JP2008168692A - Power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power steering device making automatic steering control. <P>SOLUTION: A driving pin 32 is pressed into a driving pin insertion hole 8b bored in an input shaft 8, and an output shaft 7 connected to the input shaft 8 through a torsion bar 9 is formed with a plunger housing hole 7c, and a plunger 33 is arranged in the plunger insertion hole 7c freely to move forward and backward. The driving pin 32 is projected outside in the radial direction from the input shaft 8 in one end thereof, and on the other hand, the other end thereof is made to abut on the torsion bar 9, and the plunger 33 pushes the driving pin 32 so as to give the torque to the input shaft 8 with a contact between inclined surfaces of the both for automatic steering control. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power steering device that assists a driver's steering force with hydraulic pressure, and more particularly to an integral type power steering device mainly used in a large vehicle.

  In this type of power steering apparatus, a control valve is formed between the input and output shafts, and the hydraulic pressure supplied to the steering hydraulic power cylinder is controlled by the torsion of the torsion bar interposed between the input and output shafts. It is like that. For example, Patent Literature 1 discloses a power steering apparatus including a reaction force mechanism that generates a steering reaction force by hydraulic pressure in order to make the driver sense steering resistance.

In the reaction force mechanism described in Patent Document 1, a concave portion having a V-shaped cross section is formed on an input shaft, a ball held by a plunger on the output shaft side is seated in the concave portion, and the ball is held by the plunger with the input shaft. It presses to the side. That is, when the center of the ball and the center of the recess are offset in the circumferential direction of the input / output shaft, the plunger presses the ball toward the input shaft by the hydraulic pressure from the pump, thereby tilting the ball and the recess. With the surface contact, a torque is generated to make the concave portion and the center of the ball coincide with each other on the input shaft. The torque is transmitted as the steering reaction force of the steering wheel.
JP-A-3-258658

  By the way, it is conceivable that, for example, when the driver is instinctively sleepy, the vehicle fluctuates or moves to the adjacent travel lane beyond the white line of the road. In such a case, for example, if the vehicle deviates from the driving lane and can be automatically steered to return the vehicle to the original driving lane or prompt the return, the vehicle can be driven more safely. Can be made.

  Therefore, for example, when a deviation from the traveling lane of the vehicle is recognized, torque is applied to the input shaft using the reaction force mechanism described in Patent Document 1, and the opening of the control valve is positively changed. Some techniques for automatically controlling steering by performing steering assist have been proposed.

  However, since the technique described in Patent Document 1 does not consider performing automatic steering control, if automatic steering control is performed as described above with this technique, the contact point between the ball and the recess from the rotation center of the input shaft. The torque required for automatic steering could not be applied to the input shaft.

  In addition, since the ball is seated in the recess, the shape error of the ball and the shape error of the recess accumulate, resulting in variations in the position of the contact point between the ball and the recess, which hinders smooth operation.

  The present invention has been made in view of the above problems, and in particular, an object of the present invention is to provide a power steering device capable of increasing the torque applied to the input shaft and performing automatic steering control.

  The present invention has a torsion bar housing hole along the axial direction on one end side, and has a plurality of input shaft side radial holes that penetrate the peripheral wall portion of the torsion bar housing hole in the radial direction. An input shaft having the other end connected to the steering wheel, a torsion bar having at least one end inserted into a torsion bar receiving hole of the input shaft, and an external connection to one end of the input shaft. An input shaft containing portion that surrounds the outer peripheral side of the area where the bar is inserted, an output shaft connected to the input shaft via the torsion bar, and an input / output formed between the input shaft and the output shaft A control valve that selectively supplies hydraulic oil supplied from a pump according to the relative rotation of the shaft to both hydraulic chambers of the hydraulic power cylinder for steering, and each input shaft side radial hole, A plurality of drive pins whose ends protrude radially outward from the input shaft and whose other ends are in contact with the outer peripheral surface of the torsion bar, and a plurality of output shaft side diameters formed in the input shaft housing portion in the radial direction A plunger that is housed in each of the direction holes so as to be able to move forward and backward, and that relatively rotates the input / output shaft by pressing each drive pin, and each output shaft side according to at least one of the situation of the vehicle, the driver, and the road And a hydraulic pressure supply section that supplies hydraulic pressure to each of the radial holes.

