CN111609121A - Gear rack steering gear backlash eliminating device and damping and limiting method thereof - Google Patents
Gear rack steering gear backlash eliminating device and damping and limiting method thereof Download PDFInfo
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- CN111609121A CN111609121A CN202010254803.5A CN202010254803A CN111609121A CN 111609121 A CN111609121 A CN 111609121A CN 202010254803 A CN202010254803 A CN 202010254803A CN 111609121 A CN111609121 A CN 111609121A
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- hole
- support yoke
- gasket
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
- F16H2057/126—Self-adjusting during operation, e.g. by a spring
- F16H2057/127—Self-adjusting during operation, e.g. by a spring using springs
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a gear rack steering gear gap eliminating device and a damping and limiting method thereof, the device comprises a steering gear shell, a gear rack assembly and a support yoke, the gear rack assembly comprises a gear shaft which is rotatably supported on the steering gear shell, a gear which is connected with the gear shaft and a rack which is meshed with the gear, a gap adjusting cavity is correspondingly arranged below the rack of the steering gear shell, the support yoke is movably arranged in the gap adjusting cavity and is abutted against the back surface of the rack, an adjusting screw plug is arranged at the lower opening part of the gap adjusting cavity, a disc spring group is arranged between the adjusting screw plug and the support yoke, and the disc spring group comprises at least two overlapped disc springs. The invention adopts the disc spring group as an elastic body, and the disc springs can provide approximately consistent rigidity within a certain compression range through the arrangement form of involution and series connection of the two groups of disc springs, so that the pressing force on the rack is kept basically unchanged after being worn, and the pressing effect and the stability are further improved.
Description
Technical Field
The invention belongs to the technical field of automobile parts, and particularly relates to a steering gear.
Background
The steering gear is a speed reduction transmission device in a steering system and generally comprises a 1-2 stage speed reduction transmission pair; according to different structural forms of a transmission pair, the steering gear can be divided into a plurality of types, and the steering gear is widely used in automobiles at present and comprises a rack and pinion type, a circulating ball-rack toothed sector type, a circulating ball-crank finger pin type and the like. Among them, rack and pinion steering is the most common type of steering; a steering gear as a driving sub-driving member of the rack and pinion steering gear is mounted in a housing to be engaged with a steering rack arranged horizontally. The spring presses the rack against the steering gear by means of a pressure piece to ensure a play-free engagement. When the steering rack works, the middle part of the steering rack is connected with the steering pull rod bracket, and the steering left and right tie rods are connected with the steering knuckle arm. When the steering wheel is rotated, the steering gear is transferred to enable the steering rack meshed with the steering gear to move along the axial direction, so that the left and right tie rods drive the left and right steering knuckles to transfer, the steering wheel is deflected, and the steering of the automobile is realized.
The gap eliminating device adopted by the existing gear rack steering gear is mainly pressed by a spiral spring, and the pressing force of the spiral spring is in a linear relation with the compression amount, so that the pressing force is reduced along with the abrasion of a gear and a rack, and the stability of the performance of a product is not favorably kept; meanwhile, the existing steering gear product is lack of a damping structure inside, and when the steering gear runs on a bumpy road section, vibration transmitted to the steering gear cannot be effectively attenuated, so that steering system noise is caused, and the driving experience of a vehicle is reduced; the problems of knocking, tooth jumping and the like can also occur seriously, the steering system can be damaged in an extreme state, and potential safety hazards are brought to driving.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a gear rack steering gear backlash eliminating device, which can effectively compensate the backlash caused by normal working abrasion of a gear and a rack and avoid that the pressing force on the rack is reduced along with the abrasion of the gear and the rack.
