JPH0979330A - Propulsion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propulsion device which can release a shaft lock by one touch, and which can eliminate the necessity of times and labor after releasing of the lock. SOLUTION: In a lock mechanism 21, a shaft 7 is locked by a release button 24 when the shaft 7 is pushed to a lock position in a casing 21, and the lock of the shaft 7 is released when the release button 24 is pushed from the outside to the inside of the casing, so that the shaft 7 is advanced in an effecting direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsive force applying device for applying tension to a winding transmission member such as an engine timing chain.

[0002]

2. Description of the Related Art Applicants of the present invention have already proposed this type of propulsive force applying device. An example thereof is shown in FIGS. 11 to 13.

In the propulsive force applying devices shown in FIGS. 11 to 13, a circular case 1 is provided with a circular bottomed hole 2. A flange 3 for attaching to an engine case (not shown) or the like is provided on the outer periphery of the middle portion of the case 1.
have. A cylindrical slider 4 is slidably fitted in the circular bottomed hole 2 of the case 1. A pressing plate 5 for preventing the slider 4 from slipping out of the bottomed hole 2 is attached to the opening end of the case 1 via a locking tool 6 such as a circlip.

Holes are formed in the central portions of the pressing plate 5 and the slider 4, respectively, and a shaft 7 having a shoe portion 7a slidably contacting a winding transmission member at its outer end is inserted into these holes. Has been done. A retaining ring 8 such as an E ring for preventing the shaft 7 from coming out of the slider 4 is attached to an intermediate portion of the shaft 7, and a spring receiving ring 9 fitted to the shaft 7 is adjacent to the retaining ring 8. The push-out spring 1 for pushing out the shaft 7 is provided between the bottom of the bottomed hole 2 and the bottom.
A buffer spring 11 that presses the slider 4 is mounted between the slider 4 and the bottom of the bottomed hole 2.

A screw hole 12 is formed at the rear end of the shaft 7.
Is provided, and a holding bolt 13 that can be screwed into the screw hole 12 is attached to a rear end portion of the case 1. A screw 14 is engraved on the outer peripheral surface of the shaft 7 extending from the middle portion to the outer end portion.

On the other hand, the slider 4 is provided with a spring accommodating recess 15 which opens toward the pressing plate 5, and the bottom surface of the spring accommodating recess 15 has at least one inclined surface with a reduced diameter on the bottom side. Two screw piece pockets 16 are provided. In the screw piece pocket 16, the screw 1 of the shaft 7
Screw piece 1 having a screw portion 17a (FIG. 12) to be screwed with the screw 4
7 is engaged and accommodated. Then, between the pressing plate 5 and the screw piece 17, the screw piece 17 is provided with a screw piece pocket 16
A screw piece pressing spring 18 is mounted so as to engage with.

In FIGS. 11 and 13, reference numeral 19 denotes an O-ring, which is interposed between the engine case and the case 1.
Reference numeral 0 is an O-ring interposed between the case 1 and the holding bolt 13, an arrow a indicates a forward (advance) direction of the shaft, and an arrow b indicates a backward direction of the shaft.

In the propulsion force imparting device having the above construction, the shaft 7 is rotated and retracted against the urging force of the pushing spring 10 before being attached to the engine case or the like, and the holding bolt 13 is inserted into the screw hole 12 thereof. The urging force of the push-out spring is locked by being screwed.

Then, after the case 1 is attached to the engine case or the like through the flange 3 thereof, when the screwing of the holding bolt 13 and the screw hole 12 is released, the shaft 7 is pushed out by the pushing spring 10 and the shoe portion thereof. 7a abuts on the winding transmission member and stops at a position where it has a required tension.

Here, since the screw piece 17 meshes with the shaft 7, the screw piece 17 tries to move forward together with the shaft 7, but since the screw piece 17 is pressed by the screw piece pressing spring 18, the inclination of the screw piece pocket 16 is increased. Since the meshing relationship between the screw piece 17 and the shaft 7 is released by moving in the radial direction along the surface, only the shaft 7 can be moved forward. However,
If there is an overload that pushes back onto this shaft 7,
The screw piece 17 is moved in the diameter reducing direction along the inclined surface of the screw piece pocket 16 by the urging force of the screw piece pushing spring 18 to move the shaft 7
Therefore, the shaft 7 is retracted together with the screw piece 17 and the slider 4 by being buffered by the buffer spring 11.

