JP7073887B2 - Tensioner mounting structure - Google Patents

Description

The present invention relates to a tensioner mounting structure.

Generally, in an internal combustion engine, a drive sprocket is fixed to a crankshaft, and a transmission chain is wound around the drive sprocket. Further, the cylinder block of the internal combustion engine is equipped with a chain guide for guiding the traveling of the transmission chain and a tensioner for adjusting the tension of the transmission chain by applying an urging force to the chain guide.

The tensioner of Patent Document 1 has a tensioner body having a substantially bottomed cylindrical shape. A bottomed cylindrical plunger is inserted into the accommodation hole, which is the internal space of the tensioner body. The plunger is inserted so that the opening side of the plunger faces the bottom side of the tensioner body. In addition, a compression spring that gives a biasing force to the plunger is accommodated in the accommodating hole of the tensioner body. The compression spring is located between the bottom of the accommodating hole in the tensioner body and the plunger.

In the tensioner of Patent Document 1, an oil supply hole communicates with the tensioner body from the outside of the tensioner to the inside of the accommodating hole in the tensioner body. Further, in the peripheral wall of the plunger, a plunger through hole penetrates from the outside of the plunger to the reserve chamber which is the internal space of the plunger. When oil is supplied to the oil supply hole as the internal combustion engine is driven, the oil flows into the reserve chamber of the plunger between the inner peripheral surface of the tensioner body and the outer peripheral surface of the plunger and through the through hole of the plunger. Will be supplied.

Japanese Unexamined Patent Publication No. 2016-89854

In the tensioner of Patent Document 1, the oil supply is stopped after the internal combustion engine is stopped. Then, the oil in the reserve chamber of the plunger gradually flows out of the tensioner through the space between the inner peripheral surface of the tensioner body and the outer peripheral surface of the plunger, and the oil in the reserve chamber of the plunger is reduced. If the oil in the reserve chamber of the plunger is excessively low, the plunger may not operate properly when the internal combustion engine is restarted.

In order to solve the above problems, the present invention is a tensioner mounting structure applied to an internal combustion engine including a guide member for guiding the traveling of the chain and a tensioner for applying an urging force to the guide member. A tensioner body having a columnar accommodating hole with one end open, a tubular plunger inserted into the accommodating hole so as to be slidable in the axial direction of the accommodating hole, and a plunger arranged inside the accommodating hole. The guide member includes an abutting member with which the tip of the plunger abuts, and the tensioner body has the tip of the plunger diagonally upward. It is fixed so as to be oriented, and a plunger through hole is penetrated from the outside to the inside of the plunger in the peripheral wall of the plunger, and the plunger through hole is the most in the vertical direction among the opening edges of the tensioner body. It is located below the horizontal plane at the same height as the location located below, and the tip of the plunger has a non-circular shape in a plan view from the axial direction of the plunger, and is attached to the contact member. Is provided with a fitting recess into which the tip of the plunger fits, and the inner wall surface of the fitting recess regulates the rotation of the plunger in the circumferential direction.

In the above configuration, the oil level existing between the inner peripheral surface of the tensioner body and the outer peripheral surface of the plunger is at the same height as the lowermost portion of the opening edge of the tensioner body. Can be reduced. Even if the oil level drops to this state, the plunger through hole is still located below the oil level, and air flows into the plunger reserve chamber through the plunger through hole. do not do. Therefore, it is difficult for the oil in the reserve chamber of the plunger to flow out to the outside, and it is possible to prevent the oil in the reserve chamber from becoming excessively low.

Schematic side view of an internal combustion engine. Sectional view of the tensioner with the plunger located at the bottom of the accommodation hole in the tensioner body. Sectional view of the tensioner with the plunger most protruding from the bottom of the accommodation hole in the tensioner body. Front view of the tensioner. The end view along the 5-5 line in FIG.

An embodiment of the tensioner mounting structure will be described with reference to FIGS. 1 to 5. In the following description, it is assumed that the internal combustion engine (tensioner) is mounted on the vehicle, and the vertical direction of the vehicle is described as the vertical direction of the internal combustion engine and the tensioner mounting structure.