In order to solve the technical problems, the invention adopts the following technical scheme: the gear rack steering gear backlash eliminating device comprises a steering gear shell, a gear rack assembly and a support yoke, wherein the gear rack assembly comprises a gear shaft, a gear and a rack, the gear shaft is rotatably supported on the steering gear shell, the gear is connected with the gear shaft, and the rack is meshed with the gear, the steering gear shell is correspondingly provided with a clearance adjusting cavity below the rack, the support yoke is movably arranged in the clearance adjusting cavity and abuts against the back of the rack, an adjusting plug screw is arranged at the lower opening of the clearance adjusting cavity, a disc spring group is arranged between the adjusting plug screw and the support yoke, and the disc spring group comprises at least two overlapped disc springs.
Preferably, the disc spring group comprises two groups of disc springs, each group of disc springs comprises two disc springs which are overlapped and connected in parallel, and the two groups of disc springs are connected in a closing and series connection mode.
Preferably, the support yoke is provided with a hole, the hole comprises a hole opening part positioned on the lower side of the support yoke, the adjusting screw plug is provided with a first sliding column in sliding fit with the hole opening part, and the lower end of the disc spring group is abutted against the top end of the first sliding column.
Preferably, the hole still includes the hole middle part that is located the orifice portion top, the diameter at hole middle part is less than the orifice portion, forms hole step face one between orifice portion and hole middle part, the upper end of slip post one is connected with hole middle part sliding fit's slip post two, the hole nestification of dish spring group is in slip post two, and the upper end of dish spring group offsets with hole step face one.
Preferably, at least one supporting yoke sealing ring matched with the inner wall of the clearance adjusting cavity is installed on the outer cylindrical surface of the supporting yoke, and at least one adjusting screw plug sealing ring matched with the inner wall of the opening part is installed on the outer cylindrical surface of the first sliding column.
Preferably, the upper end of the second sliding column is connected with a composite limiting gasket and a compression screw, the hole further comprises a hole upper portion located above the middle portion of the hole, a second hole step surface is formed between the middle portion of the hole and the hole upper portion, the composite limiting gasket comprises a gasket inner ring and a gasket outer ring which are fixed into a whole, the gasket outer ring is an elastic body, the lower surface of the gasket inner ring is in contact with the upper end surface of the second sliding column, the upper surface of the gasket inner ring is in contact with the lower surface of the head of the compression screw, the upper surface of the gasket outer ring is higher than the upper surface of the gasket inner ring and has a movable gap with the hole step surface II, and.
Preferably, the inner ring of the gasket is made of metal, the outer ring of the gasket is made of rubber, and the outer ring of the gasket is embedded on the inner ring of the gasket.
Preferably, in an unworn state of the rack and pinion, the clearance is not less than one third of the height of the rack and pinion teeth.
The invention also provides a damping method of the gear rack steering gear backlash eliminating device, which comprises the following steps:
1) when the vehicle runs on a bumpy road surface, the rack is excited by the road surface, and the rack has a bouncing tendency;
2) the rack extrudes the disc spring group through the support yoke, the disc spring group is pressed to deform and recover, and the support yoke vibrates;
3) in the vibration process of the support yoke, the support yoke moves relative to the steering gear shell, at the moment, the support yoke sealing ring generates a friction force opposite to the movement direction of the support yoke, energy is dissipated through friction damping, and vibration is attenuated;
4) in the vibration process of the support yoke, the relative adjustment screw plug moves, the adjustment screw plug sealing ring generates a friction force opposite to the movement direction of the support yoke, and the energy is dissipated through friction damping to attenuate the vibration;
5) the supporting yoke is in the vibration in-process, and dish spring group is constantly compressed and is resumeed under self elasticity effect, and the contact surface between the dish spring produces relative displacement and looks mutual friction, dissipates the energy through friction damping, damping attenuation vibration.
The invention also provides a limiting method of the gear rack steering gear backlash eliminating device, when the rack vibrates violently, the step surface II of the hole on the supporting yoke is matched with the gasket outer ring of the composite limiting gasket for limiting, so that the maximum displacement of the supporting yoke and the rack is limited.
