CN114131311A - Coaxiality adjusting device, worm and gear steering machine and assembling device - Google Patents

Coaxiality adjusting device, worm and gear steering machine and assembling device Download PDF

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Publication number
CN114131311A
CN114131311A CN202111444166.9A CN202111444166A CN114131311A CN 114131311 A CN114131311 A CN 114131311A CN 202111444166 A CN202111444166 A CN 202111444166A CN 114131311 A CN114131311 A CN 114131311A
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CN
China
Prior art keywords
tolerance ring
worm
press
deformation
shaft
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CN202111444166.9A
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Chinese (zh)
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CN114131311B (en
Inventor
邓念
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China Automotive Innovation Co Ltd
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China Automotive Innovation Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
    • B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
    • H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel

Abstract

The invention relates to the technical field of steering, and discloses a coaxiality adjusting device, a worm and gear steering machine and an assembling device. The elastic tolerance ring can also reduce vibration and noise of the worm and gear steering engine during working, and even if vibration during working causes looseness between the hole parts and the shaft parts or circumferential relative sliding between the hole parts and the shaft parts under the limit working condition, torque transmission between the hole parts and the shaft parts cannot be damaged, the elastic tolerance ring can still continue to provide stable friction torque, and normal transmission of the torque can be guaranteed.

Description

Coaxiality adjusting device, worm and gear steering machine and assembling device
Technical Field
The invention relates to the technical field of steering, in particular to a coaxiality adjusting device, a worm and gear steering machine and an assembling device.
Background
The double-pinion electric power steering system mostly adopts a worm gear and worm steering gear to carry out power transmission, a worm is connected with a motor spindle to receive the torque of a motor, the motor transmits power to a driving gear shaft through a worm gear and worm mechanism, and the driving gear shaft drives a rack meshed with the driving gear shaft to reciprocate in a steering gear shell, so that the automobile steering function is realized. The worm gear mechanism has the functions of reducing speed and increasing torque, and can amplify the torque of the motor to more than 20 times.
When the worm gear mechanism and the driving gear shaft are connected, the worm gear and the driving gear shaft are assembled in a press fitting mode. The worm wheel and the driving gear shaft are rigidly connected in a press-fitting mode, so that the following technical problems exist:
(1) when the worm wheel and the driving gear shaft are pressed and installed, an inner hole of the worm wheel is usually set to be a unthreaded hole, one end of the driving gear shaft is set to be an optical shaft or a spline shaft, and if the driving gear shaft is designed by adopting the optical shaft, the size of the optical shaft is very sensitive to the pressing force when the worm wheel and the driving gear shaft are pressed and installed, so that higher processing requirements on the precision and the surface roughness of the optical shaft are provided; if the drive gear shaft adopts the design of the spline shaft, the processing cost of parts can be increased.
(2) When the worm wheel is rigidly connected with the driving gear shaft in a press-fitting mode, the worm wheel and the driving gear shaft are easy to generate vibration noise during working.
(3) In the direct press-fitting process of the worm wheel and the driving gear shaft, the phenomenon of worm wheel pressure deviation is easy to occur, so that the meshing state of the worm wheel and the worm is influenced, and a series of consequences such as noise, vibration, sound vibration roughness, torque fluctuation and the like can be generated; in severe cases, the worm wheel and the driving gear shaft can even fail to be pressed.
Similarly, in the prior art, when the worm and gear mechanism is connected with the motor spindle, the motor spindle and the coupler connected with the motor spindle are often pressed, and the connection mode of the worm and the coupler is the same as that of the worm wheel and the driving gear shaft, so that the connection between the worm and the coupler has the problems.
Disclosure of Invention
The invention aims to provide a coaxiality adjusting device, a worm and gear steering machine and an assembling device, which can correct the deviation during press mounting, improve the assembling precision of two press mounting parts, reduce the torque fluctuation of the two connected press mounting parts during power transmission, reduce the vibration and noise of the worm and gear steering machine during working and play a role in protecting the rigid connection of hole parts and shaft parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coaxiality adjusting device is connected with two press-fitting parts, wherein the two press-fitting parts are respectively a hole part and a shaft part, and the hole part is sleeved outside the shaft part; the coaxiality adjusting device comprises:
an elastic tolerance ring sandwiched between an inner peripheral surface of the hole-like member and an outer peripheral surface of the shaft-like member;
the resilient tolerance ring is configured to be resiliently deformable in a radial direction during press-fitting to permit movement of one of the press-fitting components until coaxial with the other of the press-fitting components.
As an optional technical solution of the coaxiality adjusting device, a deformation space is provided on the elastic tolerance ring, and the deformation space is used for providing a space for elastic deformation of the elastic tolerance ring in a press-fitting process.
As an alternative to the above-described coaxiality adjusting apparatus, the elastic tolerance ring includes:
the correcting device comprises a correcting body, wherein the correcting body is a C-shaped ring, and the deformation space is an axial opening in the periphery of the C-shaped ring.
As an alternative to the above-mentioned coaxiality adjusting device, the elastic tolerance ring further includes:
the deformation convex parts are arranged on the peripheral surface of the deviation rectifying body at intervals in a protruding mode and are abutted to the hole type component; and/or the deviation rectifying body is arranged on the inner circumferential surface of the deviation rectifying body at intervals in a protruding mode and is abutted to the shaft part.
