CN201494494U - High-pressure circulating ball power steering gear - Google Patents
High-pressure circulating ball power steering gear Download PDFInfo
- Publication number
- CN201494494U CN201494494U CN2009202276044U CN200920227604U CN201494494U CN 201494494 U CN201494494 U CN 201494494U CN 2009202276044 U CN2009202276044 U CN 2009202276044U CN 200920227604 U CN200920227604 U CN 200920227604U CN 201494494 U CN201494494 U CN 201494494U
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- steering
- power steering
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- oil cylinder
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Abstract
The utility model relates to a high-pressure circulating ball power steering gear, belonging to the technical field of automotive power steering gear. The power steering gear comprises a steering rocker shaft, a side cover component, a steering nut, a valve component and a casing component, wherein the steering rocker shaft is installed on the output end of an oil cylinder casing, the steering nut is installed on a steering screw, the end portion of the steering screw is connected with an input shaft, and a safety valve is installed on the valve component. The pressure angle of a gear section on the steering rocker shaft is 27 degrees five minutes, the gear sector can bear torsion load below pressure of 20 MPa, thereby improving the integral strength of the steering rocker shaft. One end of a bearing is fixed with the oil cylinder on one end, and the other end of the bearing is positioned by an elastic gasket for hole which can be conveniently assembled, thereby guaranteeing the positioning stability of the bearing in the cylinder, and preventing the bearing from axially displacing in the cylinder. The high-pressure circulating ball power steering gear solves the problems of faults of the steering gear, such as clamping, heaviness and the like as the steering gear is located in limit position, and the steering screw has insufficient rigidity. And the service life of the steering gear is effectively protected.
Description
Technical field:
The utility model relates to the power steering that a kind of automobile is used, and particularly a kind of operating oil pressure is not higher than the cycle of higher pressure ball power steering of 20MPa, belongs to the automobile power steering technical field.
Background technology:
The steering swivel system of circulating ball type automobile power steering finishes to turn to afterburning action as power with fluid pressure, its working medium is a fluid.The principal parameter of power steering has cylinder diameter, operation pressure, output torque; Generally be representative with the output torque, different preceding axle loads needs the power steering of different output torques to match, so output torque is to weigh an important parameter of deflector performance figure.And the size of output torque depends on the size of oil cylinder working area, oil pump maximum pressure and sector reference radius, and the computing formula of output torque is as follows:
M＝P.S.R
F(N.m)
M------power steering output torque
The P------operation pressure, MPa;
S------oil cylinder working area, m
2
R
F------sector reference radius, m;
According to formula as can be seen, the output torque that increases power steering can be considered from the following aspects: the one, and the working area of increase oil cylinder; The 2nd, the oil pressure of raising power steering; The 3rd, increase the sector reference radius.But arrange and the structural compactness consideration from car load, increase oil cylinder working area and sector reference radius simply, must increase integral vehicle cost and topology layout.Therefore, the developing direction of power steering mainly is to develop to the big cylinder diameter direction of high pressure now.
Present ball-and-nut power steering device commonly used on heavy duty truck, most cylinder diameter is 110mm, operating oil pressure is 13Mpa, automobile is in transportation, particularly under the situation of relatively poor travel phase of road conditions and serious overload, normal because its output torque can not satisfy the needs that heavily are stuck in the driving process, direction machine hair fastener, fault such as heavy appear, the appearance of these faults gently then endangers the cruising of automobile, and is heavy then cause the major traffic accidents of car crash.For solving these potential problems, according to above formula as can be known: under operating oil pressure and sector reference radius unmodified situation, when cylinder diameter was increased to 120mm by 110mm, its output torque was increased to original 1.2 times; Under cylinder diameter and sector reference radius unmodified situation, when operating oil pressure was brought up to 15MPa by 13MPa, its output torque was increased to original 1.15 times.Based on above analysis as can be known, increase the oil cylinder cylinder diameter and can improve output torque, but must increase the car load arrangement space, be unfavorable for the compactedness of structure; If increase operating oil pressure, can under the prerequisite that does not influence car load layout and structural compactness, can improve the output torque of deflector greatly, and then also just increase the load-carrying capacity of the preceding load per axle of car load greatly.