  Therefore, in the present invention, one end of the drive pin embedded in the input shaft protrudes radially outward from the input shaft, and the plunger presses the drive pin, so that the contact point between the drive pin and the piston from the rotation center of the input shaft. A long distance can be secured, and the torque generated in the input shaft increases.

  In addition, since the other end of the drive pin is abutted against the torsion bar, the protrusion amount of the drive pin from the input shaft is not affected by the processing accuracy on the input shaft side, and there is an advantage that the accuracy of the protrusion amount is improved. is there.

  FIG. 1 is a view showing a more specific embodiment of the present invention, and is an axial sectional view of a power steering device.

  As shown in FIG. 1, the housing 1 of the power steering apparatus includes a cylinder housing 2 and a valve housing 3, and the cylinder housing 2 has a substantially bottomed cylindrical shape. A piston 4 is accommodated in the cylinder chamber 2a of the cylinder housing 2 so as to be capable of moving forward and backward. The piston 4 divides the cylinder chamber 2a into a right steering pressure chamber 2b and a left steering pressure chamber 2c. Further, a sector shaft housing chamber 2d is formed on the side of the cylinder chamber 2a in the cylinder housing 2, and a part of the sector shaft 5 is housed in the sector shaft housing chamber 2d. The sector shaft 5 is disposed perpendicular to the cylinder chamber 2a and is connected to a steering wheel (not shown) via a tie rod (not shown).

  A rack portion 4 a made up of three teeth is formed on a portion of the outer peripheral surface of the piston 4 facing the sector shaft 5. The rack portion 4a meshes with the tooth portion 5a of the sector shaft 5, and converts the forward / backward movement of the piston 4 into the rotational motion of the sector shaft 5 to give a steering angle to a steered wheel (not shown).

  A substantially cylindrical output shaft 7 is connected to the piston 4 via a ball screw mechanism 6. That is, the output shaft 7 is disposed along the axial direction of the cylinder chamber 2 a, and the rotational motion of the output shaft 7 is converted into the forward and backward motion of the piston 4.

  The valve housing 3 is coupled to the opening side end of the cylinder housing 2, and the input shaft 8 is disposed in the valve housing 3 with the output shaft 7 aligned with the axis. One end of the input shaft 8 is inserted into the end of the output shaft 7 opposite to the piston 4, and the input shaft 8 and the output shaft 7 are connected via a torsion bar 9. In other words, a torsion bar accommodating hole 8a is formed at one end of the input shaft 8, and after inserting one end of the torsion bar 9 into the torsion bar accommodating hole 8a, the torsion bar 9 and the input shaft 8 are connected with the fastening pin 10. On the other hand, the other end of the torsion bar 9 is connected to the piston 4 side end of the output shaft 7 with a fastening pin 11.

  The input shaft 8 is rotatably supported by the valve housing 3 with a bearing 12, while the output shaft 7 is rotatably supported by the valve housing 3 with a bearing 13.

  The other end of the input shaft 8 protrudes from the valve housing 3 and is connected to a steering wheel (not shown).

  That is, when a steering wheel (not shown) is rotated to rotate the input shaft 8, the rotation is transmitted to the output shaft 7 via the torsion bar 9, and the rotational motion of the output shaft 7 is the forward / backward motion of the piston 4. Further, the forward / backward movement of the piston 4 is converted into the rotational movement of the sector shaft 5 and the steered wheels (not shown) are steered. At the same time, by selectively supplying hydraulic oil to the pressure chambers 2b and 2c from a pump (not shown) that functions as a hydraulic pressure source, a differential pressure is generated between the pressure chambers 2b and 2c so that the steering force is assisted. It has become. In other words, the cylinder chamber 2a and the piston 4 function as a power cylinder of the power steering device.

  Both pressure chambers 2b and 2c communicate with a pump (not shown) via a control valve 14 formed between the input shaft 8 and the output shaft 7. The control valve 14 is a so-called rotary valve, and is a valve mechanism that introduces or discharges hydraulic oil to and from the hydraulic chambers 2b and 2c in response to relative rotation between the input shaft 8 and the output shaft 7, that is, torsion of the torsion bar 9. Function as.

