JP2007263161A - Shaft fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the fitting force of a shaft in a shaft-mounted member and standardize the shaft and shaft mounted member. <P>SOLUTION: A shaft fitting structure 10 is equipped with a shaft 11a containing a snap ring mounting groove 21 in the outer peripheral surface thereof, a snap ring 12 mounted in the snap ring mounting groove of the shaft so as to be elastically contracted, a shaft-mounted member 14 including an insertion hole into which a shaft is inserted, and a plurality of snap ring engaging grooves 31, 32 which respectively keep the snap ring mounted in the snap ring mounting groove fitted to the inner peripheral surface of the insertion hole and in which a side surface on a shaft drawing side is chamfered at a different angle. In the shaft fitting structure, the fitting force of a shaft in shaft-mounted member can be adjusted by selecting one snap ring engaging groove, which is to be engaged with the snap ring in the shaft-mounted member, from among a plurality of the snap ring engaging grooves. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shaft fitting structure for fitting a shaft to a shaft-mounted member. For example, the present invention is incorporated in a drive system of an automobile and transmits a rotational force at a constant speed between rotating shafts that exist on a non-linear line. It is related with the thing applicable as a shaft omission prevention structure of the constant velocity universal joint used for the constant velocity universal joint which performs.

  For example, in an automobile drive system or the like, a retaining ring mounting groove is formed on the outer peripheral surface of a shaft, and a retaining ring that can be elastically reduced in diameter is mounted in the retaining ring mounting groove. On the other hand, a retaining ring engaging groove is formed in the insertion hole of the shaft mounting member. Then, the retaining ring of the shaft inserted into the insertion hole of the shaft-mounted member is elastically expanded in the retaining ring engaging groove, so that the shaft and the shaft-mounted member are axially connected via the retaining ring. Is engaged. That is, in the direction in which the shaft is pulled out, the retaining ring mounted in the retaining ring mounting groove of the shaft is prevented from interfering with the retaining ring engaging groove and the shaft is prevented from coming off.

  In Japanese Patent Laid-Open No. 08-68426, the position where the retaining ring is attached to the shaft is a root portion when the shaft is inserted into the inner ring, and at such a position, the diameter of the retaining ring is reduced to the end face side of the inner ring. What provided the tool engagement groove | channel is disclosed.

In Japanese Utility Model Publication No. 64-5124, a sealing member is formed on a shaft mounting member by forming a chamfer on an end face of a retaining ring engaging groove with which a retaining ring engages, and appropriately reducing the diameter of the retaining ring. A shaft that can be inserted and removed without damaging the shaft is disclosed. In this publication, there is a description relating to connecting a drive shaft provided on an outer ring of a constant velocity universal joint to a differential device.
Japanese Patent Laid-Open No. 08-68426 Japanese Utility Model Publication No. 64-5124

  With regard to such a shaft fitting structure, for example, in the connection structure between the inner joint member of the constant velocity universal joint and the shaft, the structure in which the shaft can be extracted from the inner joint member for the purpose of simplifying the work in the maintenance process such as boot replacement. May be required. In addition, due to different circumstances, in such a connection structure, it may be required to have a structure in which the shaft is not removed from the shaft mounting member. These specifications have different requirements depending on manufacturers or vehicle types. For this reason, if both specifications can be properly used while making the structure of the shaft and the shaft-mounted member the same, parts can be shared in both specifications, and the number of parts management man-hours can be reduced.

  The structure described in Japanese Patent Application Laid-Open No. 08-68426 has a structure that can be assembled and disassembled. In this case, however, it has been necessary to spend time and money on machining the tool engagement groove of the inner ring.

  In addition, the one described in Japanese Utility Model Publication No. 64-5124 cannot adjust the fitting force between the shaft and the shaft-mounted member because the force required to extract the shaft from the shaft-mounted member is constant. For this reason, it is necessary to change parts of the shaft-mounted member between the structure in which the shaft can be extracted from the shaft-mounted member and the structure in which the shaft cannot be removed from the shaft-mounted member.

  The shaft fitting structure according to the present invention includes a shaft in which a retaining ring mounting groove is formed on the outer peripheral surface, a retaining ring that is elastically mounted in the retaining ring mounting groove of the shaft so as to be able to reduce the diameter, and the shaft is inserted. A shaft-mounted member with an insertion hole formed therein and a retaining ring fitted in a retaining ring mounting groove of the shaft are fitted on the inner peripheral surface of the insertion hole, and the side surface on the shaft withdrawal side is chamfered at different angles Retaining ring engaging grooves.

  In this case, the shaft is provided with a stopper that defines a position where the shaft is inserted into the shaft-mounted member, and the shaft is inserted into the plurality of retaining ring engaging grooves of the shaft-mounted member in a state where the shaft is inserted at the position defined by the stopper. Each of the corresponding positions may be provided with a retaining ring mounting groove.

  This shaft fitting structure is provided with a plurality of retaining ring engaging grooves whose side surfaces on the shaft pulling side are chamfered at different angles on the inner peripheral surface of the insertion hole of the shaft mounting member, and are attached to the shaft. By selecting which retaining ring engaging groove to fit the wheel, the fitting force between the shaft and the shaft mounting member changes.

