CN112829825A - Rocker shaft boosting type circulating ball electric power steering gear - Google Patents
Rocker shaft boosting type circulating ball electric power steering gear Download PDFInfo
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- CN112829825A CN112829825A CN202110277662.3A CN202110277662A CN112829825A CN 112829825 A CN112829825 A CN 112829825A CN 202110277662 A CN202110277662 A CN 202110277662A CN 112829825 A CN112829825 A CN 112829825A
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- worm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0445—Screw drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0454—Worm gears
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention relates to an automobile power-assisted steering device, which comprises a steering device main body, wherein the steering device main body comprises a screw nut assembly, a transmission shaft worm wheel assembly in transmission connection with the screw nut assembly, and a worm transmission assembly in transmission connection with the transmission shaft worm wheel assembly; the transmission shaft worm gear component comprises a worm gear shaft, and a sector gear connected with the screw nut assembly is arranged on the worm gear shaft; a worm wheel arranged on the worm wheel shaft is connected with a driving motor for providing power for the automobile power-assisted steering gear through a worm transmission assembly; the screw nut assembly comprises a steering screw rod, a steering nut meshed with the sector gear is sleeved on the steering screw rod, a channel for rolling a steel ball is formed between the inner wall of the steering nut and the tooth groove of the steering screw rod, and a guide pipe communicated with the channel is arranged on the steering nut. By the aid of the automobile power-assisted steering device, the steering device in the scheme has a more flexible arrangement mode, and is more suitable for large heavy-load vehicles.
Description
Technical Field
The invention relates to a rocker shaft assisted type recirculating ball electric power steering gear.
Background
The electric power steering system appears at the end of the last eighties in the world, and in the rapid development of the electronic aspect, the electric power steering system is taken as a representative of electromechanical integration, a motor and an electronic device are combined, so that the convenience and applicability of operation of a driver are met, the grasp of road feel is improved, the driving system of an automobile is actively improved, and the automobile electric power steering system is formed by additionally arranging an electronic control servo system on the basis of a mechanical steering gear (mostly in a gear-rack type for a car). The system mainly comprises sensors, a controller and an actuating mechanism, wherein the energy of a motor of the system is sourced from a vehicle-mounted storage battery, the controller sends out a control command according to a certain control strategy and a wheel state by analyzing signals of the sensors, and when a vehicle turns and returns, current is transmitted to the motor, so that the control of power assistance, return and correction and the like is realized, the steering performance of the gas vehicle is improved, a driver is assisted to complete steering operation, and the steering becomes light, sensitive and stable. Therefore, the design of the electric power steering system is extremely important to the system. However, in the existing electric power steering system in China, a heavy truck with a large tonnage and a commercial new energy bus are not provided with a steering gear which can be better suitable for high power consumption and large power steering demand.
Disclosure of Invention
The invention aims to provide an automobile power-assisted steering gear which is more suitable for heavy trucks with large tonnage numbers and commercial new energy buses. The power steering apparatus for a vehicle of the present invention comprises: the worm driving assembly is in transmission connection with the transmission shaft worm wheel assembly;
the transmission shaft worm gear component comprises a worm gear shaft, and a sector gear connected with the screw nut assembly is arranged on the worm gear shaft; a worm wheel arranged on the worm wheel shaft is connected with a driving motor for providing power for the automobile power-assisted steering gear through a worm transmission assembly;
the screw nut assembly comprises a steering screw rod, a steering nut meshed with the sector gear is sleeved on the steering screw rod, a channel for rolling a steel ball is formed between the inner wall of the steering nut and the tooth groove of the steering screw rod, and a guide pipe communicated with the channel is arranged on the steering nut;
the worm transmission assembly comprises a worm, the worm is meshed with the worm wheel, one end of the worm is provided with a first gear, and the first gear is meshed with a second gear; the second gear is connected with a driving motor through a speed reducer with a planetary gear train arranged inside.
The automobile power-assisted steering device adopts the screw nut assembly, the transmission shaft worm gear assembly and the worm transmission assembly, so that the steering device in the scheme has a more flexible arrangement mode, is more suitable for large heavy-duty vehicles, fills the blank of the electric power-assisted steering device in the scheme, is more suitable for being used in a large automobile, is green and efficient, and simultaneously improves the comfort level of the operation feeling of a driver in the driving process. Energy is also saved because the system does not start preheating. Under the condition of not using a hydraulic oil pump, the parasitic energy loss of an engine is avoided, the fuel economy is improved, and various requirements of a large-sized automobile steering gear are met.
