CN217422041U

CN217422041U - Worm gear and worm speed reducing mechanism suitable for DP-EPS

Info

Publication number: CN217422041U
Application number: CN202220264947.3U
Authority: CN
Inventors: 邓尼丰
Original assignee: Hubei Henglong Kaiwanbi Electric Steering System Co ltd
Current assignee: Hubei Henglong Kaiwanbi Electric Steering System Co ltd
Priority date: 2022-02-09
Filing date: 2022-02-09
Publication date: 2022-09-13
Anticipated expiration: 2032-02-09

Abstract

The utility model discloses a worm gear speed reduction mechanism suitable for DP-EPS relates to car power assisted steering system technical field, including clearance adjustable mechanism, worm, second bearing, lock nut, reduction gear casing, worm wheel, third bearing, hole retaining ring, helping hand gear shaft, worm wheel iron core and retaining ring, the one end of worm disposes clearance adjustable mechanism, the other end joint of worm has the second bearing, the one end of second bearing is equipped with lock nut, the outside of clearance adjustable mechanism is equipped with reduction gear casing, the inboard middle part of reduction gear casing is equipped with the helping hand gear shaft. The utility model discloses beneficial effect: the worm gear and the worm are in an oblique crossing structure, so that the DP-EPS is compact in overall structure, small in occupied space, large in DP-EPS power-assisted output due to the fact that the transmission ratio is 22:1, wide in application range, lower in cost compared with a conventional worm gear due to the fact that the worm gear and an iron core are subjected to gear hobbing after injection molding, simple to machine due to the fact that the worm gear is straight, and the service life is prolonged due to the fact that a gap adjustable mechanism is adopted.

Description

Worm gear and worm speed reducing mechanism suitable for DP-EPS

Technical Field

The utility model relates to a car power assisted steering system technical field specifically is a worm gear reduction gears suitable for DP-EPS.

Background

In an automobile electric power steering system, a DP-EPS reducing mechanism adopts a worm gear and worm structure, the worm gear is made of nylon, the worm is made of carbon structural steel, at present, domestic automobile models are gradually transited from small-sized automobiles to medium-sized and large-sized automobiles, the output power of the steering system is required to meet the increasing load requirement, the DP-EPS double-pinion power steering system has the advantages that the input shaft side bears hand force, the power shaft side bears 90% of power output, the worm gear and worm reducing mechanism on the power shaft side is required to meet the high-load power output and the strength and rigidity requirements, the large-transmission-ratio worm gear reducing mechanism is very necessary, so the large-transmission-ratio worm gear and worm reducing mechanism is designed at present, a worm gear is formed after nylon injection molding, the worm is rolled and is rolled at high frequency after the worm is rolled, so that the power output of the worm gear and worm reducing mechanism is ensured, and the worm gear is arranged in an oblique crossing manner, the occupied space is smaller, the installation flexibility is improved, and the application range is widened.

The conventional worm and gear speed reducing mechanism usually adopts a cross orthogonal mode, a worm wheel and an iron core are combined to form rear rolling inclined teeth, the rear high frequency of the worm gear hobbing is realized by fixing the rear rolling inclined teeth on a speed reducer shell, and the transmission ratio of the conventional worm and gear speed reducing mechanism is smaller than 21: 1, probably can't satisfy helping hand output requirement, the worm gear is the cross orthogonal mode simultaneously, and occupation space is big, is unfavorable for the space arrangement on the whole car.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims at providing a worm gear reduction gears suitable for DP-EPS to solve worm gear reduction gears, adopt the cross quadrature mode usually, roll the skewed tooth after worm wheel and iron core combine, high frequency behind the worm gear hobbing, through fixing the helping hand output of realizing on reduction gear casing, conventional worm gear reduction gears drive ratio is less than 21: 1, probably can't satisfy helping hand output requirement, the worm gear is the cross orthogonal mode simultaneously, and occupation space is big, is unfavorable for the technical problem of space arrangement on the whole car.

