JP2009236300A - Mounting structure of torque transmission component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a torque transmission component specifically and easily distinguishing the wrong assembling state of a component attached to a shaft body in advance as a difference in movement of a component attached later. <P>SOLUTION: In this mounting structure of the torque transmission component, a pulley 13 abuts on a sprocket 12 attached to the component mounting surface 11a of a crankshaft 11 and is pressed by a fastening member 14 to push the sprocket 12 to an abutting part 11b. The crankshaft 11 has a first positioning part 21 positioning the sprocket 12 in a rotational direction to one side of the component mounting surface 11a by irregular engagement, and a second positioning part 22 positioning the pulley 13 in the rotational direction to the other side of the component mounting surface 11a by irregular engagement. When the pulley 13 is attached to the crankshaft 11 with the sprocket 12 disengaged from the first positioning part 21, the pulley 13 abuts on the sprocket 12 to regulate engagement with the second positioning part 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a torque transmitting component in which a component attached to a shaft body is abutted against an abutting portion on one end side in the axial direction of the cylindrical component attaching surface and is positioned at a specific position in the circumferential direction by concave-convex engagement. It relates to the mounting structure.

  Generally, a mounting structure that is mounted with a torque transmission component (including power transmission component included) positioned in a circumferential direction at a specific position on a shaft body and mounted in a non-rotating state is used in various devices, such as keys, splines, and serrations. Etc. are often used.

  If high mounting accuracy (coaxial accuracy or mounting accuracy at right angles to the shaft) is required to enable high-speed rotation, for example, the crankshaft of an internal combustion engine for a vehicle is connected to a crank pulley for driving accessories. When a transmission part such as a sprocket for driving a valve mechanism is fixed, a mounting structure using a key is common.

  As a conventional mounting structure for this type of torque transmission component, for example, a crankshaft having a cylindrical component mounting surface and a butting portion that abuts against a sprocket mounted on the mounting surface from one side in the axial direction, and its butting A sprocket attached to the crankshaft so as to hit the crankshaft, a crank pulley attached to the crankshaft so as to hit the sprocket from the other side in the axial direction, and tightening the crank pulley from the other side in the axial direction to fix the sprocket to the end of the crankshaft. Some have a fastening bolt that presses against the abutting portion. In this mounting structure, one end portion of the fixed key is inserted into the hub portion of the sprocket to prevent the fixed key from dropping or changing the mounting posture when the crank pulley is mounted (for example, Patent Document 1). reference).

In addition, the bolt holes for mounting are offset in the direction of the crankshaft in order to detect and prevent erroneous assembly of the large-diameter end of the connecting rod and the cap connected to the crankshaft at a low cost. There is also known a power transmission component mounting structure in which when the cap is attached to the part in the wrong direction, the cap comes into contact with the connecting rod arm and the assembly is not completed (see, for example, Patent Document 2). ).
Japanese Patent Application Laid-Open No. 07-190079 Japanese Patent Laid-Open No. 10-318245

  However, in the conventional torque transmission component mounting structure as described above, when the assembly state of the component that is first attached to the shaft body is incomplete or incorrect, the component that is subsequently assembled. It is not easy to determine the quality of the parts that have been installed first, and the bolts are tightened in the wrong installation state, resulting in damage to the parts or misalignment of chains, belts, etc. There was a possibility of inviting.

  In particular, when a crank sprocket smaller than the pulley is attached to the rear side of the crank pulley, it is not easy to reliably visually check the engagement state of the crank sprocket, and the uneven engagement depth is particularly small. There is concern that the above problems will be caused in a compact engine.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a torque transmission component mounting structure in which an erroneous assembly state of a component that is first attached to a shaft body can be clearly and extremely easily determined as a difference in movement of a component that is attached later. With the goal.

  In order to achieve the above object, the torque transmission component mounting structure according to the present invention (1) abuts against a cylindrical component mounting surface and a component mounted on the component mounting surface from one side in the axial direction of the component mounting surface. A shaft body having a butting portion, a first torque transmitting component mounted on the component mounting surface of the shaft body so as to abut against the butting portion, and the first torque transmission component from the other side in the axial direction of the component mounting surface. A second torque transmitting component mounted on the component mounting surface of the shaft body so as to abut against the torque transmitting component, and the second torque transmitting component from the other axial side of the component mounting surface to one axial side An urging means for urging the first torque transmitting component against the abutting portion, wherein the shaft body is axially directed to the component mounting surface. One side And a first positioning portion for positioning the first torque transmission component in the rotational direction by engaging with the first torque transmission component in a concavo-convex manner, and on the other axial side of the component mounting surface, the second A second positioning portion for positioning the second torque transmission component in a rotational direction by engaging with the torque transmission component in a concave-convex manner, and the first torque transmission component being detached from the first positioning portion When the second torque transmission component is attached to the component mounting surface, the second torque transmission component abuts against the first torque transmission component and the engagement with the second positioning portion is restricted. It is what I did.

