JP3406475B2 - Variable throttle valve device for power steering device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable throttle valve device used for controlling steering response in a power steering device.

[0002]

2. Description of the Related Art Conventionally, a variable throttle valve device has been used to control steering response in an electronically controlled power steering device (see, for example, Japanese Patent Application Laid-Open No. 7-98066). This variable throttle valve device, as shown in FIG.
A stepping motor 101 is arranged inside a hollow housing 104, an output shaft of the stepping motor 101 is connected to a drive shaft 102, and a screw portion 102 a of the drive shaft 102 is screwed onto a spool 103. The spool 103 is slidably held in an axial direction (vertical direction in the drawing) in a cylindrical inner surface-shaped hole 104 a formed in the housing 104, and an upper end portion thereof is attached against the spring 106. The space A formed by the recess 103a provided on the outer peripheral surface of the spool 103 communicates with a hole 103b formed through the spool 103 in a direction orthogonal to the axial direction. Also, the spool 103
The inner space B of the flow path 104 is formed in the housing 104.
It communicates with b.

A recess 104 formed in the housing 104
The space C formed by c communicates with the outlet port 104d formed in the housing 104. At the boundary between the space C and the space A described above, a throttle portion D that is opened and closed by the movement of the spool 103 is formed. The upper space and the lower space of the spool 103 are in communication with each other through a hole 103c formed by penetrating the spool 103 in the axial direction. The drive shaft 102 is inserted through a bush portion 107 a of a seal housing 107 that is fitted and inserted in the housing 104. An oil seal 1 for sealing is provided between the inner portion of the seal housing 107 and the drive shaft 102.
08 and a sleeve 109 for holding the same are provided. A cover 110 that closes the opening is attached to one end of the housing 104, and the stepping motor 101 is sandwiched between the cover 110 and the inner peripheral step 104e of the housing 104.

In the variable throttle valve device configured as described above, when the stepping motor 101 is driven according to the vehicle speed, the drive shaft 102 rotates, which causes the spool 103 to move in the axial direction. If the vehicle speed is low,
Stepping motor 1 in the direction in which spool 103 rises
01 is driven, thereby closing the diaphragm portion D.
As a result, the rate of increase of the hydraulic pressure that generates the steering assist force is increased based on the hydraulic control structure (not shown), and the steering response is improved. On the other hand, when the vehicle speed is high, the spool 103
The stepping motor 101 is driven in the descending direction, so that the diaphragm portion D is greatly opened. As a result, the increase rate of the hydraulic pressure that generates the steering assist force is reduced based on the hydraulic control mechanism, and the steering response is deteriorated.

[0005]

In the above-mentioned conventional variable throttle valve device, the handling of the lead wire 101a of the stepping motor 101 is a problem. That is, the lead wire 101a is connected to the stepping motor 1
01 is soldered to the terminal portion 101b provided on the outer periphery or the rear end portion of the housing 01, and the housing 104 is inserted from the terminal portion 101b (see FIG. 3) or the cover 1
10 is inserted (see FIG. 4) and pulled out of the housing 104. However, in any case, since the portion of the lead wire 101a pulled out from the housing 104 is in a free state without being fixed, for example, when the coupler is connected to the lead wire 101a, the lead wire 101a is pulled. The terminal portion 101b may be detached from the terminal portion 101b. Further, when the variable throttle valve device is mounted on a vehicle, there is a possibility that the lead wire 101a may largely swing due to vibration and may interfere with peripheral members such as an intermediate joint of the steering device, resulting in damage or disconnection. It was The present invention has been made in view of the above problems, and the lead wire of the motor is disengaged from the terminal portion of the motor due to an external force, or the lead wire swings, so that the lead wire is damaged or broken. It is an object of the present invention to provide a variable throttle valve device for a power steering device, which can prevent the occurrence of eclipse .