As an optional technical solution of the coaxiality adjusting device, the deformation convex part comprises a protrusion protruding from an inner circumferential surface to an outer circumferential surface of the correction body;
and/or the presence of a gas in the gas,
and the projection protrudes from the outer circumferential surface to the inner circumferential surface of the deviation rectifying body.
As an optional technical solution of the coaxiality adjusting device, the radial thickness of the elastic tolerance ring is 2% to 5% of the inner diameter thereof.
As an optional technical solution of the coaxiality adjusting device, a deformation groove is formed at the bottom of the deformation convex part, and the cross section of the deformation groove is fan-shaped, rectangular or trapezoidal.
As an optional technical scheme of the coaxiality adjusting device, the cross section of the deformation groove is in a fan shape, the axial length of the deformation convex part is 1.2-3.0 mm, and the circumferential arc length of the deformation convex part is 0.8-2.0 mm.
As an alternative to the above-mentioned coaxiality adjusting device, the deformation convex part is at least partially embedded in the press-fitting component.
As an optional technical solution of the coaxiality adjusting device, the press-fitting component in which the deformation convex part is embedded has a hardness smaller than that of the elastic tolerance ring.
As an optional technical solution of the coaxiality adjusting device, the deformation convex part is arranged on the inner circumferential surface of the elastic tolerance ring, and the occupied area of the deformation convex part is 33% -55% of the surface area of the inner circumferential surface of the elastic tolerance ring;
alternatively, the first and second electrodes may be,
the deformation convex part is arranged on the outer peripheral surface of the elastic tolerance ring, and the area of the set area is 33% -55% of the surface area of the outer peripheral surface of the elastic tolerance ring.
As an alternative to the above-mentioned coaxiality adjusting device, the yield strength of the material from which the elastic tolerance ring is made is greater than 450 MPa.
The invention also provides a worm gear steering engine, comprising:
a drive unit;
the input end of the worm is connected with the output shaft of the driving unit through a coupler, and the driving unit is used for driving the worm to rotate;
the worm wheel is meshed with the worm, and the worm wheel is connected with a driving gear shaft;
the coaxiality adjusting device also comprises the coaxiality adjusting device in any scheme;
the elastic tolerance ring is arranged between the input end of the worm and the driven end of the coupler;
and/or the elastic tolerance ring is arranged between the driving gear shaft and the worm gear;
and/or the elastic tolerance ring is arranged between the output shaft of the driving unit and the driving end of the coupler.
The invention also provides a worm gear steering engine, comprising:
a drive unit;
the input end of the worm is connected with the output shaft of the driving unit, and the driving unit is used for driving the worm to rotate;
the worm wheel is meshed with the worm, and the worm wheel is connected with a driving gear shaft;
the coaxiality adjusting device also comprises the coaxiality adjusting device in any scheme;
the elastic tolerance ring is arranged between the input end of the worm and the output shaft of the driving unit;
and/or the elastic tolerance ring is arranged between the driving gear shaft and the worm gear.
The invention also provides an assembling device which is used for assembling the coaxiality adjusting device; the assembling apparatus includes:
the first clamping structure is used for clamping one press-mounting component in the coaxiality adjusting device;
a second clamping structure for clamping the other press fitting component of the coaxiality adjusting device, one of the first clamping structure and the second clamping structure being capable of swinging;
and the press fitting machine is used for driving the first clamping structure to drive the press fitting parts clamped by the first clamping structure to be close to the other press fitting part in the axial direction so as to sleeve the hole parts outside the shaft parts and enable the elastic tolerance ring to be clamped between the outer peripheral surfaces of the shaft parts and the inner peripheral surfaces of the hole parts.
The invention has the beneficial effects that: the invention provides a coaxiality adjusting device, a worm and gear steering machine and an assembling device, wherein an elastic tolerance ring is arranged between a hole part and a shaft part, when the hole part and the shaft part are assembled in a press-fitting mode, the elastic tolerance ring is firstly installed on the hole part or the shaft part, if the hole part and the shaft part deflect in the press-fitting process, the elastic tolerance ring can elastically deform under the extrusion action of the shaft part and the hole part and can react on the hole part and the shaft part to enable one of the hole part and the shaft part to swing, so that the hole part and the shaft part are coaxial, the press-biasing and press-fitting failures are prevented, the assembling precision of the two press-fitting parts is improved, the torque fluctuation when the two connected press-fitting parts transmit power is reduced, and the NVH performance of the worm and gear steering machine is improved.
