JP2007223539A - Power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power steering device improved in pipe fitting workability by simplifying pipe fitting structure. <P>SOLUTION: In the power steering device 10 movably housing a rack shaft 12 interlocked with a steering input shaft 22 in a steering gear housing 11 and provided with a fitting 30 fixed to the steering gear housing 11 so as to fit the steering gear housing to a vehicle body and the pipe 60 for leading a pressure fluid, a fixing part 71 of a fitting stay 70 to which the pipe 60 is to be fitted is fastened to a fixing part 31 of the fitting 30 with a bolt. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power steering apparatus.

As a power steering device, as described in Patent Document 1, a rack shaft interlocking with a steering input shaft is movably accommodated in a steering gear housing, and fixed to the steering gear housing and attached to the vehicle body side. There is a thing provided with piping which guides pressure fluid. Japanese Patent Application Laid-Open No. H10-228707 discloses a method for attaching a pipe by fastening a belt-like dedicated fixture to a power cylinder of a steering gear housing and bolting a bracket attached to the pipe to the fixture. . A positioning member for positioning the mounting position of the pipe with respect to the power cylinder is provided in the mounting tool.
Reality 7-383

The piping mounting structure of Patent Document 1 has the following problems.
(1) It is necessary to prepare a dedicated fixture that can only be used to install the pipe and fasten this fixture to the power cylinder.

  (2) It is necessary to provide a positioning member for positioning the mounting position (directivity) of the pipe in the fixture, and it is necessary to align this positioning member with a specific position with respect to the power cylinder.

  An object of the present invention is to simplify a pipe mounting structure and improve pipe mounting workability in a power steering apparatus.

  According to a first aspect of the present invention, a rack shaft that is linked to a steering input shaft is movably accommodated in a steering gear housing, and includes a fixture that is fixed to the steering gear housing and attaches the steering gear housing to the vehicle body side. In the power steering apparatus including a pipe for guiding the pipe, the fixing portion of the mounting stay to which the pipe is attached is bolted to the fixing part of the fixture.

  According to a second aspect of the present invention, in the first aspect of the invention, the mounting stay further includes an arc-shaped concave portion that allows the piping to be fitted therein, and a clip plate that allows the piping to be clamped between the concave portion and the mounting plate. It can be bolted to the stay.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the fixing portion of the fixture further has an arcuate outer edge portion centered on the bolt hole, and a detent portion protruding outward from one end of the outer edge portion. The fixing portion of the mounting stay moves along the arcuate outer edge portion of the mounting tool, and includes a claw that can be locked to the detent portion of the mounting tool.

(Claim 1)
(a) A mounting tool for mounting the steering gear housing on the vehicle body side is also used for piping. Therefore, the number of parts for pipe installation can be reduced and the pipe installation workability can be improved.

  (b) Attach piping to a mounting stay that is fixed by bolting to a fixture fixed to the steering gear housing. Therefore, the mounting position (direction) of the pipe with respect to the steering gear housing by the mounting stay fixed to the fixture is uniquely determined, and the pipe mounting workability can be improved.

(Claim 2)
(c) The pipe is fitted into the arcuate recess of the mounting stay and is sandwiched between the sandwich plates. Therefore, the detachability of the piping with respect to the mounting stay is simple and reliable.

(Claim 3)
(d) In the process of bolting the fixing part of the mounting stay to the fixing part of the mounting tool, the pawl of the mounting stay moves along the arcuate outer edge of the mounting tool, and at the moving end to the anti-rotating part of the mounting tool. Stop and stop. Therefore, the fixing position of the mounting stay with respect to the fixture can be easily adjusted by swinging around the bolt, and the piping installation workability can be improved, for example, by finely adjusting the mounting position (directionality) of the piping.

  1 is an overall cross-sectional view showing a power steering device, FIG. 2 is a cross-sectional view of the main part of FIG. 1, FIG. 3 is a view taken in the direction of arrow III in FIG. 5 is a schematic view showing an attachment stay, and FIG. 6 is a schematic view showing a sandwiching plate.

  As shown in FIG. 1, the hydraulic power steering apparatus 10 includes a rack shaft 12 that is supported by a rack shaft housing portion 11 </ b> A of the steering gear housing 11 so as to be linearly movable and includes a power cylinder 13. A piston (not shown) is provided on the penetrating rack shaft 12, and a first chamber (not shown) and a second chamber 15B partitioned by the piston (not shown) are formed inside the power cylinder 13. In the hydraulic power steering apparatus 10, the left and right tie rods 17 </ b> A and 17 </ b> B are connected to the rack shaft 12 to assist the steering force of the steering wheel by the driver.

