JP3883192B2 - Ratchet tensioner resin plunger stopper - Google Patents

Abstract

PURPOSE: To provide a plunger stopper made of resins in which a pull-out operation of the plunger stopper can be simply achieved without damaging a ratchet mechanism of a ratchet type tnesioner and the rushing out of the plunger can be simply prevented in attaching work of the tensioner to an engine block and in attaching/detaching work of a chain or the like. CONSTITUTION: The plunger stopper 10 made of resins is for temporarily stopping the rushing-out of the plunger 23 by being used for the ratchet type tensioner 20. A torsional torque absorption part 13 to absorb the torsional torque generated to a lug piece is formed between a forked stopping piece 11 inserted so as to be clamped between a housing body 22 and a ratchet claw body 24, in a state of straddling a spring 25 for the ratchet claw body in a recessed groove 22A and the lug piece 12 extended from the stopping piece 11 and protruded to the outside of the housing body 22.

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a ratchet tensioner accessory that applies appropriate tension to a timing belt, a timing chain, etc. of a vehicle engine, and in particular, a plunger stop for temporarily stopping a plunger from being used in the ratchet tensioner. Concerning ingredients.
[0002]
[Prior art]
A ratchet-type tensioner that suppresses vibrations that occur when the timing belt or timing chain that transmits rotation between the crankshaft and camshaft of the engine is running and maintains proper tension is a plunger that protrudes from the housing body. Is configured to apply tension by sliding the shoe surface of the tensioner lever to the slack side of the chain by pressing the back surface near the swinging end of the tensioner lever that is pivotally supported on the engine body side. It has become.
[0003]
Therefore, as shown in FIG. 13, the plunger 33 is urged by the plunger spring 36 in the housing main body 32 and protrudes so as to freely protrude and retract, and the ratchet pawl body shaft 34A provided on the housing main body 32 swings. A conventional ratchet-type tensioner having a ratchet pawl 34 that is freely pivoted and biased by a ratchet pawl spring 38 is provided at the end of the shaft 34 </ b> A of the ratchet pawl 34 that protrudes outside the housing body 32. When the ratchet tensioner 31 is shipped or attached to the engine block, the ratchet teeth 33A and the ratchet pawl 34B are engaged with each other as shown in FIG. At the same time, the stopper pin 39 is inserted into the pin insertion hole 37A of the external plate 37, and at the same time, the stopper pin 3 15 is brought into contact with the outer wall end surface 32A of the housing body 32, or as shown in FIG. 15, the stopper pin 39 is brought into contact with the peripheral wall 32B of the stopper hole drilled in the housing body 32 so that the plunger 33 jumps out of the housing body 32. The stopper pin 39 is removed after being held and attached to the engine block (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 326037 (second page, FIGS. 5 to 10)
[0005]
However, such a conventional ratchet type tensioner 31 only requires a drilling process for inserting the stopper pin 39 into the housing body 32 and an external plate 37 for forcibly swinging the ratchet pawl 34. In addition, since a processing step for fixing the outer plate 37 to the shaft 34 is required, not only the manufacturing burden and the manufacturing cost are increased, but also the stopper pin 39 is inserted into the pin insertion hole 37A of the outer plate 37 to be removed from the housing main body 32. When avoiding the protrusion of the plunger 33, if the gap between the housing body 32 and the engine block side is small, the stopper pin 39 comes into contact with the engine block side and it becomes difficult to insert and remove the stopper pin 39. Installation work, removing or attaching the chain There is a problem that can not be easily performed, such as work or.
[0006]
Accordingly, in order to solve the above-described problems, a housing for the ratchet tensioner 40 as shown in FIGS. 16 to 17 is used as the plunger stopper 41 of the ratchet tensioner 40 developed by the present applicant and already applied for a patent. A bifurcated restraining piece 41A inserted so as to be sandwiched between the housing main body 42 and the ratchet pawl body 44 in a state of straddling the ratchet pawl spring 45 in the concave groove 42A formed in the main body 42; There is one provided with a knob 41B extending from the restraining piece 41A to the outside of the housing main body 42 and protruding.
