JP3285051B2 - Camshaft manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a camshaft used for an automobile engine or the like, and more particularly to an improvement in an apparatus for sequentially press-fitting a plurality of cams into one shaft. is there.

[0002]

2. Description of the Related Art An assembling camshaft manufacturing apparatus for sequentially press-fitting a plurality of cams into one camshaft is disclosed in Japanese Patent Laid-Open No. 3-168.
No. 305. The apparatus includes a chuck for gripping one end of a shaft, a clamp that detachably holds a cam piece and slides and rotates in the axial direction of the shaft, and a punch that forms a protrusion on the outer peripheral surface of the shaft.

In this device, first, a punch is formed at a first cam piece setting position on an outer peripheral surface of a shaft to form a first projection of an annular ridge on a shaft, and then the first cam piece is mounted on a clamp, and the clamp is mounted on the shaft. Is rotated so that the first cam piece is at a predetermined angular position with respect to the shaft, and the clamp is further advanced axially toward the shaft to press-fit the first cam piece from the open end side of the shaft into the first cam piece set position. Then, the first cam piece of the clamp is released, and the clamp is retracted in the axial direction to escape from the open end of the shaft to finish press-fitting the first cam piece.

Next, a second projection is formed at the second cam piece setting position on the outer peripheral surface of the shaft with a punch, and the second projection is formed on the clamp.
The cam piece is mounted, and the second cam piece is pressed into the shaft at the second cam piece setting position, similarly to the first cam piece. In this way, a predetermined number of cam pieces are pressed into one shaft.

[0005]

The above-mentioned device is a system in which the shaft is supported only at one end and the cam piece is fitted into the shaft from the opposite open end. However, the open end of the shaft is eccentric in order to support the shaft in a cantilever manner. If the tolerance between the cam piece shaft hole and the shaft outer diameter is small, the cam piece may not be able to be pressed into the shaft.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem. It is an object of the present invention to reliably press-fit a cam piece into a shaft even if the tolerance between the cam piece shaft hole and the shaft outer diameter is small. It is to provide a device.

[0007]

In order to achieve the above-mentioned object, the present invention employs a chuck means capable of detachably gripping one end of a shaft, rotating, and moving in the axial direction. A center means capable of automatically centering and pressing and supporting the other end of the shaft, and being movable in the axial direction of the shaft; and being capable of moving in a plane intersecting the shaft and individually detachably holding a plurality of cam pieces from the outside. And a processing means for forming an annular ridge on the outer peripheral surface of the shaft.

[0008]

In the device of the present invention, the operation of press-fitting the cam into the shaft is performed as follows. First, a plurality of cam pieces attached to one shaft are gripped by the clamp means. Since the clamp means grips the cam piece from the outside, it does not cover the shaft hole of the cam piece and its vicinity. Next, one end of the shaft is gripped by the chuck means. Then, the first cam piece that moves and grips the clamping means is arranged coaxially with the shaft. Next, the center means is moved to self-center and support the other end of the shaft.
At this time, the center penetrates the shaft hole of the first cam piece. The first cam piece setting position of the shaft is arranged at the processing position of the processing means. At this time, the chuck means moves in the axial direction together with the center means. Therefore, an annular raised projection such as a knurl is formed at the first cam piece set position on the outer peripheral surface of the shaft by the processing means. Then, after rotating the chuck means to adjust the shaft to the angular position of the first cam piece, the chuck means and the center means are moved in the axial direction to press-fit the first cam piece into the first cam piece setting position of the shaft. Then, the gripping of the clamp means of the first cam piece is released, and then the chuck means, the center means, and the clamp means are returned to their original positions.

Next, similarly to the first cam piece, the second cam piece is press-fitted into the second cam piece setting position of the shaft. In this way, all the cam pieces which are first gripped by the clamping means are pressed into the respective cam piece setting positions of the shaft.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be described based on an embodiment shown in the drawings. As shown in FIGS. 1 and 2, a main stand 11 is provided on a base 10 and substands 12 and 13 are provided on both sides thereof, and a guide 14 is passed between the main stand 11 and the substand 12. The chuck holder 15 is slidably mounted on the guide by hydraulic pressure in the guide extension direction, and the guide holder is slid by hydraulic pressure.

