WO2016021739A1

WO2016021739A1 - Tensioner

Info

Publication number: WO2016021739A1
Application number: PCT/JP2015/072672
Authority: WO
Inventors: 貴雄小林; 和人平岡
Original assignee: 日本発條株式会社
Priority date: 2014-08-08
Filing date: 2015-08-10
Publication date: 2016-02-11
Also published as: JP6474413B2; JPWO2016021739A1

Abstract

This tensioner (10) is provided with: a shaft part (32) in which recesses (32D) to be engaged are formed along the axial direction; and a slide (34) which surrounds a portion of the shaft part (32) while the shaft part (32) is in a state of being loosely inserted therein, and which is moved along the shaft part (32) towards one side in the axial direction by the impelling force from a coil spring (36). Tips (38) provided with engagement protrusions (38E) for engaging with the recesses (32D) to be engaged of the shaft part (32) are provided between the shaft part (32) and the slide (34). When the slide (34) is moved towards the one side, the tips (38) are moved towards the one side in conjunction with the slide (34). Furthermore, the engagement protrusions (38E) of the tips (38) engage with the recesses (32D) to be engaged, and, as a result, movement of the slide (34) towards the other side in the axial direction is restricted.

Description

Tensioner

The present invention relates to a tensioner used for maintaining the tension of a chain or a belt.

Japanese Patent No. 5157013, Japanese Patent No. 3717473, and Japanese Patent No. 3833795 disclose tensioners that maintain the tension of the timing chain and the timing belt by pressing the timing belt and the timing chain.

The tensioner described in Japanese Patent No. 5157013 includes a cylindrical member formed in a bottomed cylindrical shape, a solid shaft member inserted into the cylindrical member, and a case that supports the cylindrical member and the shaft member. And. As the cylindrical member and the shaft member extend toward the case by the urging force of the propulsion spring and the holder spring, the tip of the cylindrical member presses the timing belt or the timing chain (presses via a chain guide or the like). It has become. Also, due to the expansion of the engine case that forms part of the engine, the shaft between the crankshaft and the camshaft may change, causing an overload from the timing belt or timing chain to the tensioner. In the tensioner described in the above, the overload is suppressed from being applied to the tensioner by compressing the holder spring and moving the shaft member backward.

The tensioner described in Japanese Patent No. 3717473 includes a cylindrical plunger, a housing body into which the cylindrical plunger is inserted, and a wedge-shaped cam tip and a cam receiving ring that hold the protruding state of the cylindrical plunger with respect to the housing body. It consists of The columnar plunger extends toward the housing body by the biasing force of the projecting biasing spring, so that the tip of the columnar plunger presses the timing belt or the timing chain. Further, in the tensioner described in this document, the cam receiving ring biasing spring is compressed, and the cylindrical plunger moves backward together with the wedge-shaped cam tip and the cam receiving ring, so that the overload is prevented from being applied to the tensioner. ing.

The tensioner described in Japanese Patent No. 3837595 includes a pair of shaft members, a torsion spring that urges one shaft around its axis, and a case that accommodates one shaft, the torsion spring, and the like. And a bearing that supports the other shaft. When one shaft is rotated by the torsion spring and the other shaft extends toward the case, a cap attached to the tip of the other shaft presses the timing belt or the timing chain.

However, the tensioners described in Japanese Patent No. 5157013, Japanese Patent No. 3717473, and Japanese Patent No. 3837595 may be affected by the lubrication / lubrication properties depending on the difference in the tensioner mounting position depending on the engine structure / vehicle type. . As a result, a sensory phenomenon in which the feeling of the engine changes slightly may occur.

The object of the present invention is to obtain a tensioner that can ensure lubricity between components in consideration of the above facts.

The tensioner of the first aspect surrounds a part of the shaft part in a state in which the engaged part is formed along the axial direction and the shaft part is loosely inserted. A propulsion portion that is moved to one axial direction along the shaft portion by the urging force, and an engagement that is disposed between the shaft portion and the propulsion portion and engages with the engaged portion. The propulsion unit is moved to the one side together with the propulsion unit when the propulsion unit is moved to the one side, and the engagement portion engages with the engaged portion, thereby the propulsion unit And a stopper portion that restricts movement toward the other side in the axial direction.

