JPS6294232A - Device for installing cam shaft - Google Patents

Abstract

PURPOSE:To enable automatic assembling without making cam shaft interfere with a cam supporting hole part by jetting out oil in said cam supporting hole by means of an oil jetting device when a guide rod is inserted in said hole at the time of inserting a cam shaft. CONSTITUTION:When installing a camshaft, as the end of a guide rod 17 arrives at the journal part 3a position of a cylinder head, a limit switch 32 is collapsed due to a cam on the guide head 14 side, causing hydraulic pressure from a pump 31 to be fed into a feed pipe 29, to jet out oil to each of the journal parts 3a. Then, as the head 14 is retracted and the rod 17 comes in position, the head 14 is stopped and, by placing a cam shaft 7 on a cradle 8 and as a starting button is pressed, a rear supporting table 10 is advanced, and tailstock center 13, 23 are fitted into the center holes on the front and rear ends of the shaft 7 and a knock pin 7a is fitted into an engaging hole 24. Then, by detecting that the supporting table 10 is advanced, the head 14 is retracted, and that an inner cylinder member 21 is telescoped into an outer cylinder member 20, the cradle 8 is lowered and the supporting table 10 and the head 14 are advanced. Accordingly, the shaft 7 is inserted into a supporting hole 3b while oil is jetted out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camshaft mounting device.

[Conventional technology]

Normally, a valve train for an engine employs a method in which a camshaft is attached to a cylinder head, the camshaft is rotated by the engine output, and the intake and exhaust valves are opened and closed by the cam.

When attaching this camshaft to a cylinder head, conventionally, due to the shape of the camshaft where the cam diameter is larger than the journal diameter, a cam cap is bolted to the cylinder head and the camshaft is attached using the cam cap. However, in this case, the installation work was very complicated.

[Problem that the invention seeks to solve]

Recently, a method has been proposed for engines in which the cam diameter of the camshaft is made slightly smaller than the journal diameter, a cam support hole is provided in the cylinder head, and the camshaft is installed by inserting it into the cam support hole. and
This method has the advantage that bolt tightening work for the cam camp is not required, and the installation work can be simplified.

However, even with the above method, if the installation work is done manually, there is a problem that the camshaft and the cam support hole interfere with each other when inserting the camshaft, causing scratches and chips. Considering the trend toward automation, there is still room for improvement in terms of installation workability.

In view of the above, the present invention has been developed so that the camshaft and the cam support hole do not interfere with each other when the camshaft is inserted.
It is an object of the present invention to provide a camshaft mounting device that can automatically assemble a camshaft.

[Means for solving problems]

Therefore, the camshaft mounting device according to the present invention includes a cylinder head support base, a guide head having a guide rod that rotates and moves the same back and forth, and a rear support base that presses and holds the camshaft together with the guide rod and moves it forward. and,
An oil ejecting device is provided for ejecting oil into the cam support hole when the guide port/throat is inserted into the cam support hole.

[Effect]

In this invention, when the cylinder head is placed on the cylinder head support stand and the guide head retreats, the guide rod is inserted through the cam support hole of the cylinder head, and between the inserted guide rod and the rear support stand. When the camshaft is clamped, the guide rod and the rear support move forward, and the camshaft is inserted into the cam support hole. At this time, when the guide rod is inserted into the cam support hole, the cam support is removed by the oil jet device. Oil is squirted into the hole, thereby automatically assembling the camshaft into the cam support hole.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a camshaft mounting device according to an embodiment of the present invention. In the figure, 1 is a floor surface, a table 2 is fixed on the cough floor surface 1, and a cylinder head on which a cylinder head 3 having a cam support hole 3b is placed is placed approximately at the center of the table 2. A support stand 4 is provided, and the support stand 4 is provided with a positioning member 5 for positioning the throat 3 to the cylinder, and a press holding member 6 for holding the cylinder head 3 under pressure is rotatably provided. ing.