When the shaft 7 loosened by the winding transmission member advances, both the screw piece 17 and the shaft 7 try to move forward, but the biasing force of the screw piece pushing spring 18 causes the screw piece pocket 16 to move along the inclined surface. It is possible to move only in the shaft 7 by moving in the radial direction. Therefore, the winding transmission member can always have a suitable tension.

[0012]

By the way, as shown in FIG.
In the proposed propulsion force imparting device as shown in FIG. 13, until the device is attached to an engine case or the like, which is a device used,
As shown in Fig. 13, the shaft 7 is locked in advance by a holding bolt 13, and after mounting, the screw hole 12 at the rear end of the shaft 7 and the holding bolt 13 are unscrewed, and
As shown in FIG. 5, the shaft 7 is advanced by the action of the pushing spring 10.

However, in the previously proposed propulsion force applying device, the holding bolt 13 must be screwed again after the shaft 7 is unlocked. The reason is that the holding bolt 1
This is because if 3 is not screwed in, the sealing property will deteriorate. As a result, there is a problem that after the lock of the shaft 7 is released, it is troublesome to screw in the holding bolt 13. Further, after the lock of the shaft 7 is released by the holding bolt 13, re-screwing of the holding bolt 13 may be forgotten. Further, since there is no feeling of whether the holding bolt 13 is unlocked or not, there is a problem that it is difficult to confirm the confirmation.

Therefore, an object of the present invention is to provide a propulsion force imparting device which can unlock the shaft with one touch and does not require any troublesome work after unlocking.

[0015]

In order to solve the above-mentioned problems, according to the present invention, a shaft is inserted in a case so as to be able to advance and retreat in the axial direction, and a pushing spring is directly and indirectly engaged with the shaft and is attached to a device to be used. Until then, in the propulsion force applying device that locks the shaft in the case with the lock mechanism in the state, unlocks the shaft at the time of use, and applies the propulsive force to the shaft with the pushing spring,
The lock mechanism locks the shaft with the release button when the shaft is pushed to the lock position in the case, and unlocks the shaft when the release button is pushed from the outside of the case toward the inside to operate the shaft. It is characterized in that it is configured to advance in the direction.

Further, in order to solve the above-mentioned problems, according to the present invention, the lock mechanism is slidably fitted into a lock hole formed at a rear end portion of a shaft and having a locking portion for locking. When the release button is formed on the rear end of the case and is pushed into the case, the diameter of the lock claw is reduced. And a cam for operating the lock claw in the unlocking direction.

Further, in order to solve the above-mentioned problems, the present invention relates to the lock mechanism, which is slidably fitted to a locking portion protruding from the rear end portion of the shaft and slidably fitted to the case, and normally expands in diameter. However, in the reduced diameter state, when the release button having the lock claw for grasping the locking portion and the release button formed at the rear end of the case and pushed into the case, the lock claw is released to expand the diameter. It is characterized in that it is provided with a cam that operates in the unlocking direction.

Further, the present invention is characterized in that the release button is provided with a stopper for preventing the release button from coming out when the release button is pulled in the backward direction.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a shaft in a locked state,
2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a longitudinal sectional view showing a process of unlocking the shaft, FIG. 4 is a longitudinal sectional view in a state where the shaft is unlocked and the shaft is advanced, and FIG. It is a longitudinal cross-sectional view showing a state in which the release button has returned.

In the first embodiment shown in FIGS. 1 to 5, the same members as those in the propulsive force applying device shown in FIGS. 11 to 13 are designated by the same reference numerals, and further description will be omitted. .

In the first embodiment, a lock mechanism 21 for the shaft 7 is provided at the rear end of the shaft 7 and the rear end of the case 1.

The lock mechanism 21 includes a lock hole 22 formed in the rear end of the shaft 7, a release button 24 slidably fitted in the rear end of the case 1, and a rear end of the case 1. And a cam 30 provided on the side.

A ring-shaped locking portion 23 is provided at the rear end of the lock hole 22.

The release button 24 has a button body 25 having a U-shaped cross section, and four lock claws 2 provided on the inner surface of the button body 25 on the same circumference in this embodiment.
6 are provided. Each lock claw 26 is provided with a toe 26 'formed in a hook shape toward the outside and a stopper 27 for preventing the release button 24 from coming off. In the normal state of this release button 24, as can be seen from FIG. 5, four lock claws 26 are expanded. The toe 26 'engages with the locking portion 23 and locks the shaft 7. The stopper 27 contacts the front end surface of the cam 30 and regulates the release button 24 so as not to come out.

A short sleeve 29 is attached to the rear end of the case 1. The release button 24 is slidably assembled along the sleeve 29. An O-ring 28 is interposed between the outer peripheral surface of the sleeve 29 and the inner peripheral surface of the button body 25 of the release button 24, and the sleeve 29 and the release button 24 are sealed.