According to the tensioner of the first aspect, the propulsion part is moved to one side with respect to the shaft part by the urging force of the urging member, so that the tip side of the propulsion part is moved to the belt or chain (belt guide or chain guide Etc.). As a result, the tension of the belt or chain is maintained. When the belt or chain presses the propulsion portion while the belt or chain tension is maintained, the engaging portion of the stopper portion is engaged with the engaged portion of the shaft portion. Thereby, the movement to the other side of a propulsion part is controlled.

Here, in this tensioner, when the shaft portion is loosely inserted into the propulsion portion, the propulsion portion surrounds a part of the shaft portion. Thereby, the oil in the engine case is easily adhered between the shaft portion and the propulsion portion, and the lubricity between the shaft portion and the propulsion portion is ensured. Further, the oil that has entered between the shaft portion and the propulsion portion ensures lubricity between the engaging portion of the stopper portion and the engaged portion of the shaft portion.

The tensioner according to the second aspect is the tensioner according to the first aspect, wherein the contact surface between the propulsion unit and the stopper portion is inclined with respect to the axial direction.

According to the tensioner of the second aspect, since the contact surface between the propulsion unit and the stopper portion is inclined with respect to the axial direction of the shaft portion, when the belt or the chain presses the propulsion portion, the propulsion portion and the stopper portion Is in sliding contact. Therefore, it is possible to provide hysteresis to the drag force of the tensioner when an instantaneous load due to fluctuations in the rotational speed of the crankshaft is input from the belt or chain to the propulsion unit. That is, the instantaneous load energy input to the tensioner can be attenuated. Thereby, the level of the hitting sound when an instantaneous load is input from the belt or chain to the propulsion unit can be reduced.

The tensioner according to the third aspect is the tensioner according to the first aspect or the second aspect, wherein at least one of a hole and a slit through which oil passes is formed in at least one of the shaft portion and the propulsion portion.

According to the tensioner of the third aspect, oil can be introduced to a desired position of the tensioner through the holes and slits formed in the shaft part and the propulsion part.

The tensioner according to a fourth aspect is the tensioner according to any one of the first aspect to the third aspect, wherein the urging member is disposed inside the shaft portion.

According to the tensioner of the fourth aspect, the tensioner can be miniaturized by adopting the above arrangement of the biasing member.

The tensioner according to a fifth aspect is the tensioner according to any one of the first to fourth aspects, wherein the propulsion unit is movable by a predetermined distance in a direction perpendicular to the axial direction with respect to the shaft portion. Has been.

According to the tensioner of the fifth aspect, the propulsion unit rattles (moves) the belt or chain (belt guide, chain guide, etc.) in the direction perpendicular to the axial direction with respect to the shaft portion. Can be absorbed.

The tensioner according to the present invention has an excellent effect that the lubricity between components can be ensured.

It is a perspective view which shows the tensioner which concerns on 1st Embodiment. It is a side view which shows the tensioner which concerns on 1st Embodiment. It is a rear view which shows the tensioner which concerns on 1st Embodiment. It is a front view which shows the tensioner which concerns on 1st Embodiment. FIG. 5 is a side sectional view showing a section of the tensioner cut along line 5-5 shown in FIG. 3; It is a fragmentary sectional view showing the engine with which the tensioner concerning a 1st embodiment was attached. It is a side view which shows a shaft part. It is a rear view which shows a shaft part. It is a front view which shows a shaft part. FIG. 7B is a side sectional view showing a section of the shaft section taken along line 7D-7D shown in FIG. 7B. It is a front view which shows a flange. It is a fragmentary sectional side view which shows a flange. It is a top view which shows a slide. It is a rear view which shows a slide. It is a front view which shows a slide. FIG. 9C is a side sectional view showing a section of the slide cut along line 9D-9D shown in FIG. 9C. It is a side view which shows a cap. It is a top view which shows a cap. It is a rear view which shows a cap. It is a front view which shows a chip | tip. It is a rear view which shows a chip | tip. It is a bottom view which shows a chip | tip. FIG. 11B is a side sectional view showing a cross section of the chip taken along line 11D-11D shown in FIG. 11B. It is a side view which shows a leaf | plate spring. It is a front view which shows a leaf | plate spring. It is a rear view which shows a leaf | plate spring. It is a side view which shows a shaft part. It is a rear view which shows a shaft part. It is a front view which shows a shaft part. FIG. 13C is a side cross-sectional view showing a cross section of the shaft section taken along line 13D-13D shown in FIG. 13B. It is a graph which shows the relationship between the displacement of a tensioner when a momentary load is input into a slide, and a drag. It is a perspective view which shows the tensioner formed using the slide made from casting. It is a sectional side view corresponding to FIG. 9D which shows the slide of another form. It is a perspective view corresponding to Drawing 1 showing the tensioner concerning a 2nd embodiment. It is a perspective view which shows the leaf | plate spring of another form. It is a side view which shows the leaf | plate spring of another form. It is the side view which looked at the leaf spring of other forms from the direction different from Drawing 18A.

