CN216070180U - Speed reducer of electric power steering gear assembly and electric power steering gear assembly - Google Patents

Abstract

The utility model discloses a reducer of an electric power steering gear assembly and the electric power steering gear assembly, wherein the reducer of the electric power steering gear assembly comprises: the speed reducer comprises a speed reducer shell, a speed reducer shell and a control device, wherein the speed reducer shell is provided with a worm installation cavity and an installation hole communicated with the worm installation cavity; the power-assisted motor is connected with the speed reducer shell; the worm is arranged in the worm mounting cavity, one end of the worm is connected with the power assisting motor, and the other end of the worm is arranged in the mounting hole; the sealing plug is positioned on one side of the worm, which is far away from the power-assisted motor, and the sealing plug is in interference press-fit in the mounting hole so as to seal the mounting hole. According to the reducer of the electric power steering gear assembly, the sealing plug is used for interference press mounting to seal the mounting hole, and the reducer has the advantages of simple part structure, simple assembly process, low cost, simplicity in disassembly, high reliability and the like.

Description

Speed reducer of electric power steering gear assembly and electric power steering gear assembly

Technical Field

The utility model relates to the technical field of automobiles, in particular to a reducer of an electric power steering gear assembly and the electric power steering gear assembly with the reducer.

Background

In the related art, a sealing structure of a small end of a worm of a single-pinion electric power steering gear is sealed by adopting thread gluing, so that the cost is high, and the assembly process is relatively complex.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a reducer of an electric power steering gear assembly, which has the advantages of simple structure, simple assembly process and low cost.

The utility model also provides an electric power steering gear assembly with the speed reducer.

The reducer of the electric power steering assembly according to the embodiment of the present invention includes: the speed reducer comprises a speed reducer shell, a speed reducer shell and a control device, wherein the speed reducer shell is provided with a worm installation cavity and an installation hole communicated with the worm installation cavity; the power-assisted motor is connected with the speed reducer shell; the worm is arranged in the worm mounting cavity, one end of the worm is connected with the power assisting motor, and the other end of the worm is arranged in the mounting hole; the sealing plug is positioned on one side of the worm, which is far away from the power-assisted motor, and the sealing plug is in interference press-fit in the mounting hole so as to seal the mounting hole.

According to the reducer of the electric power steering gear assembly, the sealing plug is used for interference press mounting to seal the mounting hole, and the reducer has the advantages of simple part structure, simple assembly process, low cost, simplicity in disassembly, high reliability and the like.

In addition, the reducer of the electric power steering assembly according to the above embodiment of the present invention may further have the following additional technical features:

according to some embodiments of the utility model, the mounting bore comprises a first bore section and a second bore section, the second bore section having a larger bore diameter than the first bore section, the other end of the worm being mounted to the first bore section by a first bearing, the sealing plug being mounted to the second bore section.

According to some embodiments of the utility model, one of the inner circumferential surface of the mounting hole and the outer circumferential surface of the sealing plug is provided with a stopper groove, and the other is provided with a stopper projection extending into the stopper groove.

According to some embodiments of the present invention, the sealing plug includes a metal substrate and a flexible sleeve body covering the metal substrate, and the flexible sleeve body is in sealing fit with the wall of the mounting hole.

According to some embodiments of the present invention, the reducer housing further has a worm wheel mounting cavity, and the reducer further includes a worm wheel mounted in the worm wheel mounting cavity and engaged with the worm, wherein an axial direction of the worm wheel is perpendicular to an axial direction of the worm.

According to some embodiments of the utility model, the retarder further comprises: the gear shaft is arranged in the gear installation cavity through a second bearing, and the worm gear is sleeved on the gear shaft; the locking piece is sleeved on the gear shaft and abutted to the end face, far away from the worm wheel, of the second bearing.

According to some embodiments of the utility model, the outer circumferential surface of the gear shaft is provided with a positioning protrusion, the second bearing is a ball bearing and comprises a bearing inner ring and a bearing outer ring sleeved on the bearing inner ring, and the positioning protrusion and the locking member respectively abut against two axial ends of the bearing inner ring.