  With this configuration, when the second torque transmission component is attached to the component mounting surface of the shaft body in a state where the first torque transmission component is detached from the first positioning portion of the shaft body, the second torque transmission component is When the first torque transmission component is attached to the shaft body by restricting the engagement with the second positioning portion by striking the first torque transmission component, whether or not the first torque transmission component is attached first to the shaft body is determined. It is possible to clearly and very easily discriminate as a change in movement depending on whether or not the second torque transmission component is engaged with the second positioning portion, for example, whether or not the movement in the circumferential direction is possible and whether or not there is a catch on the movement.

  In the torque transmission component mounting structure having the configuration described in (1) above, (2) the engagement depth between the first torque transmission component and the first positioning portion in the axial direction of the component mounting surface is The first torque transmission component is disengaged from the first positioning portion, the engagement depth being greater than the engagement depth between the second torque transmission component and the second positioning portion in the axial direction of the component mounting surface. When the second torque transmission component is attached to the component mounting surface, the second torque transmission component abuts on the first torque transmission component to a position where it can engage with the second positioning portion. The axial movement is preferably restricted.

  With this configuration, when the assembly state of the first torque transmission component that is first attached to the shaft body is defective, the second torque transmission component that is attached later reaches a position where the second torque transmission component can be engaged with the second positioning portion. The second torque transmission component cannot be caught in the circumferential movement, and the circumferential position is not specified. On the other hand, when the assembled state of the first torque transmission component that is first attached to the shaft body is normal, the second torque transmission component that is attached later reaches a position where the second torque transmission component can be engaged with the second positioning portion. The second torque transmission component is caught in the circumferential movement, and the circumferential positioning is achieved. Therefore, it is possible to clearly and very easily determine whether the first torque transmission component attached to the shaft body is attached or not as the difference in movement of the second torque transmission component attached later to the shaft body. .

  In the torque transmission component mounting structure having the configuration described in (2) above, (3) the first torque transmission component and the first positioning portion are uneven in the axial direction of the component mounting surface. It is preferable.

  With this configuration, the first torque transmission component has a different axial position depending on the presence or absence of circumferential positioning by the first positioning portion, and the second torque transmission when the positioning of the first torque transmission component is not completed. The engagement of the part with the second positioning portion can be easily restricted.

  The torque transmission component mounting structure having the configuration described in (3) above is as follows: (4) The first positioning portion is concave toward the other side in the axial direction of the component mounting surface in the vicinity of the abutting portion. The first torque transmission component may have a convex portion that fits into the concave first positioning portion.

  With this configuration, it is easy to process parts of the shaft body.

  In the torque transmission component mounting structure having the configuration described in (1) to (4) above, (5) the second torque transmission component and the second positioning portion are arranged in the radial direction of the component mounting surface. It is preferable even if it is uneven.

  With this configuration, the positioning accuracy of the second positioning portion can be made high using the component mounting surface while having a simple uneven shape.

  The structure for mounting a torque transmission component having the configuration described in (5) above is as follows. (6) The second positioning portion has a concave shape located radially inside the component mounting surface, and the second torque transmission. It is preferable that the component has a convex portion that fits into the concave second positioning portion.

  With this configuration, the second torque transmission component can be fitted into the second positioning portion in the circumferential direction in the later stage of the mounting operation, and can be positioned in the circumferential direction. It is easily possible to discriminate based on the difference in the movement of parts.

  In the torque transmission component mounting structure having the configuration described in (1) to (6) above, (7) the shaft body is preferably a crankshaft of an internal combustion engine.

  With this configuration, it is difficult to see the mounting state of the first torque transmission component to be mounted first, and even if it is a crankshaft that can rotate at a high speed, the torque transmission component such as a pulley or sprocket is to be mounted in an incorrect state. Can be surely prevented from being damaged.