The technical scheme adopted by the invention has the following beneficial effects:
because the disc spring group is used as the elastic body, the disc springs can provide approximately consistent rigidity within a certain compression range through the arrangement form of involution and series connection of the two groups of disc springs, so that the pressing force on the rack is kept basically unchanged after being worn, and the pressing effect and the stability are further improved.
Because each group of disc springs comprises two disc springs which are overlapped and connected in parallel, when vibration occurs, the friction between the disc springs can play a damping role. In addition, the support yoke moves relative to the steering gear shell in the vibration process, at the moment, the first support yoke sealing ring and the second support yoke sealing ring generate friction force opposite to the movement direction of the support yoke, and energy is dissipated through friction damping to attenuate vibration; in the vibration process of the support yoke, the relative adjustment screw plug moves, the adjustment screw plug sealing ring generates a friction force opposite to the movement direction of the support yoke, and energy is dissipated through friction damping to attenuate vibration. Under the action of the friction damping, the vibration on the bumpy road surface can be effectively attenuated.
When the rack vibrates excessively, the outer ring of the rubber gasket of the composite limiting gasket can play a limiting role, so that knocking sound or tooth jumping of the rack due to excessive vibration is avoided, and meanwhile, the inner ring of the metal gasket passing through the composite limiting gasket is fixed, so that the problem of torque attenuation under a vibration working condition is effectively solved.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic view of a rack and pinion steering gear disc spring anti-backlash device;
FIG. 2 is a partial enlarged view of a disc spring set structure of a disc spring backlash elimination device of a rack and pinion steering gear;
FIG. 3 is a part diagram of a composite limit gasket of a disc spring backlash elimination device of a rack and pinion steering gear.
Fig. 4 is a graph of compression versus force for a disc spring stack.
In the figure, a steering gear housing 1, a gear shaft 2, a rack 3, a support yoke 4, a hole opening 41, a hole middle part 42, a hole upper part 43, an antifriction and shock absorption layer 44, a first support yoke seal ring 5, a second support yoke seal ring 6, a disc spring group 7, an adjusting screw plug seal ring 8, a fixing nut 9, an adjusting screw plug 10, a sliding column I101, a sliding column II 102, a compression screw 11, a compression screw head part 111, a composite limit gasket 12, a gasket inner ring 121, a flange 1211, a gasket outer ring 122, a first support bearing 13 and a second support bearing 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Such terms as "upper", "lower", and the like, indicating an orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation and therefore should not be construed as limiting the present invention.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
Referring to fig. 1 to 4, a rack and pinion steering anti-backlash device includes: the steering gear comprises a steering gear shell 1, a gear shaft 2, a rack 3, a support yoke 4, a first support yoke sealing ring 5, a second support yoke sealing ring 6, a disc spring group 7, an adjusting screw plug sealing ring 8, a fixing nut 9, an adjusting screw plug 10, a compression screw 11, a composite limiting gasket 12, a first support bearing 13 and a second support bearing 14.
The gear shaft 2 is assembled inside the steering gear housing 1 via the first support bearing 13 and the second support bearing 14, and in the present embodiment, a gear is integrally formed on the gear shaft 2. One side of the rack 3 with teeth is matched with the gear on the gear shaft 2, the other side of the rack 3 is provided with an arc-shaped part, the supporting yoke 4 is correspondingly provided with an arc-shaped groove matched with the arc-shaped part, and the surface of the arc-shaped groove is provided with an antifriction and shock absorption layer 44.
The steering gear shell 1 is correspondingly provided with a gap adjusting cavity below the rack, the supporting yoke 4 is movably arranged in the gap adjusting cavity and is abutted against the back of the rack, an adjusting screw plug 10 is arranged at the lower opening part of the gap adjusting cavity, and a disc spring group 7 is arranged between the adjusting screw plug and the supporting yoke. An adjusting screw plug 10 is screwed into the steering gear housing 1 from the lower mouth portion of the clearance adjusting chamber and presses the support yoke 4 via a disc spring group 7, and a fixing nut 9 is screwed into and pressed against the lower end of the steering gear housing 1 from the lower end of the adjusting screw plug 10.