Summary of the invention:
The purpose of this utility model is, after providing a kind of component structural to improve with ball-and-nut steering gear, at cylinder diameter is under the state of 120mm, can under not being higher than the situation of 20MPa, operating oil pressure not satisfy job requirement, the output torque of power steering is increased, avoid automobile in transportation, particularly in the relatively poor travel phase of road conditions, direction machine hair fastener, fault such as heavy do not appear, the cycle of higher pressure ball power steering that allows the driver become lighter when handling.
The utility model is to realize above-mentioned purpose by the following technical solutions:
This cycle of higher pressure ball power steering is by pitman shaft, the side cover assembly, steering nut, valve assembly and housing assembly constitute, pitman shaft and side cover assembly are contained in the bottom of housing assembly, steering nut and valve assembly are contained in the top of housing assembly, both are by pitman shaft and steering nut engagement, it is characterized in that: pitman shaft is installed in the mouth of oil cylinder housing by cylindrical roller bearing, and locate at end face by circlip for bore, steering nut is housed on the steering screw, one end of steering screw is equipped with valve body and loam cake, and this end of steering screw connects with input shaft.The outside that the oil cylinder housing is installed cylindrical roller bearing is shaped on positioning step, and the other end is shaped on positioning groove, and circlip for bore is installed in the positioning groove, and the cylindrical of two outer rings in the valve assembly and valve body and loam cake endoporus adopt free-running fit respectively.Safety valve is installed on the valve assembly by being threaded, and with oil inlet, return opening UNICOM, the High-pressure oil sealing interference is assemblied in the mouth of oil cylinder housing.
The angle of obliquity β of the fan tooth on the described pitman shaft is 27.5 °.
Described side cover assembly comprises side cover, cylindrical roller bearing, High-pressure oil sealing, o shape rubber seal and circlip.
The utility model beneficial effect compared with prior art is:
1, the sector of pitman shaft adopts the angle of obliquity greater than 20 °, has increased the area of fan tooth tooth root, thereby has improved the intensity of fan tooth, makes the fan tooth of pitman shaft can bear the torque load of 20MPa with downforce.Thereby improved the bulk strength of pitman shaft.
2, oil cylinder mouth bearing adopts cylindrical roller bearing, can bear bigger dynamic load rating and rated static load than needle bearing commonly used.Simultaneously, oil cylinder adopts the higher QT500-7 ductile cast iron material of tensile strength to make, and its vulnerable part has been adopted the reinforcing rib structure design, thereby guaranteed that effectively oil cylinder can bear the pressure that is not higher than 20MPa.
3, the assembling of bearing and oil cylinder adopts an end to locate in cylinder body, and the other end adopts the circlip for bore location; Radially having adopted the less no gap of the magnitude of interference to cooperate, more convenient during assembling because the magnitude of interference is little, and also two ends all have spacingly, have both guaranteed the stability that bearing is located in cylinder body, have guaranteed that again bearing does not have longitudinal travel to take place in cylinder body.
4, the oil cylinder mouth adopts the High-pressure oil sealing structure, can guarantee direction machine excellent sealing performance under high pressure by actv., has solved direction machine mouth because for dynamic seal, to the demanding problem of high temperature resistant and resistance to abrasion of sealing member.
5, the outer ring of valve assembly and valve body and loam cake adopt free-running fit, have reduced the wearing and tearing to screw rod circuit position, have reduced the faults such as hair fastener that cause the direction machine in use to occur owing to the wearing and tearing of screw rod circuit.
6, steering screw adopts the two ends positioning supports, the bind mode that press-fits of short torsion spring and solid steering screw employing interference, increased the intensity and the rigidity of steering screw, reduced the direction machine when end position, the hair fastener that occurs because of the steering screw insufficient rigidity, fault such as heavy.