Because the elastic tolerance ring can elastically deform, the elastic tolerance ring is arranged between the inner peripheral surface of the hole part and the outer peripheral surface of the shaft part, vibration and noise during working of the worm and gear steering engine can be reduced, even if vibration during working enables looseness to be generated between the hole part and the shaft part or the hole part and the shaft part to generate circumferential relative sliding under a limit working condition, torque transmission between the hole part and the shaft part cannot be damaged, the elastic tolerance ring can still continue to provide stable friction torque, normal torque transmission can be effectively guaranteed, the effect of protecting connection between two press-fitting parts is achieved, and the phenomenon that the hole part and the shaft part are damaged or slip is generated is prevented. Compared with the mode that one end of the shaft part is set to be the optical axis, the sensitivity of the shaft part to the press-fitting force in the press-fitting process can be reduced, and the requirements on the machining precision and the surface roughness of the shaft part and the hole part are reduced; compared with the shaft part provided with the spline matched with the hole part, the processing cost of the parts can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a worm and gear steering system provided by an embodiment of the invention;
FIG. 2 is a partial exploded view of a worm gear steering gear according to an embodiment of the present invention;
FIG. 3 is an assembly view of a worm wheel and a worm in a worm and gear steering engine provided by an embodiment of the present invention;
FIG. 4 is a first cross-sectional view of FIG. 3;
FIG. 5 is a second cross-sectional view of FIG. 3;
FIG. 6 is a second partial exploded view of the worm gear steering gear provided in the embodiment of the present invention;
fig. 7 is a sectional view showing an assembled state of an output shaft of a motor and an input end of a worm in the worm gear steering gear according to the embodiment of the present invention;
FIG. 8 is a schematic diagram of a resilient tolerance ring provided by an embodiment of the present invention;
fig. 9 is a process diagram of a resilient tolerance ring provided by an embodiment of the present invention.
In the figure:
1. a motor; 11. an output shaft; 2. a worm; 3. a worm gear; 4. a drive gear shaft; 5. a coupling; 51. an active end; 52. a passive end; 53. an elastic pad;
6. a big end bearing; 7. a small end bearing; 8. a self-aligning bearing; 9. a bearing inner ring hoop;
20. an input shaft; 30. a drive controller;
40. an elastic tolerance ring; 401. a first elastic tolerance ring; 402. a second elastic tolerance ring; 41. a deviation rectifying body; 42. a deformation convex part; 43. a deformation groove; 44. and (4) deformation space.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
As shown in fig. 1 to 7, this embodiment provides a worm and gear steering machine and an electric power steering system, taking a double-pinion electric power steering system as an example, the double-pinion electric power steering system includes a worm and gear steering machine, the worm and gear steering machine includes a worm wheel 3, a worm 2 and a driving unit, wherein an input end of the worm 2 is connected with an output shaft of the driving unit through a coupling 5, the driving unit is a motor 1, an output shaft of the driving unit is an output shaft 11 of the motor 1, the worm wheel 3 is engaged with the worm 2, the worm wheel 3 is connected with a driving gear shaft 4, and the driving gear shaft 4 is connected with a rack and pinion structure. An input shaft 20 of the double-pinion electric power steering system is connected with the intermediate shaft and used for receiving torque input from a steering wheel of a driver and outputting the torque input to a wheel end; simultaneously through detecting element with input signal transmission to drive controller 30, realize the control to motor 1, control motor 1 drives worm 2 through shaft coupling 5 and rotates, and worm 2 drives worm wheel 3 rotatory, and worm wheel 3 drives the rack reciprocating motion of rack and pinion structure through drive gear axle 4 to export the moment of torsion to the wheel end, realize electric power steering system's supplementary steering function.
In the prior art, the output shaft 11 of the motor 1 is connected with the driving end 51 of the coupling 5, and the driven end 52 of the coupling 5 is press-fitted with the input end of the worm 2. During the press mounting process, the passive end 52 of the coupling 5 and the input end of the worm 2 have a pressure deviation phenomenon, so that the power transmission between the motor 1 and the worm 2 is influenced. The worm wheel 3 and the driving gear shaft 4 are also connected in a press-fitting mode, so that the problem of pressure deviation also exists in the press-fitting process.
In order to prevent the deviation of the two paired press-fitting components in the press-fitting process, the coaxiality adjusting device is provided in the present embodiment, and is used for press-fitting hole components and shaft components, the hole components are sleeved outside the shaft components in a press-fitting manner, an elastic tolerance ring 40 is arranged between the inner circumferential surface of the hole components and the outer circumferential surface of the shaft components, and the elastic tolerance ring 40 is configured to be capable of elastically deforming in the press-fitting process, so that at least one press-fitting component swings to make the two press-fitting components coaxial.
In this embodiment, of the passive end 52 of the coupling 5 and the input end of the worm 2, the passive end 52 of the coupling 5 is a hole-like component, and the input end of the worm 2 is a shaft-like component. Of the worm wheel 3 and the drive gear shaft 4, the worm wheel 3 is a hole-like member, and the drive gear shaft 4 is a shaft-like member.
In order to facilitate the assembly of the two press-fitting parts, a limiting surface is arranged on the shaft part, the shaft part is fixed, and the elastic tolerance ring 40 is sleeved on the shaft part, so that the elastic tolerance ring 40 is abutted against the limiting surface; an axial force is applied to the bore-like member to axially bring the bore-like member closer to the shaft-like member to sleeve the shaft-like member outside the bore-like member and to sandwich the elastic tolerance ring 40 between the outer circumferential surface of the shaft-like member and the inner circumferential surface of the bore-like member.
In another embodiment, the shaft member may be fixed, a stopper surface may be provided in the hole member, the elastic tolerance ring 40 may be fitted into the hole member and abutted against the stopper surface, an axial force may be applied to the hole member to bring the hole member axially closer to the shaft member, the shaft member may be fitted outside the hole member, and the elastic tolerance ring 40 may be interposed between an outer circumferential surface of the shaft member and an inner circumferential surface of the hole member. The hole components may also be fixed, the elastic tolerance ring 40 may be installed in the hole components or sleeved in the shaft components, and then an axial force may be applied to the shaft components to allow the shaft components to be sleeved outside the hole components, and the elastic tolerance ring 40 may be interposed between the outer circumferential surfaces of the shaft components and the inner circumferential surfaces of the hole components.