As shown in FIG. 1, a drive sprocket 10 is fixed to the crankshaft of the internal combustion engine E. A transmission chain 20 is wound around the drive sprocket 10. The transmission chain 20 is wound around the intake side driven sprocket 11 and the exhaust side driven sprocket 12 in addition to the drive sprocket 10. The intake side driven sprocket 11 and the exhaust side driven sprocket 12 are arranged above the drive sprocket 10. Further, the intake side driven sprocket 11 and the exhaust side driven sprocket 12 are arranged side by side at substantially the same height position. The intake-side driven sprocket 11 is connected to a camshaft for opening and closing the intake valve, and the exhaust-side driven sprocket 12 is connected to a camshaft for opening and closing the exhaust valve. In FIG. 1, the drive sprocket 10, the intake side driven sprocket 11, and the exhaust side driven sprocket 12 are shown schematically in a circle.

A fixed guide member 30 that guides the traveling of the transmission chain 20 is fixed to the outer surface of the cylinder block CB in the internal combustion engine E. The fixed guide member 30 is located between the drive sprocket 10 and the exhaust side driven sprocket 12. The fixed guide member 30 is long and has a slightly curved shape (bow-shaped shape), and the outside of the curved shape faces the center side of the internal combustion engine E. The transmission chain 20 is in contact with the curved outer surface of the fixed guide member 30. The fixing guide member 30 is fixed to the cylinder block CB with bolts B on the upper side and the lower side in the longitudinal direction thereof.

A swing guide member 40 that guides the traveling of the transmission chain 20 is fixed to the outer surface of the cylinder block CB in the internal combustion engine E. The swing guide member 40 is located between the drive sprocket 10 and the intake side driven sprocket 11. The guide body 41 of the swing guide member 40 has a long and curved shape (bow-shaped shape), and the outside of the curve faces the center side of the internal combustion engine E. That is, the outside of the curve of the guide body 41 faces the outside of the curve of the fixed guide member 30. The transmission chain 20 is in contact with the curved outer surface of the guide body 41. A substantially columnar contact member 42 projects from the inside of the curve of the guide body 41. A pin PN is inserted through the guide main body 41 of the swing guide member 40 on the lower side in the longitudinal direction thereof. The swing guide member 40 is attached to the cylinder block CB in a state where it can swing around the pin PN.

A tensioner 50 that swings the swing guide member 40 by pressing the swing guide member 40 is fixed to the outer surface of the cylinder block CB of the internal combustion engine E. As shown in FIG. 2, the tensioner body 60 of the tensioner 50 has a bottomed cylindrical shape. Specifically, the outer shape of the tensioner body 60 is a substantially square columnar shape. The accommodation hole 61, which is the internal space of the tensioner body 60, has a columnar shape. The accommodating hole 61 of the tensioner body 60 is open to the end face on one side in the axial direction of the tensioner body 60.

As shown in FIG. 1, a plate-shaped upper flange 70 projects from the outer surface of one of the four outer surfaces of the tensioner body 60. One surface of the upper flange 70 in the thickness direction is flush with the outer surface of the four outer surfaces of the tensioner body 60 adjacent to the outer surface overhanging the upper flange 70. The surface of the upper flange 70 on one side in the thickness direction comes into contact with the cylinder block CB when the tensioner 50 is attached to the cylinder block CB. As shown in FIG. 2, in the upper flange 70, the upper bolt hole 71 penetrates in the thickness direction of the upper flange 70.