According to some embodiments of the present invention, the locker is screw-coupled with the gear shaft and bonded by a fastening glue.

According to some embodiments of the utility model, the worm gear comprises a spoke core and a plastic member wrapped around at least a portion of the spoke core.

An electric power steering assembly according to an embodiment of the present invention includes a speed reducer of the electric power steering assembly according to an embodiment of the present invention.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of an electric power steering assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic view of the construction of a sealing plug according to an embodiment of the utility model;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1;

fig. 5 is a schematic view of a worm gear according to an embodiment of the present invention.

Reference numerals:

a speed reducer 100; an electric power steering assembly 200;

a reducer case 10; a worm mounting cavity 11; a mounting hole 12; a first bore section 121; a second bore section 122; a limit groove 123; a worm wheel mounting cavity 13;

a booster motor 20;

a worm shaft 30; a first bearing 31; a third bearing 32;

a sealing plug 40; a limit protrusion 41; a metal base 42; a metal end wall 421; a metal peripheral wall 422; a flexible sheath body 43; a flexible end wall 431; a flexible peripheral wall 432; a flexible flange 433;

a worm gear 50; a spoke core 51; an inner ring 511; a spoke 512; a plastic member 52;

a gear shaft 61; a positioning projection 611; a second bearing 62; a bearing inner race 621; a bearing outer race 622; a retaining member 63; a fourth bearing 64;

an input shaft 71; a torsion bar 72; a magnetic ring 73; a torque sensor 74;

a diverter 80; a diverter housing 81; a rack 82; tie rods 83.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and "a plurality" means two or more, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or may include the first and second features being not in direct contact but being in contact with another feature therebetween, and the first feature being "on", "above" and "above" the second feature may include the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is higher in level than the second feature.

The reducer 100 of the electric power steering assembly 200 according to the embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to fig. 1 to 5, a reducer 100 of an electric power steering assembly 200 according to an embodiment of the present invention may include: the device comprises a speed reducer shell 10, an assistant motor 20, a worm 30 and a sealing plug 40.

Specifically, as shown in fig. 1-2, the housing has a worm mounting cavity 11 and a mounting hole 12 communicating with the worm mounting cavity 11, the worm 30 is mounted in the worm mounting cavity 11, and the mounting hole 12 can facilitate mounting of the worm 30, a bearing and the like in the worm mounting cavity 11. The assist motor 20 is connected to the reducer case 10, and one end of the worm shaft 30 is connected to the assist motor 20 so that the assist motor 20 can provide steering assist.

Compared with hydraulic power-assisted steering, the power-assisted motor 20 does not need parts such as an oil pump, a pipeline and the like, so that the energy consumption is reduced, and the cost is saved; compared with a pipe column power-assisted steering system, the power-assisted motor 20 can be moved out of the cab from the inside of the cab, so that noise is reduced, and driving experience is improved. Meanwhile, the output torque of the power-assisted motor 20 can be amplified by the speed reducer 100 and then directly acts on the gear shaft 61, so that the steering efficiency is improved to a certain extent, more vehicle types with different weights can be covered, and intelligent driving can be better supported.

In addition, referring to fig. 2, the other end of the worm shaft 30 may be mounted to the mounting hole 12 to achieve the fixation of the worm shaft 30. For example, the other end of the worm shaft 30 may be mounted in the mounting hole 12 through a first bearing 31. Specifically, the first bearing 31 may be press-fitted into the mounting hole 12 with interference, and the other end of the worm shaft 30 is inserted into the first bearing 31. In some embodiments, one end of the worm shaft 30 may be further provided with a third bearing 32, and the first bearing 31 and the third bearing 32 cooperate to realize the supporting installation of the worm shaft 30 in the reducer case 10. The first bearing 31 and the third bearing 32 may be ball bearings.

With continued reference to fig. 1 and 2, a sealing plug 40 is located on the side of the worm shaft 30 remote from the assist motor 20, i.e., adjacent the first bearing 31. The sealing plug 40 is press-fitted into the mounting hole 12 with interference to seal the mounting hole 12. In the related technology, the mode of thread gluing and sealing is adopted, the cost is high, the assembly process is relatively complex, the embodiment of the utility model realizes the sealing mode through the interference press mounting of the sealing plug 40, the defects can be effectively improved, and the utility model has the advantages of easy assembly, simple disassembly, high reliability, low cost, difficult failure and the like.

