CN210919979U - Clearance compensation transmission assembly and electric steering power-assisted system with same - Google Patents

Abstract

The utility model discloses a clearance compensation transmission assembly and have its electric power steering system. The backlash compensation transmission assembly includes: casing, be provided with clearance compensation arrangement and the driven worm wheel of intermeshing and worm in the casing, and clearance compensation arrangement includes: an elastic member. According to the utility model discloses a clearance compensation drive assembly, through setting up the elastic component, make elastic component and worm through direct or indirect contact, apply the pressure towards the worm wheel direction to the worm, consequently, clearance compensation arrangement through set up the flexure strip alright realize compensating the wearing and tearing clearance between worm wheel and the worm, not only can guarantee that worm wheel and worm complex reliability are high, simple structure moreover, and the elastic component is arranged in clearance compensation drive assembly's casing, and the cost is lower, convenient assembling.

Description

Clearance compensation transmission assembly and electric steering power-assisted system with same

Technical Field

The utility model relates to the technical field of vehicles, particularly, relate to a clearance compensation transmission assembly and have its electric power steering system.

Background

In order to prevent the electric power steering system from generating vibration or abnormal sound during working, the worm wheel and the worm are not accurate enough, or the worm wheel and the worm are engaged for a long time, the worm wheel and the worm are worn, so that the engagement gap is generated, and the electric power steering system generates vibration or abnormal sound during working, and the steering performance of a vehicle is affected.

Most of the existing clearance compensation transmission assemblies adopt a spring pin to apply radial force to a worm for clearance compensation, or adopt lever force of a leaf spring to act on a support bearing so as to ensure meshing of a worm wheel and the worm. However, the above solutions have high manufacturing cost, complicated structure, and the sealing performance cannot be ensured, and the assembly difficulty of the electric power steering system is large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. Therefore, the utility model provides a clearance compensation transmission assembly, this clearance compensation transmission assembly not only can compensate the wearing and tearing clearance between worm wheel and the worm, this clearance compensation transmission assembly's simple structure moreover.

The utility model also provides an electric power steering system of having above-mentioned clearance compensation drive assembly.

According to the utility model discloses clearance compensation drive assembly includes: the casing, be provided with clearance compensation arrangement and the driven worm wheel of intermeshing and worm in the casing, just clearance compensation arrangement includes:

an elastic member provided between the worm and an inner wall surface of the housing to directly or indirectly apply a pressure to the worm toward the worm wheel.

According to some embodiments of the utility model, be provided with support bearing on the worm, clearance compensation arrangement still includes the bush, the bush is suitable for the cover to establish on support bearing's the outer lane, one end of elastic component is only supported the internal face of casing, the other end of elastic component is only supported support bearing.

Further, the elastic member is a shaped spring and includes: the bearing comprises a body part and supporting parts positioned at two ends of the body part, wherein the body part is suitable for abutting against the inner wall surface of the shell, the lining is provided with a notch groove for exposing an outer ring of the supporting bearing, and the supporting parts abut against the outer ring through the notch groove.

Further, the support portion includes: the anti-jamming device comprises a supporting section and an anti-jamming section, wherein one end of the supporting section is connected with the body part, the other end of the supporting section is connected with the anti-jamming section, and the anti-jamming section extends towards the direction of the body part so as to enable the anti-jamming section to be separated from the outer ring.

Specifically, a buffer surface is further arranged on the bushing, so that a buffer space suitable for accommodating the elastic piece is formed between the buffer surface and the inner wall surface of the shell.

In particular, the bushing is a notched bushing with an adjustment clearance.

Further, a plurality of inner protrusions are arranged on the inner wall surface of the lining, and inner end surfaces of the inner protrusions are suitable for being matched with the outer ring of the supporting bearing.

Furthermore, a plurality of external grooves are formed in the outer wall surface of the bushing, the external grooves are separated from the inner wall surface of the shell, and the plurality of internal protrusions and the plurality of external grooves are in one-to-one correspondence in the radial direction of the bushing.

According to some embodiments of the utility model, it is protruding to be equipped with the location on the outer wall of bush, be equipped with on the casing be suitable for with the protruding complex constant head tank in location.