Specifically, the planetary gear train of the speed reducer is a duplex planetary gear set, and the driving motor outputs torque to the second gear through a planetary carrier of the duplex planetary gear set.
The invention adopts a duplex planetary gear set which can realize larger transmission ratio, the input torque of the duplex planetary gear set is transmitted to a big gear in the duplex planetary gear through a sun gear, and is transmitted to the sun gear by a planet carrier, the sun gear is meshed with a planet gear, and then the planet carrier outputs torque and rotating speed, and finally the torque and the rotating speed are transmitted to a worm, and the worm is meshed with a worm wheel.
Specifically, the double planetary gear set comprises a first planetary gear train and a second planetary gear train; the planet carrier of the first planetary gear train is in transmission connection with the sun gear of the second planetary gear train and is used for transmitting the torque to the sun gear of the second planetary gear train through the planet carrier of the first planetary gear train; the sun gear of the first planetary gear train is in transmission connection with the driving motor and used for receiving torque, and the planet carrier of the second planetary gear train is in transmission connection with the second gear.
Specifically, the arrangement direction of the first planetary gear train and the second planetary gear train is the same as the extension direction of the worm.
The automobile power-assisted steering device further comprises a steering device shell body assembly, wherein the steering device shell body assembly comprises a steering device shell body used for accommodating a screw nut assembly, a transmission shaft worm wheel assembly and a worm transmission assembly, and the steering device shell body comprises a shell body, a side cover and a gear cover which are detachably connected with the shell body in a sealing mode.
Specifically, the side cover is sealed with the housing main body through a side cover sealing gasket, and the side cover is fixed on the housing main body through a bolt; the gear cover is sealed with the shell body through a sealing gasket and fixed on the shell body through screws.
Specifically, the steering screw is arranged in parallel with the worm wheel shaft.
Specifically, the extending direction of the worm wheel shaft and the extending direction of the worm are arranged at a right angle.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description. Or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
FIG. 1 is a schematic view of the internal structure of an automobile power steering gear of the present invention;
FIG. 2 is a schematic view of the internal structure of the power steering gear of the present invention;
FIG. 3 is a schematic structural view of a screw and nut assembly of the power steering gear of the present invention;
FIG. 4 is a front view of the power assisted steering apparatus of an automobile of the present invention with the housing body and side covers and gasket removed;
FIG. 5 is a schematic front view of the power steering gear of the present invention
FIG. 6 is a schematic view of an inventive vehicle power steering gear reducer;
FIG. 7 is a schematic top view of the power steering gear of the present invention;
FIG. 8 is a front view in half section of the power assisted steering gear of the present invention;
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The term "comprises" and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
Referring to fig. 1 to 8, an automobile power steering apparatus includes: the worm gear transmission mechanism comprises a screw nut assembly 100, a transmission shaft worm gear component 200 in transmission connection with the screw nut assembly 100 and a worm transmission component 300 in transmission connection with the transmission shaft worm gear component 200;
the transmission shaft worm gear assembly 200 comprises a worm gear shaft 28, and a sector gear 12 connected with the screw nut assembly 100 is arranged on the worm gear shaft 28; a worm wheel 15 arranged on the worm wheel shaft 28 is connected with a driving motor 10 for providing power for the automobile power-assisted steering gear through a worm transmission assembly 300;
the screw nut assembly 100 comprises a steering screw 16, a steering nut 17 meshed with the sector gear 12 is sleeved on the steering screw 16, a channel for rolling a steel ball 20 is formed on the inner wall of the steering nut 17 and the tooth space of the steering screw 16, and a guide pipe 24 communicated with the channel is arranged on the steering nut 17;
the worm transmission assembly 300 comprises a worm 5, the worm 5 is meshed with the worm wheel 15, one end of the worm 5 is provided with a first gear 14, and the first gear 14 is meshed with a second gear 21; the second gear 21 is connected with the driving motor 10 through a speed reducer with a planetary gear train arranged inside. The steering screw 16 is arranged parallel to the worm shaft 28. The worm-wheel shaft 28 extends at right angles to the direction of extension of the worm 5.
The automobile power-assisted steering device has high transmission efficiency, the output of the motor drives the worm gear mechanism after being decelerated and torque-increased by the speed reducing mechanism, and large steering power is generated, and meanwhile, the electric power-assisted steering system is not dependent on an engine and does not have a hydraulic oil pipe, so that the electric power-assisted steering device is insensitive to cold weather, and can work even at minus 40 ℃, and therefore, the electric power-assisted steering device provides quick cold start. Energy is also saved because the system does not start preheating. Under the condition of not using a hydraulic oil pump, the parasitic energy loss of an engine is avoided, the fuel economy is improved, and various requirements of a large-sized automobile steering gear are met.
