JPH0567382B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a grinding device for multifaceted grinding of a peripheral wall portion of a pinion holder provided in a gearbox for power steering.

(Conventional technology) Conventionally, as a power steering device,
According to Japanese Patent No. 167560, as shown in Fig. 9, a pinion holder A is pivotally supported in a gear box a, and a pinion shaft b connected to the steering shaft is eccentrically mounted to the holder A with respect to the rotational axis ₀₁ of the holder A. The holder A is supported so as to be rotatable about the axis ₀₂ , and is rotated by the steering reaction force from the rack d which engages the pinion c on the pinion shaft b.
It is known that the cylinder is rotated around the axis ₀₁ , and the switching valve e for the power cylinder is operated by this rotation.

Here, as shown in FIG. 8, the pinion holder A includes hubs B and C at both ends formed by eccentrically forming a shaft support hole for the pinion shaft b, and two peripheral wall portions connecting the hubs B and C. D, and a first hub B at one end
There is an operating pin _B1 of the switching valve d on the end face of the switch valve d, and a chamfered part _C1 for interference prevention on the outer peripheral surface of the second hub C on the other end.
As shown in FIG _. 10, a stopper surface D1 is formed on the side edge of each circumferential wall portion D to abut against a seating surface f formed on the gearbox a, thereby preventing rotation of the pinion holder A. We are trying to control the range.

Conventionally, an operator holds the pinion holder by hand and sequentially grinds the side edges of each peripheral wall portion D with a rotating grindstone to form the stopper surface _D1 .

(Problems to be Solved by the Invention) In order to improve the machining accuracy and work efficiency of the stopper surface, it is desirable to automate the grinding work. In addition, it is necessary to perform phase matching and accurate index rotation, and the problem is how to do this.

An object of the present invention is to solve this problem and provide a grinding device that can automatically grind a pinion holder.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes hubs at both ends that are pivotally supported within a gear box for power steering, and each hub has a shaft that supports a pinion shaft connected to a steering shaft. A pinion holder for power steering, which has a hole eccentrically formed, an actuation pin of a switching valve for a power cylinder on the end face of a first hub at one end, and a chamfered part on the outer peripheral surface of a second hub at the other end. In an apparatus for multifaceted grinding of a peripheral wall part, a pair of housings are provided on a base on both sides of a rotary grindstone arrangement part, a spindle which can be indexed and rotated is pivotally supported in one first housing, and the spindle is A reference block having a seat for receiving the end surface of the first hub and a positioning groove into which an operating pin can be inserted is attached to the tip of the first hub, and a collet chuck for gripping the outer peripheral surface of the first hub is attached to the other second housing. , the axis of the spindle is
A tailstock shaft that can move forward and backward in the X-axis direction is inserted as a shaft, and a work holder into which a second hub can be inserted is rotatably supported at the tip of the tailstock shaft, and the work holder A clamp member is provided inside the clamp member, which has a contact portion that contacts the end surface of the second hub, and a seating portion that receives the contact reaction force of the contact portion and seats on the chamfered portion of the second hub.

(Function) The first hub of the pinion holder is inserted and set into the collet chuck while aligning the phase so that the operating pin is inserted into the positioning groove of the reference block, and then the tailstock shaft is advanced toward the first housing. According to this, the second hub of the pinion holder is inserted into the work holder, and the contact portion of the clamp member is in the second hub.
The seating part comes into contact with the chamfered part of the second hub by contacting the end surface of the hub, and the second hub is clamped between the inner peripheral surface of the work holder and the seating part, The pinion holder is pressed in the X-axis direction so that the end surface of the first hub comes into close contact with the seat of the reference block, and in this state the collector chuck is closed to grip the first hub.

In this way, the pinion holder is accurately centered and held between the collet chuck and the work holder with phase alignment by the positioning groove and axial positioning by the catch, and when the spindle is indexed and rotated, the collet chuck can be rotated. The pinion holder is accurately indexed and rotated around the X-axis together with the work holder through the pinion holder, and each predetermined grinding surface on the peripheral wall of the pinion holder is sequentially opposed to the rotating grindstone to perform accurate grinding. can.

(Example) Referring to FIG. 1, 1 is a base, 2 is a rotating grindstone, and a pair of first and second housings are placed on the base 1 on both sides of the area where the rotating grindstone 2 is arranged. 3 and 4 were fixed.

The first housing 3 includes an index motor 5.
A spindle 8 which is indexed and rotated is pivotally supported via a gear 6 and a harmonic drive type reduction gear 7, and a reference block 9 and a collect chat 10 are attached to the tip of the spindle 8 as shown in FIG. Installed.