Compared with the prior art, the clearance compensation transmission assembly has the following advantages:

the gap compensation transmission assembly can compensate the abrasion gap between the worm wheel and the worm by arranging the elastic piece, not only can ensure high reliability of matching between the worm wheel and the worm, but also has simple structure, and the elastic piece is positioned in the shell of the gap compensation transmission assembly, so the cost is lower and the assembly is convenient.

According to another aspect of the present invention, an electric power steering system includes the above-mentioned backlash compensation transmission assembly.

Compared with the prior art, electric power steering system have following advantage:

the clearance compensation transmission assembly in the electric steering power-assisted system can realize the compensation of the clearance between the worm wheel and the worm by arranging the elastic part, and can ensure that the structure of the clearance compensation transmission assembly is simple; the clearance transmission assembly is also internally provided with a bush, so that the elastic part can be axially supported, and the bush is also internally provided with an internal bulge and an external groove which are in one-to-one correspondence, and an external bulge and an internal groove which are in one-to-one correspondence, so that the jumping and noise of the worm during reversing can be effectively absorbed, and the working stability of the clearance transmission assembly is better; the thickness of the elastic piece can be set according to the size of the gap between the worm and the worm wheel, so that the gap between the worm and the worm wheel can be compensated.

Drawings

FIG. 1 is a cross-sectional schematic view of a lash compensation drive assembly;

FIG. 2 is a schematic cross-sectional view of the resilient member in the housing;

FIG. 3 is a schematic view of the elastomeric member engaging the bushing;

FIG. 4 is a schematic view of the resilient member;

FIG. 5 is a schematic view of a bushing;

fig. 6 shows four embodiments of the bushing where the inner protrusion mates with the outer groove.

Reference numerals:

the clearance compensation transmission assembly 10, the shell 1, the positioning groove 11, the elastic piece 2, the body part 21, the supporting part 211, the supporting section 212, the anti-blocking section 213, the worm wheel 3, the worm 4, the supporting bearing 5, the bushing 6, the notch groove 61, the buffering surface 62, the buffering space 63, the inner protrusion 64, the outer groove 65, the positioning protrusion 66, the adjusting gap 67, the motor 7 and the screw plug 8.

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 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 drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "inner", "outer", and the like, 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, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

A backlash-compensating gear train assembly 10 according to an embodiment of the present invention is described in detail below with reference to fig. 1-6.

Referring to fig. 1, a backlash compensation transmission assembly 10 according to an embodiment of the present invention may include: the housing 1, the housing 1 is provided with a clearance compensation device and a worm wheel 3 and a worm 4 which are engaged with each other for transmission, in a specific embodiment, the clearance compensation transmission assembly 10 may further include: the motor 7 is meshed with an output shaft of the motor 7, the outer side of the worm wheel 3 is meshed with the worm 4, the torque of the motor 7 is transmitted through the worm wheel 3 and then input into the worm 4, and the worm 4 transmits the torque to the power steering unit connected with one end of the worm 4 after speed reduction and torque increase, so that power steering is achieved. Wherein, clearance compensation arrangement is located the other end of worm 4, and clearance compensation arrangement has the pressure towards worm wheel 3 direction to worm 4 to guarantee that worm wheel 3 and worm 4 are in the meshing all the time, thereby eliminate because of worm wheel 3 and worm 4 meshing clearance appear, and lead to electric power steering system to produce vibration or abnormal sound at the during operation, and then realized compensating the wearing and tearing clearance between worm wheel 3 and the worm 4, guarantee that worm wheel 3 and worm 4 reliability of work are high.

Specifically, as shown in fig. 1 to 2, the backlash compensation device may include: the elastic part 2 is arranged between the worm 4 and the inner wall surface of the shell 1 to directly or indirectly apply pressure to the worm 4 towards the worm wheel, namely, the elastic part 2 can directly apply pressure to the worm 4 towards the worm wheel 3 or indirectly apply pressure to the worm 4 so as to ensure that the worm wheel 3 can be constantly meshed with the worm 4, in the embodiment shown in fig. 1-2, the worm 4 is provided with the supporting bearing 5, the elastic part 2 applies pressure to the supporting bearing 5 sleeved on the worm 4, and accordingly the worm 4 is pressed, namely the elastic part 2 indirectly applies pressure to the worm 4 through the supporting bearing 5.