  (1) The first torque transmission component and the second torque transmission component are each wound by an endless rotation transmission element. Even a pulley or a toothed wheel is preferable.

  With this configuration, even torque transmission parts such as pulleys and sprockets that require mounting accuracy to the shaft body can be surely prevented from being damaged in an erroneous state.

  In the torque transmission component mounting structure having the configuration described in (1) to (8) above, (9) while the urging means presses the second torque transmission component against the first torque transmission component. A fastening member that is screwed to the shaft body so as to press the first torque transmission component against the abutting portion and fasten and fix the first torque transmission component and the second torque transmission component to the shaft body. It is preferable that it is comprised by these.

  With this configuration, prior to screw fastening by the fastening member, it is possible to clearly determine whether the first torque transmission component is attached or not from the state of movement of the second torque transmission component, and damage the component due to incorrect fastening work. This can be surely prevented.

  According to the present invention, when the second torque transmission component is attached to the component mounting surface of the shaft body with the first torque transmission component detached from the first positioning portion of the shaft body, the second torque transmission component As the first torque transmission component is attached to the shaft body by restricting the engagement with the second positioning portion by striking the first torque transmission component, the quality of the assembled state of the first torque transmission component attached to the shaft body can be attached later. It is possible to clearly and very easily determine a change in movement depending on whether or not the second torque transmission component is engaged with the second positioning portion, for example, whether or not the movement in the circumferential direction is possible and whether or not there is a catch on the movement. Therefore, it is possible to clearly and extremely easily identify the torque transmission component mounting structure in which the wrong assembly state of the component mounted first on the shaft body can be clearly identified as the difference in the movement of the component mounted later. It is possible to provide a.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing a torque transmission component mounting structure according to an embodiment of the present invention, and illustrates the case where the present invention is applied to a crank sprocket and crank pulley mounting structure on a crankshaft. FIG. 2 is an enlarged perspective view of a main part of the crank pulley, and FIG. 3 is an enlarged perspective view of the vicinity of a component mounting surface of the crankshaft.

  First, the configuration will be described.

  As shown in FIG. 1, the torque transmission component mounting structure of the present embodiment includes a crankshaft 11 that is a shaft body, a crank sprocket 12 and a crank pulley 13 that are torque transmission components that are attached to the crankshaft 11, and And a fastening member 14 for fastening and fixing the crank sprocket 12 and the crank pulley 13 to the crankshaft 11.

  The crankshaft 11 is rotatably supported by an engine block of a vehicle internal combustion engine (not shown) in the vicinity of the shaft end portion shown in FIG. 1 (right side in FIG. 1) and in the vicinity of the opposite end portion. The cylindrical component mounting surface 11a and the crank sprocket 12 mounted on the component mounting surface 11a abut against the end side shown in FIG. 1 from one side in the axial direction of the component mounting surface 11a (the right side in FIG. 1). It has a butting part 11b. Further, a stepped surface 11 c that is orthogonal to the rotation center axis CL of the crankshaft 11 is formed between the abutting portion 11 b of the crankshaft 11 and the cylindrical component mounting surface 11 a.

  The crank sprocket 12 is a first torque transmission component that is mounted on the component mounting surface 11a of the crankshaft 11 so as to abut against the abutting portion 11b, and a cam drive chain 15 (endless rotation transmission) is provided on the outer periphery thereof. A tooth portion 12t around which an element) is wound is provided, and a cylindrical hub portion 12h that is fitted to the component mounting surface 11a of the crankshaft 11 is provided at the center. That is, the crank sprocket 12 is a toothed wheel, and transmits the rotation of the crankshaft 11 to the cam drive chain 15 as power for turning the cam drive chain 15 along a fixed track. It has become. The cam drive chain 15 is housed in the engine block so as to drive a valve mechanism (not shown) of the internal combustion engine.

