CN102765419B - Stroke unloading structure for circulating ball-type automobile power steering gear - Google Patents
Stroke unloading structure for circulating ball-type automobile power steering gear Download PDFInfo
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- CN102765419B CN102765419B CN201110117749.0A CN201110117749A CN102765419B CN 102765419 B CN102765419 B CN 102765419B CN 201110117749 A CN201110117749 A CN 201110117749A CN 102765419 B CN102765419 B CN 102765419B
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- steering nut
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- unloading hole
- unloading
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Abstract
The invention belongs to the technology of the automobile power steering gear, and relates to an improvement on a circulating ball-type automobile power steering gear. A stroke unloading structure for the circulating ball-type automobile power steering gear comprises a lower shell (1) of the steering gear, a steering nut (2) and a combined seal assembly (3), wherein the combined seal assembly (3) is positioned in a seal groove on a right-end cylindrical surface of the steering nut (2). The stroke unloading structure for a circulating ball-type automobile power steering gear is characterized in that the inner wall of the upper part of the inner cavity of the lower shell (1) is provided with a circular-arc groove (6) which extends along the circumference direction; the upper part of the right end surface of the steering nut (2) is provided with a blind hole (7); the steering nut (2) is provided with a left unloading hole (10) and a right unloading hole (8) which are communicated with the blind hole (7); and an annular groove (9) is arranged between the outer end hole of the left unloading hole (10) and the outer end hole of the right unloading hole (8) on the cylindrical surface of the steering nut (2). The stroke unloading structure for a circulating ball-type automobile power steering gear, disclosed by the invention, has the advantages of simple structure, small part amount, small processing difficulty and low cost.
Description
Technical field
The invention belongs to automobile power steering technology, relate to the improvement to automobile circulating ball type power steering gears.
Background technology
Chinese invention patent application " piston travel unloading mechanism of automobile power steering gear " (application number: 200910136297.3) disclose a kind of stroke unloading-structure of automobile circulating ball type power steering gears, the trip unloading mechanism is installed with the parts such as left valve seat, the first seal ring, left spool, guide rod, retracing spring, right valve seat, right spool, the second seal ring and valve casing in steering nut inside.Its shortcoming is: need to, at inner two check valves and two trigger mechanisms installed of steering nut, make the structure of stroke unloading-structure very complicated, difficulty of processing be larger, and cost is high.
Summary of the invention
The object of the invention is: proposition one is simple in structure, difficulty of processing is little, the automobile circulating ball type power steering gears stroke unloading-structure that cost is low.
Technical scheme of the present invention is: automobile circulating ball type power steering gears stroke unloading-structure, comprise deflector lower house 1, steering nut 2 and the combination sealing assembly 3 that is positioned at seal groove on the steering nut 2 right-hand member faces of cylinder, have with the tooth on rocker shaft 11 and fan the tooth bar engaging in steering nut 2 left end bottoms, the right-hand member of steering nut 2 inserts in the cylindrical right chamber 4 of lower house 1 and keeps free-running fit, combination sealing assembly 3 is by the clearance seal between steering nut 2 Yu You chamber, the right-hand member face of cylinder 4 inwalls, steering nut 2 left sides and following lower housing cavity form left chamber 5, right chamber 4 and left the chamber 5 respectively oil circuit by lower house 1 inside are communicated with rotary valve mechanism corresponding port, the upper inside wall laminating of the first half face of cylinder of steering nut 2 and lower house 1 inner chamber, there is an arc groove 6 along the circumferential direction stretching in the upper inside wall of lower house 1 inner chamber, on the face of cylinder of steering nut 2, have an annular groove 9, it is characterized in that,
(1) this arc groove 6 is L along the axial width of steering nut 2, and the degree of depth of this arc groove 6 is t=1.5mm～2mm, and the distance between the vertical split of these arc groove 6 broad wayss and the vertical split of rocker shaft 11 is D=0mm～80mm;