Here, reference numeral 43 shown in FIGS. 16 to 17 is a plunger that protrudes and retracts from the housing body 42, reference numeral 43A is a ratchet tooth carved on the outer peripheral surface of the plunger 43, and reference numeral 42B is An attachment hole for attaching the housing body 42 to the engine block.
[0007]
[Problems to be solved by the invention]
However, when the plunger restraining device 41 of the ratchet type tensioner 40 developed by the present applicant as shown in FIG. 18 is pulled out so as to be twisted from the state in which the knob 41B is inserted, the knob 41B. There is a possibility that the bifurcated restraining piece 41A constructed integrally from the above will be in a clamped state in which the ratchet pawl spring 45 is twisted, and the restraining piece 41A will be pulled up together with the ratchet pawl spring 45 to damage the ratchet mechanism. There has been a contrivance to easily achieve the operation of pulling out the plunger stopper 40.
[0008]
Accordingly, an object of the present invention is to eliminate the problems of the prior art as described above, and to perform the pull-out operation of the plunger stopper without damaging the ratchet mechanism of the ratchet tensioner by simple insertion / extraction without insertion obstruction. A ratchet type tensioner plunger restrainer that can easily achieve the above and can easily restrain the plunger from popping out in the operation of attaching the tensioner to the engine block, attaching the chain, or removing the chain.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a housing body attached to a vehicle engine block, a plunger that is spring-biased from the housing body and protrudes outward, and a housing body that opens toward the plunger. And a ratchet pawl body that swings in a pivoted state, and a ratchet pawl spring that biases the ratchet pawl body with the ratchet teeth on the outer peripheral surface of the plunger. In order to temporarily stop the plunger from protruding by using the ratchet tensioner, the ratchet pawl spring spans the ratchet pawl spring in the concave groove with an inner crotch interval larger than the outer diameter of the ratchet pawl spring. A bifurcated restraining piece to be inserted between the housing body and the ratchet pawl in a state and extending from the restraining piece to the outside of the housing body In plastic plunger stop member having a knob piece to cause the picked absorb torsional torque occurs seen piece torsion torque absorption site is formed at least between the knob piece with stop pieces.
[0010]
The specific form of the “torsional torque absorbing portion” in the present invention is from the pick piece to the stop piece with a rigidity smaller than the rigidity caused by the form of the pick piece or the stop piece. As long as the transmission of the torsional torque can be significantly suppressed, any configuration such as a linear configuration, a curved configuration, or a combination thereof may be used.
[0011]
[Action]
The ratchet-type tensioner plunger restrainer according to the present invention has a bifurcated restraining piece extending from the picking piece while holding the picking piece manually when trying to temporarily stop the plunger from popping out. The stop piece is inserted between the housing body and the ratchet claw body in a state of straddling the ratchet claw body spring in the concave groove of the housing body, so that the restraining piece becomes the ratchet claw body and the ratchet teeth. The engagement state is forcibly maintained to prevent the ratchet pawl body from swinging. Therefore, even if the plunger is spring-biased from the housing body and tries to jump out, the popping out is completely restrained.
[0012]
Also, when releasing the restrained state of the plunger, the housing body without the damage of the ratchet pawl body spring by pulling up the knob piece by hand etc. and the stop piece constructed integrally with this knob piece By pulling out from the inside of the concave groove, it is possible to freely move the plunger which is spring-biased from the housing body and tries to protrude forward.
That is, when the torsion torque absorbing portion for absorbing the torsion torque of the knob piece is formed at least between the knob piece and the stop piece, the plunger stop tool is pulled out to twist. However, since the torsional torque absorbing portion formed between the knob piece and the restraining piece can absorb such twist and block the propagation to the restraining piece, the bifurcated restraining piece can be used as a ratchet claw. It is pulled up smoothly from the vicinity of the body spring.
Also, the inner crotch spacing of the stop piece is larger than the outer diameter of the ratchet pawl spring, and when the stop piece is inserted into the groove, the stop piece straddles the ratchet pawl spring. , It does not become an obstacle for insertion.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment as an embodiment of the present invention will be described with reference to FIGS.
