector pin, the cover that corresponds with the bearing establishes ejector pin cover on the ejector pin, with the plug screw of ejector pin cover inside wall tight fit and be located the elastic element between ejector pin and the plug screw, the plug screw compresses tightly ejector pin and elastic element in proper order in the ejector pin cover, and the ejector pin is stretched out ejector pin cover and bearing cooperation towards the one end of bearing.

During assembly, the ejector rod is arranged in the ejector rod sleeve in a penetrating mode, one end of the ejector rod extends out of the ejector rod sleeve, the elastic element is arranged in the ejector rod sleeve, fastening sealant is coated on the plug screw and is screwed into the ejector rod sleeve, and assembly of the gap adjusting mechanism is completed. The shell is provided with a mounting hole, the mounting hole corresponds to the position of the bearing on the screw rod, the gap adjusting mechanism is arranged in the mounting hole, and one end of the ejector rod, which extends out of the ejector rod sleeve, is in contact with the bearing.

After the clearance adjusting mechanism is assembled, the elastic element tightly pushes the ejector rod, and the ejector rod always compresses the bearing under the action of the elastic element to ensure that the worm and the worm are tightly matched. The ejector rod moves in the ejector rod sleeve along the bearing in the radial direction, and the clearance between the worm and the worm gear is automatically adjusted, so that the meshing clearance between the worm and the worm gear is stable, and abnormal sound is not easy to generate. The elastic element has elasticity, and under the tight state in ejector pin top, can effective control turbine worm meshing clearance.

The ejector rod and the elastic element are sequentially compressed in the ejector rod sleeve by the screw plug, the pretightening force of the ejector rod on the bearing is adjusted by adjusting the positions between the screw plug and the ejector rod sleeve and between the ejector rod sleeve and the mounting hole, and the gap adjusting mechanism in the patent can be suitable for gap adjustment of speed reducers of different worm gears.

Preferably, one end of the ejector rod facing the outer side of the shell is provided with a mounting groove, and one end of the elastic element facing the bearing extends into the mounting groove. The mounting groove is used for positioning the elastic element, so that the elastic element is stable in structure in the telescopic process.

Preferably, a limiting boss is arranged on the inner side wall of one end, facing the bearing, of the ejector rod sleeve, a shaft shoulder is arranged on the outer side wall, located in the ejector rod sleeve, of the ejector rod, and the limiting boss is matched with the shaft shoulder. The part of the ejector rod facing the outer side of the shell is limited in the ejector rod sleeve and moves along the radial direction of the bearing.

Preferably, the ejector rod sleeve is matched with the mounting hole of the shell through screw thread screwing. After the clearance adjusting mechanism is assembled, the outside of the ejector rod sleeve is coated with a sealant and screwed in the mounting hole, and the position between the ejector rod sleeve and the mounting hole is adjusted to adjust the pre-tightening force of the ejector rod on the bearing.

Preferably, the elastic element is a compression spring. The spring cost is low, and the influence of the spring load on the friction rotation torque of the worm and gear is small.

Preferably, the screw plug adopts an inner hexagonal locking screw plug. The inner hexagonal locking plug screw is screwed into the ejector rod sleeve, so that the surface smoothness of the surface of the speed reducer shell is ensured.

Preferably, one end of the ejector rod facing the bearing is provided with a wear-resistant layer. The contact area between the ejector rod and the bearing is small, so the utility model has the following beneficial effects: (1) the meshing clearance of the worm and the worm can be effectively controlled, and abnormal sound generated when the worm and the worm work is reduced; (2) the clearance adjusting mechanism has simple structure, convenient assembly and low cost.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Fig. 2 is a schematic view of a structure of the backlash adjustment mechanism in fig. 1.

Fig. 3 is an exploded view of the lash adjustment mechanism of fig. 1.

As shown in the figure: the device comprises a shell 1, a worm 2, a bearing 3, a mounting hole 4, a mandril 5, a mounting groove 5.1, a shaft shoulder 5.2, a mandril sleeve 6, a limiting boss 6.1, a plug screw 7 and an elastic element 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention is further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1, 2, and 3, a worm gear 2 gap-adjustable speed reducer includes a housing 1, a worm wheel disposed in the housing 1, and a worm 2 engaged with the worm wheel, a bearing 3 is disposed at an end of the worm 2, a mounting hole 4 is disposed on the housing 1 corresponding to the bearing 3 at the end of the worm 2, a gap adjusting mechanism is disposed in the mounting hole 4, the gap adjusting mechanism includes a push rod 5 corresponding to the bearing 3, a push rod sleeve 6 sleeved on the push rod 5, a plug screw 7 tightly fitted to an inner side wall of the push rod sleeve 6, and an elastic element 8 located between the push rod 5 and the plug screw 7, the push rod 5 and the elastic element 8 are sequentially pressed in the push rod sleeve 6 by the plug screw 7, and one end of the push rod 5 facing the bearing 3 extends out of the push rod sleeve 6 to be fitted with the bearing 3.

During assembly, as shown in fig. 3, the ejector rod 5 is inserted into the ejector rod sleeve 6, one end of the ejector rod 5 extends out of the ejector rod sleeve 6, the elastic element 8 is installed into the ejector rod sleeve 6, and the screw plug 7 is coated with fastening sealant and screwed into the ejector rod sleeve 6 to complete assembly of the gap adjusting mechanism. The shell 1 is provided with a mounting hole 4, the mounting hole 4 corresponds to the position of the bearing 3 on the screw rod, the clearance adjusting mechanism is arranged in the mounting hole 4, and one end of the ejector rod 5 extending out of the ejector rod sleeve 6 is contacted with the bearing 3.