7, valve body assembly oil inlet place has increased relief valve device, can be according to user's request, adjust entrance pressure among a small circle, and effectively protect the service life of direction machine.
Description of drawings:
Fig. 1 is a kind of front view of cycle of higher pressure ball power steering;
Fig. 2 is a kind of left view of cycle of higher pressure ball power steering;
Fig. 3 is the structural representation of valve assembly;
Fig. 4 is the enlarged drawing at A place among Fig. 2;
Fig. 5 is the structural representation of housing assembly;
Fig. 6 is the structural representation of relief valve device.
Among the figure: 1, pitman shaft, 2, the oil cylinder housing, 3, circlip for bore, 4, cylindrical roller bearing, 5, steering screw, 6, valve body, 7, loam cake, 8, the fan tooth, 9, High-pressure oil sealing, 10, steering nut, 11, input shaft, 12, positioning groove, 13, safety valve, 14, oil inlet, 15, return opening, 16, valve assembly, 17, housing assembly.
The specific embodiment:
This cycle of higher pressure ball power steering is made of pitman shaft 1, side cover assembly, steering nut 10, valve assembly 16 and housing assembly 17, pitman shaft 1 and side cover assembly are contained in the bottom of housing assembly 17, steering nut 10 and valve assembly 16 are contained in the top of housing assembly 17, and both are by pitman shaft 1 and steering nut 10 engagements.Pitman shaft 1 is installed in the mouth of oil cylinder housing 2 by cylindrical roller bearing 4, and passes through circlip for bore 3 and locate at end face.Steering nut 10 is housed on the steering screw 5, and an end of steering screw 5 is equipped with valve body 6 and loam cake 7, and this end of steering screw 5 connects with input shaft 11.The angle of obliquity β of the fan tooth 8 on the pitman shaft 1 is 27.5 °, the outside that oil cylinder housing 2 is installed cylindrical roller bearing 4 is shaped on positioning step, the other end is shaped on positioning groove 12, circlip for bore 3 is installed in the positioning groove 12, and the cylindrical of two outer rings in the valve assembly 16 adopts free-running fit with the endoporus of valve body 6 and loam cake 7 respectively.Safety valve 13 is installed on the valve assembly 16 by being threaded, and communicates with oil inlet 14, return opening 15.High-pressure oil sealing 9 interference are assemblied in the mouth of oil cylinder housing 2.Oil cylinder housing 2 adopts ductile cast iron material QT500-7 to make, and pitman shaft 1 adopts the senior preferably carburizing alloy steel 20CrMnMoH of quenching degree to make.The side cover assembly comprises side cover, cylindrical roller bearing 4, High-pressure oil sealing 9, o shape rubber seal and circlip for bore 3.
This cycle of higher pressure ball power steering is made of mechanics and hydraulic part, and is finished the work by machinery and the combined action of hydraulic pressure two parts.Its principle of work is: the effect of mechanics is the input shaft 11 of steering effort in the steering screw assembly that will be applied on the bearing circle, by the spin screw pair of 10 of steering screw 5 and steering nuts, the left side of input shaft 11 with steering screw 5. the right rotation campaign becomes the crank motion of steering nut 10; Be transformed into the rotation of pitman shaft 1 again through the crank motion of steering nut 10, make pitman arm swing thereupon, and then realize that by the straight and horizontal adjusting rod system vehicle right and left turns to.The effect of hydraulic part is the manipulation light and flexible that makes bearing circle, improves the stability of maneuvering system, turns to lightly thereby make, and reaches the purpose of hydraulic booster.When import oil 14 pressure of oil pump were higher than the settling pressure of safety valve 13, the valve port of safety valve 13 was opened, and fluid flows back to oil tank through return opening 15, thereby played the purpose of protection direction machine.