In some embodiments, as shown in fig. 2, the mounting hole 12 includes a first hole section 121 and a second hole section 122, the first hole section 121 and the second hole section 122 are communicated with each other, and the hole diameter of the second hole section 122 is larger than that of the first hole section 121, so that the hole wall of the mounting hole 12 forms a stepped hole. The other end of the worm 30 can be mounted on the first bore section 121 through the first bearing 31, the sealing plug 40 can be mounted on the second bore section 122, and the first bore section 121 and the second bore section 122 with different bore diameters can be more adaptive to the sizes of the first bearing 31 and the second bearing 62, and the axial limiting of different parts can be conveniently realized. For example, the first bearing 31 may abut a step surface at one end of the first bore section 121, and the sealing plug 40 may abut a step surface at the other end of the first bore section 121.

In the assembling process, the first bearing 31 may be press-fitted to the first hole segment 121 in an interference manner, and then the sealing plug 40 may be press-fitted to the second hole segment 122 in an interference manner and abutted against the end surface of the first bearing 31 and the corresponding step surface, so as to seal the mounting hole 12 and axially limit the first bearing 31 and the sealing plug 40.

According to the reducer 100 of the electric power steering assembly 200 of the embodiment of the utility model, the sealing plug 40 is used for interference press-fitting to seal the mounting hole 12, so that the parts have the advantages of simple structure, simple assembly process, low cost, simplicity in disassembly, high reliability and the like.

According to some embodiments of the present invention, as shown in fig. 2 and 3, the inner circumferential surface of the mounting hole 12 may be provided with a stopper groove 123, for example, may be provided on the inner circumferential surface of the second hole section 122. The sealing plug 40 may be provided with a limiting protrusion 41 on the outer circumferential surface thereof, and after the sealing plug 40 is mounted in place in the mounting hole 12, the limiting protrusion 41 may extend into the limiting groove 123 to prevent the sealing plug 40 from coming out of the mounting hole 12.

Of course, the positions of the limiting groove 123 and the limiting protrusion 41 may be interchanged, specifically, the inner circumferential surface of the mounting hole 12 may be provided with the limiting protrusion 41, and the outer circumferential surface of the sealing plug 40 may be provided with the limiting groove 123, which may also extend into the limiting groove 123 through the limiting protrusion 41 to achieve the anti-dropping effect.

The specific structures of the limiting protrusion 41 and the limiting groove 123 are not particularly limited, and the limiting protrusion 41 can extend into the limiting groove 123 only after the sealing plug 40 is pressed in place. In some embodiments, the circumferential surface of the sealing plug 40 is a cylindrical surface, the limiting protrusion 41 may be an annular protrusion extending along the circumferential direction of the sealing plug 40, and the limiting groove 123 may be an annular groove with a corresponding shape, so that the sealing plug 40 can be pressed into the mounting hole 12 at any angle, and it is ensured that the annular protrusion can be accurately matched with the annular groove.

In some embodiments of the present invention, referring to fig. 2 and 3, the sealing plug 40 may include a metal substrate 42 and a compliant sleeve 43, wherein the compliant sleeve 43 is disposed around the metal substrate 42 such that the compliant sleeve 43 can be sealingly engaged with the wall of the mounting hole 12. By utilizing the elasticity of the flexible sleeve body 43, the sealing effect between the sealing plug 40 and the wall of the mounting hole 12 can be improved, and the sealing plug 40 can be more easily pressed into the mounting hole 12; by using the strength of the metal matrix 42, the strength of the whole sealing plug 40 can be improved, and the sealing effect is prevented from being influenced by the deformation of the sealing plug 40 in the press-fitting process and the working process of the speed reducer 100.