In order to assemble the two press-fitting components by press-fitting, the present embodiment also provides an assembling device by which the two press-fitting components are assembled. The assembling device comprises a press-fitting machine, a first clamping structure and a second clamping structure, wherein the first clamping structure is used for clamping one press-fitting component, the second clamping structure is used for clamping the other press-fitting component, and one of the first clamping structure and the second clamping structure can swing; the press-fitting machine is used for driving the first clamping structure to drive the clamped press-fitting component to axially approach to another press-fitting component so as to sleeve the hole component outside the shaft component, and the elastic tolerance ring 40 is clamped between the outer peripheral surface of the shaft component and the inner peripheral surface of the hole component. Illustratively, the press-fitting machine is a hydraulic press-fitting machine, and the press-fitting force provided by the hydraulic press-fitting machine is 20 KN-25 KN.
If the hole parts and the shaft parts are deflected in the press-fitting process, the elastic tolerance ring 40 can elastically deform under the extrusion action of the shaft parts and the hole parts and can react with the hole parts and the shaft parts to enable one of the hole parts and the shaft parts to swing, so that the hole parts and the shaft parts are coaxial, the press-deflection and press-fitting failures are prevented, the assembly precision of the two press-fitting parts is improved, and the torque fluctuation of the two connected press-fitting parts during power transmission is reduced.
Because the elastic tolerance ring 40 can elastically deform, the elastic tolerance ring 40 is arranged between the inner peripheral surface of the hole part and the outer peripheral surface of the shaft part, vibration and noise during working of the worm and gear steering engine can be reduced, even if vibration during working enables looseness to be generated between the hole part and the shaft part or the hole part and the shaft part to generate circumferential relative sliding under a limit working condition, torque transmission between the hole part and the shaft part cannot be damaged, the elastic tolerance ring 40 can still continue to provide stable friction torque, normal torque transmission can be effectively guaranteed, the effect of protecting connection between the two press-fitting parts is achieved, and the phenomenon that the hole part and the shaft part are damaged or slip is generated is prevented. Compared with the mode that one end of the shaft part is set to be the optical axis, the sensitivity of the shaft part to the press-fitting force in the press-fitting process can be reduced, and the requirements on the machining precision and the surface roughness of the shaft part and the hole part are reduced; compared with the shaft part provided with the spline matched with the hole part, the processing cost of the parts can be reduced.
In order to enable the two press-fitting components to be coaxial, the swing angle of each press-fitting component is limited, for example, the first clamping structure is arranged on the press-fitting machine, the first clamping structure can swing around the axis of axial force applied by the press-fitting machine as a central axis by taking the connecting point of the first clamping structure and the press-fitting machine as a swing point, and the swing angle of the first clamping structure is less than or equal to 3 degrees. Illustratively, the above-described swing angle may be any one of 0.5 °, 1 °, 1.5 °, 2 °, 2.5 °, and 3 °. In other embodiments, a second clamping structure may be mounted on the bracket, a connection point of the second clamping structure and the press-fitting machine is on an axis of the press-fitting machine for applying the axial force, the second clamping structure may swing around the axis of the press-fitting machine for applying the axial force as a central axis with the connection point of the second clamping structure and the press-fitting machine as a swing point, and a swing angle of the second clamping structure is less than or equal to 3 °.
It should be noted that the specific structures of the press machine, the first clamping structure and the second clamping structure are all the prior art, and are not described in detail. The embodiment improves the connection between the first clamping structure and the press-mounting machine and the connection between the second clamping structure and the bracket on the basis of the existing structure, so that the first clamping structure and the second clamping structure can swing, such as ball joint and the like, and the details are not described herein.
Further, the elastic tolerance ring 40 is provided with a deformation space 44, and the deformation space 44 is used for providing a space for the elastic deformation of the elastic tolerance ring 40 during the press-fitting process. Illustratively, the elastic tolerance ring 40 includes a corrective body 41, the corrective body 41 is a C-ring, and the deformation space 44 is an axial opening on the outer periphery of the C-ring. Optionally, the angle of the axial opening of the C-shaped ring is 10 ° to 25 °, two opposite opening end faces of the axial opening are radial planes passing through the central axis of the C-shaped ring, and the angle of the axial opening of the C-shaped ring is an included angle between the two radial planes, so that a space is provided for elastic deformation in the press fitting process, the material flow is facilitated, and material accumulation during press fitting is prevented from affecting the process performance. The angle of the axial opening of the C-ring may be any one of 10 °, 11 °, 12 °, 13 °, 14 °, 15 °, 16 °, 17 °, 18 °, 19 °, 20 °, 21 °, 22 °, 23 °, 24 °, and 25 °.
In the process of applying axial force to the hole parts to sleeve the hole parts outside the shaft parts, when the hole parts and the shaft parts are pressed and assembled, the elastic tolerance ring 40 will elastically deform under the extrusion action of the hole parts and the shaft parts, the deformation space 44 is provided for the elastic deformation of the elastic tolerance ring 40, and meanwhile, the elastic tolerance ring 40 will apply radial force to the hole parts and the shaft parts to enable the inclined press-assembled parts to swing, so that the hole parts and the shaft parts are coaxial. The elastic tolerance ring 40 is capable of elastic deformation and facilitates the sleeving of the elastic tolerance ring 40 over the shaft prior to press fitting.