  The crank pulley 13 drives an auxiliary machine of the internal combustion engine, for example, an alternator, an oil pump, an air conditioner compressor, a power steering oil pump, and the like by belt transmission, and the other side in the axial direction of the component mounting surface 11a (FIG. 1). The second torque transmission component is mounted on the component mounting surface 11a of the crankshaft 11 so as to abut against the crank sprocket 12 from the left side in the middle. The crank pulley 13 includes a pulley portion 13p around which a V-ribbed belt 16 (endless rotation transmission element) (not shown) is wound outside the engine block, and a cylindrical hub that is fitted to a component mounting surface 11a of the crankshaft 11. 13h and a rubber elastic body 13m interposed between the pulley portion 13p and the hub portion 13h. Although not shown in detail, the V-ribbed belt 16 is wound around driving pulleys of auxiliary machinery. That is, the crank pulley 13 is a power transmission pulley that transmits the rotation of the crankshaft 11 to the V-ribbed belt 16 as power for rotation of the V-ribbed belt 16 along a fixed track.

  The crankshaft 11 passes through a side wall portion of an engine block (not shown) in the vicinity of the hub portion 13h of the crank pulley 13, and the through-hole portion is a seal that slidably contacts the hub portion 13h of the crank pulley 13. Sealed by a member (not shown).

  The fastening member 14 urges the crank pulley 13 from the left end side (the other axial direction side) in FIG. 1 to the right end side (the one axial direction side) in FIG. Is an urging means that presses against the abutting portion 11b.

  The fastening member 14 is screwed into a female screw hole 11h formed at the end of the crankshaft 11 shown in FIG. 1, and the crank pulley 13 is connected to the crank sprocket 12 when the fastening member 14 is tightened. The crank sprocket 12 is pressed against the abutting portion 11b while being abutted, and the crank sprocket 12 and the crank pulley 13 are fastened and fixed to the crankshaft 11.

  On the other hand, the crankshaft 11 has, on the right end side (one axial direction side) in the figure of the component mounting surface 11a, a first positioning portion 21 that engages with the crank sprocket 12 and positions the crank sprocket 12 in the rotational direction. And a second positioning portion 22 for engaging the crank pulley 13 in an uneven manner and positioning the crank pulley 13 in the rotational direction on the left end side (the other side in the axial direction) of the component mounting surface 11a. .

  The crank sprocket 12 and the first positioning portion 21 are engaged with each other with irregularities in the axial direction of the component mounting surface 11a. Specifically, the first positioning portion 21 is connected to the abutting portion 11b. In the vicinity, a concave shape opened toward the left end side in FIG. 1 (the other side in the axial direction) and the radially outward side of the component mounting surface 11a is formed, and the crank sprocket 12 is fitted to the concave first positioning portion 21. It has the convex part 23 to do.

  The convex portion 23 of the crank sprocket 12 has a substantially rectangular cross-sectional shape in FIG. 1, but the cross-sectional shape orthogonal to the rotation center axis CL of the crankshaft 11 is arbitrary, for example, a circular shape, a square shape, or a specific central angle. Any of arc shape etc. may be sufficient. Further, the convex portion 23 may be formed integrally with the crank sprocket 12, may be a separate piece part fixed to the crank sprocket 12, or a plurality of the convex portions 23 may be installed.

  The crank pulley 13 and the second positioning portion 22 are engaged with each other in an uneven manner in the radial direction of the component mounting surface 11a. Specifically, the second positioning portion 22 is connected to the component mounting surface 11a. The crank pulley 13 has a convex portion 24 that fits into the concave second positioning portion 22.

  In the present embodiment, the second positioning portion 22 has a concave shape opened outward in the radial direction of the component mounting surface 11 a, and the convex portion 24 of the crank pulley 13 is formed on the concave second positioning portion 22. It protrudes inward in the radial direction from the inner peripheral surface of the crank pulley 13 so as to be fitted.

  The engagement depth e1 between the crank sprocket 12 and the first positioning portion 21 in the axial direction of the component mounting surface 11a is the relationship between the crank pulley 13 and the second positioning portion 22 in the axial direction of the component mounting surface 11a. When the crank pulley 13 is attached to the component mounting surface 11a in a state where the crank sprocket 12 is detached from the first positioning portion 21 and is larger than the combined depth e2 (e1> e2), the crank pulley 13 hits the crank sprocket 12 As a result, the axial movement of the crank pulley 13 to the position where the crank pulley 13 can engage with the second positioning portion 22 is restricted.

  That is, when the crank pulley 13 is attached to the component attachment surface 11a with the crank sprocket 12 detached from the first positioning portion 21, the crank pulley 13 abuts against the crank sprocket 12 and engages with the second positioning portion 22. Is becoming regulated.

  Next, the operation will be described.