The supporting yoke 4 is provided with a hole, the hole comprises a hole part 41 positioned on the lower side of the supporting yoke, the adjusting screw plug is provided with a first sliding column 101 in sliding fit with the hole part 41, and the lower end of the disc spring group 7 is abutted against the top end of the first sliding column 101. The hole further comprises a hole middle part 42 located above the hole opening part 41, the diameter of the hole middle part 42 is smaller than that of the hole opening part 41, and a first hole step surface is formed between the hole opening part 41 and the hole middle part 42. In order to provide guidance for the disc spring group 7, the upper end of the first sliding column 101 is connected with a second sliding column 102 in sliding fit with the hole middle part 42, an inner hole of the disc spring group 7 is nested in the second sliding column 102, and the upper end of the disc spring group abuts against the hole step surface I.
At least one sealing ring matched with the inner wall of the clearance adjusting cavity is arranged on the outer cylindrical surface of the supporting yoke 4, and the number of the sealing rings is two, namely a first supporting yoke sealing ring 5 and a second supporting yoke sealing ring 6. And at least one sealing ring matched with the inner wall of the orifice part 41, namely an adjusting screw plug sealing ring 8 in the embodiment, is arranged on the outer cylindrical surface of the first sliding column 101. In the vibration process of the support yoke 4, the support yoke moves relative to the steering gear shell 1, at the moment, the first support yoke sealing ring 5 and the second support yoke sealing ring 6 generate friction force opposite to the movement direction of the support yoke 4, and energy is dissipated through friction damping to damp vibration; therefore, 2 sealing rings are used, and the number is not simply increased; through the use of 2 sealing rings, the swing of the supporting yoke 4 after receiving impact can be effectively limited, so that the beneficial effect of reducing knocking noise is achieved. In addition, in the vibration process of the support yoke 4, the relative adjusting screw plug 10 moves, at the moment, the adjusting screw plug sealing ring 8 generates a friction force opposite to the movement direction of the support yoke 4, and energy is dissipated through friction damping to damp vibration. Under the action of the friction damping, the vibration on the bumpy road surface can be effectively attenuated.
Referring to fig. 1 and 2, the disc spring set 7 includes two sets of disc springs, each set of disc springs includes two disc springs stacked and connected in parallel, and the two sets of disc springs are connected in series by involution. The disc spring type is a C-type disc spring specified in GB/T1972-2005, and the total compression amount of the disc spring group 7 is 60% -70% of the free height of a single disc spring in the state that the gear rack is not worn. As shown in FIG. 4, when two groups of C-type disc springs are installed in the above manner, when the compression amount is in the range of 40% -70% of the free height of a single disc spring, the approximately constant rigidity characteristic can be generated, and by utilizing the characteristic, the disc spring group can be ensured to still keep the pressing force from being obviously attenuated after compensating the gap of the abrasion of the gear and the rack, so that the stability and the reliability of the pressing are improved. Wherein, the number of the disc spring groups can be changed according to the actual requirement,
it should be emphasized that the present invention is not simply a disc spring instead of a coil spring, because a single disc spring is not used, but an integral disc spring set is used, and the disc spring set adopts a combination of involution and folding. Wherein:
1. after the disc spring combination is installed in an involutory mode, the rigidity of the disc spring combination has a nonlinear characteristic, and the fact that the pressing force of the gear rack is basically unchanged after the gear rack is abraded is guaranteed;
2. after the disc spring group is installed in an overlapped mode, when the disc springs are compressed by external force, friction between the disc springs can play a damping role, and vibration is attenuated.
