CN113184047A - Rotary valve structure of recirculating ball power steering gear - Google Patents
Rotary valve structure of recirculating ball power steering gear Download PDFInfo
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- CN113184047A CN113184047A CN202110539665.XA CN202110539665A CN113184047A CN 113184047 A CN113184047 A CN 113184047A CN 202110539665 A CN202110539665 A CN 202110539665A CN 113184047 A CN113184047 A CN 113184047A
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- 230000003134 recirculating effect Effects 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 description 291
- 239000010720 hydraulic oil Substances 0.000 description 8
- 239000012208 gear oil Substances 0.000 description 1
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Classifications
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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
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
- B62D5/083—Rotary valves
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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
A rotary valve structure of a recirculating ball power steering gear comprises a valve body, a screw rod and an input shaft, wherein the screw rod is sleeved in the valve body, and the input shaft is sleeved in the screw rod; the torsion bar is sleeved in the input shaft; the valve body is provided with an oil inlet and an oil return port, the oil inlet and outlet holes on the outer circumferential surface of the screw are respectively communicated with the oil inlet and oil return ring groove on the valve body, and the inner circumferential surface of the screw 4 is uniformly distributed with 6 screw oil grooves which are respectively communicated with the oil hole of the right oil cavity and the oil hole of the input shaft; the annular body of the screw 4 is uniformly provided with screw rod left oil cavity oil holes which are communicated with a left oil cavity of the steering gear; the oil holes on the input shaft are communicated with the inner hole of the input shaft; the input shaft oil inlet groove is communicated with the screw oil inlet hole, and the input shaft oil return groove is communicated with the screw oil return hole; the oil holes on the input shaft are respectively communicated with the screw oil grooves, and the inner hole of the input shaft is communicated with the inner hole of the screw. The invention provides a rotary valve of a circulating ball power steering gear, which is small in structure and high-pressure resistant, and meets the requirements of small space arrangement of a whole vehicle and a high-pressure steering system.
Description
Technical Field
The invention belongs to a circulating ball power steering gear, and particularly relates to a rotary valve.
Background
The rotary valve of the recirculating ball power steering gear is a main unit of the recirculating ball power steering gear, and plays a role in controlling the shunting and pressure building of the whole steering system. The rotary valve has important functions and a complex structure, and is connected with an oil inlet and an oil outlet of a system, so that the structural arrangement of the rotary valve is large, the input end of the recirculating ball power steering gear occupies more external space, and the arrangement of the whole vehicle is inconvenient; in addition, due to the upgrade of a whole vehicle steering system, the structural requirement of the rotary valve can reach the bearing capacity of more than 17MPa at present, the requirement on the durability and the pressure impact resistance of the rotary valve of the power steering gear under high pressure is met, and the rotary valve cannot be damaged in use under a high-pressure system. Based on the circumstances, the developed rotary valve structure has small occupied space and can adapt to high pressure, and the requirement of the development of the steering gear automobile industry is met.
Disclosure of Invention
The invention aims to: the rotary valve of the circulating ball power steering gear is small in structure and high-pressure resistant, and meets the requirements of small space arrangement of the whole vehicle and a high-pressure steering system.