A chuck 16 is attached to the center of the guide holder 15 so as to be rotatably driven by hydraulic pressure, a guide 17 is passed between the main stand 11 and the sub stand 13, and the center holder 18 is slid in the guide longitudinal direction by hydraulic pressure. Attach drivably. The center 19 is fixed to the center holder 18. The guide 14 and the guide 17 are parallel, and the chuck 16 and the center 19 are coaxial.
As the center holder 18 advances and retreats, the center 19 enters and exits the center hole having a diameter larger than that of the cam piece shaft hole of the main stand 11.

A horizontal table 20 extending horizontally is attached to the main stand 11. The horizontal table 20 is also provided with a center hole through which the center 19 enters and exits. Main stand 1
A vertical table 23 extending in the radial direction perpendicular to the horizontal table 20 is attached to 1. A clamper 21 is mounted on the horizontal table 20 via a hydraulic pressure so as to be slidable in the longitudinal direction of the horizontal table. The clamper 21 has a plurality of cam piece clamps 22 arranged in a horizontal direction, and each of the cam piece clamps 22 has a gripper for gripping the cam piece from outside. The gripping claw is opened and closed by hydraulic pressure, but does not touch the shaft hole of the cam piece. Each cam piece clamp 2
2 and the clamper 21 for attaching them have a hole or groove larger in diameter than the shaft hole of the cam piece. Table 23
A knurling tool 24 having a hydraulic cylinder is mounted at a position closer to the chuck side than the cam piece clamp 22.

Next, the operation of the apparatus of the present invention will be described. Each hydraulic mechanism is operated by a control unit (not shown) equipped with a computer. First, the cam piece 2 is put into each cam piece clamp of the clamper 21. For example, the first cam piece is put into the first cam piece clamp, the second cam piece is put into the second cam piece clamp, the third cam piece is put into the third cam piece clamp, and the angular position of each cam piece with respect to the shaft is input to the control unit.

Next, as shown in FIG. 3A, one end of the shaft 1 is held by the chuck 16. At this time, if the shaft is heavy, it is transported using a loading cylinder (not shown). Next, as shown in FIG. 3B, the cam piece clamp 22 on which the first cam piece 2 is mounted is moved to a position coaxial with the chuck 16.

Next, as shown in FIG. 3 (c), the center 19 is moved to the shaft side indicated by the thick arrow to engage the other end of the shaft 1 through the shaft hole of the first cam piece 2, and the shaft 1 is chucked. The center 16 and the center 19 automatically press and support from both sides. Next, as shown in FIG. 3D, both the chuck 16 and the center 19 are moved in the direction of the thick arrow to adjust the first cam piece setting position 3 on the outer peripheral surface of the shaft to the position of the knurling tool 24. Therefore,
As shown by the thin arrow, the knurled tool 24 is
A knurl is formed at the first cam piece setting position 3 against the outer peripheral surface of the first cam piece.

Next, as shown by a thick arrow in FIG. 3E, the chuck 16 is rotated to set the angular position of the shaft 1 to the angular position of the first cam piece 2, and then the chuck 16 and the center 19 are moved together. Then, the shaft is inserted into the shaft hole of the first cam piece 2, and the first cam piece 2 is pressed into the first cam piece position 3. Next, as shown by a thin arrow in FIG. 3F, the gripping claws of the first cam piece clamp 22 are opened, and the first cam piece 2 is released. Then, as shown by the thick arrow, the chuck 16 and the center 19 are returned to their original positions. At this time, the first cam piece 2 is fixed at the first cam piece setting position 3 of the shaft 1.