In some embodiments including the position-limiting protrusion 41 or the position-limiting groove 123, the position-limiting protrusion 41 or the position-limiting groove 123 may be disposed on the outer circumferential surface of the compliant sleeve body 43, and the position-limiting protrusion 41 can extend into the position-limiting groove 123 by utilizing the deformability of the compliant sleeve body 43.

In some embodiments, the compliant sleeve 43 may be made of rubber, and the metal substrate 42 and the compliant sleeve 43 are connected by vulcanizing rubber on the metal substrate 42, so as to ensure the reliability of the connection therebetween.

In some embodiments, as shown in fig. 3, the metal base 42 includes a metal end wall 421 and a metal peripheral wall 422, and one end of the metal peripheral wall 422 is connected to the outer peripheral edge of the metal end wall 421 to form a cover-like structure. The compliant sheath 43 includes a compliant end wall 431, a compliant peripheral wall 432, and a compliant rib 433, wherein one end of the compliant peripheral wall 432 is connected to the outer peripheral edge of the compliant end wall 431, and the compliant baffle is of an annular structure and the outer peripheral edge is connected to the other end of the compliant peripheral wall 432. The flexible end wall 431 is attached to the outer side of the metal end wall 421, the flexible peripheral wall 432 is attached to the outer side of the metal peripheral wall 422, and the flexible rib 433 abuts against the other end of the metal peripheral wall 422, so that the flexible sleeve body 43 wraps the outer surface of the metal base body 42, and the metal base body 42 is easily connected to form a firm whole. Here, "outer side" is to be understood as the side of the housing cavity facing away from the housing structure.

In some embodiments, the metal substrate 42 may be a unitary metal piece, and the compliant cover 43 may be a unitary rubber piece.

According to some embodiments of the present invention, as shown in fig. 1 and 4, the reducer housing 10 further has a worm wheel mounting cavity 13, the reducer 100 further includes a worm wheel 50, the worm wheel 50 is mounted in the worm wheel mounting cavity 13, and the worm wheel 50 and the worm 30 can be engaged with each other through a structure such as teeth and threads to realize power transmission. The axial direction of the worm wheel 50 is perpendicular to the axial direction of the worm 30, in other words, the intersection angle of the worm wheel 50 and the axis of the worm 30 is 90 degrees, so that the worm 30 can be effectively inhibited from generating larger axial force in the meshing motion process of the worm wheel 50 and the worm 30, the bearing (such as the first bearing 31 and the third bearing 32) for supporting the worm 30 is used for reducing play, the abnormal sound risk is reduced, the steering performance is improved, and the assembling property and the disassembling property are improved.

In some embodiments of the present invention, as shown in fig. 4, the decelerator 100 further includes a gear shaft 61, a second bearing 62 and a locker 63. Wherein, the gear shaft 61 can be installed in the gear installation cavity through the second bearing 62, so as to realize the supporting and fixing of the gear shaft 61. The second bearing 62 may be fixed to the reducer case 10 by interference press-fitting or the like. The worm wheel 50 is fitted around the gear shaft 61, for example, press-fitted to the gear shaft 61 with interference. The locking member 63 is sleeved on the gear shaft 61, and the locking member 63 abuts against the end surface of the second bearing 62 far away from the worm wheel 50, so that the axial positioning of the second bearing 62 is realized.

In some embodiments, the locker 63 and the gear shaft 61 may be screw-coupled and bonded by fastening glue to secure reliability of the coupling. During the assembly process, the locking member 63 may be applied with a fastening glue and then screwed to the gear shaft 61 to fix the second bearing 62. Compared with the riveting locking structure adopted in the related art, the locking structure of the locking piece 63 has lower cost and simpler assembly process.

In some embodiments, as shown in fig. 4, the outer circumferential surface of the gear shaft 61 is provided with a positioning protrusion 611, the second bearing 62 is a ball bearing, and the ball bearing includes a bearing inner ring 621 and a bearing outer ring 622 sleeved on the bearing inner ring 621. The positioning protrusion 611 and the locking member 63 respectively abut against two axial ends of the bearing inner ring 621 to fix the second bearing 62, and the positioning protrusion 611 spaces the second bearing 62 away from the worm wheel 50 to avoid interference or abrasion. In addition, the positioning protrusions 611 and the fastening members are abutted against the bearing inner ring 621, so that interference on relative rotation of the bearing outer ring 622 and the bearing inner ring 621 can be avoided, and rotation resistance is reduced.