The technical scheme of the invention is as follows:
a rotary valve structure of a recirculating ball power steering gear comprises a valve body, a screw rod and an input shaft, wherein the screw rod is sleeved in the valve body, and the input shaft is sleeved in the screw rod; the torsion bar is sleeved in the input shaft;
the valve body is provided with an oil inlet and an oil return opening, an oil inlet ring groove and an oil return ring groove are arranged in the valve body, the oil inlet ring groove is communicated with the oil inlet, and the oil return ring groove is communicated with the oil return opening;
3 screw oil inlet holes are uniformly distributed on the outer circumferential surface of the screw and are communicated with an oil inlet ring groove in the valve body, 3 oil return holes and 3 right oil cavity through oil holes are symmetrically arranged on two sides of the oil inlet holes and are communicated with the oil return ring groove on the valve body, and the 3 right oil cavity through oil holes are communicated with a right oil cavity of the steering gear; 3 oil holes communicated with a left oil cavity are uniformly distributed at the bottom of the screw rod and are communicated with the left oil cavity of the steering gear;
6 screw oil grooves are uniformly distributed on the inner circumferential surface of the screw 4, the oil grooves are arranged between screw oil inlet holes in pairs, 3 screw oil through right oil cavity holes are communicated with 3 screw oil grooves which are spaced, and the other 3 screw oil grooves are communicated with 3 oil holes on the outer circumference of the input shaft;
3 screw rod left oil cavity oil holes are uniformly distributed on the annular body of the screw rod 4, one end of the screw rod left oil cavity oil hole is communicated with a left oil cavity of the steering gear, and the other end of the screw rod left oil cavity oil hole is communicated with a screw rod inner hole of the screw rod;
3 oil inlet grooves are uniformly distributed on the input shaft, 3 oil return grooves are uniformly distributed between the oil inlet grooves, a plurality of oil holes are uniformly distributed on the body between the oil inlet grooves and the oil return grooves of the input shaft, and the oil holes are communicated with an inner hole of the input shaft; the input shaft oil inlet groove is communicated with the screw oil inlet hole, and the input shaft oil return groove is communicated with the screw oil return hole; one end of the oil hole on the input shaft is respectively communicated with the screw oil groove, and the other end of the oil hole is communicated with the inner hole of the input shaft;
the inner hole of the input shaft is communicated with the inner hole of the screw rod.
The screw rod is connected with the torsion bar through a fixing pin, the input shaft is connected with the torsion bar through a fixing pin, the screw rod, the input shaft and the torsion bar jointly form a screw rod assembly, a bearing is arranged in the valve body, and the bearing is matched with the large-diameter end face of the screw rod.
3 sealing positions are arranged in the valve body 1, wherein the sealing position A is matched with the large diameter of the screw, the sealing position B is matched with the middle diameter of the screw, and the sealing position C is matched with the large diameter of the input shaft.
The number of the input shaft oil holes is multiple of 3.
The invention has the advantages that:
the rotary valve structure of the recirculating ball power steering gear has the characteristics of small structure and high pressure resistance. In structural arrangement, although the rotary valve part is provided with 2 high-pressure oil ducts, one high-pressure oil duct leading to the left oil chamber of the steering gear is arranged on the screw and the inner hole of the input shaft, so that only 2 oil passing ring grooves are required to be arranged on the valve body, and the axial size of the input end of the whole steering gear is shortened. The rotary valve part of the prior circulating ball power steering gear consists of 4 sealing positions and 3 oil passing ring grooves, and is longer in the axial dimension of the whole input end. In structural design, the rotary valve adopts a pressure balance design, so that unilateral hydraulic axial force borne by a screw rod on the rotary valve when a left oil cavity and a right oil cavity respectively have high pressure is smaller, the rotary valve can adapt to a high-pressure steering system, and the durability is better.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic representation of the use of the present invention;
FIG. 3 is a schematic cross-sectional view of the oil path of the novel screw assembly of the present invention;
FIG. 4 is a schematic view showing the distribution of oil holes at the bottom end of the screw according to the present invention;
FIG. 5 is a schematic view of the novel left turn operating mode of the screw assembly of the present invention;
fig. 6 is a schematic view of the right steering operation of the novel screw assembly of the present invention.