  In the power transmission member mounting structure of the present embodiment configured as described above, the crank sprocket 12 is not correctly positioned as shown in FIG. 1, and for example, as shown in FIG. When the crank pulley 13 is attached to the component attachment surface 11a of the crankshaft 11 in a state where the crank pulley 13 is detached from the first positioning portion 21 of the crankshaft 11, the crank pulley 13 abuts against the crank sprocket 12 as shown in FIG. Thus, the convex portion 24 of the crank pulley 13 cannot reach a position where it can engage with the second positioning portion 22. That is, the engagement of the crank pulley 13 with the second positioning portion 22 is restricted.

  At this time, since the convex portion 24 does not engage with the second positioning portion 22 in the crank pulley 13, the circumferential position with respect to the crankshaft 11 is not specified while being rotatable with respect to the crankshaft 11. It becomes a state.

  On the other hand, when the crank sprocket 12 is correctly positioned as shown in FIG. 1, the convex portion 23 of the crank sprocket 12 is engaged with the first positioning portion 21 of the concave crankshaft 11. When the crank pulley 13 is attached to the component mounting surface 11a of the crankshaft 11, before the crank pulley 13 abuts against the crank sprocket 12, the crank pulley 13 reaches a position where the convex portion 24 can be engaged with the second positioning portion 22. And the crank pulley 13 is engaged with the second positioning portion 22. When the crank pulley 13 is positioned and fixed in the circumferential direction with respect to the crankshaft 11, the crank pulley 13 becomes non-rotatable with respect to the crankshaft 11, and the circumferential position with respect to the crankshaft 11 is specified. It becomes a state.

  Therefore, whether the assembled state of the crank sprocket 12 attached to the crankshaft 11 is acceptable or not depends on whether the crank pulley 13 attached later is engaged with the second positioning portion 22 or not. It is possible to clearly and very easily determine whether or not the movement in the circumferential direction is possible, a large difference in the movable range, or whether or not there is a catch on the movement.

  Further, in the present embodiment, the engagement depth e1 between the crank sprocket 12 and the first positioning portion 21 in the axial direction of the component mounting surface 11a of the crankshaft 11 is equal to the crank pulley 13 in the axial direction of the component mounting surface 11a. Since it is larger than the engagement depth e2 with the second positioning portion 22, when the assembled state of the crank sprocket 12 that is attached to the crankshaft 11 is poor, the crankshaft 11 is later attached to the crankshaft 11. The crank pulley 13 to be attached cannot reach the position where the second positioning portion 22 can be engaged, and the crank pulley 13 is not caught in the circumferential movement and the circumferential position is not specified. 11 when the assembled state of the crank sprocket 12 that is attached first is normal. That the crank pulley 13 reaches to a position to engage the second positioning portion 22, the state caught in the circumferential direction of the movement is made in the circumferential positioning occurs the crank pulley 13. Therefore, whether the crank sprocket 12 attached to the crankshaft 11 is attached or not can be clearly and very easily determined as the difference in the movement of the crank pulley 13 attached to the crankshaft 11 later.

  Furthermore, since the crank sprocket 12 and the first positioning portion 21 are uneven in the axial direction of the component mounting surface 11a, the crank sprocket 12 is axially determined by the presence / absence of circumferential positioning by the first positioning portion 21. Thus, the position of the crank sprocket 12 is not completed, and the engagement of the crank pulley 13 with the second positioning portion 22 can be easily restricted.

  Further, the first positioning portion 21 has a concave shape opened toward the left end side (the other side in the axial direction) in FIG. 1 of the component mounting surface 11a in the vicinity of the abutting portion 11b, and the crank sprocket 12 has the concave shape. Since it has the convex part 23 fitted to the 1st positioning part 21, the components process of the crankshaft 11 becomes easy.

  Furthermore, since the crank pulley 13 and the second positioning portion 22 are uneven in the radial direction of the component mounting surface 11a, the component mounting surface 11a is formed while the second positioning portion 22 has a simple uneven shape. Can be used to increase the positioning accuracy.

  In addition, the second positioning portion 22 has a concave shape located inside the component mounting surface 11a in the radial direction, and the crank pulley 13 has a convex portion that fits into the concave second positioning portion 22. Therefore, the crank pulley 13 can be positioned in the circumferential direction by fitting the second positioning portion 22 to the second positioning portion 22 in the later stage of the mounting operation, and whether or not the mounting state of the crank sprocket 12 that is the previous mounting part is good or bad can be determined later. The determination can be made reliably and very easily by the difference in movement during the mounting operation of the crank pulley 13 as the mounting part.