As shown in FIG. 1, of the four outer surfaces of the tensioner body 60, the plate-shaped lower flange 75 projects from the outer surface opposite to the upper flange 70. One surface of the lower flange 75 in the thickness direction is flush with the outer surface of the four outer surfaces of the tensioner body 60, which is flush with the upper flange 70. The surface of the lower flange 75 on one side in the thickness direction comes into contact with the cylinder block CB when the tensioner 50 is attached to the cylinder block CB. As shown in FIG. 2, the lower flange 75 has a lower bolt hole 76 penetrating in the thickness direction of the lower flange 75. As shown in FIG. 1, the tensioner body 60 is fixed to the cylinder block CB by bolts B inserted through the upper bolt holes 71 of the upper flange 70 and the lower bolt holes 76 of the lower flange 75.

As shown in FIG. 2, the tensioner body 60 is fixed so that the opening of the accommodation hole 61 faces diagonally upward and the opening of the accommodation hole 61 faces the contact member 42 side of the swing guide member 40. Further, an oil supply hole 62 penetrates the peripheral wall of the tensioner body 60 from the outside of the tensioner 50 to the inside of the accommodating hole 61. In the present embodiment, the oil supply hole 62 extends from the outer surface of the tensioner body 60 on the cylinder block CB side toward the inside of the accommodation hole 61 (in the direction of the paper surface thickness in FIG. 2). Then, the oil from the inside of the cylinder block CB is supplied to the inside of the accommodating hole 61 of the tensioner body 60 through the oil supply hole 62.

In the accommodating hole 61 of the tensioner body 60, a bottomed cylindrical plunger 80 is accommodated so as to be slidable in the axial direction of the accommodating hole 61. The internal space 81 of the plunger 80 is open to the end face on one side in the axial direction of the plunger 80. The plunger 80 is housed in the accommodation hole 61 of the tensioner body 60 so that its opening faces the bottom side of the accommodation hole 61.

The internal space 81 of the plunger 80 can be roughly divided into a valve accommodating chamber 82 that opens on one end surface of the plunger 80 in the axial direction and a reserve chamber 83 adjacent to the valve accommodating chamber 82 in the axial direction of the plunger 80. The valve accommodating chamber 82 has a cylindrical shape. Further, the reserve chamber 83 also has a cylindrical shape, and the inner diameter of the reserve chamber 83 is smaller than the inner diameter of the valve accommodating chamber 82. As a result, a step 84 is formed at the boundary between the valve accommodating chamber 82 and the reserve chamber 83.

The valve accommodating chamber 82 in the plunger 80 accommodates a check valve 90 for preventing backflow of oil from the valve accommodating chamber 82 side to the reserve chamber 83 side. The check valve 90 in the present embodiment is composed of a first valve holder 91, a second valve holder 92, and a spherical valve body 93 held by these.

The plate-shaped portion 91a of the first valve holder 91 has an annular shape when viewed in a plan view. The outer diameter of the plate-shaped portion 91a is smaller than the inner diameter of the valve accommodating chamber 82 and larger than the inner diameter of the reserve chamber 83. Further, a cylindrical protruding wall 91b protrudes from the inner edge of the ring of the plate-shaped portion 91a. The first valve holder 91 is arranged so that the protruding wall 91b faces the side opposite to the reserve chamber 83.

The plate-shaped portion 92a of the second valve holder 92 has an annular shape when viewed in a plan view. The outer diameter of the plate-shaped portion 92a of the second valve holder 92 is the same as the outer diameter of the first valve holder 91. Further, the inner diameter of the plate-shaped portion 92a of the second valve holder 92 is larger than the inner diameter of the first valve holder 91. A bottomed cylindrical recess 92b projects from the inner edge of the annulus of the plate-shaped portion 92a of the second valve holder 92. The protruding length of the recess 92b of the second valve holder 92 is longer than the protruding length of the protruding wall 91b of the first valve holder 91. The second valve holder 92 is arranged so that the bottom surface of the recess 92b faces the side opposite to the reserve chamber 83. The second valve holder 92 has a hole (not shown) penetrating in the thickness direction of the second valve holder 92. As a result, oil can be circulated in the thickness direction of the second valve holder 92.