In an embodiment not shown, the elastic element 2 can also directly exert pressure on the worm 4, so that the worm wheel 3 can constantly remain in engagement with the worm 4.

Further, as shown in fig. 1, the clearance compensation device may further include a plug screw 8, the plug screw 8 is adapted to be screwed with the housing 1, and in a specific embodiment, the plug screw 8 may block an assembly opening of the clearance compensation device, so as to ensure the sealing of the clearance compensation transmission assembly 10, and may axially limit the clearance compensation device.

According to the utility model discloses clearance compensation drive assembly 10, through setting up elastic component 2, make elastic component 2 and worm 4 through direct or indirect contact, apply the pressure towards worm wheel 3 direction to worm 4, alright realize compensating the wearing and tearing clearance between worm wheel 3 and the worm 4, guarantee that worm wheel 3 and worm 4 reliability of work are high, compare in through the spring pin or the realization of leaf spring compensates the wearing and tearing clearance between worm wheel 3 and the worm 4, this clearance compensation drive assembly 10 through setting up the flexure strip alright realize compensating the wearing and tearing clearance between worm wheel 3 and the worm 4, not only can guarantee that worm wheel 3 and worm 4 complex reliability are high, and simple structure, and elastic component 2 is located clearance compensation drive assembly 10's casing 1, the cost is lower, and convenient assembling.

Further, the clearance compensation device may further include a bushing 6, and the bushing 6 is adapted to be sleeved on the outer ring of the support bearing 5, so as to radially support the worm 4 and ensure that the worm 4 can stably rotate.

Specifically, as shown in fig. 2, one end of the elastic member 2 abuts against the inner wall surface of the housing 1 to support the elastic member 2, and the other end of the elastic member 2 abuts against the support bearing 5 to apply a pressing force to the worm 4 in the direction toward the worm wheel 3. In the specific embodiment, the elastic member 2 has a certain elasticity, and when the elastic member 2 is located between the inner wall surface of the casing 1 and the worm 4, the elastic member is always in a compression state, therefore, under the action of the restoring force of the elastic member 2, the pressure towards the direction of the worm wheel 3 is always exerted on the worm 4, so that after a gap is formed between the worm 4 and the worm wheel 3, the compensation of the gap between the worm 4 and the worm wheel 3 is realized through the pressure of the elastic member 2 on the worm 4, the reliability of the cooperation of the worm 4 and the worm wheel 3 is further ensured to be high, and the good working stability of the gap compensation transmission assembly 10 is ensured.

Further, as shown in fig. 2 to 4, the elastic member 2 is a shaped spring and may include: the worm gear comprises a body part 21 and supporting parts 211 positioned at two ends of the body part 21, wherein the body part 21 is fixedly connected with the supporting parts 211, the body part 21 is suitable for stopping against the inner wall surface of the shell 1 so as to support the elastic part 2, the supporting parts 211 are suitable for being connected with an outer ring of a supporting bearing 5 sleeved on the worm 4 and have pressure on the supporting bearing 5, so that the worm 4 is indirectly stressed, and the meshing reliability of the worm 4 and the worm wheel 3 is ensured.

Further, as shown in fig. 5, the bush 6 is provided with a notch groove 61 for exposing the outer ring of the support bearing 5, and the support portion 211 is stopped against the outer ring of the support bearing 5 through the notch groove 61, so that the support portion 211 can be brought into contact with the support bearing 5.

Further, as shown in fig. 4, the supporting portion 211 may include: support section 212, anti-sticking section 213, the one end of support section 212 links to each other with this body portion 21, the other end of support section 212 links to each other with anti-sticking section 213, and anti-sticking section 213 extends towards this body portion 21 direction to make anti-sticking section 213 and outer lane separation, thereby when preventing that support section 212 from supporting support bearing 5, support section 212 and support bearing 5's contact surface takes place the jamming, and then leads to elastic component 2 to the support of support bearing 5 to become invalid, leads to the work of clearance compensation drive assembly 10 to become invalid.

Preferably, as shown in fig. 4, one end of the supporting section 212 is connected to the body portion 21 by a rounded corner, and the other end of the supporting section 212 is connected to the anti-jamming section 213 by a rounded corner, so as to prevent stress concentration at the connection between the supporting section 212 and the body portion 21 and the connection between the supporting section 212 and the anti-jamming section 213 when the supporting portion 211 is deformed, which may cause the elastic member 2 to be easily broken or fatigue-bent, thereby causing the operation failure of the elastic member 2.