The above functions can be realized only by adopting a superposition and involution installation mode for the disc spring; if the traditional spiral spring is directly replaced by the single disc spring, the purpose cannot be achieved.
As shown in fig. 1 and 3, based on the technical characteristic of the second sliding column 102 matched with the inner hole of the disc spring group 7, in order to limit the maximum displacement of the support yoke 4 and the rack 3, a composite limit gasket 12 and a compression screw 11 are further provided, and the composite limit gasket 12 is fixed at the upper end of the second sliding column 102 through the compression screw 11.
Wherein the hole further includes a hole upper portion 43 located above the hole middle portion 42, the hole upper portion 43 penetrates the support yoke 4, the diameter of the head portion 111 of the pressing screw is smaller than that of the hole upper portion to form a clearance fit, and a second step surface is formed between the hole middle portion 42 and the hole upper portion 43. The composite limiting gasket 12 comprises a gasket inner ring 121 and a gasket outer ring 122 which are fixed into a whole, the gasket outer ring 122 is an elastic body, the lower surface of the gasket inner ring 121 is in contact with the upper end face of the sliding column II, the upper surface of the gasket inner ring 121 is in contact with the lower surface of the head part 111 of the compression screw, the upper surface of the gasket outer ring 122 is higher than the upper surface of the gasket inner ring 121 and has a movable gap with the hole step surface II, and the lower surface of the gasket inner ring 121 is flush with the lower surface of the gasket outer.
Preferably, the gasket inner ring 121 is made of metal, the gasket outer ring 122 is made of rubber, and the gasket outer ring 122 is embedded on the gasket inner ring 121. The gasket inner ring 121 is arranged in an inner hole of the gasket outer ring 122, the inner hole of the gasket outer ring 122 is provided with an embedded groove, the outer edge of the upper end of the gasket inner ring is provided with a flange 1211, and the flange 1211 is embedded in the embedded groove.
Under the state that the gear rack is not abraded, the height of the movable gap (the distance between the upper surface of the gasket outer ring and the step surface II of the hole) is not less than one third of the tooth height of the gear and the rack 3 on the gear shaft 2. The purpose of limiting is to avoid the problem of tooth jumping of the gear rack under the limit working condition; ideally, there should be no gap in this area. However, one third of the tooth height (empirical value) is left, due to the machining tolerances between the different parts, taking into account the part fit and, in the case of part tolerances, the adjustment of the pretension of the entire support system.
The outer ring of the composite limiting gasket 12 is made of rubber, so that direct contact between metal parts is avoided, the possibility of occurrence of knocking noise is reduced, and a certain damping effect can be achieved. For the material of the rubber material, on the basis of meeting the requirements of strength, temperature and lubricating grease resistance, the wear resistance is stronger, and fluororubber is generally preferred. Meanwhile, the composite limiting gasket 12 is fixed through the gasket inner ring 121, the pressing force of the pressing screw 11 acts on a metal part, and compared with a rubber part, the problem of torque attenuation failure under the vibration working condition is effectively solved.
A limiting method of a gear rack steering gear backlash eliminating device is characterized in that when a rack 3 vibrates violently, a step surface II of a hole in a support yoke 4 impacts a gasket outer ring 122 of a composite limiting gasket 12, and therefore the maximum displacement of the support yoke 4 and the rack 3 is limited.