The spherical valve body 93 is arranged so as to be sandwiched between the protruding tip of the protruding wall 91b of the first valve holding body 91 and the bottom surface of the recess 92b of the second valve holding body 92. The diameter of the valve body 93 is larger than the inner diameter at the protruding tip of the protruding wall 91b in the first valve holder 91. Therefore, when the valve body 93 is in contact with the protruding tip of the protruding wall 91b in the first valve holding body 91, the opening of the protruding wall 91b is closed by the valve body 93.

Inside the tensioner body 60, an urging spring 100 is housed on the bottom surface side of the tensioner body 60 as an urging member for urging the plunger 80 in a direction protruding from the tensioner body 60. The urging spring 100 is a spiral spring, and its outer diameter is smaller than the inner diameter of the valve accommodating chamber 82 and larger than the inner diameter of the reserve chamber 83. One end of the urging spring 100 in the axial direction is in contact with the bottom surface of the accommodation hole 61 of the valve accommodation chamber 82. Further, a part of the urging spring 100 on the other side in the axial direction is housed in the valve accommodating chamber 82 of the plunger 80. Then, the other end of the urging spring 100 in the axial direction urges the step 84 of the plunger 80 via the plate-shaped portion 92a of the second valve holding body 92 and the plate-shaped portion 91a of the first valve holding body 91. is doing.

On the outer peripheral surface of the plunger 80, the oil groove 85 is recessed toward the center side of the plunger 80. The oil groove 85 extends over the entire circumference of the plunger 80 in the circumferential direction. The internal oil passage 86 is partitioned by the inner surface of the oil groove 85 and the inner wall of the accommodating hole 61. As shown in FIG. 2, the width of the oil groove 85 is set so that the internal oil passage 86 and the oil supply hole 62 communicate with each other when the plunger 80 is located at the bottommost side of the accommodating hole 61. Further, as shown in FIG. 3, the width of the oil groove 85 is set so that the internal oil passage 86 and the oil supply hole 62 communicate with each other even when the plunger 80 protrudes most.

In the peripheral wall of the plunger 80, a plunger through hole 87 that communicates the reserve chamber 83 and the internal oil passage 86 penetrates. Here, of the opening edges of the accommodating hole 61, the point located at the lowermost point in the vertical direction is defined as the point P. The plunger through hole 87 is located below the horizontal plane HP passing through the point P. In particular, in this embodiment, as shown in FIG. 3, the position of the plunger through hole 87 is determined so that the entire area of the plunger through hole 87 is below the horizontal plane HP even when the plunger 80 protrudes most. Has been done.

As shown in FIG. 2, the plunger tip portion 89, which is the tip end portion on the protruding side of the plunger 80, is in contact with the contact member 42 of the swing guide member 40. The tip surface of the plunger tip portion 89 is an arc surface that is convex in the protruding direction of the plunger 80.

Further, the plunger tip portion 89 has a shape in which a cylindrical wall surface is chamfered. Specifically, as shown in FIG. 4, when the plunger 80 is viewed in a plan view from the tip side, the outer edge of the plunger tip portion 89 has a shape in which a part of both sides of the circle is linearly cut out. .. As a result, the outer edge of the tip portion 89 of the plunger is composed of a pair of arcuate edges 89a and 89d facing each other and a pair of linear edges 89b and 89c connecting both ends of the pair of arcuate edges 89a and 89d. Has been done. Further, the pair of linear edges 89b and 89c extend in parallel. That is, the plunger tip portion 89 has a non-circular shape in a plan view from the axial direction of the plunger 80.

As shown in FIG. 2, a fitting groove 43 as a fitting recess is recessed in the contact surface, which is the end surface of the contact member 42 on the protruding end side. The fitting groove 43 extends linearly from one end to the other on the end face of the abutting member 42. The fitting bottom surface 43a of the fitting groove 43 has a concave arc shape in the direction in which the plunger protrudes. Further, the curvature of the fitting bottom surface 43a of the fitting groove 43 is substantially the same as the curvature of the tip surface of the plunger tip portion 89.