A tensioner according to an embodiment of the present invention will be described with reference to FIGS. 1 to 12C.

As shown in FIG. 6, the tensioner 10 of this embodiment is used to maintain the tension of the timing chain 14 that constitutes a part of the engine 12. Here, the configuration of the engine 12 will be briefly described. The engine 12 is, for example, a DOHC gasoline engine. The engine 12 includes a crankshaft 16 and a camshaft 18 for opening and closing a valve (not shown). , 20. The crankshaft 16 is formed with a sprocket portion 16A corresponding to the pitch of the timing chain 14, and the

camshafts

18 and 20 are attached with

sprockets

22 and 24 corresponding to the pitch of the timing chain 14. ing. The rotation of the crankshaft 16 is transmitted to the

sprockets

22 and 24 through the timing chain 14 so that the

camshafts

18 and 20 are driven. The engine 12 includes a chain guide 26 for guiding the timing chain 14. The tensioner 10 presses the timing chain 14 via the chain guide 26 so that the tension of the timing chain 14 is maintained.

(Detailed configuration of tensioner 10)
As shown in FIGS. 1 to 5, the tensioner 10 includes a shaft portion 32 that is fixed to a cylinder block 28 (see FIG. 6) of the engine 12 via a flange 30, and a timing chain 14 ( And a slide 34 as a propulsion unit that can be moved to the side. The tensioner 10 includes a coil spring 36 as a biasing member that biases the slide 34 toward the timing chain 14, and a pair of stoppers that restrict movement of the slide 34 to the side away from the timing chain 14. Chip 38.

(Configuration of shaft portion 32)
As shown in FIGS. 7A to 7D, the shaft portion 32 is formed by pressing a steel plate material having a predetermined shape, and the shaft portion 32 is formed in the axial direction of the shaft portion 32 ( Hereinafter, it is formed in a rectangular bottomed cylindrical shape that simply extends in the “axial direction”. Specifically, the shaft portion 32 includes a bottom wall portion 32A formed in a rectangular shape whose axial direction (arrow A1 and arrow A2 directions) is the plate thickness direction. The bottom wall 32A is formed with a circular caulking hole 32B into which a caulking protrusion 30A (see FIG. 8B) formed on the flange 30 to be described in detail is inserted.

Further, the shaft portion 32 extends from one end and the other end of the bottom wall portion 32A by bending to one side in the axial direction (arrow A1 direction) and a pair of first side wall portions disposed in parallel to each other. 32C is provided. The first side wall portion 32C is formed in a rectangular shape whose longitudinal direction is the axial direction, and a plurality of engaged recesses 32D as engaged portions are formed in the first side wall portion 32C by press working. Has been. The plurality of engaged recesses 32D are arranged along the axial direction at a predetermined pitch, and in the present embodiment, the plurality of engaged recesses 32D formed on one first side wall portion 32C and The plurality of recessed portions 32D to be engaged formed on the other first side wall portion 32C are arranged in a state shifted by a half pitch in the axial direction.