In other embodiments, the deviation rectifying body 41 is not limited to a C-ring, but an annular deviation rectifying body 41 may be adopted, and two axial end faces of the deviation rectifying body 41 are respectively provided with avoiding grooves penetrating through the inner and outer circumferential surfaces of the deviation rectifying body 41, the axial length of the avoiding groove is smaller than the axial length of the deviation rectifying body 41, the avoiding grooves at the two axial ends of the deviation rectifying body 41 are arranged in a staggered manner, the sum of the axial lengths of two adjacent avoiding grooves at the two axial ends of the deviation rectifying body 41 is greater than the axial length of the deviation rectifying body 41, the deformation space 44 is formed by the avoiding grooves, so that a space is provided for the extrusion deformation of the deviation rectifying body 41 during the press-fitting process of the passive end 52 of the coupling 5 and the input end of the worm 2, and the passive end 52 of the coupling 5 is coaxial with the input end of the worm 2.
Further, when the two press-fitting components in the prior art are connected by the spline, the spline is easily damaged under the condition of extreme working conditions, such as the condition of large torque when the motor 1 is in a locked-rotor state, so that the power transmission between the two press-fitting components is influenced. In order to solve the problem, as shown in fig. 8, the elastic tolerance ring 40 according to the present embodiment further includes a plurality of deformation protrusions 42, and the plurality of deformation protrusions 42 are protruded on the outer circumferential surface of the correction body 41 at intervals and abut against the hole member.
The deformation convex part 42 is arranged, so that the friction torque between the two press-fitting parts can be increased, even if the two press-fitting parts slide relatively in the circumferential direction under the limit working condition, the elastic tolerance ring 40 can provide stable friction torque, and the normal transmission of the torque can be effectively ensured, so that the effect of protecting the connection between the two press-fitting parts is achieved, and the hole parts and the shaft parts are prevented from being damaged or slipping; the deformation protrusions 42 can also be used to absorb shock generated when the two press-fitting members are operated.
Alternatively, the deformation projection 42 includes a projection projecting from the inner circumferential surface to the outer circumferential surface of the deviation correcting body 41. Specifically, the inner circumferential surface of the deviation correcting body 41 is recessed toward the outer circumferential surface thereof to form a deformation groove 43, so that the outer circumferential surface of the deviation correcting body 41 is formed into a convex deformation protrusion 42. The deformation slots 43 may also provide room for elastic deformation of the elastic tolerance ring 40. Alternatively, the deformed groove 43 may have a sector, rectangular or trapezoidal cross section. Illustratively, the deformation groove 43 has a sector-shaped cross section. In other embodiments, the deformation protrusions 42 may be protruded from the inner circumferential surface of the deviation rectifying body 41 at intervals and abut against the shaft member, and the outer circumferential surface of the deviation rectifying body 41 is recessed toward the inner circumferential surface thereof to form the deformation groove 43, so that the inner circumferential surface of the deviation rectifying body 41 forms the protruded deformation protrusions 42.
By arranging the elastic tolerance ring 40 with the deformation convex parts 42 between the outer peripheral surface of the shaft part and the inner peripheral surface of the hole part, on one hand, the function of transmitting torque can be achieved by providing relatively large friction torque through the elastic tolerance ring 40, and on the other hand, under the limit working condition, when the transmission torque between the shaft part and the hole part is larger than the threshold value of the friction torque, even if the shaft part and the hole part can slide relatively along the circumferential direction, the friction torque can still keep a relatively stable value due to the elastic deformation of the elastic tolerance ring 40, so that the function of permanently protecting the connection of the two press-fitting parts is achieved.
Due to the difference in the dimensions of the respective deformation protrusions 42 due to the limitation in the machining accuracy, the hole type member is restricted from having a hardness less than that of the elastic tolerance ring 40, so that the deformation protrusions 42 are at least partially embedded in the hole type member. Optionally, the elastic tolerance ring 40 has a hardness greater than HRC 60.
When deformation convex part 42 is protruding to be located the outer peripheral surface of body 41 of rectifying, the pressure equipment in-process, along with the effort crescent between elastic tolerance ring 40 and the pressure equipment part, the inner peripheral surface of hole class part is under the extrusion, extrusion deformation will take place, so that deformation convex part 42 imbeds in the hole of hole class part, increase the friction torque between hole class part and the axle type part, can effectively solve two pressure equipment parts and easily lead to the problem that the cooperation performance of junction is weak when the creep condition is produced because of long-time operation, the connection stability of hole class part and axle type part has been improved, effectively avoided hole class part and axle type part to appear the not hard up phenomenon of moment of torsion transmission.