  Further, in the vicinity of the shaft end portion of the crankshaft 11, it is difficult to visually recognize the mounting state of the crank sprocket 12 to be mounted first, and the crankshaft 11 is a mounting part that can rotate at a high speed. Thus, it is possible to prevent the torque transmission component from being attached in an erroneous state, and to prevent the crank sprocket 12 and the crank pulley 13 that are required to be attached to the crankshaft 11 from being damaged. The

  Further, the fastening member 14 presses the crank sprocket 12 against the abutting portion 11b while pressing the crank pulley 13 against the crank sprocket 12 so that the crank sprocket 12 and the crank pulley 13 are fastened and fixed to the crankshaft 11. Therefore, it is possible to clearly determine whether the crank sprocket 12 is attached or not from the state of movement of the crank pulley 13 in the screw tightening direction prior to the screw fastening operation of the fastening member 14.

  Thus, in the torque transmission component mounting structure of the present embodiment, the crank pulley 13 is mounted on the component mounting surface 11a of the crankshaft 11 with the crank sprocket 12 detached from the first positioning portion 21 of the crankshaft 11. As a result, the crank pulley 13 abuts against the crank sprocket 12 to restrict the engagement with the second positioning portion 22, and whether the assembled state of the crank sprocket 12 that is attached to the crankshaft 11 first is attached later. It becomes possible to clearly and very easily determine a change in movement depending on whether or not the crank pulley 13 is engaged with the second positioning portion 22, for example, whether or not the movement in the circumferential direction is possible and whether or not there is a catch on the movement. As a result, it is possible to provide a torque transmission component mounting structure in which an erroneous assembly state of a component first attached to the crankshaft 11 can be clearly and very easily determined as a difference in movement of components to be attached later. .

  In the above-described embodiment, the shaft body is the crankshaft, but another rotating shaft may be used. Further, the torque transmission component does not necessarily need to be a power transmission component such as the crank sprocket 12 or the crank pulley 13 of the above-described embodiment, and even when the torque transmission member is attached to a non-rotating shaft, The present invention is applicable.

  Further, in the above-described embodiment, the cylindrical component mounting surface is exemplified as the component mounting surface of the shaft body. However, the torque transmission component mounted on the shaft body has sufficient relative to the shaft body in the same manner as the cylindrical component mounting surface. Any rotation angle can be ensured. For example, a D-shaped cross-section obtained by plane-cutting a cylindrical shaft, an oval cross-section, or other non-circular cross-sectional shapes can be used.

  Further, the abutting portion located on one side in the axial direction of the component mounting surface is not limited to the one that forms the annular abutting surface as in the above-described embodiment, and the crank sprocket is partly in the circumferential direction. 12 may be sufficient as long as it hits 12 or a protrusion that hits the crank sprocket 12 at least at one place in the circumferential direction.

  Needless to say, the biasing means is not limited to a fastening part such as a bolt, and may be a combination of a retaining part and a spring.

  Further, the first positioning portion and the second positioning portion provided on the shaft body are both concave in the above-described embodiment, but may be convex. In that case, of course, a concave portion having a concave shape corresponding to the convex first positioning portion and the second positioning portion is formed on the torque transmission member side.

  As described above, in the torque transmission component mounting structure according to the present invention, the second torque transmission component is mounted on the shaft body in a state where the first torque transmission component is detached from the first positioning portion of the shaft body. When attached to the surface, the second torque transmission component abuts against the first torque transmission component and the engagement with the second positioning portion is restricted, so that the first torque transmission first attached to the shaft body Whether the assembled state of the part is good or not depends on whether or not the second torque transmitting part to be attached later is engaged with the second positioning part, for example, whether or not the movement in the circumferential direction is possible and whether or not there is a catch on the movement. As a result, the wrong assembly state of the parts that are attached to the shaft body can be clearly identified as the difference in the movement of the parts that are attached later. It is possible to provide a torque transmission component mounting structure that can be easily discriminated at the same time, and abutment portion on one end side in the axial direction of the cylindrical component mounting surface of the component mounted on the shaft body It is useful for the entire mounting structure of a torque transmitting component that is positioned at a specific position in the circumferential direction by engaging with the concave and convex portions.