The cam 30 is formed on a tapered surface whose diameter gradually decreases in the pushing direction of the release button 24 shown by arrow c in FIG. 3, and when the release button 24 is pushed in the direction of arrow c in FIG. The diameters of the four lock claws 26 are simultaneously reduced.

In the first embodiment having the above-described structure, the shaft 7 is pushed out by the pushing spring 10 as shown in FIG. 1 until the propulsive force applying device is attached to an equipment such as an engine case.
The lock mechanism 21 locks the case 1 inward against the spring force. Then, in this locked state, the toes 26 'of the four lock claws 26 of the release button 24 are inserted into the lock holes 22 formed at the rear end of the shaft 7, and the four lock claws 26 are The diameter has been expanded. In this state, the four lock claws 26 are snap-fitted into the lock hole 22, and the toes 2 of the four lock claws 26 are fitted to the locking portion 23 provided at the rear end of the lock hole 22.
6'is engaged and the shaft 7 is locked so that it cannot be advanced.

After the propulsive force applying device is attached to the equipment such as the engine case, the release button 24 of the lock mechanism 21 is pushed in the direction of arrow c shown in FIG. As described above, when the release button 24 is pressed, the diameters of the four lock claws 26 are simultaneously reduced by the cam 30 formed at the rear end of the case 1. As a result, as shown in FIG. 3, the toes 26 ′ of the four lock claws 26 of the release button 24 are disengaged from the locking portion 23 provided in the lock hole 22, and the shaft 7 is unlocked.

At the moment the lock is released, the shaft 7 can advance to the position where the retaining ring 8 contacts the slider 4 by the spring force of the pushing spring 10, as shown in FIG. However, in the actual machine, it abuts on the winding transmission member and gives a predetermined tension to stop the advancement on the spot.

As described above, when the shaft 7 is unlocked and the shaft 7 is advanced and the pressing force is released from the release button 24, the lock claw 26 is restored by the force used to expand the diameter, as shown in FIG. Then, the four lock claws 26 of the release button 24 are released from the cam 30 and expand in diameter. By any chance
Even if an attempt is made to pull out the release button 24, the stopper 27 provided on the lock claw 26 comes into contact with the front end surface of the cam 30 and regulates the release button 24 so as not to come out of the case 1.

As described above, in the first embodiment, the lock of the shaft 7 can be released by one-touch operation of pushing the release button 24 of the lock mechanism 21. Therefore, no troublesome work such as re-screwing of the holding bolt is required, and since the release button 24 is still attached to the rear end portion of the case 1, the sealing property of the case 1 is also provided via the O-ring. Can be held. Further, it is easy to confirm whether or not the shaft 7 has been unlocked, and if the user is worried, the release button 24 may be pressed many times to confirm. Moreover, in the first embodiment, the lock claw 26
Even if the release button 24 is pulled by any chance, the stopper 27 comes into contact with the front end face of the cam 30 so as not to come out further, even if the release button 24 is pulled by mistake. , Release button 24
Can be prevented from coming out.

In the first embodiment, the number of lock claws 26 is not limited to four.

Next, FIGS. 6 to 10 show a second embodiment of the present invention. FIG. 6 is a longitudinal sectional view of the shaft in a locked state, and FIG. 7 is a sectional view taken along line BB of FIG. 8 is a vertical sectional view showing a process of unlocking the shaft, FIG. 9 is a vertical sectional view showing a state where the shaft is unlocked and the shaft is advanced, and FIG. 10 is a vertical sectional view showing a state where the release button is returned. is there.

In the second embodiment shown in FIGS. 6 to 10, the same members as those of the propulsion force applying device shown in FIGS. 11 to 13 are designated by the same reference numerals.

In the second embodiment shown in FIGS. 6 to 10, a lock mechanism 31 for the shaft 7 is provided at the rear end of the shaft 7.

The lock mechanism 31 includes a lock engaging portion 33 protruding from the rear end of the shaft 7, a release button 34 slidably fitted to the rear end of the case 1, and a case. 1 and a cam 39 provided on the rear end side thereof.

The locking portion 33 is connected to the rear end portion of the shaft 7 via the neck portion 32.

The release button 34 is provided with a button body 35 having a U-shaped cross section, a boss 36 projecting from the center of the button body 35, and an integral circle with the boss 36. It is configured to have four lock claws 37 provided on the circumference. The locking portion 33 is provided on each lock claw 37.
There are provided a toe 37 'for gripping and a key-shaped stopper 38 that comes into contact with the front end surface of the cam 39. Then, the four lock claws 37 grasp the locking portion in the diameter-reduced state, and when the external force is released from the diameter-reduced state, the diameter is returned to the normal position by expanding the diameter.