  In the hydraulic power steering apparatus 10, a valve body 21 of a control valve 20 is fixed to a steering gear housing 11. The control valve 20 pivotally supports an input shaft 22 that rotates in conjunction with the steering wheel on the valve body 21, and includes a circular rotor (not shown) integrated with the input shaft 22 and a torsion bar 22 </ b> A fixed to the input shaft 22. A circular sleeve (not shown) fixed together with a pinion (not shown) at the tip is coaxially arranged so as to be relatively displaceable by elastic torsional deformation of the torsion bar 22A according to the steering torque applied to the steering wheel. The pump-side supply channel and the tank-side return channel are switched in accordance with the steering operation to the first and second supply / discharge channels 16A, 16B connected to the first chamber (not shown) and the second chamber 15B, respectively. Connecting. A pinion (not shown) fixed to the sleeve (not shown) is meshed with the rack teeth of the rack shaft 12.

  The hydraulic power steering device 10 includes mounting portions 18 and 19 on one side along the longitudinal direction of the rack shaft housing portion 11A of the steering gear housing 11 and a mounting tool 30 on the other side. In the hydraulic power steering apparatus 10, the mounting portions 18 and 19 are integrally formed when the steering gear housing 11 is cast, and bolts inserted into the mounting holes 18A and 19A are screwed to the support portions (screw holes) of the body frame. At the same time, the steering gear housing 11 is held by the fixture 30 fixed to the steering gear housing 11, and a bolt inserted into the mounting hole 30A is screwed to the support portion (screw hole) of the vehicle body frame. As a result, the steering gear housing 11 is fixedly mounted at a predetermined mounting position with respect to the vehicle body frame. Hereinafter, the fixture 30 will be described.

  The fixture 30 has a bracket 40 and a collar 50 as shown in FIGS. The bracket 40 includes a substantially C-shaped holding portion 41 that holds the power cylinder 13 of the steering gear housing 11, and extends outward from both ends of the C-shape of the holding portion 41 to be parallel to each other. A pair of opposing joining pieces 42 is provided. The bracket 40 can be formed by pressing a plate material having a constant plate width. The collar 50 is made of a pipe material and is inserted into holes 42 </ b> A provided in the pair of joining pieces 42 of the bracket 40.

  The fixture 30 is held at each of a plurality of circumferential positions (four positions in this embodiment) of the holding portion 41 in a state where the holding portion 41 of the bracket 40 is held by the power cylinder 13 of the steering gear housing 11. Laser beam welding (or arc welding is possible) of the inner surface of the slit 41A extending in the plate width direction of the holding portion 41 to the outer periphery of the power cylinder 13 (welding portion 43). In addition, the fixture 30 is a state in which the collar 50 is inserted into each hole 42A of the pair of joining pieces 42 of the bracket 40, and the outward face of each joining piece 42 (when the steering gear housing 11 is viewed in the vertically arranged state). The upper surface of the upper joint piece 42 and the lower surface of the lower joint piece 42 are welded to the outer periphery of the collar 50 by laser beam welding (or arc welding is also possible). The welded portion 44 is provided at a plurality of circumferential positions along the outer periphery of the collar 50 (or the entire circumference is acceptable).

  As shown in FIGS. 2 and 3, the mounting tool 30 has a mounting bush 51 fitted on the inner periphery of the collar 50, and the mounting bush 51 has an inner diameter as the mounting hole 30 </ b> A. In FIG. 2, 13A is a cylinder end provided at one end of the power cylinder 13, 13B is an oil seal, and the bracket 40 of the fixture 30 is inserted between the cylinder end 13A and the cylinder end 13A. The outer diameter portion of the portion that is expanded so as to form an annular gap is held.

  However, as shown in FIGS. 1 and 4, the hydraulic power steering apparatus 10 includes a pipe 60 that extends from the intake / exhaust device such as a pump to the valve body 21 of the control valve 20 to guide the pressure fluid, and this pipe 60 is attached to the hydraulic power steering 10 apparatus. The fixing portion 71 of the mounting stay 70 is bolted to the fixing portion 31 formed integrally with the mounting tool 30 using bolts 91A and nuts 91B. The bolt 91 </ b> A is inserted through bolt holes 31 </ b> A and 71 </ b> A provided in the fixing portions 31 and 71. The nut 91 </ b> B is welded to the back surface of the fixed portion 31.

  As shown in FIG. 5, the mounting stay 70 is formed by bending an arcuate recess 73 at the tip of an upright part 72 that is bent at a right angle from one end of the fixed part 71, and the pipe 60 can be fitted into the arcuate recess 73. To do. A sandwich plate 80 shown in FIG. 6 is attached to the surface of the upright portion 72 of the mounting stay 70. The sandwiching plate 80 has the same width as that of the upright portion 72 of the mounting stay 70 or a narrow width, and is bolted to the upright portion 72 by a bolt 92A and a nut 92B. The distal end bending portion 81 of the sandwiching plate 80 can be clamped between the arcuate recess 73 of the mounting stay 70. The pipe 60 is covered with a cushion 61 made of a rubber tube or the like, and is sandwiched between the arcuate recess 73 of the mounting stay 70 and the distal end bending portion 81 of the sandwich plate 80 via the cushion 61. The cushion 61 is longer than the plate width of the upright portion 72 of the mounting stay 70, and is provided with both end flanges 61 </ b> A and 61 </ b> A and is prevented from coming off from the recess 73. The nut 92 </ b> B is welded to the back surface of the upright portion 72.