According to some embodiments of the present invention, as shown in fig. 5, the worm wheel 50 may include a spoke core 51 and a plastic member 52, the plastic member 52 wrapping at least a portion of the spoke core 51. Compared with machined iron cores in the related art, the spoke type iron core 51 is lighter in weight and lower in material cost, and is beneficial to realizing the light weight of the electric power steering gear assembly 200.

In some embodiments, as shown in fig. 5, the spoke core 51 may include an inner ring 511 and a plurality of spokes 512, each spoke 512 extends along a radial direction of the inner ring 511, inner ends of the spokes 512 are connected with an outer circumferential surface of the inner ring 511, and the plurality of spokes 512 are spaced along a circumferential direction of the inner ring 511 to form a radial structure, so that the spoke core 51 has a hole structure to reduce weight and material consumption. Plastic member 52 may be injection molded to the outer ends of spokes 512.

In a further embodiment, the spoke core 51 may further include an outer ring, an inner circumferential surface of the outer ring is connected to an outer end of the spoke 512, and the plastic member 52 may wrap the outer end of the spoke 512 and the outer ring to ensure a structural strength of the spoke core 51.

In some embodiments, the spoke core 51 may be a powder metallurgy core, and the plastic part 52 may be injection-molded nylon, and the injection-molded nylon is connected to the powder metallurgy core through an injection molding process, so that the product weight is effectively reduced on the premise of ensuring the strength.

The electric power steering assembly 200 according to the embodiment of the present invention includes the reducer 100 of the electric power steering assembly 200 according to the embodiment of the present invention. Since the reducer 100 of the electric power steering assembly 200 according to the embodiment of the present invention has the above-mentioned advantageous technical effects, the electric power steering assembly 200 according to the embodiment of the present invention seals the mounting hole 12 by interference press-fitting of the sealing plug 40, and has the advantages of simple structure of parts, simple assembly process, low cost, easy disassembly, high reliability, and the like.

According to some embodiments of the present invention, as shown in fig. 1-4, the electric power steering assembly 200 further includes a steering gear 80, an end cap, an input shaft 71, a torsion bar 72, a magnetic ring 73, and a torque sensor 74, the steering gear 80 including a steering gear housing 81, a rack 82, and a tie rod 83.

The reducer housing 10 is connected with the steering gear housing 81 through fasteners (for example, three fastening bolts), the end cover is connected with the reducer housing 10 through fasteners (for example, two fastening bolts), the reducer housing 10 is connected with the power motor 20 through fasteners (for example, two fastening bolts), the tie rod 83 is connected with the rack 82 through screw fastening, and the steering gear 80 is directly and rigidly connected with the auxiliary frame of the whole vehicle through two through holes on the steering gear housing 81 through fasteners, so that a rubber bushing is omitted, and the straight material and the assembly process cost are reduced.

The input shaft 71 and the gear shaft 61 are connected by a torsion bar 72 through a press pin, the magnetic ring 73 is fixed on the input shaft 71, the torque sensor 74 is fixed on the gear shaft 61, the worm wheel 50 is press-fitted on the gear shaft 61, the second bearing 62 is press-fitted in the reducer housing 10, the gear shaft 61 is matched with the second bearing 62 and is screwed and fixed on the bearing inner ring 621 of the second bearing 62 through a locking piece 63 coated with a fastening glue, after the gear shaft 61 is meshed with the rack 82 through rotation, the reducer 100 is integrally inserted into the steering gear housing 81 and is connected and fixed through a fastening piece (for example, three fastening bolts). The end of the gear shaft 61 and the steering gear housing 81 can also be matched through a fourth bearing 64, and the fourth bearing 64 is matched with the second bearing 62 to support and fix the gear shaft 61. The fourth bearing 64 may be a needle bearing or the like.