  Specifically, the control valve 14 is composed of a valve body 7a formed at the end of the output shaft 7 on the side opposite to the piston 4 and a substantially cylindrical rotor 15 disposed on the inner peripheral side of the valve body 7a. It is configured. The rotor 15 is extrapolated to the input shaft 8 and is coupled to the input shaft 8 with a fastening pin 16 so as not to be relatively rotatable.

  That is, the control valve 14 is connected to the right steering pressure chamber 2b via the first oil passage 17 and the second oil passage 18, and when the rotor 15 and the valve body 7a are relatively rotated in the right steering direction, the pump pressure is increased to the right. It will be led to the steering pressure chamber 2b. On the other hand, the left steering pressure chamber 2c is connected to the control valve 14 via the third oil passage 19 and the fourth oil passage 20, and when the rotor 15 and the valve body 7a are relatively rotated in the left steering direction, the pump pressure is increased. It will be guided to the left steering pressure chamber 2c. The right steering pressure chamber 2b and the sector shaft storage chamber 2d are always in communication with each other through the fifth oil passage 21, and the meshing portion between the tooth portion 5a and the rack portion 4a is lubricated. .

  On the piston 4 side of the control valve 14, left rotation and right rotation input shaft drive units 22 and 23 for driving the input shaft 8 by hydraulic pressure are provided, respectively, and left rotation and right rotation input shaft drive units 22 and 23 are provided. A left rotation spool valve 24 and a right rotation spool valve 24 for supplying hydraulic oil to the hydraulic fluid 23 are provided on the outer peripheral side of the valve housing 3.

  The left rotation and right rotation input shaft driving units 22 and 23 are actuators that respectively apply left and right torques to the input shaft 8 with hydraulic pressure to relatively rotate the input shaft 8 and the output shaft 7. . It functions as a reaction force actuator during normal steering, and when automatic steering control is required, such as during a driver's drowsy driving or side-viewing driving, the control valve 14 is driven by actively rotating the input shaft 8 and the output shaft 7 relative to each other. Then, it functions as a steering actuator that performs steering assist in the direction of torque application.

  FIG. 2 is a diagram showing a hydraulic pressure control unit that controls the hydraulic pressure supplied to the input shaft driving units 22 and 23.

  As shown in FIG. 2 in addition to FIG. 1, the hydraulic pressure control unit 26 includes spool valves 24 and 25 and a control unit 27 that controls the spool valves 24 and 25. The control unit 27 is connected to the battery 28 and drives the spool valves 24 and 25 based on a signal from an environment information detection unit 29 that detects the vehicle environment.

  The spool valves 24 and 25 are respectively provided with solenoids 24a and 25a and spools 24b and 25b, and the spools 24b and 25b are driven by driving the solenoids 24a and 25a based on commands from the control unit 27. The hydraulic pressure that is displaced and supplied to each of the input shaft drive units 22 and 23 is controlled.

  That is, the environment information detection unit 29 includes a vehicle speed sensor 29a, a white line recognition camera 29b on the road, and a driver's line-of-sight recognition camera 29c. The control unit 27 detects the detected vehicle speed and the relative positional relationship between the white line and the vehicle. The spool valves 24 and 25 are driven based on the driver's line of sight.

  The right rotation spool valve 24 is connected to the control valve 14 via the third oil passage 19 and is connected to the right rotation input shaft drive unit 22 via the sixth oil passage 30. On the other hand, the spool valve 25 for left rotation is connected to the control valve 14 via the first oil passage 17, and is connected to the input shaft drive unit 23 for left rotation via the seventh oil passage 31. .

  Each input shaft drive unit 22, 23 has a drive pin 32 and a plunger 33, and each drive pin 32 and each plunger 33 overlaps the torsion bar 9 with the input shaft 8 and the output shaft 7 in the radial direction. It is provided in the part. Then, the right rotation input shaft drive unit 22 and the left rotation input shaft drive unit 23 are provided in this order from the piston 4 side.

  FIG. 3 shows the left rotation input shaft driving unit 23, and is a cross-sectional view taken along the line AA in FIG. 4 is a front view showing the input shaft 8 alone, and FIG. 5 is a front view showing the drive pin 32 alone.