As shown in FIG. 5, the width of the fitting groove 43 is substantially the same as the distance between the linear edges 89b and 89c in the plunger tip portion 89. When the plunger tip portion 89 of the plunger 80 is fitted in the fitting groove 43 of the contact member 42, the linear edge of the plunger tip portion 89 is fitted on the inner wall surface 43b (side surface) of the fitting groove 43 in the contact member 42. 89b and 89c come into contact with each other. As a result, the rotation of the plunger 80 in the circumferential direction is restricted.

The operation of this embodiment, particularly the supply of oil to the tensioner 50, will be described.
In the present embodiment, when the oil is supplied to the oil supply hole 62 of the tensioner body 60 with the drive of the internal combustion engine E, the oil is reserved from the plunger through hole 87 to the plunger 80 via the internal oil passage 86. It flows into room 83. Further, the oil flows from the reserve chamber 83 into the valve accommodating chamber 82. Then, the check valve 90 flows while expanding between the protruding wall 91b of the first valve holder 91 and the valve body 93, and passes through the hole provided in the second valve holder 92 of the check valve 90. As a result, oil flows into the space between the bottom of the accommodation hole 61 and the valve accommodation chamber 82 of the plunger 80 in the accommodation hole 61 of the tensioner body 60. As a result, the space in the accommodating hole 61 is filled with oil.

After the internal combustion engine E is stopped, the supply of oil to the oil supply hole 62 of the tensioner 50 is stopped. Therefore, the oil in the accommodating hole 61 gradually flows out from the protruding side end portion of the plunger 80 in the gap between the inner peripheral surface of the tensioner body 60 and the outer peripheral surface of the plunger 80. Therefore, as the oil flows out, the liquid level of the oil existing between the inner peripheral surface of the tensioner body 60 and the outer peripheral surface of the plunger 80 gradually decreases. Then, the liquid level of the oil existing between the inner peripheral surface of the tensioner body 60 and the outer peripheral surface of the plunger 80 becomes the height of the plunger protruding side end of the gap between the accommodation hole 61 of the tensioner body 60 and the plunger 80. Until then, the oil in the accommodating hole 61 flows out. That is, in the present embodiment, the height when the liquid level of the oil existing between the inner peripheral surface of the tensioner body 60 and the outer peripheral surface of the plunger 80 is the lowest is the opening of the accommodating hole 61 in the tensioner body 60. It has the same height as the point P located at the lowest position in the vertical direction on the edge.

The effect of this embodiment will be described.
(1) In the present embodiment, the plunger through hole 87 of the plunger 80 is positioned below the horizontal plane HP passing through the point P located at the lowest position in the vertical direction among the opening edges of the accommodation hole 61 in the tensioner body 60. is doing. As a result, even when the liquid level of the oil existing between the inner peripheral surface of the tensioner body 60 and the outer peripheral surface of the plunger 80 is at the lowest position, the plunger through hole 87 is submerged in the oil. It is possible to prevent air from entering the reserve chamber 83 through the plunger through hole 87. As a result, it is possible to prevent the oil in the reserve chamber 83 of the plunger 80 from flowing out to the outside, and to suppress an excessive decrease in the amount of oil stored in the reserve chamber 83. Therefore, when the internal combustion engine E is restarted, inappropriate operation of the plunger 80 due to insufficient oil in the reserve chamber 83 can be suppressed.

(2) In the present embodiment, in particular, even when the plunger 80 protrudes most from the accommodation hole 61 in the tensioner body 60, the plunger through hole 87 of the plunger 80 is located below the horizontal plane HP. Therefore, even if the internal combustion engine E is suddenly stopped when the plunger 80 is protruding, since the plunger through hole 87 is submerged in the oil, air is discharged from the plunger through hole 87 to the reserve chamber 83. It is possible to suppress the invasion into. Therefore, the effect of (1) described above can be obtained regardless of the position of the plunger 80 within the slidable range in the axial direction.