In order to achieve the above object, the utility model provides a following technical scheme: a worm and gear speed reducing mechanism suitable for DP-EPS comprises a gap adjustable mechanism, a worm, a second bearing, a locking nut, a speed reducer shell, a worm wheel, a third bearing, a hole retainer ring, a power-assisted gear shaft, a worm wheel iron core and a retainer ring, wherein the gap adjustable mechanism is arranged at one end of the worm, the second bearing is connected to the other end of the worm in a clamped manner, the locking nut is arranged at one end of the second bearing, the speed reducer shell is arranged on the outer side of the gap adjustable mechanism, the power-assisted gear shaft is arranged in the middle of the inner side of the speed reducer shell, the worm wheel iron core is arranged at the top of the outer side of the power-assisted gear shaft, the worm wheel is arranged on the outer side of the worm wheel iron core, the third bearing is arranged at the bottom end of the third bearing, the worm is fixed on an inclined hole of the speed reducer shell through the gap adjustable mechanism, the worm wheel is connected with the worm wheel iron core in an injection molding manner and rolls straight teeth, the worm wheel and the power-assisted gear shaft are fixed on the speed reducer shell through a third bearing after being pressed and mounted, and the inner ring of the third bearing is fixed on the power-assisted gear shaft through a check ring.

By adopting the technical scheme, the worm gear and the worm are in an oblique crossing structure, so that the DP-EPS is compact in overall structure and small in occupied space, the DP-EPS has large power-assisted output and wide application range due to the transmission ratio of 22:1, the cost is lower than that of a conventional worm gear due to the fact that the worm gear and the iron core are subjected to gear hobbing after injection molding, the worm gear is straight, the processing is simple, and the application life is prolonged due to the adoption of a clearance adjustable mechanism.

The utility model discloses further set up to, clearance adjustable mechanism includes fixed bolster, movable support, spring and first bearing, be provided with guide slot and buckle on the fixed bolster, the movable support tip is provided with the buckle groove, the bottom of movable support is provided with the guide way, the upper portion of movable support is the ring channel, the spring is fixed in movable support bottom guide way, first bearing is fixed in movable support upper portion ring channel.

By adopting the technical scheme and adopting the clearance adjustable mechanism, the meshing performance of the worm is good, and the service life is prolonged.

The utility model discloses further set up to, the fixed bolster passes through buckle and buckle groove joint with the movable support, the size of buckle and the big or small phase-match in buckle groove.

Through adopting above-mentioned technical scheme, be convenient for be in the same place fixed bolster and movable support installation clamp, it is comparatively convenient during the installation, the steadiness of installation clamp is better.

The utility model discloses further set up to, the worm wheel iron core outer lane is provided with the profile of tooth, helping hand gear shaft worm wheel position is outer spline structure.

By adopting the technical scheme, the worm wheel and the iron core are molded by injection and then are subjected to gear hobbing, the cost is lower than that of a conventional worm wheel, the worm wheel is straight, and the processing is simple.

The utility model discloses further set up to, the inboard size of second bearing and the big or small phase-match of the outside one end of worm, lock nut's quantity has a set ofly, lock nut and retarder casing inclined hole upper end phase-match.

By adopting the technical scheme, the worm gear is of an oblique structure, so that the DP-EPS is compact in overall structure and small in occupied space.

The utility model discloses further set up to, the size phase-match on inboard size of worm wheel iron core and helping hand gear shaft outside top, the size phase-match on inboard size of third bearing and helping hand gear shaft outside middle part top, the third bearing outer lane passes through the hole to be fixed on reduction gear casing with the retaining ring.

Through adopting above-mentioned technical scheme, it is comparatively convenient when worm wheel iron core and helping hand gear shaft installation, and the steadiness of installation is better.

To sum up, the utility model discloses mainly have following beneficial effect: the worm gear and the worm are in an oblique crossing structure, so that the DP-EPS is compact in overall structure, small in occupied space, large in DP-EPS power-assisted output due to the fact that the transmission ratio is 22:1, wide in application range, lower in cost compared with a conventional worm gear due to the fact that the worm gear and an iron core are subjected to gear hobbing after injection molding, simple to machine due to the fact that the worm gear is straight, and the service life is prolonged due to the fact that a gap adjustable mechanism is adopted.

Drawings

FIG. 1 is a sectional view of a partial front view of a worm gear of the present invention;

FIG. 2 is a sectional view of a partial front view of the worm of the present invention;

fig. 3 is a sectional view of the bottom view of the gap adjustment mechanism of the present invention;

fig. 4 is a cross-sectional view of a side view of the gap adjusting mechanism of the present invention.