  As shown in FIG. 3, a plurality of drive pin insertion holes 8b are formed radially as input shaft side radial holes in the peripheral wall portion of the torsion bar housing hole 8a of the input shaft 8, and each drive pin insertion hole is formed. Drive pins 32 are press-fitted into 8b. Each drive pin 32 is arranged to face each other in the radial direction of the input shaft 8, and one end of each drive pin 32 protrudes radially outward from the input shaft 8. The other ends are respectively abutted against the torsion bar 9. As shown in FIG. 4, the shaft center of one drive pin insertion hole 8b among the drive pin insertion holes 8b of the input shaft drive unit 23 for left rotation is the fastening pin insertion hole 8c into which the fastening pin 16 is inserted. The drive pin insertion holes 8b are positioned on the basis of the fastening pin insertion holes 8c provided at the same position in the circumferential direction of the shaft center and the input shaft 8. Also, the shaft center of one drive pin insertion hole 8b among the drive pin insertion holes 8b of the input shaft drive unit 22 for right rotation is also in the same position in the circumferential direction of the input shaft 8 as the shaft center of the fastening pin insertion hole 8c. Is provided.

  In the input shaft accommodating portion 7b that surrounds the outer periphery of the region of the output shaft 7 in which the torsion bar 9 of the input shaft 8 is accommodated, a plunger accommodating hole 7c that is an output shaft side radial hole corresponds to each drive pin 32. A plurality of radial holes are formed, and each plunger 33 is accommodated in each plunger accommodating hole 7c so as to be movable forward and backward.

  A concave portion 33 a that is recessed in a so-called mortar shape is formed on the surface of the plunger 33 that faces the drive pin 32, and the bottom surface of the concave portion 33 a is an inclined surface that is inclined with respect to the advancing and retracting direction of the plunger 33.

  As shown in FIG. 5 in addition to FIG. 3, each drive pin 32 has a symmetrical shape in the longitudinal direction, and both end surfaces 32 a have a planar shape. Further, a chamfered circular arc surface 32b is formed at a corner portion formed between both end surfaces 32a and the outer peripheral surface of the drive pin 32.

  The BB line that is the axis of the drive pin 32 and the CC line that is the axis of the plunger 33 are offset by the angle θ in the circumferential direction of the input / output shafts 7 and 8 in the neutral state where the torsion bar 9 is not twisted. Thus, the arc surface 32b at one end of each drive pin 32 is in contact with the inclined surface on the left rotation direction side of the CC line among the bottom surfaces of the concave portions 33a of the plungers 33. That is, when each plunger 33 presses each drive pin 32 with the inclined surface contact, torque in the left rotation direction is applied to the input shaft 8.

  A left-rotation torque generation chamber 34 is formed on the back side of each plunger 33, and the left-rotation torque generation chamber 34 functions as a seventh oil passage 31 that functions as a hydraulic pressure supply unit, and a left-rotation spool valve 25. The plunger 33 and each drive pin are connected to the control valve 14 via the first oil passage 17 (see FIG. 1), and hydraulic oil is supplied from a pump (not shown) to the counterclockwise torque generation chamber 34. A torque in the counterclockwise direction is applied to the input shaft 8 via 32.

  The right rotation input shaft drive unit 22 is also configured in substantially the same manner as the left rotation input shaft drive unit 23 described above, but in the right rotation input shaft drive unit 22, the axis of each drive pin 32 is in the neutral position. This is different from the left rotation input shaft drive unit 23 in that the input shaft 8 is offset in the right rotation direction with respect to the axis of each plunger 33 in the state. That is, in the right rotation input shaft drive unit 22, the control valve 14 is connected to the right rotation torque generation chamber 35 via the third oil passage 19, the right rotation spool valve 24, and the sixth oil passage 30 that function as a hydraulic pressure supply unit. The pressure oil is supplied from above and each drive pin 32 is pressed by each plunger 33, whereby torque in the clockwise direction is applied to the input shaft 8.

  6 and 7 are views showing a method of assembling the drive pin 32 to the input shaft 8 in the method of assembling the power steering device. FIG. 6 is a sectional view in the axial direction of the power steering device, and FIG. It is DD sectional drawing.

  Here, when assembling each drive pin 32 to the input shaft 8, as shown in FIGS. 6 and 7, the input shaft 8 with the rotor 15 and the torsion bar 9 is inserted into the output shaft 7, and the torsion bar 9 and the output shaft are output. Before connecting the shaft 7, the input / output shafts 7 and 8 are relatively rotated from the neutral state, and the shaft centers of the drive pin insertion holes 8 b and the shaft centers of the plunger accommodation holes 7 c are connected to the input / output shafts 7 and 8. Match in the circumferential direction. In this state, of the drive pins 32, the two drive pins 32 facing each other in the radial direction of the input shaft 8 are simultaneously press-fitted into the drive pin insertion hole 8b.