Further, the shaft portion 32 includes a second side wall portion 32E extending from both ends in the short direction of the first side wall portion 32C toward the other first side wall portion 32C. Further, the second side wall part 32E extending from one first side wall part 32C and the second side wall part 32E extending from the other first side wall part 32C are separated from each other, whereby the first side wall part 32C extending from the first first side wall part 32C. Between the two side wall portions 32E and the second side wall portion 32E extending from the other first side wall portion 32C, it is possible to introduce oil in the engine 12 (see FIG. 6) into the shaft portion 32. 32F is formed. Furthermore, the guide piece 32G formed in the shape of a tongue piece is provided in the edge part of the axial direction one side of the 2nd side wall part 32E.

Further, as shown in FIG. 5, a coil spring 36 is disposed inside the shaft portion 32, and the coil spring 36 can extend and contract along the axial direction.

(Configuration of flange 30)
As shown in FIGS. 8A and 8B, the flange 30 is formed by pressing a steel plate material thicker than the shaft portion 32, and the flange 30 has a bottom of the shaft portion 32. A caulking protrusion 30A to be inserted into a caulking hole 32B (see FIG. 7B) formed in the wall 32A is formed. As shown in FIG. 5, the shaft portion 32 is fixed to the flange 30 by caulking the caulking projection portion 30 A.

Further, the flange 30 is formed with a bolt insertion hole 30B into which the bolt 40 (see FIG. 6) is inserted and a rotation member insertion hole 30C into which a rotation member 46A (see FIG. 3) described later is inserted. As shown in FIG. 6, the bolt 40 inserted into the bolt insertion hole 30B is screwed into the cylinder block 28, whereby the flange 30 is fixed to the cylinder block 28. That is, the tensioner 10 is a cylinder. It is fixed to the block 28.

(Configuration of slide 34)
As shown in FIGS. 9A to 9D, the slide 34 is formed by pressing a steel plate material having a predetermined shape. In the present embodiment, the slide 34 is formed using a steel plate having the same thickness as the shaft portion 32. Specifically, the slide 34 is formed in a box shape in which a portion on the other side in the axial direction (arrow A2 direction) of the slide 34 is narrowed toward one side in the axial direction (arrow A1 direction). 34 includes a bottom wall portion 34A formed in a rectangular shape whose axial direction is the plate thickness direction. The bottom wall portion 34A is formed with a rectangular shaft portion insertion hole 34B into which the shaft portion 32 is inserted (freely inserted) with a clearance.

Further, the slide 34 includes a pair of inclined wall portions 34C that bend and extend from one end and the other end of the bottom wall portion 34A to one side in the axial direction. The distance L between the one inclined wall portion 34C and the other inclined wall portion 34C is set so as to gradually decrease toward the one side in the axial direction.

Further, the slide 34 extends from one end in the axial direction of the one inclined wall 34C and the other inclined wall 34C by bending in the one axial direction and is disposed in parallel with each other. A side wall 34D is provided. The first side wall portion 34D is formed in a rectangular shape whose longitudinal direction is the axial direction. Further, the slide 34 includes a second side wall portion 34E that extends from both lateral ends of the first side wall portion 34D toward the other first side wall portion 34D. The first side wall portion 32C and the second side wall portion 32E of the shaft portion 32 are inserted (freely inserted) into the space surrounded by the first side wall portion 34D and the second side wall portion 34E. Further, when the shaft portion 32 is inserted (freely inserted) into the space surrounded by the shaft portion insertion hole 34B, the first side wall portion 34D, and the second side wall portion 34E, the slide 34 becomes one of the shaft portions 32. The slide 34 can move along the shaft portion 32 while surrounding the portion.

Further, the second side wall 34E extending from one first side wall 34D and the second side wall 34E extending from the other first side wall 34D are separated from each other, so that the second side wall 34E extending from the first first side wall 34D is separated. Between the second side wall portion 34E and the second side wall portion 34E extending from the other first side wall portion 34D, a guide slit 34F in which the guide piece 32G (see FIG. 7C) of the shaft portion 32 is disposed is formed. Further, a restricting portion 34G is provided at the other side in the axial direction of the second side wall portion 34E, and as shown in FIG. 2, the guide piece 32G of the shaft portion 32 abuts on the restricting portion 34G. The moving distance to one side in the axial direction with respect to the shaft portion 32 of the slide 34 is limited. The oil in the engine 12 (see FIG. 6) can be introduced to the shaft portion 32 side through the guide slit 34F.