Specifically, elastic component 2 can be the rigid structure of elasticity, not only can guarantee that elastic component 2 has better elasticity to guarantee that elastic component 2 can compensate the clearance between worm 4 and the worm wheel 3 in time, but also can guarantee that elastic component 2's life is longer.

In the specific embodiment, the pressure of the elastic part 2 on the worm 4 can be changed by changing the thickness of the elastic part 2, so that the thickness of the elastic part 2 can be selected according to the size of the gap generated by meshing abrasion of the worm 4 and the worm wheel 3, and reliable gap compensation of the worm 4 and the worm wheel 3 is ensured.

Specifically, as shown in fig. 5, the bushing 6 is further provided with a buffering surface 62, so as to form a buffering space 63 suitable for accommodating the elastic element 2 between the buffering surface 62 and the inner wall surface of the housing 1, the supporting section 212 of the elastic element 2 can be in contact with the buffering surface 62, so that the elastic element 2 is supported and limited, and the supporting section 211 of the elastic element 2 can be compressed or rebounded by the buffering space 63, so that the elastic element 2 is ensured to have a certain movement space, and the normal operation of the elastic element 2 is ensured.

Specifically, as shown in fig. 5, the bushing 6 is a notched bushing 6 having an adjustment gap 67, that is, the bushing 6 is an incomplete bushing 6, and by providing the adjustment gap 67, the bushing 6 can be ensured to have a space for adjusting the size, thereby ensuring that the bushing 6 is easy to assemble.

Further, as shown in fig. 5, the inner wall surface of the bush 6 is provided with a plurality of inner protrusions 64, inner end surfaces of the plurality of inner protrusions 64 are adapted to be fitted with the outer ring of the support bearing 5, the outer wall surface of the bush 6 is provided with a plurality of outer grooves 65, the outer grooves 65 are separated from the inner wall surface of the housing 1, and the plurality of inner protrusions 64 and the plurality of outer grooves 65 correspond one-to-one in the radial direction of the bush 6. Specifically, the plurality of inner protrusions 64 are uniformly arranged on the inner wall surface of the liner 6, and, between two adjacent inner protrusions 64, there are inner grooves with respect to the inner protrusions 64, and since the plurality of inner protrusions 64 are uniformly distributed on the inner wall surface of the liner 6, the plurality of inner grooves are also uniformly distributed on the inner wall surface of the liner 6, thereby forming the inner protrusions 64 and the inner grooves which are connected in sequence on the inner wall surface of the liner 6; and, a plurality of external recesses 65 are uniformly arranged on the outer wall surface of the bush 6, and, between two adjacent external recesses 65, there are external protrusions with respect to the external recesses 65, because a plurality of external recesses 65 are uniformly distributed on the outer wall surface of the bush 6, a plurality of external protrusions are uniformly distributed on the outer wall surface of the bush 6, thereby forming external recesses 65 and external protrusions which are connected in sequence on the outer wall surface of the bush 6, and in the radial direction of the bush 6, the internal protrusions 64 correspond to the external recesses 65 one-to-one, and the internal recesses correspond to the external protrusions one-to-one. The plurality of external protrusions are part of the outer wall surface of the bush 6, and the plurality of internal grooves are part of the inner wall surface of the bush 6.

In the embodiment, the meshing direction of the worm 4 and the worm wheel 3 in the backlash compensation transmission assembly 10 changes, and the worm 4 greatly jumps at the moment when the rotation direction of the worm 4 and the worm wheel 3 changes, so that the jumping of the worm 4 can be buffered and noise can be absorbed by arranging the one-to-one corresponding inner protrusion 64 and the one-to-one corresponding outer groove 65, and the one-to-one corresponding inner groove and the one-to-outer protrusion on the bushing 6, thereby ensuring that the working stability of the worm 4 is good.

Moreover, by arranging the inner grooves and the outer protrusions in one-to-one correspondence, and the inner protrusions 64 and the outer grooves 65 in one-to-one correspondence, the shaking of the support bearing 5 can be buffered when a force is applied, the pre-pressure on the support bearing 5 is increased, and the stable operation of the worm 4 is ensured.