1 is a cross-sectional view showing a structure for attaching a torque transmission component according to an embodiment of the present invention, illustrating a case where the present invention is applied to a structure for attaching a crank sprocket and a crank pulley to a crankshaft. It is a principal part expansion perspective view of the crank pulley in the attachment structure of the torque transmission component which concerns on one Embodiment. FIG. 3 is an enlarged perspective view of the vicinity of a component mounting surface of a crankshaft in a torque transmission component mounting structure according to an embodiment. It is sectional drawing which shows the attachment structure of the torque transmission component which concerns on one Embodiment, and has shown the positioning incomplete state of the crank sprocket.

Explanation of symbols

11 Crankshaft 11a Component mounting surface 11b Abutting portion 11h Female thread hole portion 12 Crank sprocket (first torque transmission component)
12c Abutting surface 12h, 13h Hub portion 12t Tooth portion 13 Crank pulley (second torque transmission component)
13m Rubber elastic body 13p Pulley part 14 Fastening member (biasing means)
15 Cam drive chain (endless rotation transmission element)
16 V-ribbed belt (endless rotation transmission element)
18 Washer 23 Convex part (first engaging part)
24 convex portion (second engaging portion)
e1, e2 engagement depth

Claims (9)

A shaft body having a cylindrical component mounting surface and a butting portion that abuts against a component mounted on the component mounting surface from one side in the axial direction of the component mounting surface;
A first torque transmission component mounted on the component mounting surface of the shaft body so as to abut against the abutting portion;
A second torque transmission component mounted on the component mounting surface of the shaft body so as to abut against the first torque transmission component from the other axial side of the component mounting surface;
Urging means for urging the second torque transmission component from the other axial side of the component mounting surface to the other axial side and pressing the first torque transmission component against the abutting portion; A torque transmission component mounting structure,
The shaft body has a first positioning portion on one side in the axial direction of the component mounting surface for engaging the first torque transmission component in an uneven manner to position the first torque transmission component in the rotation direction. And a second positioning portion for engaging the second torque transmission component in a concave-convex manner and positioning the second torque transmission component in the rotational direction on the other side in the axial direction of the component mounting surface.
When the second torque transmission component is mounted on the component mounting surface in a state where the first torque transmission component is detached from the first positioning portion, the second torque transmission component is the first torque transmission. An attachment structure for a torque transmission component, wherein the engagement with the second positioning portion is restricted by striking the component. The engagement depth between the first torque transmitting component and the first positioning portion in the axial direction of the component mounting surface is such that the second torque transmitting component and the second in the axial direction of the component mounting surface. Greater than the depth of engagement with the positioning part,
When the second torque transmission component is mounted on the component mounting surface in a state where the first torque transmission component is detached from the first positioning portion, the second torque transmission component is the first torque transmission. 2. The torque transmission component mounting structure according to claim 1, wherein axial movement to a position where the second positioning portion can be engaged with the second positioning portion is restricted.   3. The torque transmission component according to claim 1, wherein the first torque transmission component and the first positioning portion are uneven in an axial direction of the component mounting surface. Mounting structure.   The first positioning portion has a concave shape toward the other side in the axial direction of the component mounting surface in the vicinity of the abutting portion, and the first torque transmitting component is fitted to the concave first positioning portion. The mounting structure for a torque transmission component according to claim 3, further comprising a projecting portion.   5. The device according to claim 1, wherein the second torque transmission component and the second positioning portion are uneven in a radial direction of the component mounting surface. The mounting structure of the torque transmission component as described in the section.   The second positioning portion has a concave shape located inside the component mounting surface in the radial direction, and the second torque transmission component has a convex portion that fits into the concave second positioning portion. The torque transmission component mounting structure according to claim 5, wherein   The torque transmission component mounting structure according to any one of claims 1 to 6, wherein the shaft body is a crankshaft of an internal combustion engine.   The first torque transmission component and the second torque transmission component are each a pulley or a toothed wheel around which an endless rotation transmission element is wound. The torque transmission component mounting structure according to any one of claims.   The urging means presses the first torque transmission component against the abutting portion while pressing the second torque transmission component against the first torque transmission component, and the first torque transmission component and the 9. The method according to claim 1, wherein the second torque transmission component is constituted by a fastening member screwed to the shaft body so as to fasten and fix the second torque transmission component to the shaft body. Mounting structure for torque transmission parts as described in 1.

Images