JPH056068Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a positioning mechanism for a movable member that reciprocates within a through hole, and more specifically to a detent ball assembly jig.

[Conventional technology]

Conventionally, as a system employing this type of positioning mechanism for a reciprocating movable member, a power shift device for an auxiliary transmission disclosed in Japanese Utility Model Application Publication No. 18153/1983 as shown in FIGS. be.

That is, in the drawing, 1 is a double-acting actuator, which operates by supplying and discharging fluid pressure from an appropriate pressure source 4 supplied through solenoid valves 2 and 3, which are turned on and off in response to a speed change signal. be. A forkshaft 5 operated by the actuator 1 shifts the speed of a sub-transmission (not shown), and the fork shaft 5 is fitted into a main passage 7 of a sub-transmission case 6 so as to reciprocate. The forkshaft 5 is formed with shift check grooves 5a, 5b and a neutral check groove 5c.

A side hole 8 formed perpendicularly to the main passage 7 of the sub-transmission case 6 is provided with a coil spring 9 and a detent ball 10 biased by the coil spring 9.
are arranged, and this detent ball 10 is placed in the shift check grooves 5a, 5b of the forkshaft 5.
By fitting into the neutral check groove 5c, the forkshaft 5 is restrained to the shift position and the neutral position, and positioning is performed. That is, this is a positioning mechanism based on the ball end of the detent ball 10. In the figure, 11 is an insertion hole formed directly above the side hole 8 in the peripheral wall of the through hole 7, 12 is a clutch pedal, and 13 is a high/low speed changeover switch.

Here, the above positioning mechanism is assembled, that is, the coil spring 9 and detent ball 10 are arranged in the side hole 8 of the sub-transmission case 6, and the fork shaft 5 is fitted into the through hole 7 so as to reciprocate. To assemble, first, the coil spring 9 and detent ball 10 are sequentially inserted through the insertion hole 11 of the sub-transmission case 6, as shown in FIG. Next, the fork shaft 5 is inserted into the main passage 7 while pushing the detent ball 10 against the elastic force of the coil spring 9 using the tip 14a of the flathead screwdriver 14 inserted from one end of the main passage 7.

[Problem that the invention attempts to solve]

However, in the above conventional example, the tip 14a of the flathead screwdriver 14 is connected to the detent ball 10.
The shape is not suitable for pushing. That is, the tip 14a of the flathead screwdriver 14 is flat and contacts the detent ball 10 at a point, and since the detent ball 10 is biased by the coil spring 9, the tip of the flathead screwdriver 14 When the detent ball 10 is pushed into the side hole 8 using the screwdriver 14a against the elastic force of the coil spring 9, the tip 14a of the flathead screwdriver 14 slides on the surface of the detent ball 10, causing the ball 10 to be blown off. It becomes difficult to push the detent ball 10 into the side hole 8, especially when the coil spring 9 is long and the detent ball 10 protrudes into the main passage 7.

[Means for solving problems]

The present invention was developed to solve the various drawbacks mentioned above.A detent ball with a movable shaft is inserted into a through hole so as to be able to reciprocate, and is inserted through the insertion hole and pushed into the side hole. A ball presser having a ball pushing tool having a pushing rod, a long groove that is inserted from one end of a through hole through which the pushing rod can freely pass, and a holding part formed on an outer circumferential surface so that a detent ball can be pushed into a side hole. It is an object of the present invention to provide an assembly jig that can easily and reliably assemble a positioning mechanism by comprising the following tools.

[Structure of the idea]

Hereinafter, the present invention for achieving the above object will be described in detail based on embodiments of the drawings. In addition, FIG. 1 is a longitudinal sectional view of the positioning mechanism according to the present invention, FIGS. 2 and 3 are perspective views showing an assembly jig for the same positioning mechanism, and FIGS. 4 to 7 are the same assembly jig. It is an explanatory diagram of the usage state.

In the drawing, 21 is a housing, and this housing 21 has a through hole 2 passing through it in the horizontal direction.
2, and a bottomed side hole 23 perpendicular to this through hole 22.
In the peripheral wall of the through hole 22, an insertion hole 24 for a coil spring 27 communicating with the outside and a detent ball 28 is formed directly above the side hole 23.
is formed.

A movable shaft 25 is inserted into the through hole 22 so as to reciprocate in an airtight manner, and a check recess 26 is formed in a part of its outer periphery, and one end of the movable shaft 25 is formed into a hemispherical shape 25a. ing. Further, a coil spring 27 and a detent ball 28 are arranged in the side hole 23, and when the detent ball 28 biased by the coil spring 27 fits into the check recess 26 of the movable shaft 25, the movable shaft 25 moves to the corresponding position. temporarily fixed.