The planetary gear train of the speed reducer is a duplex planetary gear set, and the driving motor 10 outputs torque to the second gear 21 through the planetary carrier of the duplex planetary gear set.
The double planetary gear set comprises a first planetary gear train 7 and a second planetary gear train 8; the planet carrier of the first planetary gear train 7 is in transmission connection with the sun gear of the second planetary gear train 8 and is used for transmitting the torque to the sun gear of the second planetary gear train 8 through the planet carrier of the first planetary gear train 7; the sun gear of the first planetary gear train 7 is in transmission connection with the driving motor 10 and is used for receiving torque, and the planet carrier of the second planetary gear train 8 is in transmission connection with the second gear 21. The arrangement direction of the first planetary gear train 7 and the second planetary gear train 8 is the same as the extending direction of the worm 5.
This automobile power assisted steering ware demonstrates one set of comparatively high-quality scheme systematically, and the planetary gear through great drive ratio reduces the big moment of torsion of input for the steering ware in this scheme has more nimble arrangement mode, is suitable for among the large-scale heavy load vehicle more, fills the blank of electric power assisted steering ware at this, also agrees with the use in the big car more, and green efficient also promotes the comfort level that the driver drove the operation sense on the way simultaneously more.
The automobile power-assisted steering device further comprises a steering device shell body component, wherein the steering device shell body component comprises a steering device shell body 1 used for accommodating a screw nut assembly 100, a transmission shaft worm gear component 200 and a worm transmission component 300, the steering device shell body comprises a shell body 1, a side cover 2 and a gear cover 3 which are detachably connected with the shell body in a sealing mode, and a worm cavity 27 used for accommodating a worm 5 is formed between the shell body 1 and the side cover 2. The side cover 2 is sealed with the shell body through a side cover sealing gasket, and the side cover is fixed on the shell body through a bolt; the gear cover is sealed with the shell body through a sealing gasket and fixed on the shell body through screws.
Specifically, the inside of the housing body 1 is fixedly connected with the side cover 2 by screws, the side cover 2 seals the joint of the worm gear shaft 28 and the side cover 2 through a framework oil seal 3(60 × 85 × 12), meanwhile, the other end of the worm gear shaft 28 and the solid outer ring needle roller bearing 4 are in constraint rolling connection through the housing body 1, a four-point contact ball bearing constrained by a compression nut 9(M42) is limited in the housing body 1 close to the tail end of the worm gear shaft 28, and the worm 5 is constrained by the worm gear face contact with the worm gear shaft 28. One end of the worm 5 is connected with the tapered roller bearing 26 in a restraining way through a compression screw plug (M72), the other end of the worm 5 is symmetrically provided with another tapered roller bearing 26, the tail end of the worm 5 is connected with the first gear 14 through the compression retainer ring 18, the bolt 19 is fixedly connected with the compression retainer ring 18, then the gear 14 is vertically contacted with the second gear 21 according to the transmission requirement, the two gears are protected by the gear cover seal 22 and the gear cover 23, and the second gear 21 is connected with the driving motor 10 through the framework oil seal 13(45 multiplied by 70 multiplied by 12). The sector gear at one end of the worm wheel shaft 28 close to the solid outer ring needle roller bearing 4 is contacted with a steering nut 17 in a screw nut assembly 100, the steering nut 17 is connected with a steering screw rod by a guide pipe 24 and a guide pipe clamp 25 by an M5 multiplied by 8 screw, one end of the steering screw rod is fixed with a compression screw plug (M72) by a locking ring through an eccentric sleeve 6, and the other end is connected with an upper cover assembly 11 through a bearing.
When the steering wheel is used, the torque sensor mounted on the steering shaft continuously measures the torque signal on the steering shaft along with the operation of the steering wheel, so that the signal and the vehicle speed signal are simultaneously input into the electronic control unit. The electric control unit determines the magnitude and the direction of the power-assisted torque according to the input signal, namely determines the magnitude and the direction of the current of the motor, and adjusts the magnitude of the steering auxiliary power. The torque of the driving motor is loaded on a steering mechanism of the automobile after the electromagnetic clutch is subjected to speed reduction and distance increase through the speed reducer, so that a steering acting force which is adaptive to the working condition of the automobile is obtained.