It is 27.5 ° angle of obliquity that the fan tooth 8 of this cycle of higher pressure ball power steering adopts β, has increased the area of fan tooth 8 tooth roots, thereby has improved the intensity of fan tooth 8, makes the fan tooth 8 of pitman shaft 1 can bear torque load under the 20MPa pressure.The oil cylinder mouth adopts cylindrical roller bearing 4, can bear bigger dynamic load rating and rated static load than needle bearing commonly used.Cylindrical roller bearing 4 in in-oil cylinder locate mode is: axial two ends all have spacing, and an end is located in oil cylinder, and the other end adopts circlip for bore 3 spacing, are radially adopting the less no gap of the magnitude of interference to cooperate like this; Because the magnitude of interference is little, and is more convenient during assembling; And, guaranteed simultaneously the stability that bearing is located again in cylinder body because two ends all have spacingly.
Claims (2)
1. cycle of higher pressure ball power steering, it is by pitman shaft (1), the side cover assembly, steering nut (10), valve assembly (16) and housing assembly (17) constitute, pitman shaft (1) and side cover assembly are contained in the bottom of housing assembly (17), steering nut (10) and valve assembly (16) are contained in the top of housing assembly (17), both are by pitman shaft (1) and steering nut (10) engagement, it is characterized in that: pitman shaft (1) is installed in the mouth of oil cylinder housing (2) by cylindrical roller bearing (4), and pass through circlip for bore (3) and locate at end face, steering nut (10) is housed on the steering screw (5), one end of steering screw (5) is equipped with valve body (6) and loam cake (7), and this end of steering screw (5) connects with input shaft (11); The outside that oil cylinder housing (2) is installed cylindrical roller bearing (4) is shaped on positioning step, the other end is shaped on positioning groove (12), circlip for bore (3) is installed in the positioning groove (12), and the cylindrical of two outer rings in the valve assembly (16) adopts free-running fit with the endoporus of valve body (6) and loam cake (7) respectively; Safety valve (13) is installed in by being threaded on the valve assembly (16), and with oil inlet (14), return opening (15) UNICOM, High-pressure oil sealing (9) interference is assemblied in the mouth of oil cylinder housing (2).
2. a kind of cycle of higher pressure ball power steering according to claim 1 is characterized in that: the angle of obliquity β of the fan tooth (8) on the described pitman shaft (1) is 27.5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202276044U CN201494494U (en) | 2009-08-21 | 2009-08-21 | High-pressure circulating ball power steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202276044U CN201494494U (en) | 2009-08-21 | 2009-08-21 | High-pressure circulating ball power steering gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201494494U true CN201494494U (en) | 2010-06-02 |
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ID=42437702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202276044U Expired - Fee Related CN201494494U (en) | 2009-08-21 | 2009-08-21 | High-pressure circulating ball power steering gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201494494U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939476A (en) * | 2014-04-21 | 2014-07-23 | 湖北三环汽车方向机有限公司 | Novel bearing of automobile steering gear for positioning bearing outer ring |
| CN109131534A (en) * | 2018-10-11 | 2019-01-04 | 杭州世宝汽车方向机有限公司 | A kind of recirculating ball-type steering |
| CN111169530A (en) * | 2018-11-12 | 2020-05-19 | 浙江世宝股份有限公司 | Internal circulation structure of screw and nut assembly for commercial vehicle |
-
2009
- 2009-08-21 CN CN2009202276044U patent/CN201494494U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939476A (en) * | 2014-04-21 | 2014-07-23 | 湖北三环汽车方向机有限公司 | Novel bearing of automobile steering gear for positioning bearing outer ring |
| CN109131534A (en) * | 2018-10-11 | 2019-01-04 | 杭州世宝汽车方向机有限公司 | A kind of recirculating ball-type steering |
| CN111169530A (en) * | 2018-11-12 | 2020-05-19 | 浙江世宝股份有限公司 | Internal circulation structure of screw and nut assembly for commercial vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20120821 |