  Here, as shown in FIG. 3, the fixing portion 31 of the fixture 30 includes an arcuate outer edge portion 32 centering on the bolt hole 31 </ b> A, and a protrusion-like detent protruding outward from one end of the arcuate outer edge portion 32. The unit 33 is provided. The fixing portion 71 of the mounting stay 70 bolted to the fixing portion 31 of the fixture 30 is temporarily fixed to the fixing portion 31 of the fixture 30 via the bolt 91A, and the arc-shaped outer edge portion 32 of the fixing portion 31. A claw 74 that swings around the bolt 91 </ b> A so as to move along the lock and that can be locked to the detent portion 33 of the fixing portion 31 is provided, and the bolting position to the fixing portion 31 can be finely adjusted in the moving range. To be.

Therefore, the installation procedure of the pipe 60 is as follows.
(1) The fixing portion 71 of the mounting stay 70 is bolted to the fixing portion 31 of the fixture 30 with a bolt 91A. At this time, the fixing portion 71 of the mounting stay 70 is swung around the bolt 91A within a moving range in which the claw 74 is engaged with the anti-rotation portion 33 along the arc-shaped outer edge portion 32 of the fixing portion 31. The stop position is finely adjusted.

  (2) The pipe 60 is fitted into the arcuate recess 73 of the mounting stay 70 via the cushion 61, and the clamping plate 80 sandwiching the pipe 60 is bolted to the standing part 72 of the mounting stay 70 using the bolt 92 </ b> A.

According to the present embodiment, the following operational effects can be obtained.
(a) The mounting tool 30 for mounting the steering gear housing 11 on the vehicle body side is also used for mounting the pipe 60. Therefore, the number of parts for mounting the pipe 60 can be reduced, and the mounting workability of the pipe 60 can be improved.

  (b) The pipe 60 is attached to the mounting stay 70 that is bolted to the fixture 30 fixed to the steering gear housing 11 and fixed. Therefore, the mounting position (direction) of the pipe 60 with respect to the steering gear housing 11 by the mounting stay 70 fixed to the fixture 30 is uniquely determined, and the mounting workability of the pipe 60 can be improved.

(Claim 2)
(c) The pipe 60 is fitted into the arcuate recess 73 of the mounting stay 70 and is sandwiched by the sandwiching plate 80. Therefore, the detachability of the pipe 60 with respect to the mounting stay 70 is simple and reliable.

(Claim 3)
(d) In the process of bolting the fixing portion 71 of the mounting stay 70 to the fixing portion 31 of the mounting tool 30, the claw 74 of the mounting stay 70 moves along the arcuate outer edge portion 32 of the mounting tool 30, and the moving end thereof Then, it is locked by the rotation preventing portion 33 of the fixture 30 and stopped. Therefore, the fixing position of the mounting stay 70 with respect to the mounting tool 30 can be easily adjusted by swinging around the bolt 91A, and the mounting workability of the pipe 60 such as easily adjusting the mounting position (directionality) of the pipe 60 can be performed. Can be improved.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is an overall cross-sectional view showing a power steering apparatus. FIG. 2 is a cross-sectional view of the main part of FIG. FIG. 3 is a view in the direction of the arrow III in FIG. FIG. 4 is an arrow view in the IV direction of FIG. FIG. 5 is a schematic view showing the mounting stay. FIG. 6 is a schematic view showing a sandwiching plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power steering apparatus 11 Steering gear housing 12 Rack shaft 22 Input shaft 30 Fixing tool 31 Fixing part 31A Bolt hole 32 Arc-shaped outer edge part 33 Anti-rotation part 60 Pipe 70 Mounting stay 71 Fixing part 71A Bolt hole 74 Claw 73 Arc-shaped recessed part 80 Clipping plate 91A bolt

Claims (3)

A rack shaft that is linked to the steering input shaft is movably accommodated in the steering gear housing, and includes a fitting that is fixed to the steering gear housing and attaches the steering gear housing to the vehicle body side, and a pipe that guides the pressure fluid. In the power steering device,
A power steering device, wherein a fixing portion of an attachment stay to which the pipe is attached is bolted to a fixing portion of the fixture.   2. The power steering according to claim 1, wherein the mounting stay includes an arc-shaped recess that allows the piping to be fitted therein, and a clip plate that allows the piping to be clamped between the mounting stay is bolted to the mounting stay. apparatus. The fixing portion of the fixture comprises an arcuate outer edge centered on the bolt hole, and a detent portion projecting outward from one end of the outer edge,
3. The power steering device according to claim 1, further comprising a claw that allows the fixing portion of the mounting stay to move along an arcuate outer edge portion of the mounting tool and be locked to a rotation stopper of the mounting tool.

Images