First, as shown in FIG. 1, a ratchet tensioner 20 to which the resin plunger restrainer 10 of the present invention is applied as a temporary restraining means for the plunger 23 is a housing body 22 attached to a vehicle engine block (not shown). Inside, a plunger 23 that is spring-biased from the housing body 22 and protrudes outward, and a ratchet that is disposed in a concave groove 22A of the housing body 22 that opens toward the plunger 23 and swings in a pivotally supported state. A claw body 24 and a ratchet claw body spring 25 that urges the ratchet claw body 24 so as to engage with the ratchet teeth 23A on the outer peripheral surface of the plunger. Appropriate tension is applied.
In addition, 22B in FIG. 1 is an attachment hole for attaching the housing main body 22 to an engine.
Further, since the basic tensioner function of the ratchet type tensioner 20 is the same as that of the conventional ratchet type tensioner 41 described above, the detailed structure, operation, function, and the like are not described.
[0014]
Accordingly, the resin plunger stopper 10 according to an embodiment of the present invention is used for temporarily stopping the protrusion of the plunger 23 in the ratchet type tensioner 20 as described above, and will be described in detail below. To do.
The resin plunger stopper 10 of this embodiment is sandwiched between the housing body 22 and the ratchet pawl 24 in a state of straddling the ratchet pawl spring 25 in the concave groove 22 </ b> A of the ratchet tensioner 20. The bifurcated restraining piece 11 to be inserted in this manner and the knob piece 12 extending from the restraining piece 11 and projecting to the outside of the housing body 22 are integrally formed.
[0015]
Further, as shown in FIG. 2, the resin plunger restraint 10 of the present embodiment has a bifurcated restraining piece because the outer crotch interval W1 of the restraining piece 11 is larger than the groove width W2 of the recessed groove 22A. 11 is inserted between the housing main body 22 and the ratchet pawl 24 with the outer crotch interval W1 being compressed, and the spring-biased plunger is pushed back to generate between the housing main body 22 and the ratchet pawl 24 Even if the clamping force of the restraining piece 11 is eliminated, a widening force in the groove width direction acts between the inserted restraining piece 11 and the recessed groove 22A, so that the restraining piece 11 can be moved from within the recessed groove 22A of the housing body 22. Unless it is intentionally extracted, it is possible to completely prevent the stop piece 11 from falling off.
[0016]
On the other hand, the inner crotch interval of the stop piece 11 is larger than the outer diameter of the ratchet pawl body spring 25. When the stop piece 11 is inserted into the concave groove 22A, the stop piece 11 is moved to the ratchet pawl body spring 25. It is in a state where it straddles and does not become an obstacle to insertion.
3 indicates the outline of the concave groove 22A in the housing main body 22.
Moreover, as for the material of the plunger stopper 10, it is more preferable to adopt a synthetic resin such as a polyamide resin or a polyacetal resin from the viewpoint of molding burden, molding cost, and the like.
[0017]
The resin plunger restraint 10 of this embodiment is most characterized by a torsion torque absorbing portion 13 that absorbs the torsion torque of the knob piece 12 generated when the knob piece 12 is pulled out to be twisted. Is formed between the knob piece 12 and the restraining piece 11, and when the knob piece 12 is pulled out to be twisted, the torsion torque absorbing portion 13 absorbs such torsion torque. Propagation to the stop piece 11 is interrupted, and the inserted stop piece 11 can be smoothly pulled up from the vicinity of the ratchet pawl spring 25.
