JPH0243624Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a press-fitting device used for press-fitting a crankshaft or other shaft member into a shaft hole formed in a crankcase or other workpiece.

Conventionally, this type of work has generally been carried out by first lowering the workpiece to the side from the conveyance path, which has the disadvantage of impairing workability.

The purpose of the present invention is to obtain a device free of such inconveniences, and a pallet 2 guided on a conveyance path 1 is provided with a pallet 2 facing the shaft hole b of a crankcase or other workpiece a set on the upper surface of the pallet 2. A through hole 3 is formed on the lower side of the shaft member c, which is inserted into the shaft hole b from above, so as to face the inside of the through hole 3, and a shaft member c on the machine frame 4, which can be raised and lowered, is formed below the shaft member c. cylinder 5
A piston 6 that is movable up and down in the cylinder 5 and a rotating shaft 7 that is inserted through the piston 6 and supported immovably in the axial direction are provided. A freely insertable nozzle 8 and the rotating shaft 7
A socket 9 extending inside the nozzle 8 is provided protruding from the nozzle 8.

To explain this further with reference to the illustrated embodiment, the conveying path 1 comprises, for example, a roller conveyor, the pallet 2 is guided on its upper surface, and is stopped at a predetermined conveying position and actuated by an actuating cylinder 10. It can be fixed at that position by the pin 11 in the position. The workpiece a consists of a crankcase that is positioned and fixed on the pallet 2, and the shaft hole b consists of an inner race of a ball bearing that is fitted into the crankcase, and the shaft member c is inserted into the crankcase. It consists of a crankshaft.

Furthermore, the machine frame 4 is guided by a separate operating cylinder 12 to a guide post 13 and is moved up and down, and the rotating shaft 7 is supported in the piston 6 so as to be rotatable but not vertically movable. The socket 9 is connected to the nut runner 14 at its end, and furthermore, the socket 9 engages with the engagement hole 15 at the upper end of the rotating shaft 7 at its root end, and as the socket 9 rotates, the socket 9 connects to the nut runner 14 through the seat 16. It is supported by a spring 17 so as to be freely movable downward against the spring 17, and is further provided with a spiral 18 on the inner periphery at its tip so that it can be screwed into a spiral on the outer periphery of the lower end of the shaft member c. The nozzle 8 extends around the outer periphery of the socket 9, and is provided with a stopper 19 at its tip so that the stopper 19 comes into contact with the lower surface of the shaft hole b.

Furthermore, in the illustrated example, a lifting head 2 is provided above the pallet 2 and is moved up and down by a separate actuating cylinder 20.
a guide sleeve 2 into which the shaft member c, that is, the upper end of the crankshaft is inserted;
2 and a stopper bolt 23 on the upper side of the guide sleeve 22, and a key 24 on one side of the guide sleeve 22 that can be freely engaged with a key groove on the upper end, so that when the elevating head 21 moves downward, In this case, the crankshaft c has its upper end connected to the guide sleeve 22.
It is supported by the stopper bolt 23 and is prevented from rotating by the key 24.

Furthermore, in the illustrated example, the inside of the cylinder 5 is connected to a hydraulic power source 26 via a switching valve 25, and the working cylinder 10, the working cylinder 12, and the working cylinder 20 are connected to each switching valve 27, 28, 29. to a source of pressurized air 30 via the nut runner 14.
is communicated with the air source 30 via a switching valve 31 and driven thereby.

To explain its operation, if the machine frame 4 is moved upward from a state in which the pallet 2 is stopped and positioned at a predetermined position, the nozzle 8 is moved upward accordingly, for example, as shown in the third figure. The abutment 19 at the upper end is brought into contact with the lower surface of the shaft hole b. At this time, the piston 6 is moved upward within the cylinder 5, and the socket 9 is thereby moved upward within the nozzle 8 and comes into contact with the lower end of the shaft member c as shown in the figure. If the rotating shaft 7 is rotated in this state, the socket 9 will rotate accordingly, and the spiral 18 at its tip will rotate.
The socket 9 is screwed onto the lower end of the shaft member c, and the socket 9 and the shaft member c are connected to each other. Next, when the piston 6 is moved downward within the cylinder 5, the socket 9 is moved downward together with the shaft member c, and the member c is moved downward as shown in the second figure. It is obtained in a state where it is press-fitted into the shaft hole b. Next, if the rotating shaft 7 is reversed, the socket 9
Since it is unscrewed from the shaft member c, next, when the machine frame 4 is moved downward and the piston 6 is moved downward within the cylinder 5, it returns to its original state and is ready for its operation. . In the above-described operation, the other end of the shaft member c, that is, its upper end, is held in the guide sleeve 22 by the downward movement of the elevating head 21.

In this way, according to the present invention, while the workpiece a is left on the conveyance path 1 on the pallet 2, the shaft member c inserted in advance into the shaft hole b is inserted into the shaft hole b.
This method eliminates the above-mentioned disadvantages of the conventional method in which this is done by first lowering the nozzle 8 and the socket 9 upward, and the operation is performed by moving the nozzle 8 and socket 9 up once and then It is sufficient to rotate the socket 9 with the rotating shaft 7 at its root, and then move the piston 6 on its outer periphery downward in the cylinder 5, which is relatively simple and reliable, and the rotation of the rotating shaft 7 is simple. This allows the socket 9 to be engaged and disengaged from the shaft member c by motion, and has the effect of making the device relatively simple and compact in structure.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of one example of the present device, FIG. 2 is an enlarged cross-sectional side view of its essential parts, and FIG. 3 is a partial cross-sectional side view illustrating its operation. 1... Conveyance path, 2... Pallet, a... Work, b... Shaft hole, 3... Through hole, c... Shaft member, 4
...Machine frame, 5...Cylinder, 6...Piston, 7
... Rotating shaft, 8... Nozzle, 9... Socket.

Claims (1)

[Scope of utility model registration request] Crankcases and other workpieces a are placed on the pallet 2 that is guided along the conveyance path 1.
A through hole 3 is formed on the lower side opposite to the shaft hole b, and the shaft member c, which is inserted into the shaft hole b from above, faces into the through hole 3 and can be freely raised and lowered below the shaft hole b. A cylinder 5 is provided on a machine frame 4, a piston 6 within the cylinder 5 is movable up and down, and a rotating shaft 7 is inserted through the piston 6 and supported immovably in the axial direction. A press-fitting device for a shaft member, comprising a nozzle 8 that can be freely inserted into the through hole 3 from below, and a socket 9 that extends from the rotating shaft 7 and extends inside the nozzle 8.