In the figure: 1. a valve body, 2, a bearing, 3, an input shaft, 4, a screw, 5, a torsion bar, 6, a seal position A, 7, a seal position B, 8, a seal position C, 9, an oil inlet ring groove, 10, an oil return ring groove, 11, an oil inlet, 12, an oil return port, 13, a left oil chamber, 14, a right oil chamber, 15, a screw oil inlet hole A, 16, a screw oil inlet hole B, 17, a screw oil inlet hole C, 18, a screw oil return hole A, 19, a screw oil return hole B, 20, a screw oil return hole C, 21, a screw passing right oil chamber oil hole A, 22, a screw passing right oil chamber oil hole B, 23, a screw passing right oil chamber oil hole C, 24, an input shaft oil hole A, 25, an input shaft oil hole B, 26, an input shaft oil hole C, 27, an input shaft oil groove A, 28, an input shaft oil groove B, 29, an input shaft oil groove C, 30, an input shaft oil return groove A, 31, an input shaft oil return groove B, 32, an input oil return groove C, 33. the screw oil grooves A and 34, the screw oil grooves B and 35, the screw oil grooves C and 36, the screw oil grooves D and 37, the screw oil grooves E and 38, the screw oil grooves F and 39, the input shaft inner holes 40, the screw inner holes 41, the screw left oil passage oil holes A and 42, the screw left oil passage oil holes B and 43 and the screw left oil passage oil hole C.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1-4, the present invention comprises: the valve comprises a valve body 1, a bearing 2, an input shaft 3, a screw rod 4 and a torsion bar 5, wherein the screw rod 4 is connected with the torsion bar 5 through a fixing pin, the input shaft 3 is connected with the torsion bar 5 through the fixing pin, the screw rod 4, the input shaft 3 and the torsion bar 5 jointly form a screw rod assembly, the bearing 2 is arranged in the valve body 1, and the bearing 2 is matched with the end face of the screw rod 4.
3 sealing positions are arranged in the valve body 1, wherein the sealing position A6 is matched with the large diameter of the screw rod 4, the sealing position B7 is matched with the middle diameter of the screw rod 4, and the sealing position C8 is matched with the large diameter of the input shaft 3; and 2 oil passing ring grooves are also arranged in the valve body 1, wherein the oil inlet ring groove 9 is communicated with the oil inlet 11 through an oil hole, and the oil return ring groove 10 is communicated with the oil return port 12 through the oil hole. The sealing position A6, the sealing position B7 and the sealing position C8 separate the oil inlet ring groove 9, the oil return ring groove 10 and the right oil chamber 14 of the steering gear.
The bearing 2 is matched with the large-diameter end face of the screw rod 4, and plays a role in supporting the screw rod 4 and adjusting the axial clearance of the rotary valve.
3 screw oil inlet holes are uniformly distributed on the circumference of the upper end of the screw 4 at 120 degrees, a screw oil inlet hole A15, a screw oil inlet hole B16 and a screw oil inlet hole C17 are formed, the 3 screw oil inlet holes are communicated with an oil inlet ring groove 9 in the valve body 1, 2 groups of oil holes are symmetrically arranged on two sides of the screw 4 oil inlet hole, one group of oil holes are a screw right oil cavity through oil hole A21, a screw right oil cavity through oil hole B22 and a screw right oil cavity through oil hole C23, the other group of oil holes are a screw oil return hole A18, a screw oil return hole B19 and a screw oil return hole C20, and the 2 groups of oil holes are uniformly distributed on the circumference of the screw 4 at 120 degrees. The screw rod right oil chamber oil hole A21, the screw rod right oil chamber oil hole B22 and the screw rod right oil chamber oil hole C23 are communicated with a right oil chamber 14 of the steering gear, and the screw rod oil return hole A18, the screw rod oil return hole B19 and the screw rod oil return hole C20 are communicated with an oil return ring groove 10 of the valve body 1.
The inner circumference of the screw 4 is uniformly provided with 6 oil grooves at 60 degrees, namely a screw oil groove A33, a screw oil groove B34, a screw oil groove C35, a screw oil groove D36, a screw oil groove E37 and a screw oil groove F38, wherein the oil grooves are arranged on two sides of a screw oil inlet A15, a screw oil inlet B16 and a screw oil inlet C17 in pairs, and a screw right oil cavity passing oil hole A21, a screw right oil cavity passing oil hole B22 and a screw right oil cavity passing oil hole C23 are respectively communicated with the screw oil groove A33, the screw oil groove B34 and the screw oil groove C35.