Further, on the rear side of the cylinder head support stand 4 on the table 2, a cam holder 8 for mounting the camshaft 7 is disposed, and the cam holder 8 has a vertically moving cylinder that moves the cam shaft 7 up and down. 9 is provided. Furthermore, this cam holder is on stand 8
An fA part support stand 10 is arranged on the rear side, and the rear support stand 10 is provided so as to be movable back and forth by a guide 1).The rear support stand 10 is also provided with a back and forth movement cylinder 12 for moving it back and forth. A tailstock center 13 that presses the rear part of the camshaft 7 is provided.

On the other hand, a guide head 14 is disposed on the front side of the gutter support base 4 for the cylinder on the table 2.
is provided so as to be movable back and forth by a guide 15, and the guide head 14 is provided with a back and forth moving cylinder 16 for moving it back and forth.

Further, a guide rod 17 is provided on the guide head 14 so as to be freely rotatable toward the rear side, and the guide loft 17 is connected to a drive motor 19 via a belt.

In this guide rod 17, an inner cylinder member 21 is slidably provided inside an outer cylinder member 20, and the inner cylinder member 21 is biased toward the rear side by a spring member 22.
The removal is prevented by the stepped portion 20a. A tailstock center 23 is formed at one end of the inner cylindrical member 21, and an engagement hole 24 into which the knock pin 7a of the camshaft 7 engages is formed. In addition, a predetermined space is provided inside the outer cylinder member 20 from the other end of the inner cylinder member 21, and the inner cylinder member
A pipe 25 is fixed in communication with 1, and the pipe 25 (
I! ! The end side projects from the outer cylinder member 20.

And the pipe 25. Outer cylinder member 20. An oil supply passage 26 is formed in the inner cylinder member 21 and the tailstock center 23, and an annular recess 23a is formed in a part of the tailstock center 23 in communication with the oil supply passage 26. Three oil supply passages 27 are formed so as to communicate with the annular recess 23a, and each passage 27 opens on the outer periphery of the end of the cylindrical member 20. On the other hand, an oil supply section 28 is rotatably attached to the protrusion of the vibrator 25, one end of an oil supply pipe 29 is connected to the supply section 28, and a control valve is connected to the other end of the oil supply pipe 29. 30 and pump 31
The control valve 30 is provided with a limit switch 32 and a timer 33 for controlling the opening and closing of the control valve 30. The limit switch 32 is fixed to the table 2, and the guide rod 14 has a tip end of a guide rod 17 connected to a cylinder. head 3
A plurality of cams 34 are fixed, which actuate limit switches 32 when the cams 34 come to the positions of the respective journal parts 3a.
As described above, the oil ejecting device 35 that ejects oil into the support hole 3b when the cam support hole 3b is inserted is configured.

Next, the operation will be explained.

When installing the camshaft 7 on the cylinder head 3, first open the oil supply cover (not shown), rotate the press holding member 6 upwards, and place the cylinder head 3 on the cylinder head support stand 4 in this state. After positioning this with the positioning member 5, the press holding member 6 is rotated downward to press and hold the cylinder head 3, the oil supply cover is closed, and the start button is pressed. Then, the forward and backward moving cylinder 16 of the guide head 14 is actuated to move the guide head 14 backward, and the guide rod 17 of the guide head 14 is moved by the drive motor 19.
The motor is rotated at a low speed of, for example, about 2 Qrpm.

When the tip of this guide rod 19 reaches the position of the journal part 3a of the cylinder rod 3, the limit switch 32 is turned down by the cam 34 on the side of the guide rod 14, and the timer 33 is activated to operate the amount control valve for a predetermined time. 30 is opened, and the oil pressure from the pump 31 is applied to the oil supply pipe 29. Oil supply section 2
8. The oil is supplied through the gap 23a of the oil supply passage 261 and the oil supply passage 27, and from this ← the journal portion 3
Oil is ejected to the journal portion 3a, and as this operation is repeated, oil is ejected to each journal portion 3a.