A locking hole 34H for locking a locking portion 42C (see FIG. 10A) of the cap 42 described later is formed at one end in the axial direction of the first side wall portion 34D and the second side wall portion 34E. ing.

(Cap 42)
As shown in FIGS. 10A to 10C, the cap 42 is formed by pressing a steel plate material having a predetermined shape, and this cap 42 is in the axial direction (in the directions of arrows A1 and A2). The top wall portion 42A is formed in a rectangular shape with the plate thickness direction.

Further, the cap 42 includes a locking portion 42C that extends from the end portion of the top wall portion 42A and is bent in a substantially U shape in a side view. As shown in FIG. 5, the cap 42 is attached to the slide 34 by locking the locking portion 42 C in a locking hole 34 H provided in the slide 34. The coil spring 36 is in contact with the end surface on the other side in the axial direction of the top wall portion 42A. As a result, the urging force of the coil spring 36 is transmitted to the slide 34 via the cap 42, and the slide 34 moves to one side in the axial direction along the shaft portion 32.

(Chip 38)
As shown in FIGS. 11A to 11D, the tip 38 is formed in a block shape by casting or the like as an example, and as shown in FIG. The wall portion 34 A and the shaft portion 32 are disposed in a space surrounded by the first side wall portion 32 C. Specifically, as shown in FIGS. 11A to 11D, the tip 38 has a triangular prism-shaped inclined wall in which the inclination angle θ with respect to the axial direction is substantially the same as the inclination angle θ of the inclined wall portion 34C of the slide 34. A portion 38A, and a side wall portion 38B extending from both longitudinal ends of the inclined wall portion 38A toward the first side wall portion 32C side of the shaft portion 32. Further, a plurality of engaging portions that can be engaged with an engaged recess 32D formed in the first side wall portion 32C of the shaft portion 32 are provided in the middle portion in the longitudinal direction of the inclined wall portion 38A. An engaging convex portion 38E is formed. The pitch of the plurality of engaging convex portions 38E is a pitch corresponding to the plurality of engaged concave portions 32D.

As shown in FIG. 5, the chip 38 described above is disposed in a space surrounded by the inclined wall portion 34 C, the bottom wall portion 34 A of the slide 34 and the first side wall portion 32 C of the shaft portion 32. When the slide 34 moves to the axial direction one side (arrow A1 direction) with respect to the shaft portion 32, the slide 34 is inclined so that the tip 38 can move in a direction away from the shaft portion 32. The dimensions of the space surrounded by the wall portion 34C, the bottom wall portion 34A, and the first side wall portion 32C of the shaft portion 32 are set. Further, when the slide 34 moves to the other side in the axial direction (arrow A2 direction) with respect to the shaft portion 32, the inclined wall portion 38A of the tip 38 and the inclined wall portion 34C of the slide 34 come into contact with each other, so Move toward the 32 side. Then, the engaging convex portion 38 E formed on the tip 38 is engaged with the engaged concave portion 32 D formed on the shaft portion 32. Thereby, the movement to the other side of the axial direction of the slide 34 is controlled. Note that the chip 38 may be integrally formed with a sheet metal processed product in which unevenness is provided on one strip-shaped plate material.

(Configuration of leaf spring 44)
As shown in FIGS. 12A to 12C, the plate spring 44 is formed by pressing a steel plate material or the like, and the plate spring 44 is formed in the axial direction (the directions of the arrows A1 and A2). A curved spring portion 44A is provided. The spring portion 44A is formed in a rectangular frame shape by having a pair of first extending portions 44A1 and a pair of second extending portions 44A2 arranged in parallel to each other. Moreover, in this embodiment, the intermediate part of the longitudinal direction of a pair of 1st extension part 44A1 is curving convexly in the axial direction other side (arrow A2 direction). Further, a rectangular shaft portion insertion hole 44B into which the shaft portion 32 is inserted (freely inserted) is formed in the spring portion 44A. Further, as shown in FIG. 5, the tip 38 is biased toward one side in the axial direction by the spring portion 44 A, whereby the inclined wall portion 34 C, the bottom wall portion 34 A, and the shaft portion 32 of the slide 34. The rattling of the chip 38 in the space surrounded by the first side wall portion 32C is suppressed.