In the figure: 1. a gap adjustable mechanism; 1.1, fixing a bracket; 1.2, a movable bracket; 1.3, a spring; 1.4, a first bearing; 2. a worm; 3. a second bearing; 4. locking the nut; 5. a reducer housing; 6. a worm gear; 7. a third bearing; 8. a retainer ring for a bore; 9. a booster gear shaft; 10. a worm gear core; 11. and a retainer ring.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Next, an embodiment of the present invention will be described with reference to the overall structure thereof.

A worm and gear speed reducing mechanism suitable for DP-EPS is disclosed, as shown in figures 1-4, comprising a clearance adjustable mechanism 1, a worm 2, a second bearing 3, a lock nut 4, a reducer casing 5, a worm wheel 6, a third bearing 7, a hole retainer ring 8, a booster gear shaft 9, a worm gear iron core 10 and a retainer ring 11, wherein one end of the worm 2 is provided with the clearance adjustable mechanism 1, the other end of the outer side of the worm 2 is connected with the second bearing 3 in a clamping manner, one end of the second bearing 3 is provided with the lock nut 4, the outer side of the clearance adjustable mechanism 1 is provided with the reducer casing 5, one side of the middle part of the inner side of the reducer casing 5 is provided with the booster gear shaft 9, the top end of the outer side of the booster gear shaft 9 is provided with the worm gear iron core 10, the outer side of the worm gear iron core 10 is provided with the worm wheel 6, the bottom end of the worm gear iron core 10 is provided with the third bearing 7, the bottom end of the third bearing 7 is provided with the hole retainer ring 8, the worm 2 is fixed on an inclined hole of the reducer casing 5 through the clearance adjustable mechanism 1, the worm wheel 6 and the worm wheel iron core 10 are connected through injection molding and then roll straight teeth, the worm wheel 6 and the power-assisted gear shaft 9 are fixed on the reducer shell 5 through the third bearing 7 after being pressed and installed, and the inner ring of the third bearing 7 is fixed on the power-assisted gear shaft 9 through the retainer ring 11.

Referring to fig. 1, 3 and 4, the gap adjustable mechanism 1 includes a fixed bracket 1.1, a movable bracket 1.2, a spring 1.3 and a first bearing 1.4, the fixed bracket 1.1 is provided with a guide groove and a buckle, the end of the movable bracket 1.2 is provided with a buckle groove, the bottom of the movable bracket 1.2 is provided with a guide groove, the upper portion of the movable bracket 1.2 is an annular groove, the spring 1.3 is fixed in the guide groove at the bottom of the movable bracket 1.2, and the first bearing 1.4 is fixed in the annular groove at the upper portion of the movable bracket 1.2.

Referring to fig. 1, 3 and 4, the fixed bracket 1.1 and the movable bracket 1.2 are clamped with the clamping groove through a clamp, and the size of the clamp is matched with that of the clamping groove.

Referring to fig. 2, the outer ring of the worm gear core 10 is provided with a tooth shape, and the worm gear position of the assisting gear shaft 9 is an external spline structure.

Referring to fig. 1, the size of the inner side of the second bearing 3 is matched with the size of one end of the outer side of the worm 2, and a group of locking nuts 4 are arranged and matched with the upper end of an inclined hole of a speed reducer shell.

Referring to fig. 2, the size of the inner side of the worm wheel core 10 is matched with the size of the top end of the outer side of the power assisting gear shaft 9, the size of the inner side of the third bearing 7 is matched with the size of the top end of the middle part of the outer side of the power assisting gear shaft 9, and the outer ring of the third bearing 7 is fixed on the reducer housing 5 through a retainer ring 8 for a hole.