As shown in FIGS. 3 and 4, the reference block 9 is provided with three protruding seats 9a for receiving the end face of the first hub B of the pinion holder A, and has a first hub B at one location around the seats 9a. Actuation pin implanted on the end face of
B ₁ is formed with a positioning groove 9b into which the leaf spring 9 can be inserted, and in the illustrated one, the plate spring 9 has a substantially U-shaped bent portion 9c ₁ facing the side surface of a predetermined seat 9a.
c is attached to the reference block 9, and the positioning groove 9b is formed between the catch seat 9a and the leaf spring 9c,
In order to be able to insert and hold the actuating pin _B1 into the groove 9b without play, and to facilitate the insertion of the actuating pin _B1 into the groove 9b, the tip of the side surface of the seat 9a is formed into an inclined surface _9a1. was formed. In the figure, 9d is the reference block 9.
The relief groove for the actuating pin _B1 formed on the circumferential surface of the figure is shown.

The collet chuck 10 is composed of a collet 10a that grips the first hub B, an operating sleeve 10b on the outer periphery of the collet 10a, and an outer sleeve 10c on the outer periphery of the sleeve 10b.
b is prevented from rotating with respect to the spindle 8 by a guide pin 10b ₁ and biased toward the front opening side by a spring 10b ₂ , and further a cylinder 10c ₁ consisting of a stepped hole is formed on the inner periphery of the outer sleeve 10c, A piston 10b ₃ that fits into the cylinder 10c ₁ is integrally formed on the outer periphery of the tail end of the operation sleeve 10b, and air is supplied to the air chamber on the front side of the cylinder 10c ₁ .
The operating sleeve 10b was pushed rearward against the spring _10b2 so that the collector 10a was closed.

In the figure, 11 is an extrusion rod inserted into the spindle 8 so that it can be moved forward and backward by a cylinder 11a inside the spindle, 12 is a rotary joint for air piping to the cylinders 10c ₁ and 11a, and 13 is a device that detects the rotational phase of the spindle 8. Shows proximity switch.

As shown in FIG. 5, a cylindrical tailstock shaft 14 that can move forward and backward in the X-axis direction, which is the axis of the spindle 8, is inserted into the second housing 4, and at the tip of the tailstock shaft 14, Second hub C of pinion holder A
A work holder 15 having a recessed hole 15a into which a second hub C can be inserted is rotatably supported around the A clamp member 16 having a seating portion 16b that can be seated on a chamfered portion _C1 on the outer periphery of the hub C is provided.

To explain this in more detail, a cylinder 14a is formed in the tail end side half of the tailstock shaft 14, and the cylinder 14a is fitted onto the piston rod 17 fixedly installed in the second housing 4. The tailstock shaft 14 is moved forward and backward in the X-axis direction by supplying air to the rear chamber, and a rotating shaft 18 concentric with the X-axis is supported on the inner periphery of the tip half of the shaft 14. A work holder 15 is attached to the tip of the rotating shaft 18, and a spring 19a inside the rotating shaft 18 causes the work holder 15 to be
A cushion rod 19 that is biased forward in the axial direction is inserted, and the distal end of the rod 19 has an abutment portion facing the end surface of the second hub B at one end, as clearly shown in FIGS. 5 and 6. 16a, and a wide seating portion 16b facing the chamfered portion _B1 of the second hub B at the other end.

The clamp member 16 is prevented from rotating relative to the work holder 15 by a pin 20 passing through an elongated hole 19b formed in the cushion rod 19, and the tail end of the rotating shaft 18 is attached to the tip of the piston rod 17. As shown in FIG.
When the tailstock shaft 14 is retracted, the cam portion 18a is engaged with the guide pin 21, so that the work holder 15 can be aligned and held in a predetermined phase.

Next, the operation of this embodiment will be explained.

First, the first hub B of the pinion holder A is inserted into the collet chuck 10 while aligning the phase so that the operating pin _B1 is inserted into the positioning groove 9b, and then the tailstock shaft 14 is advanced.