(Configuration of stopper mechanism 46)
As shown in FIGS. 3 and 4, in the present embodiment, a stopper mechanism 46 that is used when the tensioner 10 is assembled to the engine 12 is provided. The stopper mechanism 46 includes a rotating member 46A inserted into a rotating member insertion hole 30C (see FIG. 8A) formed in the flange 30, and a rotating piece 46B that rotates together with the rotating member 46A. It is configured. As shown in FIG. 4, the rotation piece 46 B is locked to the bottom wall portion 34 A of the slide 34, so that the movement of the slide 34 in one axial direction is restricted. Further, with the tensioner 10 fixed to the engine 12 (see FIG. 6) (with the flange 30 fixed to the cylinder block 28 (see FIG. 6)), the rotating member 46A shown in FIG. When moved, the rotating piece 46B shown in FIG. 4 is disengaged from the bottom wall portion 34A of the slide 34, and the slide 34 moves to one side in the axial direction. The tension of the timing chain 14 (see FIG. 6) is maintained by pressing the chain guide 26 (see FIG. 6) by the cap 42 attached to the tip of the slide 34 moved to one side in the axial direction. It has become.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

According to the tensioner 10 described above, as shown in FIG. 5, the slide 34 is attached to the distal end side of the slide 34 by being moved to one side with respect to the shaft portion 32 by the biasing force of the coil spring 36. The cap 42 can be pressed against the chain guide 26 (see FIG. 6). Thereby, the tension of the timing chain 14 (see FIG. 6) is maintained. Further, when the chain guide 26 presses the cap 42 attached to the distal end side of the slide 34 due to the timing chain 14 swinging in a state where the tension of the timing chain 14 is maintained, the engagement convex portion 38E of the chip 38 is pressed. Is engaged with the engaged recess 32D of the shaft portion 32. Thereby, the movement of the slide 34 to the other side in the axial direction is restricted.

Here, in the tensioner 10 of the present embodiment, when the shaft portion 32 is inserted (freely inserted) into the slide 34, the slide 34 surrounds a part of the shaft portion 32. As a result, oil in the engine 12 (see FIG. 6) easily adheres between the shaft portion 32 and the slide 34, and lubricity between the shaft portion 32 and the slide 34 is ensured. In addition, the oil that has entered between the shaft portion 32 and the slide 34 ensures lubricity between the engaging convex portion 38E of the tip 38 and the engaged concave portion 32D of the shaft portion 32. That is, in the tensioner 10 according to the present embodiment, the lubricity between the components constituting the tensioner 10 can be improved.

Also, in the tensioner 10 of the present embodiment, the slide 34 and the shaft portion 32 are formed by pressing a steel plate material that is a plate-like member. Therefore, the manufacturing cost of the slide 34 and the shaft portion 32 can be reduced as compared with the case where the slide 34 and the shaft portion 32 are formed by cutting a solid member. As a result, the manufacturing cost of the tensioner 10 can be reduced.

Furthermore, in this embodiment, in addition to the slide 34 and the shaft portion 32, the chip 38 is formed by pressing, so that the manufacturing cost of the tensioner 10 is further reduced. Further, by forming the engaging convex portion 38E of the tip 38 and the engaged concave portion 32D of the shaft portion 32 by pressing, the manufacturing cost of the tensioner 10 can be further reduced.