[0006]

To achieve the above object, a variable throttle valve device for a power steering device according to the present invention has a hollow housing, a motor arranged inside one end of the housing, and A drive shaft provided in the housing and connected to the output shaft of the motor so as to rotate integrally; and a spool held in the housing movably in the axial direction of the drive shaft and screwed with the drive shaft. A power steering device comprising: a throttle unit whose opening degree changes with axial movement of the spool due to rotation of the drive shaft.
In the stationary variable throttle valve device, the motor is replaced by the housing.
The rear end of the motor to attach to the open end of the
Comprising a plate-like bracket which is integrated in the part, the bra
The lead wire extending from the outer peripheral side of the motor is inserted into the
The through hole that is passed through and the projecting on the same plane of the bracket
And the lead wire and the through hole.
A seal member is interposed between the brackets,
When the lead wire is held by the seal member
In both cases, the lead wire drawn out from the through hole should be at a right angle.
When it is bent in the
It is tied up using a shape body, and the
Data is attached to the open end of the housing .

According to the variable throttle valve device for a power steering device having the above structure, the lead wire of the motor is inserted through the through hole formed in the bracket from the outer peripheral side of the motor,
It is held on the bracket by the seal member and fixed to the locking part protruding from the bracket, so that even if an external force acts on the lead wire, the external force will connect the lead wire to the motor. it can be prevented from being directly loaded. Further, by fixing the lead wire to the locking portion, it is possible to prevent the lead wire from swinging. In particular, since the lead wire inserted through the bracket is fixed to the locking portion while being bent in a substantially perpendicular direction, even when tension is applied to the lead wire,
It is possible to effectively prevent the tension from being applied to the connecting portion between the lead wire and the motor. Moreover, since the lead wire is fixed with the band-shaped body, the lead wire can be fixed easily.

In addition, the gap between the lead wire and the through hole is inserted.
Due to the existing seal member, water, sludge, dust, etc. from the gap
Are prevented from entering. In addition, the bracket
It is a flat plate, and the locking part is on the same plane as the bracket.
Since it is provided above, the bracket can be
It can be easily manufactured by punching.

The strip-shaped body is preferably an insulation lock strip, and in this case, the lead wire can be more easily fixed to the locking portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows the power of the present invention.
FIG. 1 is a sectional view showing an embodiment of a variable throttle valve device for a steering device . In the figure, a stepping motor 1 is arranged inside one end of a hollow housing 4. An output shaft 1a of the stepping motor 1 is connected to a drive shaft 2 and is formed on the tip side of the drive shaft 2. The male screw portion 2a is screwed into a female screw portion 3d formed on a part of the inner peripheral side of the spool 3. The spool 3 is held slidably in the axial direction (vertical direction in the figure) in a cylindrical inner surface-shaped hole 4 a formed inside the housing 4, and the upper end portion thereof is attached against the spring 6. The spring 6 is pressed from the upper end side by a plug 5 which is movable and adjustable in the axial direction. A concave portion 3a is provided on the outer peripheral surface of the spool 3, and a space (meaning an oil chamber space. The same applies hereinafter) A formed by the concave portion 3a is formed by penetrating the spool 3 in a direction orthogonal to the axial direction. It communicates with the formed hole 3b. Further, the inner space B of the spool 3 communicates with the flow path 4b formed in the housing 4.

A recess 4c is formed in the inner peripheral surface of the housing 4, and the space C formed by the recess 4c is
It communicates with an outlet port 4d formed in the housing 4. At the boundary between the space C and the space A described above, a throttle portion D that is opened and closed by the movement of the spool 3 is formed. The upper space E and the lower space F of the spool 3 are in communication with each other through a hole 3c formed by penetrating the spool 3 in the axial direction. When the spool 3 is raised and the throttle portion D is closed, the spaces A and C are separated from each other, and the flow passage 4b and the outlet port 4 are separated.
It does not communicate with d. When the spool 3 descends and the throttle portion D opens, the spaces A and C communicate with each other, and the flow path 4b becomes the outlet port 4
communicate with d. At this time, the amount of oil corresponding to the opening of the throttle portion D flows.