The damping method of the disc spring backlash eliminating device of the rack and pinion steering gear comprises the following steps:
1) when the vehicle runs on a bumpy road, the rack 3 is excited by the road, and the jumping tendency appears;
2) the rack 3 extrudes the disc spring group 7 through the support yoke 4, the disc spring group 7 is pressed to deform and recover, and the support yoke 4 vibrates;
3) in the vibration process of the support yoke 4, the support yoke moves relative to the steering gear shell 1, at the moment, the first support yoke sealing ring 5 and the second support yoke sealing ring 6 generate friction force opposite to the movement direction of the support yoke 4, and energy is dissipated through friction damping to damp vibration;
4) in the vibration process of the support yoke 4, the relative adjustment screw plug 10 moves, at the moment, the adjustment screw plug sealing ring 8 generates a friction force opposite to the movement direction of the support yoke 4, energy is dissipated through friction damping, and vibration is attenuated;
5) support yoke 4 is in the vibration process, and dish spring group 7 constantly is compressed and is resumeed under self elasticity effect, because dish spring group 7 has two sets of coincide parallelly connected dish spring combinations to form, and the contact surface between the dish spring produces relative displacement and looks mutual friction, through friction damping dissipation energy, damping vibration.
The invention is suitable for eliminating the fit clearance generated after the gear rack steering gear is worn in normal use, and simultaneously plays roles of damping and limiting when the vehicle runs on a bumpy road; in addition, the invention has the advantages of simple structure, reliable work, simple processing, low cost and the like, and is suitable for eliminating the clearance of various gear rack steering machines.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. The gear rack steering gear backlash eliminating device comprises a steering gear shell, a gear rack assembly and a support yoke, wherein the gear rack assembly comprises a gear shaft, a gear and a rack, the gear shaft is rotatably supported on the steering gear shell, the gear is connected with the gear shaft, the rack is meshed with the gear, a backlash adjusting cavity is correspondingly arranged below the rack of the steering gear shell, and the support yoke is movably arranged in the backlash adjusting cavity and abuts against the back surface of the rack, and is characterized in that: the lower oral area in clearance adjustment chamber is installed and is adjusted the plug screw, it is equipped with dish spring group to adjust between plug screw and the support yoke, dish spring group includes two piece at least coincide dish springs.
2. The rack and pinion steering gear backlash elimination device of claim 1, wherein: the disc spring group comprises two groups of disc springs, each group of disc springs comprises two disc springs which are overlapped and connected in parallel, and the two groups of disc springs are connected in a butt-joint series connection mode.
3. The rack and pinion steering gear backlash elimination device of claim 1, wherein: the support yoke is provided with a hole, the hole comprises a hole opening part positioned on the lower side of the support yoke, the adjusting screw plug is provided with a first sliding column in sliding fit with the hole opening part, and the lower end of the disc spring group is abutted to the top end of the first sliding column.
4. The rack and pinion steering gear backlash elimination device of claim 3, wherein: the hole is still including the hole middle part that is located the orifice portion top, the diameter at hole middle part is less than the orifice portion, forms hole step face one between orifice portion and hole middle part, the upper end of slip post one is connected with hole middle part sliding fit's slip post two, the hole nestification of dish spring group is in slip post two, and the upper end of dish spring group offsets with hole step face one.
5. The rack and pinion steering gear backlash elimination device of claim 4, wherein: and the outer cylindrical surface of the first sliding column is provided with at least one adjusting screw plug sealing ring matched with the inner wall of the opening part.
6. The rack and pinion steering gear backlash elimination device of claim 4 or 5, wherein: the upper end of sliding column II is connected with compound spacing gasket and housing screw, the hole is still including the hole upper portion that is located hole middle part top, forms hole step face two between hole middle part and hole upper portion, compound spacing gasket is including fixed as an organic whole gasket inner circle and gasket outer lane, the gasket outer lane is the elastomer, gasket inner circle lower surface and sliding column two's up end contact, gasket inner circle upper surface with compress tightly screwhead portion lower surface contact, gasket outer lane upper surface be higher than gasket inner circle upper surface and with hole step face two between have a clearance, gasket inner circle lower surface and gasket outer lane lower surface parallel and level.
7. The rack and pinion steering gear backlash elimination device of claim 6, wherein: the gasket inner ring is made of metal, the gasket outer ring is made of rubber, and the gasket outer ring is embedded on the gasket inner ring.