3 screw oil holes are uniformly distributed on the circumference of the bottom end of the screw rod 4 at 120 degrees, namely a screw rod left oil chamber oil hole A41, a screw rod left oil chamber oil hole B42 and a screw rod left oil chamber oil hole C43, one end of each of the 3 oil holes is communicated with the left oil chamber 13 of the steering gear, and the other end of each of the 3 oil holes is communicated with the screw rod inner hole 40 of the screw rod 4.
3 oil inlet grooves are uniformly distributed on the circumference of the input shaft 3 at 120 degrees, namely an input shaft oil inlet groove A27, an input shaft oil inlet groove B28 and an input shaft oil inlet groove C29, and 3 oil return grooves are uniformly distributed on the circumference among the 3 oil inlet grooves, namely an input shaft oil return groove A30, an input shaft oil return groove B31 and an input shaft oil return groove C32. The input shaft oil inlet groove A27, the input shaft oil inlet groove B28 and the input shaft oil inlet groove C29 are respectively communicated with a screw oil inlet hole A15, a screw oil inlet hole B16 and a screw oil inlet hole C17, and the input shaft oil return groove A30, the input shaft oil return groove B31 and the input shaft oil return groove C32 are respectively communicated with a screw oil return hole A18, a screw oil return hole B19 and a screw oil return hole C20.
3 oil holes are evenly distributed on the circumference of the input shaft 3 at 120 degrees and respectively include an input shaft oil hole A24, an input shaft oil hole B25 and an input shaft oil hole C26, one end of each of the 3 oil holes is respectively communicated with the screw oil groove D36, the screw oil groove E37 and the screw oil groove F38, and the other end of each of the 3 oil holes is communicated with the input shaft inner hole 39.
The input shaft bore 39 of the input shaft 3 communicates with the screw bore 40 of the screw 4.
The number of the input shaft oil holes is not necessarily limited to 3, and may be a multiple of 3. The number of the input shaft and screw oil groove sets is not limited to the above 6, and may be a plurality of sets.
Referring to the attached fig. 5 and 6, the rotary valve working principle of the recirculating ball power steering gear is as follows:
when the steering wheel is not moved and the steering gear is in the middle position, hydraulic oil enters a screw oil inlet A15, a screw oil inlet B16 and a screw oil inlet C17 through an oil inlet 11 and then enters an input shaft oil inlet groove A27, an input shaft oil inlet groove B28 and an input shaft oil inlet groove C29 on the input shaft 3, and because a reserved gap is reserved between the oil grooves of the input shaft 3 and the screw 4, the hydraulic oil entering the input shaft oil inlet groove can enter a left oil cavity 13 and a right oil cavity 14 of the steering gear in two ways. One path of hydraulic oil enters the screw oil groove D36, the screw oil groove E37 and the screw oil groove F38 through a reserved gap between the oil grooves, then enters the input shaft inner hole 39 through the input shaft oil hole A24, the input shaft oil hole B25 and the input shaft oil hole C26, the input shaft inner hole 39 is communicated with the screw inner hole 40, and finally, the hydraulic oil enters the left steering gear oil chamber 13 through the screw left oil chamber oil hole A41, the screw left oil chamber oil hole B42 and the screw left oil chamber oil hole C43. And the other path of hydraulic oil enters the screw oil groove A33, the screw oil groove B34 and the screw oil groove C35 through a reserved gap between the oil grooves, and the communicated screw right oil chamber oil hole A21, screw right oil chamber oil hole B22 and screw right oil chamber oil hole C23 and enters the steering gear right oil chamber 14. In addition, hydraulic oil in the oil groove of the screw 4 can synchronously enter the input shaft oil return groove a30, the input shaft oil return groove B31 and the input shaft oil return groove C32 on the input shaft 3 through the reserved clearance, and then enter the oil return ring groove 10 of the valve body 1 through the screw oil return hole a18, the screw oil return hole B19 and the screw oil return hole C20 which are communicated with the input shaft oil return groove B31 and the input shaft oil return groove C32, and then enter the oil return port 12 and then flow back to the steering system.