[0018]
In this way, when temporarily stopping the pop-out of the plunger 23 in the ratchet tensioner 20, the bifurcated restraining piece 11 extending from the picking piece 12 while grasping the picking piece 12 by hand or the like. Is inserted between the housing main body 22 and the ratchet claw body 24 in a state of straddling the ratchet claw body spring 25 in the concave groove 22A of the housing main body 22, whereby the stop piece 11 is Since the engagement state between the ratchet pawl body 24 and the ratchet teeth 23A is forcibly maintained to prevent the ratchet pawl body 24 from swinging, even if the plunger 23 is spring-biased from the housing body 22, The pop-out can be completely stopped. On the other hand, when releasing the stopped state of the plunger 23, the knob 12 is pulled by twisting by hand. Even if the restraining piece 11 is pulled up and pulled out from the recessed groove 22A of the housing main body 22, the torsion torque absorbing portion 13 absorbs such twisting torque and blocks the propagation to the restraining piece 11, so that the restraining piece 11 is ratchet. There is no fear that the ratchet mechanism is in trouble when the nail body spring 25 is twisted, and the nail body spring 25 is smoothly pulled up from the vicinity of the ratchet nail body spring 25.
[0019]
The resin plunger stopper 10 of the present embodiment obtained as described above is used for drilling for inserting the stopper pin 39 into the housing main body 32 and forcing the ratchet pawl 34 to swing. Therefore, it is possible to easily prevent the plunger 23 from popping out without requiring a processing step for fixing the outer plate 37 to the shaft 34, and to prevent the plunger 23 from being stopped. Since the restraining piece 11 can be pulled up smoothly from the vicinity of the ratchet pawl spring 25 when releasing, the ratchet mechanism comprising the ratchet pawl spring 25 and the like for the tensioner attaching operation, the chain attaching operation, and the removing operation to the engine block. Can be achieved easily without damaging the tensioner itself, Etc. can be greatly reduced granulation burden and manufacturing costs, the effect is significant.
[0020]
Next, FIGS. 3 to 12 show modifications of the resin plunger stopper 10 of this embodiment.
That is, the resin plunger stopper 10 shown in FIGS. 3 to 4 is obtained by changing the shape of the knob 12.
The resin plunger stopper 10 shown in FIGS. 5 to 7 is obtained by changing the shape of the torsion torque absorbing portion 13.
The resin plunger restraint 10 shown in FIG. 8 to FIG. 12 is pulled out so that the knob piece 12 is twisted from the inserted state by configuring the knob piece 12 with a linear body similarly to the torsion torque absorbing portion 13. Even in such a case, twisting torque is not generated as much as possible in the knob 12 itself.
[0021]
In addition, about the specific form of the torsion torque absorption site | part 13 mentioned above, it has a rigidity smaller than the rigidity resulting from the form of the knob piece 12 or the stop piece 11, and the knob piece 12 to the stop piece 11 has it. Any configuration other than that shown in FIGS. 1 to 12 can be used as long as it is a configuration capable of greatly suppressing torsional torque transmission.
[0022]
In the embodiment as described above, the case where the ratchet type tensioner 20 is applied to the hydraulic type tensioner 20 has been described. However, the plunger stopper 10 of the present invention is a no-back type ratchet type tensioner having no backlash. The present invention can also be applied.
[0023]
【The invention's effect】
As described above, the resin plunger restraint of the ratchet tensioner according to the present invention is for the ratchet pawl body in the concave groove formed in the housing body with an inner crotch interval larger than the outer diameter of the ratchet pawl spring . A bifurcated restraining piece inserted so as to be sandwiched between the housing body and the ratchet pawl in a state straddling the spring, and a knob piece extending from the restraining piece and projecting to the outside of the housing body By providing it, when trying to stop the plunger from popping out, the stop piece straddles the ratchet pawl spring, so that the stop piece does not hinder insertion and the stop piece extending from the knob piece is the ratchet pawl body. And the ratchet teeth are forcibly maintained to prevent the ratchet pawl body from swinging, so that the plunger can be completely prevented from popping out. When releasing the stop state, since it is possible to withdrawn stop piece pulling up the knob piece like manually from the groove of the housing body to allow free movement of the plunger, the tensioner mounting on the engine block Work, chain attachment, removal work, etc. can be easily achieved, and a punching process and a shaft 34 are required to fix the plunger pop-out restraining means comprising the external plate 37 to the housing body 32 as in the prior art. As a result, the manufacturing burden and manufacturing cost of the tensioner itself can be greatly reduced.