(2) there is a blind hole 7 perpendicular to right side on the top of the right side of steering nut 2, there are a left unloading hole 10 and right unloading hole 8 on the top on steering nut 2 faces of cylinder, the external port of left unloading hole 10 and right unloading hole 8 is positioned at the upper surface on steering nut 2 faces of cylinder, the inner port of left unloading hole 10 is communicated with the left end of blind hole 7, and the inner port of right unloading hole 8 is communicated with the right part of blind hole 7; Annular groove 9 is between left unloading hole 10 and the external port of right unloading hole 8, left unloading hole 10 equates to the distance of annular groove 9 right hand edges with right unloading hole 8 to the distance of annular groove 9 left hand edges, this is less than the width L of arc groove 6 on steering nut 2 apart from m, in the time that steering nut 2 is positioned at left unloaded position, arc groove 6 is communicated with right unloading hole 8 with annular groove 9, right chamber 4 is communicated with left chamber 5 by blind hole 7, right unloading hole 8, arc groove 6 and annular groove 9; In the time that steering nut 2 is positioned at right unloaded position, arc groove 6 is communicated with left unloading hole 10 with annular groove 9, and left chamber 5 is communicated with right chamber 4 by annular groove 9, arc groove 6, left unloading hole 10 and blind hole 7.
Advantage of the present invention is: simple in structure, the quantity of part is few, and difficulty of processing is little, and cost is low.One embodiment of the present of invention, cost is only below 10% of existing stroke unloading-structure.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the enlarged drawing of local A in the present invention.
Detailed description of the invention
Below the present invention is described in further details.Referring to Fig. 1, 2, automobile circulating ball type power steering gears stroke unloading-structure, comprise deflector lower house 1, steering nut 2 and the combination sealing assembly 3 that is positioned at seal groove on the steering nut 2 right-hand member faces of cylinder, have with the tooth on rocker shaft 11 and fan the tooth bar engaging in steering nut 2 left end bottoms, the right-hand member of steering nut 2 inserts in the cylindrical right chamber 4 of lower house 1 and keeps free-running fit, combination sealing assembly 3 is by the clearance seal between steering nut 2 Yu You chamber, the right-hand member face of cylinder 4 inwalls, steering nut 2 left sides and following lower housing cavity form left chamber 5, right chamber 4 and left the chamber 5 respectively oil circuit by lower house 1 inside are communicated with rotary valve mechanism corresponding port, the upper inside wall laminating of the first half face of cylinder of steering nut 2 and lower house 1 inner chamber, there is an arc groove 6 along the circumferential direction stretching in the upper inside wall of lower house 1 inner chamber, on the face of cylinder of steering nut 2, have an annular groove 9, it is characterized in that,
(1) this arc groove 6 is L along the axial width of steering nut 2, and the degree of depth of this arc groove 6 is t=1.5mm～2mm, and the distance between the vertical split of these arc groove 6 broad wayss and the vertical split of rocker shaft 11 is D=0mm～80mm;
(2) there is a blind hole 7 perpendicular to right side on the top of the right side of steering nut 2, there are a left unloading hole 10 and right unloading hole 8 on the top on steering nut 2 faces of cylinder, the external port of left unloading hole 10 and right unloading hole 8 is positioned at the upper surface on steering nut 2 faces of cylinder, the inner port of left unloading hole 10 is communicated with the left end of blind hole 7, and the inner port of right unloading hole 8 is communicated with the right part of blind hole 7; Annular groove 9 is between left unloading hole 10 and the external port of right unloading hole 8, left unloading hole 10 equates to the distance of annular groove 9 right hand edges with right unloading hole 8 to the distance of annular groove 9 left hand edges, this is less than the width L of arc groove 6 on steering nut 2 apart from m, in the time that steering nut 2 is positioned at left unloaded position, arc groove 6 is communicated with right unloading hole 8 with annular groove 9, right chamber 4 is communicated with left chamber 5 by blind hole 7, right unloading hole 8, arc groove 6 and annular groove 9; In the time that steering nut 2 is positioned at right unloaded position, arc groove 6 is communicated with left unloading hole 10 with annular groove 9, and left chamber 5 is communicated with right chamber 4 by annular groove 9, arc groove 6, left unloading hole 10 and blind hole 7.
