JPH052305Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an end bolt chuck tightening device for chucking and tightening an end bolt to a cylinder head.

(Prior art) Conventional end bolt chuck tightening device 100
As shown in FIGS. 5 and 6, the socket portion 101 is provided with a slotted portion 102, and this slotted portion 102 is provided with a gripping claw 103 for checking the outer periphery of the head of the end bolt W. This gripping claw 103 is biased in a direction to press the outer periphery of the end bolt W by a spring 104 to clamp the end bolt W, and the socket part 101 is rotated by a rotation mechanism (not shown) to attach the end bolt W to the cylinder head (not shown). (as shown).

(Problem to be solved by the invention) In the case of the conventional end bolt chuck tightening device, the tightening force when tightening the end bolt causes cracks in the slot in the socket, eventually causing damage to the socket. This has caused a problem in that the end bolt cannot be tightened.

The present invention was devised in view of the problems of the conventional technology, and its purpose is to be able to reliably check the end bolt and to apply tightening force to the socket part. Another object of the present invention is to provide a chuck tightening device for end bolts that is durable and free from defects such as cracks.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a socket part that engages with the outer periphery of the end bolt head, and a socket part that is fixed at the center of the socket part and whose tip is closer to the tip surface of the socket part. It consists of a chuck pin that protrudes and has a slot in the axial direction that is larger in diameter than the oil hole formed in the end bolt, and an elastic member that is clamped into the slot near the tip of the chuck pin. .

(Operation) When the chuck pin is inserted into the oil hole of the end bolt passing through the shaft center and the socket portion is engaged with the outer periphery of the end bolt head, the elastic force of the elastic member held in the slot near the tip of the chuck pin is released. As a result, a force acts in the direction of widening the width of the slot at the tip of the chuck pin, and as the chuck pin presses against the wall of the oil hole, part of the elastic body protrudes from the slot and comes into contact with the oil hole with elastic force. Be sure to check the end bolt as it will touch. Then, by rotating the socket part, the end bolt is tightened to the cylinder head.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a cross-sectional view of a main part of the end bolt chuck tightening device according to the present invention, showing how it is used, and FIG. 2 is a bottom view thereof.

As shown in Fig. 1, the end bolt chuck tightening device 1 has a hexagonal large diameter hole 2 at the tip of a vertical movement mechanism (not shown) and a rotation mechanism (not shown), and a small diameter hole opened in this large diameter hole 2. A socket part 4 with a hole 3 formed therein is provided, and the socket part 4 is fitted into the small diameter hole 3 of this socket part 4, and the tip 5 protrudes from the tip surface 6 of the socket part 4, and has a larger diameter than the oil hole W1 of the end bolt W and has a shaft. It is constructed by fixing a cap pin 8 having a slotted portion 7 in the direction to the socket portion 4 with a fixing bolt 9. Further, an elastic member 10 is sandwiched in the slot 7 near the tip 5 of the chap pin 8, and the end bolt W
When the chuck pin 8 is not checked, the elastic force of the elastic member 10 is applied to the tip 5 of the chuck pin 8, as shown in FIG.
The width of the slotted portion 7 is slightly widened.

The operation of the end bolt chuck tightening device constructed as described above will be explained below.

Oil hole W1 of end bolt W passing through the shaft center
The chuck pin 8 is moved by a vertical movement mechanism (not shown).
When the socket portion 4 is engaged with the outer periphery of the hexagonal head W2 of the end bolt W and inserted to a predetermined position while inserting the chuck pin 8, the slot portion 7 near the tip 5 of the chuck pin 8 is inserted.
Due to the elastic force of the elastic member 10 sandwiched between the chuck pins 8 and 8, a force acts in the direction of widening the width of the slotted portion 7 of the tip 5 of the chuck pin 8, causing the chuck pin 8 to press against the wall surface of the oil hole W1 and as shown in FIGS. As shown in FIG. 4, a part of the elastic member 10 protrudes from the slot 7 and comes into contact with the oil hole W1 with elastic force, so that the end bolt W can be chucked reliably.
The end bolt is then tightened to the cylinder head by rotating the socket portion 4 by a rotation mechanism (not shown).

(Effects of the invention) As explained above, according to the invention, the chuck of the end bolt is simple, and by inserting an elastic member into the slot near the tip of the chuck pin, the chuck holding force of the chuck pin increases and the elastic By elastically contacting the member with the oil hole, it is possible to prevent the end bolt from falling during transportation of the end bolt.

Further, since the socket part is not provided with a slotted part and is structured only for tightening, the socket part does not crack when tightening.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts showing the end bolt chuck tightening device of the present invention in use, Fig. 2 is a bottom view of the same, and Fig. 3 is a view of the vicinity of the tip of the chuck pin showing a state in which the end bolt is not chucked. 4 is a side view of the vicinity of the tip of the chuck pin showing a state in which the end bolt is chucked; FIG. 5 is a sectional view of essential parts showing the state in which a conventional end bolt chuck tightening device is used; FIG. 6 is also a bottom view. In the drawings, 1 is a chuck tightening device for the end bolt, 4 is a socket portion, 7 is a slotted portion, 8 is a chuck pin, 10 is an elastic member, and W is an end bolt.

Claims (1)

[Scope of utility model registration request] An end bolt chuck tightening device for chucking and tightening an end bolt having an oil hole penetrating the shaft center includes a socket portion that engages with the outer periphery of the end bolt head, and a socket portion that is fixed to the center of the socket portion. a chuck pin whose distal end protrudes from the distal end surface of the socket portion, and has a diameter larger than the oil hole and a slotted portion in the axial direction;
A chuck tightening device for an end bolt, characterized in that an elastic member is provided between the slots near the tip of the chuck pin.