When the steering wheel turns left, the input shaft 3 of the steering gear rotates anticlockwise, and the torsion bar 5 deforms due to the friction resistance on the ground, so that the input shaft 3 and the screw rod 4 in the rotary valve of the steering gear rotate relatively. Due to the deformation of the torsion bar 5, the gap between the oil groove on the input shaft 3 and the oil groove on the screw 4 is increased in one direction and completely closed in the other direction, so that hydraulic oil enters the screw oil inlet hole A15, the screw oil inlet hole B16 and the screw oil inlet hole C17 through the oil inlet 11, then enters the input shaft oil inlet groove A27, the input shaft oil inlet groove B28 and the input shaft oil inlet groove C29 on the input shaft 3, then enters the screw oil groove D36, the screw oil groove E37 and the screw oil groove F38, then enters the input shaft inner hole 39 and the screw inner hole 40 through the input shaft oil hole A24, the input shaft oil hole B25 and the input shaft oil hole C26, and then enters the steering gear left oil chamber 13 through the screw oil through the left oil chamber A41, the screw oil chamber B42 and the screw oil chamber C43. Because the oil groove gap on one side of the rotary valve is closed, the hydraulic oil in the right oil chamber 14 of the steering gear can pass through the screw rod right oil chamber oil hole A21, the screw rod right oil chamber oil hole B22 and the screw rod right oil chamber oil hole C23 under the pushing action of the steering gear piston, then pass through the screw rod oil groove A33, the screw rod oil groove B34 and the screw rod oil groove C35, enter the input shaft oil return groove A30, the input shaft oil return groove B31 and the input shaft oil return groove C32, enter the oil return ring groove 10 of the valve body 1 through the screw rod oil return hole A18, the screw rod oil return hole B19 and the screw rod oil return hole C20, then enter the oil return port 12 and then return to the steering system. When the steering wheel turns right, the reverse is true.
The stress balance principle of the rotary valve structure of the recirculating ball power steering gear is as follows:
the screw 4 has a large diameter: d1, pitch diameter of screw 4: d2, small diameter of screw 4: D3.
is provided with
When the left oil chamber 13 of the steering gear is under high pressure, the axial force borne by the steering screw rod is as follows:
when the steering gear right oil chamber 14 is under high pressure, the axial force borne by the steering screw rod is as follows:
due to the fact that
The steering screw is subjected to a small additional axial force.
Claims (4)
1. A rotary valve structure of a recirculating ball power steering gear comprises a valve body, a screw rod and an input shaft, wherein the screw rod is sleeved in the valve body, and the input shaft is sleeved in the screw rod; the torsion bar is sleeved in the input shaft; the method is characterized in that:
the valve body is provided with an oil inlet and an oil return opening, an oil inlet ring groove and an oil return ring groove are arranged in the valve body, the oil inlet ring groove is communicated with the oil inlet, and the oil return ring groove is communicated with the oil return opening;
3 screw oil inlet holes are uniformly distributed on the outer circumferential surface of the screw and are communicated with an oil inlet ring groove in the valve body, 3 oil return holes and 3 right oil cavity through oil holes are symmetrically arranged on two sides of the oil inlet holes and are communicated with the oil return ring groove on the valve body, and the 3 right oil cavity through oil holes are communicated with a right oil cavity of the steering gear; 3 oil holes communicated with a left oil cavity are uniformly distributed at the bottom of the screw rod and are communicated with the left oil cavity of the steering gear;
6 screw oil grooves are uniformly distributed on the inner circumferential surface of the screw 4, the oil grooves are arranged between screw oil inlet holes in pairs, 3 screw oil through right oil cavity holes are communicated with 3 screw oil grooves which are spaced, and the other 3 screw oil grooves are communicated with 3 oil holes on the outer circumference of the input shaft;
3 screw rod left oil cavity oil holes are uniformly distributed on the annular body of the screw rod 4, one end of the screw rod left oil cavity oil hole is communicated with a left oil cavity of the steering gear, and the other end of the screw rod left oil cavity oil hole is communicated with a screw rod inner hole of the screw rod;
3 oil inlet grooves are uniformly distributed on the input shaft, 3 oil return grooves are uniformly distributed between the oil inlet grooves, a plurality of oil holes are uniformly distributed on the body between the oil inlet grooves and the oil return grooves of the input shaft, and the oil holes are communicated with an inner hole of the input shaft; the input shaft oil inlet groove is communicated with the screw oil inlet hole, and the input shaft oil return groove is communicated with the screw oil return hole; one end of the oil hole on the input shaft is respectively communicated with the screw oil groove, and the other end of the oil hole is communicated with the inner hole of the input shaft;
the inner hole of the input shaft is communicated with the inner hole of the screw rod.