Further, the deformation protrusions 42 are elastically deformed during the press-fitting process, so that a certain pressure, friction force and friction torque are generated, and therefore, the number and shape and size of the deformation protrusions 42 directly affect the working effect thereof. To ensure that the resilient tolerance ring 40 has the proper press fit force and provides sufficient frictional torque, the radial thickness of the resilient tolerance ring 40 is between 2% and 5% of its inner diameter. Illustratively, the radial thickness of the elastic tolerance ring 40 is controlled to be between 0.4mm and 1.0mm when the inner diameter of the elastic tolerance ring 40 is 20 mm. Optionally, the radial thickness of the elastic tolerance ring 40 is any one of 2%, 2.5%, 3%, 3.5%, 4%, 4.5% and 5% of its inner diameter, preferably, the radial thickness of the elastic tolerance ring 40 is 2% of its inner diameter, and when the inner diameter of the elastic tolerance ring 40 is 20mm, the radial thickness of the elastic tolerance ring 40 is 0.4 mm.
In order to balance the relationship between the press-fitting force and the frictional torque, when the deformed convex portions 42 are provided on the outer peripheral surface of the elastic tolerance ring 40, the area occupied by the deformed convex portions 42 is 33% to 55% of the surface area of the inner peripheral surface of the elastic tolerance ring 40. The area occupied by the deformed convex portion 42 is the sum of the areas of the projections of the deformed convex portion 42 on the outer peripheral surface of the elastic tolerance ring 40. Alternatively, the area occupied by the deformed convex portions 42 is any one of 30%, 35%, 40%, 45%, 50% and 55% of the surface area of the outer peripheral surface of the elastic tolerance ring 40. The axial length of the deformed convex portion 42 is 1.2mm to 3.0mm, and the axial length of the deformed convex portion 42 may be any one of 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, and 3.0 mm. The circumferential width of the deformed convex portion 42 is 0.8mm to 2.0mm, and the circumferential width of the deformed convex portion 42 may be any one of 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, and 2.0 mm.
To ensure that the yield strength of the elastic tolerance ring 40 meets the requirements, in this embodiment, the yield strength of the material from which the elastic tolerance ring 40 is made is greater than 450 MPa. Illustratively, the elastic tolerance ring 40 is made of a high strength titanium alloy steel plate. In other embodiments, the elastic tolerance ring 40 can be made of other materials such as stainless steel, and the yield strength of the material of the elastic tolerance ring 40 is required to be greater than 450 MPa.
As shown in fig. 9, the elastic tolerance ring 40 is processed as follows: selecting a high-strength titanium alloy steel plate with the thickness of 0.5 mm; stamping the high-strength titanium alloy steel plate in a stamping mode, forming a deformation groove 43 on one side of the high-strength titanium alloy steel plate, and forming a deformation convex part 42 on the other side of the high-strength titanium alloy steel plate; cutting the punched steel plate; the cut steel plate is subjected to bending processing to obtain the elastic tolerance ring 40.
Exemplarily, as shown in fig. 2 to 5, an elastic tolerance ring 40 between an outer circumferential surface of the drive gear shaft 4 and an inner circumferential surface of the worm wheel 3 is referred to as a first elastic tolerance ring 401, and the assembly of the worm wheel 3 and the drive gear shaft 4 in the worm gear steering gear will be described below with reference to the drawings.
Be equipped with first spacing step on the drive gear axle 4, the cover is equipped with worm wheel 3 on the drive gear axle 4 of first spacing step one side, presss from both sides between the outer peripheral face of drive gear axle 4 and the inner peripheral surface of worm wheel 3 and establishes first elasticity tolerance ring 401, and first elasticity tolerance ring 401 and worm wheel 3 all butt in first spacing step to carry out axial spacing to first elasticity tolerance ring 401 and worm wheel 3. The driving gear shaft 4 of first spacing step opposite side goes up the cover and is equipped with self-aligning bearing 8, and exemplarily, self-aligning bearing 8 is the four point bearing, and self-aligning bearing 8 is equipped with the card and locates the bearing inner circle clamp 9 on the driving gear shaft 4 back to one side of first spacing step, and self-aligning bearing 8 presss from both sides and locates between first spacing step and the bearing inner circle clamp 9 to guarantee that driving gear shaft 4 smoothly rotates.
In the process of assembling the worm wheel 3 and the driving gear shaft 4, the first elastic tolerance ring 401 is firstly sleeved on the driving gear shaft 4 and the first elastic tolerance ring 401 is abutted against the first limit step; the worm wheel 3 is then press fitted onto the worm 2. Utilize first elasticity tolerance ring 401 to play the effect of self-centering to the assembly of worm wheel 3 and drive gear axle 4, rectify worm wheel 3 and drive gear axle 4, prevent to press partially, guarantee that worm wheel 3 and drive gear axle 4 are coaxial, improve the assembly precision of worm wheel 3 and drive gear axle 4, can play the effect that reduces worm wheel 3 and drive gear axle 4 transmission in-process moment of torsion undulant. In addition, because the first elastic tolerance ring 401 has elasticity, even if the worm wheel 3 and the driving gear shaft 4 generate relative sliding along the circumferential direction under the limit working condition, the torque transmission between the worm wheel and the driving gear shaft 4 is not damaged, the first elastic tolerance ring 401 can still provide stable friction torque, thereby playing a role of permanently protecting the connection between the worm wheel 3 and the driving gear shaft 4, and enabling the worm wheel and the driving gear shaft 4 to still normally transmit the torque. The arrangement of the first elastic tolerance ring 401 can also play a role in damping and noise reduction, and the NVH performance of the worm and gear steering engine is improved.