Principle of work of the present invention is: in motor turning process, in the time arriving off-load required angle, deflector internal turn nut arrives unloaded position simultaneously, high pressure chest is communicated with low-pressure cavity, makes to let out in inner fluid, reduces high pressure chest power-assisted oil pressure, reduce output torque, reach off-load object.
In the time that steering nut 2 requires to be moved to the left according to motor turning, right chamber 4 is high pressure chest, high-voltage oil liquid promotes steering nut 2 and is moved to the left, play the effect of fluid power-assisted, now left unloading hole 10 and right unloading hole 8 are sealed by lower house upper inside wall, poted assemblies 3 separates left chamber 5 with right chamber 4 simultaneously, left chamber 5 is not communicated with right chamber 4, when moving to left, the right unloading hole 8 on steering nut 2 enters arc groove 6 when inner, arc groove 6 is communicated with right unloading hole 8 with annular groove 9, make the high pressure oil in right chamber 4 by blind hole 7, right unloading hole 8, arc groove 6 and annular groove 9 are communicated with left chamber 5 and oil return, reach off-load object,
In the time that steering nut 2 requires to move right according to motor turning, left chamber 5 is high pressure chest, high-voltage oil liquid promotes steering nut 2 and moves right, play the effect of fluid power-assisted, now left unloading hole 10 and right unloading hole 8 are sealed by lower house upper inside wall, poted assemblies 3 separates left chamber 5 with right chamber 4 simultaneously, left chamber 5 is not communicated with right chamber 4, when moving to right, the left unloading hole 10 on steering nut 2 enters arc groove 6 when inner, arc groove 6 is communicated with left unloading hole 10 with annular groove 9, make the high pressure oil in left chamber 5 by annular groove 9, arc groove 6, left unloading hole 10, blind hole 7 is communicated with right chamber 4 and oil return, reach off-load object.
Following table provides the supplemental characteristic of 3 embodiment of the present invention.Unit is mm.
| ? | L | t | D | m | d |
| Example 1 | 12 | 2 | 20 | 15 | 3 |
| Example 2 | 10 | 1.5 | 15 | 15 | 3 |
| Example 3 | 8 | 1.5 | 15 | 12 | 2 |
The cost of above-described embodiment be only existing unloading-structure less than 1/10th.
Claims (2)
1. automobile circulating ball type power steering gears stroke unloading-structure, comprise deflector lower house [1], steering nut [2] and be positioned at the combination sealing assembly [3] of seal groove on steering nut [2] the right-hand member face of cylinder, have with the tooth on rocker shaft [11] and fan the tooth bar engaging in steering nut [2] left end bottom, the right-hand member of steering nut [2] inserts in the cylindrical right chamber [4] of lower house [1] and keeps free-running fit, combination sealing assembly [3] is by the clearance seal between the inwall of Yu You chamber, steering nut [2] the right-hand member face of cylinder [4], steering nut [2] left side and following lower housing cavity form left chamber [5], right chamber [4] and left chamber [5] are communicated with rotary valve mechanism corresponding port by the inner oil circuit of lower house [1] respectively, the upper inside wall laminating of the first half face of cylinder of steering nut [2] and lower house [1] inner chamber, there is an arc groove [6] along the circumferential direction stretching in the upper inside wall of lower house [1] inner chamber, on the face of cylinder of steering nut [2], have an annular groove [9], it is characterized in that,
(1) this arc groove [6] is L along the axial width of steering nut [2], and the degree of depth of this arc groove [6] is t=1.5mm～2mm, and the distance between the vertical split of this arc groove [6] broad ways and the vertical split of rocker shaft [11] is D=0mm～80mm;