8. The rack and pinion steering gear backlash elimination device of claim 6, wherein: in the unworn state of the rack and pinion, the clearance is not less than one third of the height of the rack and pinion teeth.
9. The damping method of the gear rack steering gear backlash eliminating device is characterized by comprising the following steps of:
1) when the vehicle runs on a bumpy road surface, the rack is excited by the road surface, and the rack has a bouncing tendency;
2) the rack extrudes the disc spring group through the support yoke, the disc spring group is pressed to deform and recover, and the support yoke vibrates;
3) in the vibration process of the support yoke, the support yoke moves relative to the steering gear shell, at the moment, the support yoke sealing ring generates a friction force opposite to the movement direction of the support yoke, energy is dissipated through friction damping, and vibration is attenuated;
4) in the vibration process of the support yoke, the relative adjustment screw plug moves, the adjustment screw plug sealing ring generates a friction force opposite to the movement direction of the support yoke, and the energy is dissipated through friction damping to attenuate the vibration;
5) the supporting yoke is in the vibration in-process, and dish spring group is constantly compressed and is resumeed under self elasticity effect, and the contact surface between the dish spring produces relative displacement and looks mutual friction, dissipates the energy through friction damping, damping attenuation vibration.
10. The limiting method of the gear rack steering gear backlash eliminating device is characterized in that: when the rack vibrates violently, the step surface II of the upper hole of the support yoke is matched with the outer ring of the gasket of the composite limiting gasket for limiting, so that the maximum displacement of the support yoke and the rack is limited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254803.5A CN111609121A (en) | 2020-04-02 | 2020-04-02 | Gear rack steering gear backlash eliminating device and damping and limiting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254803.5A CN111609121A (en) | 2020-04-02 | 2020-04-02 | Gear rack steering gear backlash eliminating device and damping and limiting method thereof |
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| CN111609121A true CN111609121A (en) | 2020-09-01 |
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| CN202010254803.5A Pending CN111609121A (en) | 2020-04-02 | 2020-04-02 | Gear rack steering gear backlash eliminating device and damping and limiting method thereof |
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| Country | Link |
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| CN (1) | CN111609121A (en) |
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| CN113184045A (en) * | 2021-06-08 | 2021-07-30 | 衢州职业技术学院 | Electric power steering system and clearance adjusting method thereof |
| CN113184041A (en) * | 2021-06-08 | 2021-07-30 | 衢州职业技术学院 | Electric power steering system with clearance compensation mechanism |
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| CN212297543U (en) * | 2020-04-02 | 2021-01-05 | 浙江万达汽车方向机股份有限公司 | Automatic clearance eliminating device for gear rack steering gear |
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| GB719389A (en) * | 1951-09-10 | 1954-12-01 | Qualcraft General Engineering | Improvements in or relating to sealing and damping devices for pistons |
| CN101734276A (en) * | 2008-11-18 | 2010-06-16 | 万都株式会社 | Rack bar supporting device and vehicle steering apparatus with the same |
| CN202371114U (en) * | 2011-12-24 | 2012-08-08 | 山东普利森集团有限公司 | Transmission gap regulation mechanism for double-gear output speed reducer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113184045A (en) * | 2021-06-08 | 2021-07-30 | 衢州职业技术学院 | Electric power steering system and clearance adjusting method thereof |
| CN113184041A (en) * | 2021-06-08 | 2021-07-30 | 衢州职业技术学院 | Electric power steering system with clearance compensation mechanism |
| CN113184045B (en) * | 2021-06-08 | 2022-10-21 | 衢州职业技术学院 | Electric power steering system and clearance adjusting method thereof |
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Address after: 311258 No. 28, Xiangshan Road, Wenyan street, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant after: ZHEJIANG WANDA STEERING GEAR Co.,Ltd. Address before: No.28 Xiangshan Road, Wenyan Town, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant before: ZHEJIANG WANDA STEERING GEAR CO.,LTD. |