(3) In the present embodiment, the plunger tip portion 89 of the plunger 80 has a shape in which a cylindrical wall surface is chamfered. Then, the two-chamfered flat surface portion is fitted between the inner wall surface 43b of the fitting groove 43 into which the plunger tip portion 89 is fitted. This eliminates the need for complicated processing on the tensioner body 60, and can regulate the rotation of the plunger 80 in the circumferential direction with a simpler structure. Therefore, the height position of the plunger through hole 87 changes as the plunger 80 rotates in the circumferential direction, and the plunger through hole 87 is not arranged above the horizontal plane HP.

The above embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
The arrangement of the drive sprocket 10, the intake side driven sprocket 11, the exhaust side driven sprocket 12, and the transmission chain is not limited to the example of the above embodiment. For example, the arrangement of each driven sprocket may be reversed. Further, the tensioner 50 of the above embodiment may be applied not to the transmission chain wound around these sprockets but to the transmission chain around which other members are wound.

-The installation position of the oil supply hole 62 of the tensioner body 60 can be changed. However, the opening on the outer side of the tensioner body 60 in the oil supply hole 62 is above the horizontal surface HP, and it is necessary to prevent the oil from flowing out from the oil supply hole 62 to the outside of the tensioner. When the oil does not flow out from the oil supply hole 62 in this way, the oil supply hole 62 can be arranged so as to open on the lower flange 75 side, that is, vertically downward. In this configuration, since the oil supply hole 62 is located below the horizontal plane HP, the oil supply hole 62 is always submerged in the oil, so that the oil in the reserve chamber 83 is passed through the oil supply hole 62. And air replacement can be prevented.

The tip surface of the plunger tip portion 89 does not have to be an arc surface that is convex toward the protrusion side of the plunger 80. For example, the tip surface of the plunger tip portion 89 may be flat. Further, it is desirable that the fitting bottom surface 43a of the contact member 42 in the swing guide member 40 has a shape corresponding to the tip surface of the plunger tip portion 89 and is in surface contact with the tip surface of the plunger tip portion 89. It does not have to have a shape corresponding to the tip surface of 89.

-The outer edge of the tip portion 89 of the plunger may be non-circular in a plan view, and may be, for example, a shape in which a protrusion is provided in a part of a circle, an ellipse, or a polygonal shape. There may be.

The fitting groove 43 in the contact member 42 does not necessarily have to be groove-shaped. As long as the plunger tip portion 89 has a shape that can be fitted, it may be, for example, a concave portion (fitting concave portion) having a square shape in a plan view.

In the swing guide member 40, the contact member 42 protrudes from the guide body 41, but another member may be interposed between the guide body 41 and the contact member 42. Further, the fitting groove may be recessed in the guide main body 41, and the plunger tip portion 89 may be fitted in the fitting groove. In this case, the guide body 41 also functions as a contact member.

The position of the plunger through hole 87 of the plunger 80 may be at least below the horizontal plane HP when the plunger 80 is located most on the bottom surface side of the tensioner body 60. For example, the position of the plunger through hole 87 of the plunger 80 does not have to be below the horizontal plane HP when the plunger 80 protrudes most. When the internal combustion engine E is stopped, the temperature around the internal combustion engine E drops. Therefore, the total length of the transmission chain 20 tends to be shortened due to heat shrinkage, whereby the transmission chain 20 has a stronger tension than when the internal combustion engine E is driven. Then, the plunger 80 is pushed to the bottom side of the accommodating hole 61 of the tensioner body 60 by the tension of the transmission chain 20. Therefore, when the plunger 80 is moved to the bottom side of the accommodating hole 61 of the tensioner body 60 and the plunger through hole 87 is located below the horizontal plane HP, the tensioner 50 in the tensioner 50 when the internal combustion engine E is stopped. It is possible to prevent the oil in the reserve chamber 83 from becoming excessively low.