(2) there is a blind hole perpendicular to right side [7] on the top of the right side of steering nut [2], there are a left unloading hole [10] and right unloading hole [8] on the top on steering nut [2] face of cylinder, the external port of left unloading hole [10] and right unloading hole [8] is positioned at the upper surface on steering nut [2] face of cylinder, the inner port of left unloading hole [10] is communicated with the left end of blind hole [7], and the inner port of right unloading hole [8] is communicated with the right part of blind hole [7]; Annular groove [9] is positioned between left unloading hole [10] and the external port of right unloading hole [8], left unloading hole [10] equates to the distance of annular groove [9] right hand edge with right unloading hole [8] to the distance of annular groove [9] left hand edge, this is less than the width L of the upper arc groove [6] of steering nut [2] apart from m, in the time that steering nut [2] is positioned at left unloaded position, arc groove [6] is communicated with right unloading hole [8] with annular groove [9], right chamber [4] is communicated with left chamber [5] by blind hole [7], right unloading hole [8], arc groove [6] and annular groove [9]; In the time that steering nut [2] is positioned at right unloaded position, arc groove [6] is communicated with left unloading hole [10] with annular groove [9], and left chamber [5] is communicated with right chamber [4] by annular groove [9], arc groove [6], left unloading hole [10] and blind hole [7].
2. stroke unloading-structure according to claim 1, is characterized in that, the aperture of said right unloading hole [8] and left unloading hole [10] is d=2mm～6mm, and the aperture of blind hole [7] is not less than d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110117749.0A CN102765419B (en) | 2011-05-06 | 2011-05-06 | Stroke unloading structure for circulating ball-type automobile power steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110117749.0A CN102765419B (en) | 2011-05-06 | 2011-05-06 | Stroke unloading structure for circulating ball-type automobile power steering gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102765419A CN102765419A (en) | 2012-11-07 |
| CN102765419B true CN102765419B (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110117749.0A Active CN102765419B (en) | 2011-05-06 | 2011-05-06 | Stroke unloading structure for circulating ball-type automobile power steering gear |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3896702A (en) * | 1973-07-27 | 1975-07-29 | Trw Inc | Power steering gear with relief valve on power piston |
| US4648307A (en) * | 1985-10-10 | 1987-03-10 | Trw, Inc. | Unloading valve for power steering piston with integral gear |
| US5419235A (en) * | 1994-02-28 | 1995-05-30 | Trw Inc. | Power steering gear assembly |
| CN2366333Y (en) * | 1999-03-24 | 2000-03-01 | 荆州恒隆汽车零部件制造有限公司 | Rotation type limiting unloading valve for automobile power-driven steering device |
| CN100343106C (en) * | 2005-12-27 | 2007-10-17 | 江苏罡阳股份有限公司 | Built-in positioning unloading device of automobile power steering gear |
| CN101537852A (en) * | 2009-05-06 | 2009-09-23 | 豫北(新乡)汽车动力转向器有限公司 | Piston travel unloading mechanism of automobile power steering gear |
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- 2011-05-06 CN CN201110117749.0A patent/CN102765419B/en active Active
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Address after: 453003 No. 322 Heping Avenue, Henan, Xinxiang Patentee after: YUBEI STEERING SYSTEM (XINXIANG) CO.,LTD. Address before: 453003 No. 322 Heping Avenue, Henan, Xinxiang Patentee before: YUBEI STEERING SYSTEM Co.,Ltd. |
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Address after: 2398 Muye Avenue, high tech Zone, Xinxiang City, Henan Province Patentee after: North Henan Steering System (Xinxiang) Co.,Ltd. Address before: 453003 No. 322 Heping Avenue, Henan, Xinxiang Patentee before: YUBEI STEERING SYSTEM (XINXIANG) CO.,LTD. |
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| CP03 | Change of name, title or address |