An Electronic Control Unit (ECU) determines the rotation direction and the optimal boosting torque of the motor according to signals output by the sensors, sends control signals to the motor and the clutch, controls the rotation of the direct-current motor through a power driving circuit, reduces the speed and increases the torque of the output of the motor through a speed reducing mechanism, adopts a secondary planetary reducer with a large transmission ratio, reduces the input large torque by utilizing worm and gear transmission, and increases the transmission efficiency of a transmission system on the basis of adopting a circulating ball type structure. The automobile power-assisted steering gear has a more flexible arrangement mode and has the possibility and the practical desirability of being applied to large special vehicles.
Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (8)
1. The automobile power-assisted steering gear is characterized by comprising a screw nut assembly, a transmission shaft worm wheel component in transmission connection with the screw nut assembly, and a worm transmission component in transmission connection with the transmission shaft worm wheel component;
the transmission shaft worm gear component comprises a worm gear shaft, and a sector gear connected with the screw nut assembly is arranged on the worm gear shaft; a worm wheel arranged on the worm wheel shaft is connected with a driving motor for providing power for the automobile power-assisted steering gear through a worm transmission assembly;
the screw nut assembly comprises a steering screw rod, a steering nut meshed with the sector gear is sleeved on the steering screw rod, a channel for rolling a steel ball is formed between the inner wall of the steering nut and the tooth groove of the steering screw rod, and a guide pipe communicated with the channel is arranged on the steering nut;
the worm transmission assembly comprises a worm, the worm is meshed with the worm wheel, one end of the worm is provided with a first gear, and the first gear is meshed with a second gear; the second gear is connected with a driving motor through a speed reducer with a planetary gear train arranged inside.
2. The power steering apparatus of claim 1, wherein the planetary gear train of the speed reducer is a double planetary gear set, and the driving motor outputs the torque to the second gear through a carrier of the double planetary gear set.
3. The power steering apparatus of claim 2, wherein the double planetary gear set includes a first planetary gear set and a second planetary gear set; the planet carrier of the first planetary gear train is in transmission connection with the sun gear of the second planetary gear train and is used for transmitting the torque to the sun gear of the second planetary gear train through the planet carrier of the first planetary gear train; the sun gear of the first planetary gear train is in transmission connection with the driving motor and used for receiving torque, and the planet carrier of the second planetary gear train is in transmission connection with the second gear.
4. The power steering apparatus according to claim 3, wherein the first planetary gear set and the second planetary gear set are arranged in the same direction as the extending direction of the worm.
5. The power steering apparatus of claim 1, further comprising a steering housing body assembly including a steering housing body for receiving the screw nut assembly, the drive shaft worm gear assembly and the worm drive assembly, the steering housing body including a housing body, a side cover and a gear cover that are detachable from and sealingly coupled to the housing body.
6. The power steering apparatus of claim 5, wherein the side cover is sealed with the housing main body by a side cover gasket, the side cover being fixed to the housing main body by a bolt; the gear cover is sealed with the shell body through a sealing gasket and fixed on the shell body through screws.
7. The power assisted steering apparatus of claim 1, wherein the steering screw is disposed in parallel with the worm shaft.
8. The power steering apparatus of claim 1, wherein the worm shaft extends at right angles to the worm.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021102675317 | 2021-03-11 | ||
| CN202110267531 | 2021-03-11 | ||
| CN2021205196911 | 2021-03-11 | ||
| CN202120519691 | 2021-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112829825A true CN112829825A (en) | 2021-05-25 |
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ID=75930141
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110277662.3A Pending CN112829825A (en) | 2021-03-11 | 2021-03-15 | Rocker shaft boosting type circulating ball electric power steering gear |
| CN202120533713.XU Active CN215284964U (en) | 2021-03-11 | 2021-03-15 | Large-output-torque electric power steering gear |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120533713.XU Active CN215284964U (en) | 2021-03-11 | 2021-03-15 | Large-output-torque electric power steering gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112829825A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113581279A (en) * | 2021-07-23 | 2021-11-02 | 浙江万安泵业有限公司 | Shell and circulating ball type electric steering device |
| CN113715904A (en) * | 2021-09-17 | 2021-11-30 | 盐城工学院 | Electric power steering gear |
-
2021
- 2021-03-15 CN CN202110277662.3A patent/CN112829825A/en active Pending
- 2021-03-15 CN CN202120533713.XU patent/CN215284964U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113581279A (en) * | 2021-07-23 | 2021-11-02 | 浙江万安泵业有限公司 | Shell and circulating ball type electric steering device |
| CN113715904A (en) * | 2021-09-17 | 2021-11-30 | 盐城工学院 | Electric power steering gear |
Also Published As
| Publication number | Publication date |
|---|---|
| CN215284964U (en) | 2021-12-24 |
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