Further, according to the tensioner 10 of the present embodiment, the contact surface between the slide 34 and the tip 38 is inclined with respect to the axial direction of the shaft portion 32, that is, the inclined wall portion 34C of the slide 34 and the tip 38 are inclined. The wall portion 38A is inclined with respect to the axial direction. Therefore, when the slide 34 is pressed to the other side in the axial direction, the slide 34 and the tip 38 come into sliding contact. Therefore, it is possible to provide a hysteresis to the drag of the tensioner 10 when an instantaneous load due to fluctuations in the rotational speed of the crankshaft 16 is input from the timing chain 14 and the chain guide 26 to the slide 34. That is, the instantaneous load energy input to the tensioner 10 can be attenuated. Thereby, it is possible to reduce the level of hitting sound when an instantaneous load is input to the slide 34. FIG. 14 shows a graph in which the displacement and drag force of the tensioner 10 when the instantaneous load is input to the slide 34 are plotted. As shown in this figure, it can be seen that there is a difference (hysteresis) in the drag of the tensioner 10 between the region R1 where the drag of the tensioner 10 is increasing and the region R2 where the drag is decreasing. In this embodiment, in addition to the slit 32F being formed in the shaft portion 32, the guide slit 34F is formed in the slide 34. As a result, when the instantaneous load is input to the slide 32, the side portion (second side wall portion 32E) of the shaft portion 32 and the side portion (second side wall portion 34E) of the slide 34 are moved in the axial direction (arrow A1). And in the direction orthogonal to the direction of the arrow A2). In other words, when the instantaneous load is input to the slide 32, the shaft portion 32 and the slide 34 can be easily bent in the axial direction (arrow A1 and arrow A2 directions). Thereby, in this embodiment, the level of the hitting sound when an instantaneous load is input to the slide 34 can be further reduced.

Furthermore, in the tensioner 10 of the present embodiment, the slide 34 and the shaft portion 32 are formed by pressing the steel plate material, so that the slide 34 and the shaft portion are pressed when the slide 34 is pressed. 32 can be easily bent. More specifically, when an instantaneous load is input to the slide 34, the contact pressure at the contact portion between the tip 38 and the slide 34 increases. In other words, the inclined wall portion 34 C of the slide 34 is deformed in a direction away from the shaft portion 32 by a reaction in which the inclined wall portion 34 C of the slide 34 presses the inclined wall portion 38 A of the tip 38. Thereby, the level of the hitting sound when an instantaneous load is input to the slide 34 can be further reduced.

Further, even when the engagement convex portion 38E of the tip 38 is engaged with the engaged concave portion 32D of the shaft portion 32, the movement of the slide 34 to the other side in the axial direction is restricted, that is, the timing chain. Even in a situation where the tension of the belt 14 is likely to be high, the tension of the timing chain 14 can be suppressed from becoming excessive because the slide 34 and the shaft portion 32 are easily bent.

In the present embodiment, the reaction force caused by the tensioner 10 pressing the chain guide 26 (see FIG. 6) causes the cap 42, the first side wall portion 34D of the slide 34, the inclined wall portion 34C of the slide 34, and the tip 38 to move. Via the shaft 32. This makes it difficult for the reaction force to be transmitted to the bottom wall portion 34 A of the slide 34. Thus, by disposing the tip 38 along the bottom wall portion 34A where the reaction force is difficult to be transmitted, that is, the bottom wall portion 34A with little deformation due to the reaction force, the tip 38 is unintentionally deformed by the reaction force. Can be suppressed. Thereby, durability of the tensioner 10 can be improved. As shown in FIG. 16, by providing a burring portion 34I at the peripheral edge of the shaft portion insertion hole 34B formed in the bottom wall portion 34A, it is difficult to deform the bottom wall portion 34A and an optimum rigidity is set. It is also possible to do. Further, in the present embodiment, the chip 38 is disposed along the bottom wall portion 34A, but the present invention is not limited to this. For example, the space in which the chip 38 is disposed may be disposed on the side of the slide 34 where the cap 42 is attached.

Furthermore, according to the tensioner 10 of the present embodiment, oil can be introduced to a desired position of the tensioner 10 through the slit 32F formed in the shaft portion 32 and the guide slit 34F formed in the slide 34. Thereby, the lubricity mentioned above can be made more favorable. Instead of the slit 32F, holes through which oil can pass may be formed in the first side wall portion 32C and the second side wall portion 32E of the shaft portion 32, or the first side wall portion 34D and the second side wall portion 34D of the slide 34 may be formed. A hole through which oil can pass may be formed in the side wall portion 34E.

Further, in the present embodiment, the dimensions of each part of the slide 34 are such that the slide 34 rattles in a direction perpendicular to the axial direction (arrow A1 and arrow A2 directions) with respect to the shaft part 32 (movable by a predetermined distance). Is set. This absorbs the flutter of the chain guide 26 (see FIG. 6) when the slide 34 rattles (moves) in a direction perpendicular to the axial direction (arrow A1 and arrow A2 directions) with respect to the shaft portion 32. can do.