When the system works, the sensor identifies information such as hand force of a driver, vehicle speed signals, road conditions and the like, and transmits the information to the controller in the form of electric signals, the controller transmits current with proper magnitude to the power-assisted motor 20 after comprehensive calculation, the power-assisted motor 20 outputs torque, the torque is amplified by the speed reducer 100 and then transmitted to the rack 82 through the gear shaft 61, and the rack 82 drives the tie rod 83 to move, so that the steering of the wheels is realized.

By the structure and the working process, the problems of complex part structure, complex assembly process, high failure rate, high part cost and assembly cost and the like in the prior art are solved. And can effectively restrain worm wheel 50 worm 30 in the meshing motion process worm 30 and produce great axial force, the bearing that uses for the support reduces the drunkenness, reduces the abnormal sound risk, promotes and turns to the performance, has optimized the assembling nature and the dismountability simultaneously, has lightweight, makes simply, low in production cost, the assembly is easy, disassembles advantages such as simple, the reliability height.

Other constructions and operations of the electric power steering assembly 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A reducer for an electric power steering assembly, comprising:

a reducer housing (10) having a worm mounting cavity (11) and a mounting hole (12) communicating with the worm mounting cavity (11);

the power-assisted motor (20), the power-assisted motor (20) is connected with the reducer shell (10);

the worm (30) is installed in the worm installation cavity (11), one end of the worm (30) is connected with the power-assisted motor (20), and the other end of the worm (30) is installed in the installation hole (12);

the sealing plug (40) is located on one side, away from the power-assisted motor (20), of the worm (30), and the sealing plug (40) is pressed in the mounting hole (12) in an interference fit mode to seal the mounting hole (12).

2. Reducer of electric power steering assembly according to claim 1, characterized in that the mounting hole (12) comprises a first hole section (121) and a second hole section (122), the second hole section (122) having a larger hole diameter than the first hole section (121), the other end of the worm screw (30) being mounted to the first hole section (121) by means of a first bearing (31), the sealing plug (40) being mounted to the second hole section (122).

3. The reducer of an electric power steering assembly according to claim 1, wherein one of an inner peripheral surface of the mounting hole (12) and an outer peripheral surface of the sealing plug (40) is provided with a stopper groove (123), and the other is provided with a stopper protrusion (41) protruding into the stopper groove (123).

4. A reducer of an electric power steering assembly according to claim 1, wherein the sealing plug (40) comprises a metal base (42) and a compliant sleeve (43) that is fitted over the metal base (42), the compliant sleeve (43) being in sealing engagement with the wall of the mounting hole (12).

5. Reducer of an electric power steering assembly according to any of claims 1-4, characterised in that the reducer housing (10) further has a worm wheel mounting cavity (13), the reducer further comprising a worm wheel (50), the worm wheel (50) being mounted to the worm wheel mounting cavity (13) and engaging with the worm (30), wherein,

the axial direction of the worm wheel (50) is perpendicular to the axial direction of the worm (30).

6. The reducer of an electric power steering assembly according to claim 5, further comprising:

the gear shaft (61), the said gear shaft (61) is installed in the said gear installation cavity through the second bearing (62), the said worm gear (50) is fitted on the said gear shaft (61);

the locking piece (63) is sleeved on the gear shaft (61) and abuts against the end face, far away from the worm wheel (50), of the second bearing (62).

7. The reducer of an electric power steering assembly according to claim 6, wherein the gear shaft (61) is provided at an outer peripheral surface thereof with a positioning protrusion (611), the second bearing (62) is a ball bearing and includes a bearing inner ring (621) and a bearing outer ring (622) sleeved on the bearing inner ring (621), and the positioning protrusion (611) and the locking member (63) respectively abut against two axial ends of the bearing inner ring (621).

8. The reducer of an electric power steering assembly according to claim 6, wherein the locker (63) is screw-coupled with the gear shaft (61) and bonded thereto by a fastening glue.

9. A reducer of an electric power steering assembly according to claim 5, wherein the worm gear (50) comprises a spoke core (51) and a plastic member (52) wrapped around at least a portion of the spoke core (51).

10. An electric power steering assembly comprising a speed reducer of an electric power steering assembly according to any one of claims 1 to 9.

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