[0024]
Further, since the stop piece extending from the knob piece is inserted into the concave groove of the housing body, there is little gap between the housing body 32 and the engine block side as in the prior art, and the stopper pin 39 is located on the engine block side. Even in a tensioner installation environment where it is difficult to insert and remove the stopper pin 39 due to contact interference, the restraining piece can be easily inserted and removed, so that the tensioner can be easily attached to the engine block or the chain can be removed. .
[0025]
And when the torsion torque absorbing portion that absorbs the torsion torque of the knob is formed at least between the knob and the restraining piece, the knob is pulled out from the inserted state to be twisted. Even if there is, the torsion torque absorbing portion formed between the knob piece and the stop piece can absorb such twist and block the propagation to the bifurcated stop piece. The inserted stop piece can be pulled up smoothly from the vicinity of the ratchet pawl spring without causing the ratchet mechanism to malfunction due to the clamping state where the pawl spring is twisted. The drawing operation can be easily achieved.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a usage mode of a resin plunger restrainer of a ratchet type tensioner according to the present invention.
FIG. 2 is an enlarged view of a resin plunger stopper according to the present invention.
FIG. 3 is a view showing a first modified example of the resin plunger stopper according to the present invention.
FIG. 4 is a view showing a second modification of the resin plunger stopper according to the present invention.
FIG. 5 is a view showing a third modification of the resin plunger stopper according to the present invention.
FIG. 6 is a view showing a fourth modification of the resin plunger stopper according to the present invention.
FIG. 7 is a view showing a fifth modification of the resin plunger stopper according to the present invention.
FIG. 8 is a view showing a sixth modification of the resin plunger stopper according to the present invention.
FIG. 9 is a view showing a seventh modification of the resin plunger stopper according to the present invention.
FIG. 10 is a view showing an eighth modification of the resin plunger stopper according to the present invention.
FIG. 11 is a view showing a ninth modification of the resin plunger stopper according to the present invention.
FIG. 12 is a view showing a tenth modification of the resin plunger stopper according to the present invention.
FIG. 13 is a perspective view showing a ratchet type tensioner as a first conventional example.
FIG. 14 is a plan view showing a ratchet type tensioner as a second conventional example.
15 is a side sectional view of the ratchet tensioner shown in FIG.
FIG. 16 is a perspective view showing a ratchet type tensioner as a third conventional example.
17 is a side sectional view of the ratchet tensioner shown in FIG. 16. FIG.
18 is an enlarged view of a main part showing a pulled-out state of the plunger stopper in the ratchet tensioner of FIG.
[Explanation of symbols]
10: Plunger restraining tool 11: Stopping piece 12 ... Picking piece 13 ... Torsional torque absorbing part 20 ... Ratchet tensioner 22 ... Housing body 22A ... Concave groove 22B・ Mounting hole 23 ・ ・ ・ Plunger 23A ・ ・ ・ Ratchet tooth 24 ・ ・ ・ Ratchet claw body 25 ・ ・ ・ Ratchet claw body spring 37 ・ ・ ・ External plate 39 ・ ・ ・ Stopper pin

Claims (1)

In a housing body attached to an engine block for a vehicle, a plunger that is spring-biased from the housing body and protrudes forward is provided in a recessed groove of the housing body that opens toward the plunger. Using a ratchet tensioner composed of a swinging ratchet pawl and a ratchet pawl spring that urges the ratchet pawl so as to engage with the ratchet teeth on the outer peripheral surface of the plunger, the plunger pops out temporarily. In order to stop the ratchet pawl body between the housing main body and the ratchet pawl body with an inner crotch interval larger than the outer diameter of the ratchet pawl body spring and straddling the ratchet pawl body spring in the concave groove Resin-made plastic provided with a bifurcated restraining piece to be inserted so as to be sandwiched and a knob piece protruding from the restraining piece to the outside of the housing body In Ja restraint device,
A resin plunger restrainer for a ratchet tensioner, wherein at least a torsion torque absorbing portion for absorbing torsion torque generated in the knob piece is formed between the knob piece and the stop piece.

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