The utility model discloses a theory of operation does: the worm gear iron core is a die forging, the outer ring is provided with a tooth profile, the tooth profile is processed by injection molding with a worm gear, the worm gear position of the power-assisted gear shaft is of an external spline structure, and the worm gear is connected with the power-assisted gear shaft through a spline and then is connected with the reducer shell through a bearing and a hole retainer ring. The worm is fixed on the reducer shell through the gap adjustable mechanism and the bearing, and the end part is provided with the gap adjustable mechanism, so that the worm has good meshing performance and long service life. The novel worm and gear speed reducing mechanism of the DP-EPS is adopted, the power output of a power-assisted steering system is improved, the application range is wide, and meanwhile, the worm and gear are of an oblique structure, so that the DP-EPS is compact in overall structure, small in occupied space and particularly suitable for occasions with high loads and compact spaces.

Although embodiments of the present invention have been shown and described, it is intended that the present embodiments be illustrative only and not limiting to the invention, and that the particular features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples, and that modifications, substitutions, variations, and the like, which are not inventive in light of the above teachings, may be made to the embodiments by those skilled in the art without departing from the principles and spirit of the present invention, but are to be construed as broadly as the following claims.

Claims

1. The utility model provides a worm gear reduction gears suitable for DP-EPS, includes clearance adjustable mechanism (1), worm (2), second bearing (3), lock nut (4), reduction gear casing (5), worm wheel (6), third bearing (7), hole retaining ring (8), helping hand gear shaft (9), worm wheel iron core (10) and retaining ring (11), its characterized in that: the one end of worm (2) disposes clearance adjustable mechanism (1), the other end joint of worm (2) has second bearing (3), the one end of second bearing (3) is equipped with lock nut (4), the outside of clearance adjustable mechanism (1) is equipped with reducer casing (5), reducer casing (5) inboard middle part is equipped with helping hand gear shaft (9), the top in helping hand gear shaft (9) outside is equipped with worm wheel core (10), the outside of worm wheel core (10) is equipped with worm wheel (6), the bottom of worm wheel core (10) is equipped with third bearing (7), the bottom of third bearing (7) is equipped with hole retaining ring (8), worm (2) are fixed on reducer casing (5) inclined hole through clearance adjustable mechanism (1), worm wheel (6) and worm wheel core (10) are moulded plastics and are connected back and are rolled straight tooth, the worm wheel (6) and the power-assisted gear shaft (9) are fixed on the reducer shell (5) through a third bearing (7) after being pressed and mounted, and the inner ring of the third bearing (7) is fixed on the power-assisted gear shaft (9) through a retainer ring (11).

2. The worm gear and worm reduction mechanism suitable for the DP-EPS as claimed in claim 1, wherein: the adjustable gap mechanism (1) comprises a fixed support (1.1), a movable support (1.2), a spring (1.3) and a first bearing (1.4), wherein a guide groove and a buckle are arranged on the fixed support (1.1), a buckle groove is formed in the end part of the movable support (1.2), a guide groove is formed in the bottom of the movable support (1.2), the upper part of the movable support (1.2) is an annular groove, the spring (1.3) is fixed in the guide groove in the bottom of the movable support (1.2), and the first bearing (1.4) is fixed in the annular groove in the upper part of the movable support (1.2).

3. The worm gear reduction mechanism suitable for the DP-EPS according to claim 2, characterized in that: the fixing support (1.1) is clamped with the movable support (1.2) through a buckle and a buckle groove, and the size of the buckle is matched with that of the buckle groove.

4. The worm gear and worm reduction mechanism suitable for the DP-EPS as claimed in claim 1, wherein: the outer ring of the worm gear iron core (10) is provided with a tooth shape, and the worm gear position of the power assisting gear shaft (9) is of an external spline structure.

5. The worm gear and worm reduction mechanism suitable for the DP-EPS as claimed in claim 1, wherein: and the outer ring of the third bearing (7) is fixed on the reducer shell (5) through a retainer ring (8) for a hole.

6. The worm gear and worm reduction mechanism suitable for the DP-EPS as claimed in claim 1, wherein: the inner side of the worm gear iron core (10) is matched with the top end of the outer side of the power-assisted gear shaft (9), and the inner side of the third bearing (7) is matched with the top end of the middle of the outer side of the power-assisted gear shaft (9).

7. The worm gear and worm reduction mechanism suitable for the DP-EPS as claimed in claim 1, wherein: the inner side of the second bearing (3) is matched with one end of the outer side of the worm (2), the number of the locking nuts (4) is one group, and the locking nuts (4) are matched with the upper end of an inclined hole of the speed reducer shell (5).