Exemplarily, as shown in fig. 6 and 7, the elastic tolerance ring 40 between the inner circumferential surface of the driven end 52 of the coupling 5 and the outer circumferential surface of the worm 2 is referred to as a second elastic tolerance ring 402, and the assembly of the motor 1 and the worm 2 in the worm and gear steering gear will be described below with reference to the drawings.
Each axial end of the worm 2 is provided with a step limiting surface back to the other end, wherein one end of the worm 2 connected with the motor 1 is provided with a first step limiting surface and a second step limiting surface, and the other end is provided with a third step limiting surface. The axial one end of worm 2 is equipped with big end bearing 6, and big end bearing 6 butt in the first step spacing face, and the driven end 52 of shaft coupling 5 is located on the worm 2 of first step spacing face one side and is butt in big end bearing 6, sets up second elasticity tolerance ring 402 between the inner peripheral surface of the driven end 52 of shaft coupling 5 and the outer peripheral surface of worm 2, and second elasticity tolerance ring 402 butt in the second step spacing face. The other end of the worm 2 is provided with a small end bearing 7, and the small end bearing 7 is abutted against the third step limiting surface.
The driving end 51 of the coupler 5 is connected to the output shaft 11 of the motor 1, and an elastic gasket 53 is arranged between the driven end 52 of the coupler 5 and the driving end 51 of the coupler 5.
By arranging the second elastic tolerance ring 402 between the passive end 52 of the coupling 5 and the input end of the worm 2, on one hand, the coupling 5 can be ensured to stably transmit torque from the output shaft 11 of the motor 1 to the input end of the worm 2, and the assembly precision between the passive end 52 of the coupling 5 and the input end of the worm 2 can be improved. In addition, because the second elastic tolerance ring 402 can be elastically deformed, even if the driven end 52 of the coupling 5 and the input end of the worm 2 slide relative to each other in the circumferential direction under extreme working conditions, torque transmission between the driven end 52 of the coupling 5 and the input end of the worm 2 is not damaged, the second elastic tolerance ring 402 can still provide stable friction torque, so that the connection between the driven end 52 of the coupling 5 and the input end of the worm 2 is permanently protected, and the motor 1 can still transmit torque to the worm 2 through the coupling 5; the second elastic tolerance ring 402 can also play a role in damping and reducing noise, so that the NVH performance of the worm and gear steering engine is improved.
In other embodiments, an elastic tolerance ring 40 may also be arranged between the driving end 51 of the coupling 5 and the output shaft 11 of the motor 1; it is also possible to dispense with the coupling 5 and to connect the input of the worm 2 directly to the output shaft 11 of the motor 1.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "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 device or element being 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 the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
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.

Claims (15)

1. A coaxiality adjusting device is connected with two press-fitting parts, wherein the two press-fitting parts are respectively a hole part and a shaft part, and the hole part is sleeved outside the shaft part;
characterized in that, the axiality adjusting device includes:
an elastic tolerance ring (40), wherein the elastic tolerance ring (40) is clamped between the inner peripheral surface of the hole part and the outer peripheral surface of the shaft part;
the resilient tolerance ring (40) is configured to be resiliently deformable in a radial direction during press-fitting to permit oscillation of one of the press-fitting components until coaxial with the other of the press-fitting components.
2. The coaxiality adjustment apparatus according to claim 1, wherein the elastic tolerance ring (40) is provided with a deformation space (44), and the deformation space (44) is used for providing a space for elastic deformation of the elastic tolerance ring (40) during press fitting.
3. The coaxiality adjustment device according to claim 2, wherein the elastic tolerance ring (40) comprises:
the correcting device comprises a correcting body (41), wherein the correcting body (41) is a C-shaped ring, and the deformation space (44) is an axial opening in the periphery of the C-shaped ring.
4. The coaxiality adjustment apparatus according to claim 3, wherein the elastic tolerance ring (40) further includes:
a plurality of deformation convex parts (42) which are arranged on the outer peripheral surface of the deviation rectifying body (41) in a protruding mode at intervals and are abutted with the hole parts; and/or the deviation correcting body is arranged on the inner circumferential surface of the deviation correcting body (41) in a protruding mode at intervals and is abutted to the shaft part.
5. The coaxiality adjusting apparatus according to claim 4, wherein the deformation protrusion (42) includes a projection projecting from an inner peripheral surface to an outer peripheral surface of the correcting body (41);
and/or the presence of a gas in the gas,
and the bulges protrude from the outer peripheral surface to the inner peripheral surface of the deviation rectifying body (41).
6. The coaxiality adjustment device according to claim 5, wherein the elastic tolerance ring (40) has a radial thickness comprised between 2% and 5% of its inner diameter.
7. The coaxiality adjustment apparatus according to claim 5, wherein a bottom of the deformation protrusion (42) is formed with a deformation groove (43), and a cross section of the deformation groove (43) is fan-shaped, rectangular, or trapezoidal.
8. The coaxiality adjusting apparatus according to claim 7, wherein the deformation groove (43) has a sector-shaped cross section, the deformation protrusion (42) has an axial length of 1.2mm to 3.0mm, and the deformation protrusion (42) has a circumferential arc length of 0.8mm to 2.0 mm.
9. Coaxiality adjustment arrangement according to claim 4, characterized in that the deformation projections (42) are at least partially embedded in the press-fit part.
10. The coaxiality adjustment apparatus according to claim 9, wherein the press-fitting member in which the deformation projections (42) are embedded has a hardness smaller than that of the elastic tolerance ring (40).
