CN216269500U - Electric power steering system - Google Patents

Abstract

The utility model discloses an electric power steering system which comprises a shell, wherein a worm wheel and a worm which are mutually jointed are accommodated in the shell, the worm comprises a first end and a second end, the first end is connected with a driving mechanism, a buffer pad is fixedly arranged between the driving mechanism and the first end, a four-claw connector is sleeved on the periphery of the head of the first end, claw parts of the four-claw connector are connected with the buffer pad in a nested manner, and a circle of protection ring is arranged between the head and the four-claw connector in an interference fit manner. This scheme is in the cover is equipped with a protective ring between the head of worm first end and the four paws connector, the protective ring is tolerance ring, plays the cushioning effect in transmission process, simultaneously, when the cooperation card is dead, only needs the replacement protective ring, need not to replace the worm wheel, has saved processing cost and material cost, has guaranteed the tight fitting nature between the individual part simultaneously.

Description

Electric power steering system

Technical Field

The utility model relates to the technical field of automobile steering, in particular to an electric power steering system.

Background

The electric power steering column power-assisted core mechanism is the matching of a worm gear and a worm, and in order to ensure the transmission strength during the design of the worm and the worm gear, the method of reducing the tooth thickness of the EPS worm and increasing the tooth thickness of the nylon worm gear is usually adopted. Among the current assist drive device, cushion through the blotter between worm wheel and the actuating mechanism, but the worm wheel is connected with the direct interference fit of connecting piece between the connection blotter, along with the promotion of transmission intensity, the long-time high strength transmission between worm wheel and the worm is inevitable to cause the condition that the part card dies or wearing and tearing, but the worm gear material is with the costly height of processing, gear cutting machining efficiency is low, and carry out the flank of tooth with the manual work and repair and waste time and energy, influence machining efficiency, for saving time cost, prevent that the part that pairs with the worm gear material is damaged when the card dies, select the nylon worm wheel usually, when the part takes place the card die situation, replace damaged worm wheel, but this kind of mode still need consume great material and processing cost.

SUMMERY OF THE UTILITY MODEL

The novel purpose is to solve the problems in the prior art and provide an electric power steering system.

The purpose of the utility model is realized by the following technical scheme:

electric power assisted steering system, which comprises a housin, the worm wheel and the worm that have the interengagement are held in the casing, the worm includes first end and second end, first end is connected with actuating mechanism, actuating mechanism with the fixed blotter that is provided with between the first end, the head periphery cover of first end is equipped with four claw connectors, the claw of four claw connectors with blotter nested connection, interference fit has round protection ring between head and the four claw connector.

Preferably, the periphery of the buffer pad is provided with eight grooves at equal intervals, and the claw parts of the four-claw connecting shaft are nested in four grooves at equal intervals.

Preferably, the bottom of the driving mechanism is provided with connecting pieces matched with the four-claw connectors in shape, and the connecting pieces are nested in the other four grooves of the cushion pad at equal intervals.

Preferably, the inner wall of the four-claw connector is uniformly provided with concave grains, and the outer surface of the protection ring is provided with a convex block matched with the concave grains.

Preferably, the guard ring is a tolerance ring.

Preferably, the first bearing and the second bearing are respectively arranged outside the first end and the second end, the first bearing is in interference fit with the first end, and the second bearing is in interference fit with the second end.

Preferably, the worm is coaxially connected with the driving mechanism, the cushion pad, the four-jaw connector, the first bearing and the second bearing.

Preferably, the worm wheel is a nylon worm wheel.

The technical scheme of the utility model has the following beneficial effects:

1. in the scheme, a protection ring is sleeved between the head of the first end of the worm and the four-claw connector, the protection ring is a tolerance ring, the protection ring and the four-claw connector are matched with concave patterns on the inner wall of the four-claw connector through convex blocks arranged outside the protection ring, the tight fit connection of the protection ring and the four-claw connector is ensured, and a buffer effect is achieved in the transmission process;

2. in this scheme, utilize recess and four claw connectors on the blotter to be connected with the connecting piece that actuating mechanism bottom set up, accomplish the assembly of actuating mechanism and worm, guaranteed the fastness of each parts assembly, saved the assembly space simultaneously.

Drawings

FIG. 1: is an exploded view of the electric power steering system of the present invention;

FIG. 2: is a perspective view of the electric power steering system of the present invention;

FIG. 3: is a cross-sectional view taken along the line A-A in FIG. 2;

FIG. 4: is an enlarged view of portion B of fig. 3;

FIG. 5: is a cross-sectional view in the direction C-C in fig. 3.

Detailed Description

Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. The embodiments are merely exemplary for applying the technical solutions of the present invention, and any technical solution formed by replacing or converting the equivalent thereof falls within the scope of the present invention claimed.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

An electric power steering system according to the present invention will be described with reference to the accompanying drawings:

as shown in fig. 1, the electric power steering system comprises a housing 1, a worm wheel 2 and a worm 3 which are mutually jointed are accommodated in the housing 1, a tooth surface matched with a surface thread of the worm 3 is arranged on the periphery of the worm wheel 2, transmission matching between the worm 3 and the worm wheel 2 is ensured, the worm 3 comprises a first end and a second end, the first end is connected with a driving mechanism 4, the driving mechanism 4 is a motor, a cushion pad 5 is fixedly arranged between the driving mechanism 4 and the first end, a four-claw connector 6 is sleeved on the periphery of a head 31 of the first end, and claw parts of the four-claw connector 6 are connected with the cushion pad 5 in a nested manner.