During this forward movement, the work holder 15 is attached to the guide pin 2
The second pinion holder A moves forward together with the tailstock shaft 14 while maintaining the predetermined phase held by the
The hub C is inserted into the recessed hole 15a of the work holder 15, and the seating portion 16b of the clamp member 16 is placed in the second position.
A contact portion 16a of the clamp member 16 is placed opposite to the chamfered portion _C1 of the hub C, and then on the end surface of the second hub C.
contacts, and this contact reaction force causes the clamp member 1 to
6 swings counterclockwise in FIG.
b is in pressure contact with the chamfered portion _C1 , and the second hub C is in contact with the concave hole 1.
5a, and the pinion holder A is pushed toward the first housing 3 so that the end face of the first hub B comes into close contact with the seat 9a of the reference block 9. In this state, the collector chuck 10 is closed and the first hub B, then index and rotate the spindle 8. According to this, the pinion holder A is indexed and rotated together with the work holder 15 via the collect chuck 10, and the side edge of one peripheral wall portion D of the pinion holder A is at a predetermined indexed position facing the rotating grindstone 2. The rotation of the spindle 8 is stopped, and the part of the side edge that will become the stopper surface D ₁ is ground by the rotary grindstone 2,
Next, the spindle 8 is indexed and rotated so that the side edge of the other peripheral wall portion D faces the rotary grindstone 2, and the side edge is ground.

After the grinding is completed, the tailstock shaft 14 is moved backward to remove the work holder 15 from the second hub C, and then the collect chuck 10 is opened to advance the extrusion rod 11 and the first hub B is pushed out from the collect chuck 10. .

The clamp member 16 may be directly supported on the work holder 15, but if it is supported on the cushion rod 19 as in the above embodiment, the tolerance of the axial dimension of the pinion holder A can be adjusted to the cushion rod 1.
It is advantageous because it can be absorbed by the movement of 9.

Further, in the above embodiment, the clamp member 16 is formed in the shape of a bell crank, but a wedge piece is provided which is linked to the lever having the contact portion 16a, and the seating portion 16b is pressed against the chamfered portion _C1 via the wedge piece. It is also possible to configure it as follows.

(Effects of the Invention) As described above, according to the present invention, the pinion holder can be positioned in a predetermined phase and in the axial direction to be accurately centered and held, and the multifaceted grinding of the peripheral wall of the pinion holder can be automatically performed with high precision. It has the effect of significantly improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a side view of one example of the device of the present invention, FIG. 2 is a longitudinal side view of the first housing, FIG. 3 is a front view of the reference block seen from the - line in FIG. 2, and FIG. Developed sectional view taken along the - line in Figure 3, No. 5
The figures are longitudinal sectional views of the second housing, Figures 6 and 7.
The figures are respectively a cross-sectional view taken along the - line and - line of Fig. 5, Fig. 8 is an oblique view of the pinion holder, Fig. 9 is a sectional view of the steering gear box incorporating the pinion holder, and Fig. 10 is a sectional view of the steering gear box shown in Fig. 9. FIG. A... Pinion holder, B... First hub, B ₁
... Operating pin, C ... Second hub, C ₁ ... Chamfer, 1 ... Base, 2 ... Rotary grindstone, 3 ... First housing, 4 ... Second housing, 8 ... Spindle, 9...Reference block, 9a...Catch, 9b
...Positioning groove, 10 ...Collection chuck, 1
4... Tailstock shaft, 15... Work holder, 16...
...Clamp member, 16a... Contact portion, 16b...
Seating area.

Claims (1)

[Claims] 1 Equipped with hubs at both ends that are pivotally supported within a gear box for power steering, each hub has an eccentric shaft support hole for a pinion shaft connected to the steering shaft, and a shaft support hole for a pinion shaft connected to the steering shaft is formed eccentrically on the end surface of the first hub at one end. In an apparatus for multi-faceted grinding of the circumferential wall of a pinion holder for power steering, which includes an actuation pin of a switching valve and a chamfered portion on the outer circumferential surface of a second hub at the other end, a rotary grindstone is placed on a base on both sides. A pair of housings are provided, and a spindle that can be indexed and rotated is pivotally supported in one of the first housings, and a catch and an operating pin can be inserted into the tip of the spindle to receive the end surface of the first hub. A reference block provided with a positioning groove and a collet chuck that grips the outer peripheral surface of the first hub are attached, and a center that can move forward and backward in the X-axis direction with the axis of the spindle as the X-axis is attached to the other second housing. A push shaft is inserted, and a work holder into which a second hub can be inserted is supported rotatably around the X axis at the tip of the tail stock shaft, and the work holder is brought into contact with the end surface of the second hub. A grinding device for a pinion holder for power steering, comprising a clamp member having a contact portion and a seating portion that receives a contact reaction force of the contact portion and seats on a chamfered portion of a second hub.