Reference numeral 29 denotes a ball pushing tool, which is composed of a pushing rod 30, a regulating head 31 and a knob portion 32 fixed to the upper end of the pushing rod 30. Push rod 3
0 has a diameter that allows it to be inserted into the insertion hole 24, its tip surface is formed in a recess 30a that is the same as the spherical shape of the check ball 28, and the regulating head 31 has a diameter that is almost the same as that of the insertion hole 24. The knob portion 3
2 has a considerably larger diameter than the insertion hole 24.

Reference numeral 33 denotes a ball presser, which is composed of a presser portion 34, a knob portion 35, and a connecting rod 36 that connects the two.The presser portion 34 has approximately the same diameter as the through hole 22 and is The presser portion 34 has a long groove portion 37 formed on its generatrix from the tip end to the vicinity of the rear end portion, into which the push rod 30 can be freely inserted. In addition, the knob portion 35 is connected to the through hole 2.
It is formed to have a larger diameter than the diameter of No. 2. Note that the distal end surface of the presser portion 34 is connected to the distal end portion 25a of the movable shaft 25.
It is formed into a hemispherical recess to fit.

"Operation of the Embodiment" Next, the operation of the above embodiment will be explained with reference to the assembly diagrams of FIGS. 4 to 7.

First, as shown in FIG. 4, the coil spring 27 is inserted into the side hole 23 through the insertion hole 24 of the housing 21, and then the detent ball 28 is placed on the coil spring 27. Next, as shown in FIG.
a to contact the detent ball 28.

When the ball pushing tool 29 is pushed in, the detent ball 28 is pushed into the side hole 23 from the through hole 22 against the elastic force of the coil spring 27. At this time, the regulating head 31 of the ball pushing tool 29 is inserted into the insertion hole 2.
Fits into 4.

Next, in the above state, as shown in FIG. 6, the holding part 34 of the ball holding tool 33 is inserted from one end of the through hole 22. At this time, the long groove part 37 of the holding part 34 is inserted into The rod 30 enters, and the pushing rod 30 and the presser portion 34 form a cross shape.

In this state, after pulling out the push rod 30 from the long groove 37 of the presser part 34, as shown in FIG. The detent ball 28 can be completely pushed into the side hole 23 by the outer peripheral surface of the portion 34.

Next, when the movable shaft 25 is inserted from the other end of the through hole 22 and the distal end 25a is brought into contact with the distal end of the holding part 34 and pushed further, the distal end of the movable shaft 25 passes through the side hole 23. At the same time, the ball presser 33 is pushed out from the through hole 22. As a result, the movable axis 2
A detent ball 28 biased by a coil spring 27 is pressed against the outer peripheral surface of the ball 5 . Then, when the movable shaft 25 slides and the detent ball 28 biased by the coil spring 27 fits into the check recess 26 of the movable shaft 25, the movable shaft 25 is temporarily fixed at that position.

[Effect of idea]

As mentioned above, the present invention has a detent ball 2 of a movable shaft 25 inserted into a through hole 22 so as to be able to reciprocate.
8 through the insertion hole 24 and pushed into the side hole 23.
Then, insert the push rod 3 from one end of the through hole 22.
The coil spring 27 is composed of a ball presser 33 having a long groove portion 37 through which the detent ball 28 can be freely penetrated, and a presser portion 34 formed on the outer peripheral surface so that the detent ball 28 can be pushed into the side hole 23. Regardless of the length, the positioning mechanism consisting of the movable shaft 25, coil spring 27, detent ball 28, etc. can be assembled easily and reliably.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of the positioning mechanism according to the present invention, Fig. 2 and Fig. 3 are perspective views showing an assembly jig for the positioning mechanism, Fig. 4 to Fig. 7 are explanatory diagrams of the use of the assembly jig, Fig. 8 is a system diagram of a power shift device for an auxiliary transmission showing a conventional example, Fig. 9 is a cross-sectional view of a check mechanism in the device, and Fig. 10 is an explanatory diagram of the assembly of the mechanism. 21...Housing, 22...Through hole, 23...
...side hole, 25...movable shaft, 26...check recess, 27...coil spring, 28...detent ball, 29...ball pusher, 30...push rod, 33...ball holder, 34...holding portion.

Claims (1)

[Scope of utility model registration request] A ball pushing tool having a pushing rod for inserting a detent ball of a movable shaft reciprocably inserted into the through hole into the side hole and inserting it from one end of the through hole so that the pushing rod can freely penetrate. 1. An assembly jig for a positioning mechanism, comprising a ball presser having a long groove and a presser portion formed on the outer peripheral surface so as to force a detent ball into a side hole.