  Specifically, first, the two drive pins 32 are each held by the guide member 36. The guide member 36 has a substantially cylindrical shape having the same diameter as or slightly smaller than each plunger receiving hole 7c.

  Then, one guide member 36 is held in the horizontal direction by the guide member holder 37 fixed on the vertical wall surface W, and the two drive pins 32 held by the guide members 36 are respectively connected to the input / output shafts 7 and 8. The guide members 36 are inserted into the inner diameter side of the output shaft 7 along the both plunger insertion holes 7c by inserting them from the plunger receiving holes 7c opposed to each other in the radial direction. Butt against the opening edge.

  In this state, the guide member 36 on the side opposite to the vertical wall surface W is pressed toward the vertical wall surface W, and the two drive pins 32 are simultaneously press-fitted into the drive pin accommodation hole 8b. That is, when the guide member 36 on the anti-vertical wall surface W side is pressed toward the vertical wall surface W, the drive pin 32 held by the guide member 36 on the anti-vertical wall surface W side is press-fitted into the drive pin accommodation hole 8b. At the same time, the drive pin 32 held by the guide member 36 on the vertical wall surface W side with the reaction force is also press-fitted into the drive pin accommodation hole 8b. After all the drive pins 32 are assembled to the input shaft 8, the torsion bar 9 and the output shaft 7 are coupled with the fastening pin 11.

  Therefore, by pressing the two drive pins 32 facing each other in the radial direction of the input shaft 8 out of the drive pins 32 into the drive pin insertion hole 8b at the same time, the force acting on the input shaft 8 during the assembly is canceled out. The As a result, each drive pin 32 can be assembled while the input shaft 8 is kept in a normal posture with respect to the output shaft 7, and damage to the bearing 12 that supports the input shaft 8 can be prevented.

  Each plunger receiving hole 7c and each driving pin insertion hole 8b are formed by drilling, and a pair of plunger receiving holes 7c or driving pin insertion holes 8b facing each other are formed by a single stroke of the drill. ing.

  That is, in the present embodiment, when a steering wheel (not shown) is steered in the right direction, the control valve 14 introduces the pump pressure into the right steering pressure chamber 2b and generates a differential pressure between the pressure chambers 2b and 2c. . As a result, the piston 4 moves downward in FIG. 1 and the sector shaft 5 rotates in the counterclockwise direction in FIG. 1 to perform a right steering assist.

  At that time, pressure oil from a pump (not shown) is introduced into the left rotation spool valve 25 through the first oil passage 17 and hydraulically controlled, and is introduced into the left rotation torque generating chamber 34 through the seventh oil passage 31. The As a result, the plunger 33 of the left rotation input shaft drive unit 23 is driven, and a reaction force torque in the left rotation direction is applied to the input shaft 8.

  Similarly, during left-hand steering assist, pressure oil from a pump (not shown) is introduced into the right rotation torque generating chamber 35 via the third oil passage 19 and the sixth oil passage 30, and the right rotation input shaft drive unit 22. The plunger 33 is driven to apply a reaction torque in the clockwise direction to the input shaft 8.

  That is, when the hydraulic pressure in the right steering pressure chamber 2b is high during normal steering, torque in the left rotation direction is applied to the input shaft 8 by the left rotation input shaft drive unit 23, and the hydraulic pressure in the left steering pressure chamber 2c is increased. Is high, the right rotation direction torque is applied to the input shaft 8 by the right rotation input shaft drive unit 22. At this time, the left rotation and right rotation spool valves 24 and 25 are driven in accordance with the vehicle speed detected by the vehicle speed sensor 29a, and torque corresponding to the environmental information is applied to the input shaft 8.

  Further, when the driver's drowsiness is detected by the line-of-sight recognition camera 29c, the left rotation and right rotation spool valves 24 and 25 are alternately driven, and the left rotation and right rotation drive units 22 and 23 are respectively driven. The hydraulic pressures in the torque generating chambers 34 and 35 are alternately raised and lowered.