2. The rotary valve structure of a recirculating ball power steering gear according to claim 1, wherein: the screw rod is connected with the torsion bar through a fixing pin, the input shaft is connected with the torsion bar through a fixing pin, the screw rod, the input shaft and the torsion bar jointly form a screw rod assembly, a bearing is arranged in the valve body, and the bearing is matched with the large-diameter end face of the screw rod.
3. The rotary valve structure of a recirculating ball power steering gear according to claim 2, wherein: the valve body is internally provided with 3 sealing positions, wherein the sealing position A is matched with the major diameter of the screw, the sealing position B is matched with the middle diameter of the screw, and the sealing position C is matched with the major diameter of the input shaft.
4. The rotary valve structure of a recirculating ball power steering gear according to claim 3, wherein: the number of the input shaft oil holes is multiple of 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110539665.XA CN113184047B (en) | 2021-05-18 | 2021-05-18 | Rotary valve structure of recirculating ball power steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110539665.XA CN113184047B (en) | 2021-05-18 | 2021-05-18 | Rotary valve structure of recirculating ball power steering gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113184047A true CN113184047A (en) | 2021-07-30 |
| CN113184047B CN113184047B (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110539665.XA Active CN113184047B (en) | 2021-05-18 | 2021-05-18 | Rotary valve structure of recirculating ball power steering gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114750824A (en) * | 2022-04-22 | 2022-07-15 | 杭州世宝汽车方向机有限公司 | Rotary valve of hydraulic power-assisted steering gear |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201058620Y (en) * | 2006-10-20 | 2008-05-14 | 江门市兴江转向器有限公司 | Complete-characteristic steering control valve |
| JP2009073229A (en) * | 2007-09-19 | 2009-04-09 | Hitachi Ltd | Hydraulic control valve and power steering device |
| CN203819329U (en) * | 2014-04-18 | 2014-09-10 | 采埃孚商用车转向机（山东）有限公司 | Valve core for steering machine, screw assembly provided with the valve core, and light hand power steering machine |
| CN111332361A (en) * | 2020-04-18 | 2020-06-26 | 荆州恒隆汽车技术(检测)中心 | Integral double-loop steering gear assembly suitable for military off-road vehicle |
-
2021
- 2021-05-18 CN CN202110539665.XA patent/CN113184047B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201058620Y (en) * | 2006-10-20 | 2008-05-14 | 江门市兴江转向器有限公司 | Complete-characteristic steering control valve |
| JP2009073229A (en) * | 2007-09-19 | 2009-04-09 | Hitachi Ltd | Hydraulic control valve and power steering device |
| CN203819329U (en) * | 2014-04-18 | 2014-09-10 | 采埃孚商用车转向机（山东）有限公司 | Valve core for steering machine, screw assembly provided with the valve core, and light hand power steering machine |
| CN111332361A (en) * | 2020-04-18 | 2020-06-26 | 荆州恒隆汽车技术(检测)中心 | Integral double-loop steering gear assembly suitable for military off-road vehicle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114750824A (en) * | 2022-04-22 | 2022-07-15 | 杭州世宝汽车方向机有限公司 | Rotary valve of hydraulic power-assisted steering gear |
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| Publication number | Publication date |
|---|---|
| CN113184047B (en) | 2024-01-26 |
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