When the clamper 21 is moved again to dispose the second cam piece clamp coaxially with the chuck 16 and the same operation is sequentially repeated, the second cam piece is moved to the second cam piece setting position of the shaft, and the third cam piece is moved to the third cam piece setting position. The cam pieces are each press-fitted to the third cam piece setting position. After a predetermined number of cam pieces are pressed into the shaft, the shaft is removed from the chuck. It is easy to automate all operations other than attaching and detaching this shaft to the chuck,
Further, when an autoloader for the shaft and the cam piece is provided, the press-fitting operation of the cam piece to the shaft can be continuously automated.

[0018]

As described above, the apparatus of the present invention is different from the conventional apparatus in which the cam piece is press-fitted while the shaft is cantilevered, and is a system in which both ends of the shaft are supported and the cam piece is press-fitted. Even if the tolerance between the outer diameter of the shaft hole and the outer diameter of the shaft is small, there is an excellent effect that the cam piece can be reliably press-fitted into the shaft.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of an apparatus according to an embodiment of the present invention;

FIG. 2 is a plan view showing a main part of the apparatus of FIG. 1,

FIG. 3 is a schematic diagram showing a press-fitting procedure of the apparatus of FIG. 1,

[Explanation of symbols]

1: Shaft, 2: Cam piece, 3: Cam piece set position, 10: Base, 11: Main stand, 12, 1
3: sub stand, 14: guide, 15: chuck holder, 17: guide, 18: center holder, 19: center, 20: horizontal table, 21: cam piece clamp, 22: clamper, 23: vertical table, 24: knurl tool

Continuation of the front page (56) References JP-A-7-237049 (JP, A) JP-A-4-201135 (JP, A) JP-A-47-38662 (JP, A) JP-A-3-168305 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23P 19/00-21/00 B21D 17/02 F01L 1/04

Claims (1)

(57) [Claims] 1. A chuck means (15, 16) for gripping one end of a shaft (1) so as to be detachable and moving in the axial direction of the shaft, and rotating the shaft; Center means (18, 19) for centering and supporting the other end and a plurality of cam pieces (2) are removably gripped by moving along a plane intersecting in the axial direction of the shaft, with their shaft holes exposed. Clamping means (20,
21, 22) and processing means (23, 24) for forming an annular ridge on the outer peripheral surface of the shaft.
Camshaft manufacturing equipment provided in 12, 13, 14, 17)
The main stand on the base (10) of the machine frame.
(11) and sub-stands (12, 13) on both sides
Erect the main stand (11) and sub stand (1
Pass the guide (14) during 2) and forward to the guide (14)
Guide extension of chuck holder (15) of chuck means
Slidably mounted by hydraulic pressure in the direction, chuck
The chuck (16) is hydraulically attached to the center of the holder (15).
With the main stand (11)
Pass another guide (17) between sub-stands (13)
And another guide (17) with the center of the center means
Drives the holder (18) in the guide longitudinal direction by hydraulic pressure
Mounting possible, center on center holder (18)
(19) is fixed, and the guide (14) and another guide (1) are fixed.
7) is parallel, chuck (16) and center (19)
Coaxial, and the center holder (18)
(19) is the cam piece of the main stand (11)
Enter and exit the central hole that is larger in diameter than the shaft hole, and
1) a horizontal table extending horizontally of the clamping means
Attach (20) and center on horizontal table (20)
-A central hole through which (19) enters and exits, and the main stand
(11) in the radial direction orthogonal to the horizontal table (20)
Attach the vertical table (23) of the processing means to be extended
And the hydraulic pressure on the clamper (21) on the horizontal table (20)
Can be slidably driven in the longitudinal direction of the horizontal table via
The clamper (21) comprises a plurality of horizontal campipes.
Each cam piece clamp
(22) and the clamper (21) for attaching them
Has a hole or groove larger than the shaft hole of the cam piece,
Knurling tool with hydraulic cylinder in bull (23)
Camshaft manufacturing apparatus comprising a feature that was attach the (24).