  Therefore, the input shaft 8 vibrates by repeatedly rotating in both the left and right directions. As a result, a steering wheel (not shown) connected to the input shaft 8 vibrates in the left and right rotational directions, and issues a warning to the driver.

  Furthermore, when a lane departure state is detected by the white line recognition camera 29b. The left and right spool valves 24 and 25 are driven to rotate the input shaft 8 and the output shaft 7 relative to each other. Thereby, the opening degree of the control valve 14 is positively changed to perform steering assist, and the lane is returned.

  For example, when the vehicle deviates from the lane to the left side, the control valve 14 is turned to the right side by driving the spool valve 24 for right rotation and rotating the input shaft 8 relative to the output shaft 7 in the right rotation direction. Rotate to As a result, the hydraulic pressure in the right steering pressure chamber 2b is increased to generate an assist force in the right steering direction, and the vehicle turns rightward to avoid lane departure. When the vehicle is deviating to the right lane, the left turn spool valve 25 is driven to turn the vehicle counterclockwise.

  Therefore, according to the present embodiment, a plurality of drive pins 32 projecting radially from the input shaft 8 are assembled to the input shaft 8, and each of the drive pins 32 is pressed by each plunger 33 so that torque is applied to the input shaft 8. Therefore, the arm length from the contact point between the drive pin 32 and the plunger 33 to the rotation center of the input shaft 8 can be sufficiently secured, and a large torque is applied to the input shaft 8 so as to make a sleep. A prevention function, an automatic steering function, etc. can be added.

  In addition, since each drive pin 32 is abutted against the torsion bar 9, the protrusion amount of the drive pin 32 from the input shaft 8 is not influenced by the processing accuracy on the input shaft 8 side, and the merit of improving the accuracy is achieved. There is.

Here, technical ideas other than those described in the above-mentioned claims ascertained from the above-described embodiments will be described below.
(1) The power steering device according to claim 1, wherein each drive pin is press-fitted into each input shaft side radial hole.

Each drive pin is press-fitted into each input shaft side radial hole, thereby preventing the drive pin from coming out of the input shaft side radial hole.
(2) The power steering device according to claim 1, wherein each drive pin has a symmetrical shape in its longitudinal direction.

Each drive pin has no directionality in the longitudinal direction, and the assembly work can be performed without confirming the direction when each drive pin is assembled. Therefore, the workability is improved.
(3) The power steering device according to claim 1, wherein each drive pin is chamfered on the outer peripheral portion of the other end.

When each drive pin is inserted into each input shaft side radial hole, the outer periphery of the end portion on the insertion direction side of each drive pin becomes an inclined surface, so that workability is improved.
(4) The power steering device according to (3), wherein the other end surface of each drive pin that contacts the torsion bar is a flat surface.

When the other end surface of each drive pin is in line contact with the torsion bar (strictly surface contact), each drive pin is inserted into each input shaft side radial hole and abuts against the torsion bar. The pressure generated on the end face of the can be reduced.
(5) While each pressing pin of each plunger is in contact with each drive pin is inclined with respect to its forward / backward direction, one outer peripheral portion of each drive pin is inclined with respect to its longitudinal direction, 2. The power steering apparatus according to claim 1, wherein each piston and each drive pin are in contact with each other on an inclined surface so as to relatively rotate the input / output shaft.

Since each piston and each drive pin are in contact with each other on the inclined surface, the forward / backward movement of each piston can be smoothly converted into the rotational movement of the input shaft.
(6) The power steering device according to claim 1, wherein the drive pins are arranged so as to face each other in the radial direction.

Since each input shaft side radial hole faces each other in the radial direction of the input shaft, when drilling each input shaft side radial hole by drilling, a pair of inputs opposed in the radial direction of the input shaft The axial radial hole can be drilled with a single stroke.
(7) Of the control valves, the rotor having an oil passage switching groove on the outer peripheral surface and being extrapolated to the input shaft is fixed to the input shaft with a fastening pin,
The shaft center of the fastening pin insertion hole into which the fastening pin is inserted among the input shafts is formed at the same position in the circumferential direction of the input shaft as one of the input shaft side radial holes. The power steering apparatus according to claim 1, wherein the power steering apparatus is a power steering apparatus.