The drive shaft 2 is rotatably supported by a bearing (ball bearing) 10 mounted inside the seal housing 7 at one position on the base side thereof. An oil seal 8 for preventing oil leakage between the inner portion of the seal housing 7 and the outer peripheral surface of the drive shaft 2 and a sleeve for holding the oil seal 8 at a predetermined position on the tip side of the drive shaft 2 with respect to the bearing 10. 9 is provided. The seal housing 7 is a member having a columnar outer shape and a through hole in the central shaft portion, and by mounting an O ring 11 on the outer peripheral portion and tightly inserting the O ring 11 into the housing 4, the seal housing 7 and the drive shaft 2 are The space between the lower space F and the lower space F is sealed with the oil seal 8.

[0013] Oite to the variable throttle BenSo location, when the stepping motor 1 in accordance with the vehicle speed is driven, the drive shaft 2 is rotated, thereby the spool 3 is moved in the axial direction.
When the vehicle speed is low, the stepping motor 1 is driven in the direction in which the spool 3 moves upward, and the throttle portion D is closed thereby. As a result, based on the hydraulic control structure (not shown.) Provided adjacent to the variable throttle BenSo location, rate of increase in the hydraulic pressure for generating steering assist force is increased, the steering responsiveness is enhanced . On the other hand, when the vehicle speed is high, the stepping motor 1 moves in the direction in which the spool 3 descends.
Is driven, and the diaphragm section D is thereby opened. As a result,
Based on the hydraulic control mechanism, the rate of increase in the hydraulic pressure that generates the steering assist force is reduced, and the steering response is reduced.

A load in the axial direction is applied to the drive shaft 2 due to sliding resistance when the spool 3 is moved in the axial direction. The load is carried by the bearing 10 and the output shaft 1a of the stepping motor 1 is applied to the drive shaft 2. It does not reach. Therefore, the output shaft of the stepping motor 1 can be prevented from being locked, and the supporting rigidity of the drive shaft 2 can be improved. Further, since it is supported by the bearing 10, it has excellent durability.

In the variable throttle valve device having the above construction, the rear end portion of the stepping motor 1 is the housing 4
It is welded to a flat bracket 21 that also serves as a cover of the.
It is fixed to the housing 4 with bolts 25 via. The lead wire 1b of the stepping motor 1 is a terminal portion 1c provided on the outer periphery of the stepping motor 1.
Is soldered (see FIG. 1), extends from the terminal portion 1c toward the bracket 21, and is inserted through the through hole 21a of the bracket 21. The gap between the lead wires 1b and the through hole 21a, rubber, synthetic and seal member 2 2 made of an elastic material such as resin is interposed, held thereby, lead 1b is elastically to the bracket 21 At the same time, water, sludge, dust and the like are prevented from entering the inside of the housing 4 through the gap.

Lead wire 1b inserted through the bracket 21
Is fixed to a locking portion 23 projecting from the bracket 21 in a state of being bent in a substantially right-angled direction (rightward in FIG. 1). The lead wire 1b is secured by using the insulation lock band 24 as a band. For this reason, by winding the insulation lock band 24 around the locking portion 23 and the lead wire 1b, inserting the tip end side of the insulation lock band 24 into the locking hole of the base end portion, and tightening the lead wire 1,
b can be easily secured to the locking portion 23. Also,
The locking portion 23 is formed on the same plane as the bracket 21, so that the bracket 21 can be easily molded by punching by pressing.