The cam 39 is formed in a shape in which the rear end portion of the case 1 is stepwise reduced in diameter, and has four lock claws 37.
At the same time, and in this state the toe 3 of the lock claw 37
The 7'grips the locking portion 33. Following the cam 39, a sleeve 40 is continuously provided at the rear end of the case 1.

An O-ring 41 is interposed between the inner peripheral surface of the sleeve 40 and the outer peripheral surface of the boss 36 of the release button 34. The O-ring 41 seals between the sleeve 40 and the release button 34. Has been done.

Also in the second embodiment having the above-mentioned structure, as shown in FIG. 6, the shaft 7 is resisted against the spring force of the pushing spring 10 in the case 1 until the propulsive force applying device is attached to the equipment to be used. The lock mechanism 3 in this state.
It is locked by 1. In such a locked state, the locking portion 3 provided at the rear end of the shaft 7 through the neck portion 32 is projected.
3 is provided on the release button 34 via the boss 36
The four lock claws 37 are gripped by the toes 37 ′ of the book lock claws 37, and the four lock claws 37 are forcibly reduced in diameter by the cam 39 to lock the shaft 7 so as not to advance.

After attaching the propulsive force applying device to the equipment used, the release button 34 of the lock mechanism 31 is pushed in the direction of arrow c shown in FIG. As described above, when the release button 34 is pressed, the four lock claws 37 are released from the cam 39 and the diameter is expanded at the same time. As a result, as shown in FIG. 8, the toes 37 ′ of the four lock claws 37 of the release button 34 become the shaft 7.
The locking portion 33 provided at the rear end portion is released to unlock the shaft 7.

At the moment when the lock is released, the shaft 7 can be advanced to the position where the retaining ring 8 contacts the slider 4, as shown in FIG. 9, by the spring force of the pushing spring 10. However, in the actual machine, it abuts on the winding transmission member and gives a predetermined tension to stop the advancement on the spot.

As described above, the shaft 7 is unlocked, and after the shaft 7 advances, the release button 34 is returned as shown in FIG. At this time, even if an attempt is made to pull out the release button, the stoppers 38 provided on the lock claws 37 of the release button 34 come into contact with the cams 39 formed on the case 1 to prevent the release button 34 from coming out of the case 1. Regulate.

As described above, also in the second embodiment, similarly to the first embodiment, the shaft 7 can be unlocked with a single touch by pushing the release button 34 of the lock mechanism 31. Furthermore, after releasing the lock, no troublesome work is required and the release button 34
Is a state of being attached to the rear end side of the case 1,
Moreover, the sealing property of the case 1 can be maintained as it is by the O-ring. Further, it is easy to confirm whether or not the shaft 7 is unlocked, and if the user feels uneasy, the release button 34 may be pushed in any number of times to confirm. further,
Also in this second embodiment, each lock claw 37 is provided with a stopper 38, and when the release button 34 is pulled,
Since the stopper 38 is in contact with the cam 39 so as not to come out further, it is possible to prevent the release button 34 from coming out even if the release button 34 is pulled by mistake.

Further, in the second embodiment, the number of lock claws 37 is not limited to four.

[0048]

As described above, according to the first aspect of the present invention.
According to the described invention, the lock mechanism of the shaft is locked by the release button when the shaft is pushed to the lock position in the case, and when the release button is pushed inward from the outside of the case, the shaft is locked. Since it is configured to release the lock and advance the shaft in the working direction, there is an effect that the shaft can be unlocked with one touch by pressing the release button, and the holding bolt is re-threaded after unlocking. There is an effect that all the troubles such as the deterioration of the sealing property due to forgetting to re-screw the holding bolt can be solved without any troublesome work.

According to the second aspect of the present invention, the lock mechanism can slide on the case and the lock hole formed at the rear end of the shaft and having the locking portion for locking. A release button that has a locking claw that is fitted to and that normally expands in diameter and snap-fits to the locking portion, and the release button that is formed at the rear end of the case and is pushed inward in the case. It is configured with a cam that reduces the diameter of the pawl and operates the locking pawl in the unlocking direction.It has the effect of unlocking the shaft with one touch by pressing the release button. The effect is that all the troublesome work such as re-screwing the holding bolt can be omitted, and the release button is still attached to the rear end of the case 1 and has an O-ring, so the case sealability is improved. There are effects that may hold, or to release the lock of the shaft, it is easy to whether or not a confirmation, there is also an effect that may be confirmed by pressing several times the release button if it is anxiety.