Further, according to the tensioner 10 of the present embodiment, the tensioner 10 can be reduced in size by arranging the coil spring 36 inside the shaft portion 32.

In the present embodiment, an example in which the shaft portion 32 and the slide 34 are formed by pressing a steel plate material has been described, but the present invention is not limited to this. For example, either the shaft portion 32 or the slide 34 can be formed by casting or the like. As an example, as shown in FIGS. 13A to 13D, a cast shaft portion 48 that does not include the guide slit 34F with respect to the above-described shaft portion 32 may be used. In the shaft portion 48, portions corresponding to the shaft portion 32 described above are denoted by the same reference numerals as those of the shaft portion 32. Further, as shown in FIG. 15, a castable slide 49 can also be used. Note that portions of the slide 49 corresponding to the slide 34 are denoted by the same reference numerals as the slide 34. Further, the chip 38 may be manufactured by another manufacturing method.

In the present embodiment, the example in which the coil spring 36 is disposed inside the shaft portion 32 has been described. However, the present invention is not limited to this, and for example, the biasing member having an inner diameter larger than the inner diameter of the coil spring 36. The coil spring can be arranged along the outer peripheral portion of the shaft portion 32.

Furthermore, in this embodiment, although the example which comprised the tensioner 10 using the axial part 32 formed in the prism shape was demonstrated, this invention is not limited to this. For example, like a tensioner 50 according to the second embodiment shown in FIG. 17, a shaft portion 32 formed in a cylindrical shape and a slide 34 corresponding to the cylindrical shaft portion 32 may be used. In the tensioner 50, members and portions having the same functions as those of the tensioner 10 described above are denoted by the same reference numerals as those of the tensioner 10.

Further, as shown in FIGS. 12A to 12C, in the present embodiment, the longitudinal intermediate portion of the pair of first extending portions 44A1 constituting a part of the spring portion 44A of the leaf spring 44 is the other side in the axial direction. Although the example which comprised the tensioner 10 using the leaf | plate spring 44 of the structure curved convexly (in arrow A2 direction) was demonstrated, this invention is not limited to this. For example, as shown in FIGS. 18A to 18C, a longitudinal intermediate portion (a portion that abuts against the bottom wall portion 34A of the slide 34) of the pair of first extending portions 44A1 constituting a part of the spring portion 44A. In addition to being curved in a convex shape on the other side in the axial direction (in the direction of arrow A2), an intermediate portion (tip 38) in the longitudinal direction of the pair of second extending portions 44A2 constituting the other part of the spring portion 44A It is also possible to use a leaf spring 44 having a configuration in which a portion that abuts on the side is curved in a convex shape on one side in the axial direction (in the direction of arrow A1). In this configuration, the amount of bending of the leaf spring 44 in the axial direction can be further increased. Further, the leaf spring 44 can easily swing in the direction of the arrow A3 with the first extending portion 44A1 as a fulcrum, so that the tip 38 can be moved more smoothly.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

Claims

A shaft portion in which an engaged portion is formed along the axial direction;
A propulsion part that surrounds a part of the shaft part in a state where the shaft part is inserted with a clearance, and is moved to one side in the axial direction along the shaft part by a biasing force from a biasing member. When,
An engaging portion that is disposed between the shaft portion and the propulsion portion and engages with the engaged portion, and when the propulsion portion is moved to the one side, the propulsion portion and the engagement portion A stopper portion that is moved to one side and restricts movement of the propulsion portion to the other side in the axial direction by engaging the engaged portion with the engaged portion;
Tensioner with
The tensioner according to claim 1, wherein a contact surface between the propulsion part and the stopper part is inclined with respect to the axial direction.
The tensioner according to claim 1 or 2, wherein at least one of a hole and a slit through which oil passes is formed in at least one of the shaft portion and the propulsion portion.
The tensioner according to claim 2, wherein the biasing member is disposed inside the shaft portion.
The tensioner according to any one of claims 1 to 4, wherein the propulsion unit is movable by a predetermined distance in a direction orthogonal to the axial direction with respect to the shaft portion.