As described above, in the variable throttle valve device, the lead wire 1b of the stepping motor 1 is held by the through hole 21a of the bracket 21 and is fixed to the engaging portion 23 projecting from the bracket 21. Because of the binding, even when an external force acts on the lead wire 1b, it is possible to prevent the external force from being directly applied to the connecting portion between the lead wire 1b and the terminal portion 1c of the stepping motor 1. Therefore, it is possible to prevent the lead wire 1b from being separated from the terminal portion 1c by an external force. In addition, the lead wire 1b
Since the lead wire 1b is fixed to the locking portion 23, it is possible to prevent the lead wire 1b from largely swinging due to vibration, and due to this swinging, the lead wire 1b surrounds the intermediate joint or the like of the steering device. By interfering with the member, it is possible to prevent damage, disconnection, and the like. In particular,
Since the lead wire 1b inserted through the bracket 21 is fixed to the locking portion 23 in a state of being bent in a substantially right angle direction, even when a tension acts on the lead wire 1b, the tension is applied to the lead wire 1b. It is possible to effectively prevent the connection portion with the terminal portion 1c from being loaded, and thereby more reliably prevent the lead wire 1b from being separated from the terminal portion 1c.

In the above embodiment, the stepping motor 1 and the bracket 21 are integrated by welding, but they may be integrated by screwing .

[0019]

As described above, according to the variable throttle valve device of the present invention, the lead wire connected to the outer peripheral side of the motor is
It is held by the bracket and fixed to the locking part while being bent in a substantially right-angled direction to prevent external force from being directly applied to the connecting portion between the lead wire and the motor. It is possible to effectively prevent the lead wire from coming off from the connecting portion. Further, by fixing the lead wire to the locking portion, it is possible to suppress the large swing of the lead wire. Therefore, due to the swing, the lead wire interferes with the peripheral member. It is possible to prevent damage, disconnection, etc.

In particular, when the lead wire is fastened to the locking portion by the insulation lock band, the lead wire can be easily fastened to the locking portion .

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a variable throttle valve device of the present invention, (a) is a partially cutaway front view showing a fixed state of a lead wire, and (b) is a view of (a). FIG.

FIG. 2 is a sectional view of a main part of a variable throttle valve device.

FIG. 3 is a sectional view of a main part showing a conventional example.

FIG. 4 is a sectional view of an essential part showing another conventional example.

[Explanation of symbols]

1 Stepping Motor 1a Output Shaft 1b Lead Wire 2 Drive Shaft 2a Male Screw Part 3 Spool 3d Female Screw Part 4 Housing 21 Bracket 21a Through Hole 22 Sealing Member 23 Locking Part 24 Insulation Lock Band D Throttling Part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-176283 (JP, A) Actually open 3-50390 (JP, U) Actually open 61-86990 (JP, U) Actually open 1- 107111 (JP, U) Actual development Flat 2-88280 (JP, U) Actual development Sho 62-122382 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 31/00-31 / 05 B62D 5/07 H05K 7/00

Claims (2)

(57) [Claims] 1. A hollow housing, a motor disposed inside one end of the housing, a drive shaft provided in the housing and integrally rotatably connected to an output shaft of the motor, A spool, which is held in the housing so as to be movable in the axial direction of the drive shaft, and is screwed into the drive shaft, and a throttle unit whose opening degree changes as the spool moves in the axial direction due to the rotation of the drive shaft. Power steering equipped
In a variable throttle valve device for a device, the motor is attached to an open end of the housing.
For this purpose, a flat plate-shaped bra integrated with the rear end of the motor
And a bracket extending from the outer peripheral side of the motor on the bracket.
Through hole through which the cable is inserted and the same plane of the bracket
And a locking member projecting upward, and a seal member is interposed between the lead wire and the through hole.
The lead wire is attached to the seal member on the bracket.
Better retained and pulled out from the through hole
With the lead wire bent in a substantially right angle direction.
The strap is secured to the locking portion of the cover using a strip, and the bra
The motor through the bracket the open end of the housing
Mounted on a power steer
Variable throttle valve device for steering device. 2. The variable throttle valve device for a power steering device according to claim 1, wherein the band-shaped body is an insulation lock band.