11. The coaxiality adjusting apparatus according to claim 4, wherein the deformation protrusion (42) is provided on an inner peripheral surface of the elastic tolerance ring (40), and a footprint of the deformation protrusion (42) is 33% to 55% of a surface area of the inner peripheral surface of the elastic tolerance ring (40);
alternatively, the first and second electrodes may be,
the deformation convex part (42) is arranged on the outer peripheral surface of the elastic tolerance ring (40), and the occupied area of the deformation convex part (42) is 33% -55% of the surface area of the outer peripheral surface of the elastic tolerance ring (40).
12. Coaxiality adjustment device according to any one of claims 1 to 11, wherein the yield strength of the material from which the elastic tolerance ring (40) is made is greater than 450 MPa.
13. A worm gear steering machine comprising:
a drive unit;
the input end of the worm (2) is connected with the output shaft of the driving unit through a coupler (5), and the driving unit is used for driving the worm (2) to rotate;
the worm wheel (3), the worm wheel (3) is meshed with the worm (2), and the worm wheel (3) is connected with a driving gear shaft (4);
it is characterized in that the preparation method is characterized in that,
further comprising a coaxiality adjustment apparatus according to any one of claims 1 to 12;
the elastic tolerance ring (40) is arranged between the input end of the worm (2) and the passive end (52) of the coupler (5);
and/or the elastic tolerance ring (40) is arranged between the drive gear shaft (4) and the worm gear (3);
and/or the elastic tolerance ring (40) is arranged between the output shaft of the driving unit and the driving end (51) of the coupler (5).
14. A worm gear steering machine comprising:
a drive unit;
the input end of the worm (2) is connected with the output shaft of the driving unit, and the driving unit is used for driving the worm (2) to rotate;
the worm wheel (3), the worm wheel (3) is meshed with the worm (2), and the worm wheel (3) is connected with a driving gear shaft (4);
it is characterized in that the preparation method is characterized in that,
further comprising a coaxiality adjustment apparatus according to any one of claims 1 to 12;
the elastic tolerance ring (40) is arranged between the input end of the worm (2) and the output shaft of the driving unit;
and/or the elastic tolerance ring (40) is arranged between the drive gear shaft (4) and the worm wheel (3).
15. An assembling apparatus for assembling the coaxiality adjusting apparatus according to any one of claims 1 to 12; the assembling apparatus includes:
the first clamping structure is used for clamping one press-mounting component in the coaxiality adjusting device;
a second clamping structure for clamping the other press fitting component of the coaxiality adjusting device, one of the first clamping structure and the second clamping structure being capable of swinging;
and the press fitting machine is used for driving the first clamping structure to drive the clamped press fitting parts to axially approach to the other press fitting part so as to sleeve the hole parts outside the shaft parts, and the elastic tolerance ring (40) is clamped between the outer peripheral surfaces of the shaft parts and the inner peripheral surfaces of the hole parts.
CN202111444166.9A 2021-11-30 2021-11-30 Axiality adjusting device, worm gear steering gear and assembly quality Active CN114131311B (en)

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CN114744824A (en) * 2022-05-11 2022-07-12 星河智源(深圳)科技有限公司 Energy-saving and environment-friendly intelligent output motor capable of independently controlling rotating speed
CN115070383A (en) * 2022-06-13 2022-09-20 东风柳州汽车有限公司 Lower C ring press-fitting mechanism and coupling assembling tool
CN115194443A (en) * 2022-06-13 2022-10-18 东风柳州汽车有限公司 Go up C ring press fitting mechanism and shaft coupling assembly fixture

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CN108772680A (en) * 2018-08-01 2018-11-09 昆山捷云智能装备有限公司 Adaptive pressing machine, automation press mounting system and its pressing method
WO2021139916A1 (en) * 2020-01-11 2021-07-15 Robert Bosch Gmbh Worm drive
CN113586667A (en) * 2021-07-30 2021-11-02 中汽创智科技有限公司 Worm gear mechanism and electric power steering system

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JP2002087294A (en) * 2000-09-11 2002-03-27 Nsk Ltd Electric power steering device
CN101255884A (en) * 2007-02-20 2008-09-03 兰科容隙环有限公司 Mounting assembly
CN108772680A (en) * 2018-08-01 2018-11-09 昆山捷云智能装备有限公司 Adaptive pressing machine, automation press mounting system and its pressing method
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* Cited by examiner, † Cited by third party
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CN114744824A (en) * 2022-05-11 2022-07-12 星河智源(深圳)科技有限公司 Energy-saving and environment-friendly intelligent output motor capable of independently controlling rotating speed
CN115070383A (en) * 2022-06-13 2022-09-20 东风柳州汽车有限公司 Lower C ring press-fitting mechanism and coupling assembling tool
CN115194443A (en) * 2022-06-13 2022-10-18 东风柳州汽车有限公司 Go up C ring press fitting mechanism and shaft coupling assembly fixture
CN115070383B (en) * 2022-06-13 2023-06-06 东风柳州汽车有限公司 Lower C ring press-fitting mechanism and coupler assembly fixture
CN115194443B (en) * 2022-06-13 2023-06-06 东风柳州汽车有限公司 Go up C ring pressure equipment mechanism and shaft coupling assembly fixture

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