Specifically, eight convex teeth are arranged on the periphery of the cushion pad 5 at equal angular intervals, a groove is arranged between every two adjacent convex teeth, the width of the groove is matched with the width of each claw block of the claw part of the four-claw connector 6, so that the claw parts of the four-claw connector 6 are embedded in four grooves on the periphery of the cushion pad 5 at equal intervals and in a close fit manner, wherein the interval distance between every two adjacent claw blocks on the claw part of the four-claw connector 6 is equal to the distance between one claw block and two convex teeth, and after the claw part of the four-claw connector 6 is embedded in the cushion pad 5, two convex teeth and a hollow groove are arranged between every two adjacent claw blocks; the bottom of actuating mechanism 4 be provided with 6 shape assorted connecting pieces of four-jaw connector, the connecting piece certainly the top equidistance of blotter 5 and interval ground are nested in four other recesses of blotter 5 make four-jaw connector 6 with the connecting piece is fixed with nested mode respectively the both ends of blotter 5, and pass through blotter 5 is connected actuating mechanism 4 and worm 3.

As shown in fig. 1 and 2, the bottom of the four-jaw connector 6 is sleeved on the periphery of the head 31 of the first end of the worm 3, a circle of protection ring 7 is arranged between the head 31 and the four-jaw connector 6 in an interference fit manner, the protection ring 7 is a tolerance ring, in the transmission process, the driving mechanism 4 transmits power to the four-jaw connector 6 through the buffer pad 5, the power is transmitted to the worm 3 after passing through the protection ring 7, the worm 3 drives the worm wheel 2 to move while moving, the protection ring 7 plays a role in buffering in the whole transmission process, meanwhile, the protection ring 7 is directly contacted with the four-jaw connector 6 and is positioned at the front end of the power transmission of the worm 3 and the worm wheel 2, when the situation of fit locking occurs, because the transmission force intensity received by the protection ring 7 is high, the protection ring is damaged earlier than the worm wheel 2, the protection function can be played to the worm wheel 2 and the worm 3, and the function of preventing the damage of the tooth surface between the worm wheel 2 and the worm 3 is played, specifically, protection ring 7 with 31 interference fit of head, the inner wall of four-jaw connector 6 evenly is provided with the dimpled grain, the surface of protection ring 7 be provided with dimpled grain matched with lug makes protection ring 7 is connected with the 6 tight fits of four-jaw connector, increase protection ring 7 with the compactness of connecting between the four-jaw connector 6 avoids having the clearance between protection ring 7 and the four-jaw connector 6, causes not hard up, influences transmission strength, prevents simultaneously that the vibration from leading to the part to damage.

Specifically, the outside of first end and second end is provided with first bearing and second bearing respectively, first bearing with first end interference fit, the second bearing with second end interference fit, worm 3 is connected with actuating mechanism 4, blotter 5, four claw connectors 6, first bearing, second bearing coaxial.

Specifically, the worm wheel 2 is a nylon worm wheel, and the worm 3 is a metal worm.

The utility model has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the utility model.

Claims (8)

1. Electric power steering system, including casing (1), the worm wheel (2) and worm (3) that have contained mutual joint in casing (1), its characterized in that: worm (3) include first end and second end, first end is connected with actuating mechanism (4), actuating mechanism (4) with fixed blotter (5) of being provided with between the first end, head (31) periphery cover of first end is equipped with four claw connectors (6), the claw of four claw connectors (6) with blotter (5) nested connection, interference fit has round protection ring (7) between head (31) and four claw connectors (6).

2. The electric power steering system according to claim 1, characterized in that: eight grooves are equidistantly arranged on the periphery of the cushion pad (5) at intervals, and the claw parts of the four-claw connector (6) are equidistantly nested in four of the grooves at intervals.

3. The electric power steering system according to claim 2, characterized in that: the bottom of the driving mechanism (4) is provided with connecting pieces matched with the four-claw connectors (6) in shape, and the connecting pieces are nested in the other four grooves of the cushion pad (5) at equal intervals.

4. The electric power steering system according to claim 1, characterized in that: the inner wall of the four-claw connector (6) is uniformly provided with concave grains, and the outer surface of the protection ring (7) is provided with a convex block matched with the concave grains.

5. The electric power steering system according to claim 1, characterized in that: the protection ring (7) is a tolerance ring.

6. The electric power steering system according to claim 1, characterized in that: the outside of first end and second end is provided with first bearing and second bearing respectively, first bearing with first end interference fit, the second bearing with second end interference fit.

7. The electric power steering system according to claim 6, characterized in that: the worm (3) is connected with the driving mechanism (4), the cushion pad (5), the four-jaw connector (6), the first bearing and the second bearing in a coaxial mode.

8. The electric power steering system according to claim 1, characterized in that: the worm wheel (2) is a nylon worm wheel.

Images