When drilling the input shaft radial direction hole, it is possible to perform processing based on the fastening pin insertion hole, and the workability is improved.
(8) In the neutral state where the output shaft side radial hole is formed through the input shaft housing portion and the torsion bar is not twisted, each input shaft side radial hole and each output shaft side radial direction The axial centers of the holes are offset in the circumferential direction of the input / output shaft,
In the state where the input / output shafts are relatively rotated from the neutral state, and the axial center positions of the input shaft side radial holes and the output shaft side radial holes are aligned with each other in the circumferential direction of the input / output shafts, The power steering device according to claim 1, wherein the power steering device is assembled to the input shaft from the outer peripheral side of the input shaft accommodating portion through each output shaft side radial hole.

By assembling each drive pin to the input shaft with the shaft center of the input shaft side radial hole and the output shaft side radial hole aligned, the output shaft side radial hole functions as a guide when the drive pin is assembled. This improves workability when assembling the drive pin.
(9) The power steering device according to (8), wherein the input shaft and the output shaft are connected after each drive pin is assembled to the input shaft.

It is not necessary to rotate the input shaft and the output shaft against the elastic force of the torsion bar, and the assembling workability of each drive pin is improved.
(10) The drive pins are arranged so as to face each other in the radial direction,
2. The power steering device according to claim 1, wherein two drive pins opposed to each other in the radial direction of the input shaft among the drive pins are simultaneously assembled to the input shaft.

When the drive pins are assembled, forces are applied to the input shaft in opposite directions from both sides in the radial direction, and the forces cancel each other.
(11) At the time of assembling each drive pin to the input shaft, the drive pin is held by the drive pin assembly guide member, and the guide member is output along with the drive pin along the peripheral wall of the output shaft side radial hole. 2. The power steering device according to claim 1, wherein each drive pin is assembled to the input shaft by moving toward the center of the shaft.

  The output shaft side radial hole functions as a guide when the drive pin is assembled, so that the drive pin assembly workability is improved.

The axial direction sectional view showing the power steering device as an embodiment of the present invention. The figure which shows the hydraulic control part which controls the hydraulic pressure supplied to each input shaft drive part. AA sectional drawing in FIG. The front view which shows an input shaft alone. The front view which shows a drive pin alone. It is a figure which shows the assembly method of a power steering apparatus, Comprising: The axial sectional view. DD sectional drawing in FIG.

Explanation of symbols

7: Output shaft 7b: Input shaft housing portion 7c: Plunger housing hole (output shaft side radial hole)
8 ... Input shaft 8a ... Torsion bar receiving hole 8b ... Drive pin insertion hole (input shaft side radial hole)
9 ... Torsion bar 14 ... Control valve 17 ... 1st oil passage (hydraulic supply part)
19 ... Third oil passage (hydraulic supply part)
24 ... Spool valve for right rotation (hydraulic supply part)
25 ... Spool valve for left rotation (hydraulic supply part)
30 ... Sixth oil passage (hydraulic supply part)
31 ... 7th oil passage (hydraulic supply part)
32 ... drive pin 33 ... plunger

Claims (1)

A torsion bar accommodating hole along the axial direction is formed on one end side, and has a plurality of input shaft side radial holes penetrating in the radial direction through the peripheral wall portion of the torsion bar accommodating hole, and the other end side is An input shaft coupled to the steering wheel;
A torsion bar having at least one end inserted in a torsion bar receiving hole of the input shaft;
An output shaft that is extrapolated to one end of the input shaft and has an input shaft housing portion that surrounds the outer peripheral side of the region of the input shaft where the torsion bar is inserted, and is connected to the input shaft via the torsion bar When,
A control valve that is formed between the input shaft and the output shaft and selectively supplies hydraulic oil supplied from the pump to both hydraulic chambers of the steering hydraulic power cylinder according to the relative rotation of the input / output shaft;
A plurality of drive pins inserted into each input shaft side radial hole, one end protruding radially outward from the input shaft, and the other end abutting the outer peripheral surface of the torsion bar;
Plungers that are accommodated in a plurality of output shaft side radial holes formed in the radial direction in the input shaft accommodating portion so as to be capable of moving forward and backward, and that relatively rotate the input and output shafts by pressing each drive pin,
A hydraulic pressure supply unit that supplies hydraulic pressure to each output shaft side radial hole according to the situation of at least one of the vehicle, the driver, and the road;
A power steering device comprising:

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