Further, according to the invention described in claim 3 of the present invention, the lock mechanism is slidably fitted to the locking portion protruding from the rear end of the shaft and in the normal state. When the release button is formed in the rear end of the case and is pushed into the case, the lock claw is released and expanded. It is configured to have a cam that is operated in the unlocking direction by making it diameter, and in the present invention also, there is an effect that the shaft can be unlocked with a single touch of pressing the release button. There is an effect that all the troublesome work such as re-screwing of the bolt can be omitted, and since the release button is still attached to the rear end side of the case, there is an effect that the sealing property of the case can be maintained. ,shaft Or to release the lock, it is easy to whether or not a confirmation, there is also an effect that may be confirmed by pressing several times the release button if it is anxiety.

According to the fourth aspect of the present invention, the release button is provided with a stopper for preventing the release button from coming out when the release button is pulled in the backward direction, and the release button is pulled by any chance. At this time, since the stopper abuts on the front end surface of the cam and prevents the stopper from coming out further, even if the releasing button is accidentally pulled, the releasing button can be prevented from coming out.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is a longitudinal sectional view of a shaft in a locked state.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing a process of unlocking the shaft in the first embodiment.

FIG. 4 is a longitudinal sectional view showing a state in which the shaft is unlocked and the shaft is advanced in the first embodiment.

FIG. 5 is a vertical cross-sectional view showing a state in which the release button has returned in the first embodiment.

FIG. 6 shows a second embodiment of the present invention and is a vertical sectional view of the shaft in a locked state.

7 is a cross-sectional view taken along the line BB of FIG.

FIG. 8 is a longitudinal sectional view showing a process of unlocking the shaft in the second embodiment.

FIG. 9 is a vertical cross-sectional view showing a state in which the shaft is unlocked and the shaft is advanced in the second embodiment.

FIG. 10 is a vertical cross-sectional view showing a state in which the release button has returned in the second embodiment.

FIG. 11 is a longitudinal cross-sectional view showing the already proposed propulsion force applying device in a state where the shaft is locked.

12 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 13 is a vertical cross-sectional view of the already proposed propulsion force imparting device with the shaft unlocked.

[Explanation of symbols]

 1 Case 2 Circular Bottom Hole 3 Mounting Flange 4 Slider 7 Shaft 10 Extrusion Spring 11 Buffer Spring 17 Screw Piece 18 Screw Piece Pushing Spring 21 Lock Mechanism 22 Lock Hole 23 Locking Part 24 Release Button 25 Button Body 26 Lock Claw 26 'Toe 27 Stopper 30 Cam 31 Lock mechanism 33 Locking part 34 Release button 35 Button body 37 Locking claw 37' Toe 38 Stopper 39 Cam

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Kobayashi 3131 Miyata-mura, Kamiina-gun, Nagano Prefecture

Claims (4)

[Claims] 1. A shaft is inserted into a case so as to be able to advance and retreat in the axial direction, and a push spring is directly and indirectly engaged with the shaft, and the shaft is locked in the case until it is attached to a device to be used. In a propulsion force applying device that is locked by a mechanism, the shaft is unlocked at the time of use, and a propulsive force is applied to the shaft by a push-out spring. The propulsive force imparting device is configured so that the shaft is locked by the lock, and when the release button is pushed inward from the outside of the case, the shaft is unlocked and the shaft is advanced in the working direction. . 2. The lock mechanism is formed in a rear end portion of a shaft and has a lock hole having a locking portion for locking, and the case is slidably fitted to the case and normally expands in diameter to lock the lock mechanism. When a release button having a lock claw snap-fitted to a portion and a release button formed at the rear end of the case is pushed into the case, the lock claw is reduced in diameter and the lock claw is operated in the unlocking direction. The propulsion force imparting device according to claim 1, further comprising a cam. 3. The locking mechanism includes a locking portion projecting from a rear end of a shaft and a locking portion slidably fitted to the case and expanding in a normal state and locking the locking portion in a reduced diameter state. A release button having a lock claw to be grasped, and a cam which is formed at the rear end of the case and releases the lock claw when the release button is pushed into the case to expand the diameter and operate in the unlocking direction. It is comprised, It is characterized by the above-mentioned.
The described propulsion device. 4. The propulsion force imparting device according to claim 2, wherein the release button is provided with a stopper that prevents the release button from coming out when the release button is pulled in the backward direction.