As shown in fig. 1, after the assembly of the clearance adjustment mechanism is completed, the elastic element 8 tightly pushes the ejector rod 5, and the ejector rod 5 always presses the bearing 3 under the action of the elastic element 8, so as to ensure that the worm gear 2 is tightly matched. The ejector rod 5 moves along the radial direction of the bearing 3 in the ejector rod sleeve 6, and the gap between the worm and gear 2 is automatically adjusted, so that the meshing gap of the worm and gear 2 is stable, and abnormal sound is not easy to generate. The mandril 5 is not contacted with the screw plug 7. The elastic element 8 has elasticity, and can effectively control the meshing clearance of the worm gear 2 in the state that the ejector rod 5 is tightly pushed. The ejector rod sleeve 6 has guidance.

As shown in fig. 2, the push rod 5 and the elastic element 8 are sequentially pressed in the push rod sleeve 6 by the screw plug 7, and the pretightening force of the push rod 5 on the bearing 3 is adjusted by adjusting the positions between the screw plug 7 and the push rod sleeve 6 and between the push rod sleeve 6 and the mounting hole 4, so that the gap adjusting mechanism in the patent can be applied to gap adjustment of speed reducers of different worm gears 2.

In the above embodiment, the ejector rod 5 radially moves along the bearing 3 in the ejector rod sleeve 6 under the effect of the elastic element 8 to control the meshing gap of the turbine worm 2, the ejector rod 5 and the elastic element 8 are in a tightly-ejecting state, the ejector rod 5 tightly ejects the bearing 3 and can adjust the gap, the problem that the gap adjusting mechanism is complex in structure, the assembly difficulty between the turbine worm 2 and the shell 1 is increased, the processing cost is increased, the meshing gap of the turbine worm 2 is unstable, and the risk of abnormal sound is high is solved.

As shown in fig. 2, a mounting groove 5.1 is provided on one end of the push rod 5 facing the outer side of the housing 1, and one end of the elastic element 8 facing the bearing 3 extends into the mounting groove 5.1. The mounting groove 5.1 is used for positioning the elastic element 8, so that the elastic element 8 is structurally stable during the telescoping process.

As shown in fig. 2, a limiting boss 6.1 is arranged on the inner side wall of one end of the ejector rod sleeve 6 facing the bearing 3, a shaft shoulder 5.2 is arranged on the outer side wall of the ejector rod 5 located in the ejector rod sleeve 6, and the limiting boss 6.1 is matched with the shaft shoulder 5.2. The part of the mandril 5 facing the outer side of the shell is limited in the mandril sleeve 6 and moves along the radial direction of the bearing 3.

As shown in fig. 1 and 2, the ejector sleeve 6 is screwed into the mounting hole 4 of the housing 1. After the clearance adjusting mechanism is assembled, sealant is smeared on the outer side of the ejector rod sleeve 6 and screwed in the mounting hole 4, and the position between the ejector rod sleeve 6 and the mounting hole 4 is adjusted to adjust the pre-tightening force of the ejector rod 5 on the bearing 3.

The elastic element 8 is a compression spring. The spring cost is low, and the influence of the spring load on the friction rotation torque of the worm gear 2 is small.

As shown in fig. 1 and 2, the screw plug 7 is an inner hexagonal locking screw plug 7. The inner hexagonal locking screw plug 7 is screwed into the ejector rod sleeve 6, so that the surface smoothness of the speed reducer shell 1 is ensured. The elastic member 8 may employ a coil spring, a washer, or the like.

A plurality of gap adjusting mechanisms can be arranged on the shell 1 corresponding to the bearing 3 at the end part of the worm 2, and the structure is simple and the installation is convenient.

And one end of the mandril 5 facing the bearing 3 is provided with a wear-resistant layer. The contact area between the push rod 5 and the bearing 3 is small, and the end of the push rod 5 facing the bearing 3 is provided with a wear-resistant layer, so that the friction and the damage of the push rod 5 to the bearing 3 are small.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereby. All equivalent changes in the shape and structure of the present invention are also intended to be included within the scope of the present invention.

Claims (7)

1. The utility model provides a worm gear clearance adjustable speed reducer, includes casing (1), sets up worm wheel in the casing and worm (2) with the worm wheel meshing, the tip of worm is equipped with bearing (3), its characterized in that, the position that corresponds worm tip bearing on the casing is equipped with mounting hole (4), be equipped with clearance adjustment mechanism in the mounting hole, clearance adjustment mechanism includes ejector pin (5) that correspond with the bearing, cover establish ejector pin cover (6) on the ejector pin, plug screw (7) with ejector pin cover inside wall tight fit and be located elastic element (8) between ejector pin and the plug screw, the plug screw compresses tightly ejector pin and elastic element in proper order in the ejector pin cover, and the ejector pin is stretched out ejector pin cover and bearing cooperation towards the one end of bearing.

2. The reducer of claim 1, wherein the end of the ejector rod facing the outer side of the housing is provided with a mounting groove (5.1), and the end of the elastic element facing the bearing extends into the mounting groove.

3. The reducer according to claim 1, wherein a limiting boss (6.1) is arranged on the inner side wall of one end of the ejector rod sleeve facing the bearing, a shaft shoulder (5.2) is arranged on the outer side wall of the ejector rod in the ejector rod sleeve, and the limiting boss is matched with the shaft shoulder.

4. The speed reducer of claim 1 or 3, wherein the ejector rod sleeve is screwed with the mounting hole of the housing.

5. The reducer of claim 1, wherein the resilient element is a compression spring.

6. The reducer of claim 1, wherein the plug screw is a hexagon socket head cap screw.

7. The speed reducer of claim 1 or 2, wherein the end of the ejector rod facing the bearing is provided with a wear-resistant layer.

Images