Specifically, as shown in fig. 6, by adjusting the depth L and the shape of the inner protrusion 64 and the outer groove 65, the rigidity of the bushing 6 can be changed, so as to ensure that the bushing 6 can absorb different forces exerted by different torques of the worm 4 on the support bearing 5, thereby ensuring that the bushing 6 has good versatility.

In the four embodiments shown in fig. 6, the first three are to achieve rigidity of the bush 6 by changing the depth L of the outer groove 65, and the fourth embodiment is to change the rigidity of the bush 6 by changing the shape of the outer groove 65.

Further, as shown in fig. 2 and 5, a positioning protrusion 66 is provided on an outer wall surface of the bushing 6, and a positioning groove 11 adapted to be engaged with the positioning protrusion 66 is provided on the housing 1, so that the positioning protrusion 66 is engaged with the positioning groove 11, thereby axially and radially positioning the worm 4.

Specifically, the bushing 6 can be a plastic part, which not only ensures that the bushing 6 has low cost and low weight, but also ensures that the plastic part is easy to deform and the bushing 6 is easy to install.

According to another aspect of the present invention, an electric power steering system includes the backlash compensation transmission assembly 10 of the above embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (9)

1. A lash compensating drive assembly (10), comprising: casing (1), be provided with clearance compensation arrangement and intermeshing driven worm wheel (3) and worm (4) in casing (1), just clearance compensation arrangement includes:

an elastic member (2), the elastic member (2) being provided between the worm (4) and an inner wall surface of the housing (1) to directly or indirectly apply a pressure to the worm (4) toward the worm wheel (3);

the supporting bearing (5), the said supporting bearing (5) is fitted over the said worm (4);

the bearing comprises a bushing (6), the bushing (6) is suitable for being sleeved on the outer ring of the supporting bearing (5), a gap groove (61) enabling the outer ring of the supporting bearing (5) to be exposed is formed in the bushing (6), one end of an elastic piece (2) is abutted to the inner wall face of the shell (1), and the other end of the elastic piece (2) is abutted to the supporting bearing (5) through the gap groove (61).

2. The backlash compensating transmission assembly (10) according to claim 1, wherein said elastic element (2) is a shaped spring and comprises: the bearing comprises a body part (21) and supporting parts (211) positioned at two ends of the body part (21), wherein the body part (21) is suitable for abutting against the inner wall surface of the shell (1), and the supporting parts (211) abut against the outer ring through the notch groove (61).

3. The lash compensation drive assembly (10) of claim 2, wherein the support portion (211) comprises: the anti-jamming device comprises a supporting section (212) and an anti-jamming section (213), wherein one end of the supporting section (212) is connected with the body part (21), the other end of the supporting section (212) is connected with the anti-jamming section (213), and the anti-jamming section (213) extends towards the direction of the body part (21) so that the anti-jamming section (213) is separated from the outer ring.

4. The backlash compensating gear assembly (10) according to claim 1, wherein a damping surface (62) is further provided on the bushing (6) to form a damping space (63) adapted to accommodate the elastic member (2) between the damping surface (62) and an inner wall surface of the housing (1).

5. The lash compensation drive assembly (10) of claim 1, wherein the bushing (6) is a notched bushing (6) having an adjustment clearance (67).

6. A lash compensating drive assembly (10) as claimed in claim 5, wherein the inner wall surface of the bush (6) is provided with a plurality of internal projections (64), the inner end surfaces of the plurality of internal projections (64) being adapted to engage with the outer race of the support bearing (5).

7. The backlash compensating gear assembly (10) according to claim 6, wherein a plurality of external grooves (65) are provided on an outer wall surface of the bush (6), the external grooves (65) are separated from an inner wall surface of the housing (1), and a plurality of the internal protrusions (64) and a plurality of the external grooves (65) correspond one-to-one in a radial direction of the bush (6).

8. The backlash compensating transmission assembly (10) according to claim 1, wherein the outer wall of the bushing (6) is provided with a positioning projection (66), and the housing (1) is provided with a positioning slot (11) adapted to cooperate with the positioning projection (66).

9. An electric power steering system, characterized by comprising a backlash-compensating transmission assembly (10) according to any one of claims 1 to 8.

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