In this way, the guide head 14 is retracted and the guide rod 1
7 reaches the predetermined position, the guide head 14 stops its retraction, and at this time the cam receiver moves up and down the cylinder 9 of the platform 8.
is activated and the cam receiver stand 8 is raised, so place the cams +21 and 7 on the cam receiver stand 8 and press the start button.

Then, the back and forth moving cylinder 12 of the rear support stand 10 is actuated to move the rear support stand lO forward, and the back and forth movement cylinder 16 of the guide head 14 is actuated to move the guide head 1 forward.
4 is moved backward, and the tailstock center 13.23 of the rear support stand 10 and guide rod 17 is placed on the cam shaft 7 on the stand 8.
At the same time, the knocking hinge 7a at the front end of the camshaft 7 engages with the engagement hole 24 of the tailstock center 23 of the guide rod 17, and the rear support base 10
As the guide head 14 moves forward, the inner cylinder member 21 of the guide rod 17 sinks into the outer cylinder member 20 against the spring force of the spring member 22, and when this is detected by a limit switch or the like, As for the cam receiver, the stand 8 is lowered, and the rear support stand 10 and the guide head 14 are moved forward together, so that the cam shaft 7 is pushed and held by the front and rear tailstock centers 13 and 23, and the cam of the rod 3 is moved into the cylinder. It is inserted into the support hole 3b. At this time, in the guide head 14, oil is ejected from the tip of the guide rod 17 to each journal portion 3a of the cam support hole portion 3b, as in the case of reversing as described above.

When the camshaft 7 is completely inserted into the cam support hole 3b of the cylinder 3 and installed in this way, this is detected by a limit switch, etc., and the rear support stand 10 retreats to its original position, allowing the next camshaft to be installed. We will be waiting for the installation of part 3.

In the device of this embodiment as described above, the camshaft is held between the guide rod and the tailstock center of the rear support base, and the camshaft is inserted and installed into the cam support hole of the cylinder head while rotating at a low speed. Therefore, the camshaft can be automatically assembled to the cylinder head, greatly improving the installation work efficiency.

In addition, in this device, oil is jetted from the tip of the guide rod when the guide rod is inserted into the cam support hole of the cylinder head, so the insertion of the camshaft into the cam support hole is extremely smooth. There are no scratches or chips.

In the above embodiment, oil is ejected both when the guide rod moves backward and when it moves forward, but it may be ejected only at either one time.

〔Effect of the invention〕

As described above, according to the present invention, the camshaft is held between the guide rod and the rear support base, and the camshaft is inserted into the cam support hole of the cylinder head while being rotated at low speed. Since the oil is spouted into the support hole, the camshaft can be smoothly and automatically assembled to the cylinder head, which has the effect of greatly improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is a side view of a camshaft mounting device according to an embodiment of the present invention, Fig. 2 is a side view of the above device, Fig. 3 is a partially enlarged view of the above device, and Fig. 4 is a cam of a cylinder head. FIG. 6 is a diagram showing a state in which the camshaft is inserted into the support hole. 3... Cylinder head, 3b... Cam support hole, 4
... Shihesodo support stand, 7... Camshaft, 10.
... Rear support stand, 14 ... Guide head, 17 ... Guide rod, 35 ... Oil squirting device.

Claims (1)

[Claims] (1) A device for inserting and attaching a camshaft into a cam support hole of a cylinder head, which passes through a cylinder head support base on which the cylinder head is positioned and placed, and a cam support hole of the cylinder head. a guide head that rotates and moves the guide rod back and forth; the camshaft is held by pressing the rear part of the camshaft and the tip of the guide rod, and the camshaft is moved forward; and a rear support stand inserted into the cam support hole of the cylinder head, and an oil jetting device provided on the guide rod and jetting oil into the cam support hole when the cam support hole is inserted. Features a camshaft mounting device.