-The shape of the plunger 80 does not have to be cylindrical. For example, the shape of the plunger 80 may be a polygonal cylinder. For example, when the accommodating hole 61 of the tensioner body 60 is cylindrical, even if the shape of the plunger 80 is polygonal, it can rotate in the circumferential direction. Therefore, as in the above embodiment, it is preferable to restrict the rotation of the plunger 80 in the circumferential direction by the fitting relationship between the plunger tip portion 89 of the plunger 80 and the contact member 42 of the swing guide member 40. ..

-The urging spring 100 does not have to be a spiral spring. For example, even if it is a leaf spring, it suffices if the plunger 80 can be urged in a direction protruding from the tensioner body 60.
The structure of the check valve 90 is not limited to the example of the above embodiment. For example, a spring may be sandwiched between the valve body 93 and the bottom surface of the recess 92b of the second valve holder 92.

The oil groove 85 is recessed in the outer peripheral surface of the plunger 80 toward the center side of the plunger 80, so that the internal oil passage 86 is partitioned by the inner surface of the oil groove 85 and the inner wall of the accommodating hole 61. An oil groove 85 may be provided on the inner wall of the accommodating hole 61 toward the outside of the inner peripheral wall. Thereby, the internal oil passage 86 may be partitioned by the outer wall of the plunger 80 and the inner wall of the oil groove of the accommodating hole 61. Further, even if the oil groove 85 is not provided, if there is a corresponding difference between the outer diameter of the plunger 80 and the inner diameter of the accommodating hole 61, the outer peripheral surface of the plunger 80 and the inner peripheral surface of the accommodating hole 61 may be formed. Oil can flow quickly between them.

10 ... Drive sprocket, 11 ... Intake side driven sprocket, 12 ... Exhaust side driven sprocket, 20 ... Transmission chain, 30 ... Fixed guide member, 40 ... Swing guide member, 41 ... Guide body, 42 ... Contact member, 43 ... Fitting groove, 43a ... Fitting bottom surface, 43b ... Inner wall surface, 50 ... Tensioner, 60 ... Tensioner body, 61 ... Storage hole, 62 ... Oil supply hole, 70 ... Upper flange, 71 ... Upper bolt hole, 75 ... Lower side Flange, 76 ... Bolt hole, 80 ... Plunger, 81 ... Internal space, 82 ... Valve accommodation chamber, 83 ... Reserve chamber, 84 ... Step, 85 ... Oil groove, 86 ... Internal oil passage, 87 ... Plunger through hole, 89 ... Flange tip, 89a ... arc-shaped edge, 89b ... straight edge, 89c ... straight edge, 89d ... arc-shaped edge, 90 ... check valve, 91 ... first valve holder, 91a ... plate-shaped part, 91b protrusion Wall, 92 ... 2nd valve holder, 92a ... Plate-shaped part, 92b ... Recess, 100 ... Bounce spring, B ... Bolt, CB ... Cylinder block, E ... Internal combustion engine, HP ... Horizontal plane, P ... Point, PN ... pin.

Claims (1)

It is a tensioner mounting structure applied to an internal combustion engine provided with a guide member for guiding the running of the chain and a tensioner for giving an urging force to the guide member.
The tensioner is
A tensioner body with a columnar storage hole with one end open,
A cylindrical plunger inserted into the accommodation hole so as to be slidable in the axial direction of the accommodation hole,
It is provided with an urging member which is arranged inside the accommodating hole and urges the plunger in a direction protruding from the tensioner body.
The guide member is
A contact member with which the tip of the plunger abuts is provided.
The tensioner body is fixed so that the tip of the plunger points diagonally upward.
A plunger through hole is penetrated from the outside to the inside of the plunger in the peripheral wall of the plunger.
With the plunger most protruding from the tensioner body, the plunger through hole is located below the horizontal plane at the same height as the lowest point in the vertical direction of the opening edge of the tensioner body. Plumb bob
The tip of the plunger has a non-circular shape in a plan view from the axial direction of the plunger.
A tensioner mounting structure in which the contact member is provided with a fitting recess into which the tip end portion of the plunger is fitted, and the rotation of the plunger in the circumferential direction is restricted by the inner wall surface of the fitting recess.

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