  For example, with respect to a plurality of retaining ring engaging grooves, by adjusting the chamfering angle of the side surface on the shaft pull-out side, one retaining ring engaging groove is structured so that the shaft can be extracted from the shaft mounting member. The retaining ring engaging groove can be structured to prevent the shaft from coming off from the shaft mounting member. Therefore, parts can be made common in both specifications of the structure in which the shaft can be removed from the shaft-mounted member and the structure in which the shaft cannot be removed from the shaft-mounted member, and the number of parts management man-hours can be reduced.

  The shaft further includes a stopper that defines a position at which the shaft is inserted into the shaft-mounted member, and the shaft corresponds to a plurality of retaining ring engaging grooves of the shaft-mounted member in a state where the shaft is inserted at the position defined by the stopper. In the case where each has a retaining ring mounting groove, the position where the shaft is inserted into the shaft-mounted member is defined by the stopper. For this reason, the retaining ring engaging groove into which the retaining ring mounted on the shaft fits is determined by selecting which retaining ring mounting groove of the shaft is to be fitted, and the fitting force between the shaft and the shaft mounting member is determined. Can be adjusted. In this case, the parts of the shaft and the shaft-mounted member can be shared, and the number of parts management man-hours can be reduced.

  Hereinafter, a shaft fitting structure according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the shaft fitting structure 10 includes shafts 11a and 11b, a retaining ring 12, and a shaft mounting member. In this embodiment, although not shown in the drawings, the example is applied to a structure in which the shafts 11a and 11b are fitted to the inner joint member 14 of the constant velocity universal joint. The inner joint member 14 of the speed universal joint, and the members corresponding to the shaft are the shafts 11a and 11b connected to the inner joint member 14 of the constant velocity universal joint.

  Retaining rings 21 and 22 are formed on the outer peripheral surface of the shafts 11a and 11b. The inner joint member 14 is formed with an insertion hole 23 into which the shafts 11a and 11b are inserted. In this embodiment, two types of shafts are prepared. As shown in FIG. 1, the first shaft 11 a is provided with a retaining ring mounting groove 21 at a position corresponding to an intermediate portion of the insertion hole 23 of the inner joint member 14. As shown in FIG. 2, the second shaft 11 b is provided with a retaining ring mounting groove 22 at a position corresponding to the back side of the insertion hole 23 of the inner joint member 14.

  As shown in FIGS. 1 and 2, splines 25 and 26 are formed on the outer peripheral surfaces of the end portions of the shafts 11a and 11b and the inner peripheral surface of the insertion hole 23 of the inner joint member 14, respectively. Torque is transmitted via 25 and 26. The retaining ring mounting grooves 21 and 22 of the shafts 11a and 11b are formed annularly in the circumferential direction across the splines 25 of the shafts 11a and 11b. The retaining ring mounting grooves 21 and 22 have a required depth with respect to the retaining ring 12 so that the retaining ring 12 can be hidden in the retaining ring mounting grooves 21 and 22 when the mounted retaining ring 12 is reduced in diameter. It has.

  Further, in this embodiment, the shafts 11 a and 11 b are provided with a stopper 27 that defines a position to be inserted into the inner joint member 14. In this embodiment, the stopper 27 is configured by a step at a portion where the outer diameters of the shafts 11 a and 11 b are increased on the proximal end side of the spline 25. As shown in FIGS. 3 and 4, the stopper 27 hits the opening end 28 of the insertion hole 23 when the shafts 11 a and 11 b are inserted into the insertion hole 23 of the inner joint member 14, so that the shafts 11 a, 11 b, and 11 c A position to be inserted into the inner joint member 14 is defined.

  The retaining ring 12 is a member that is mounted in the retaining ring mounting grooves 21 and 22 of the shafts 11a and 11b so that the diameter can be elastically reduced. In this embodiment, the retaining ring 12 is a ring-shaped member with a circular cross section and a part cut away. The retaining ring 12 is exposed to a predetermined amount of the outer peripheral edge from the retaining ring mounting grooves 21 and 22 mounted in a state where the force for reducing the diameter is not applied (free state). 22 has a predetermined outer shape that enters the inner surface side.

  The inner joint member 14 as a shaft-mounted member is formed with an insertion hole 23 into which the shafts 11a and 11b are inserted. When the shafts 11a and 11b and the inner joint member 14 are fitted to the opening end portion 28 of the insertion hole 23 of the inner joint member 14, the retaining ring 12 attached to the shafts 11a and 11b presses against the opening end portion 28. A chamfered inclined surface is formed so as to reduce the diameter of 12.

  As shown in FIGS. 1 and 2, two retaining ring engagement grooves 31 and 32 corresponding to the retaining ring mounting grooves 21 and 22 of the shafts 11 a and 11 b are formed on the inner peripheral surface of the insertion hole 23. . In this embodiment, the retaining ring engaging grooves 31, 32 correspond to the retaining ring mounting grooves 21, 22 of the shafts 11a, 11b in two places (in the illustrated example, the insertion hole 23 of the inner joint member 14). It is formed in the middle part and the back part of the insertion hole 23.

  In this embodiment, the retaining ring engagement grooves 31 and 32 are formed as grooves that are continuous in the circumferential direction on the inner peripheral surface of the insertion hole 23 of the inner joint member 14. The shaft pull-out side surfaces 33 and 34 of the retaining ring engagement grooves 31 and 32 have inclined surfaces formed by chamfering.

  Depending on the inclination angle of the shaft pull-out side surfaces 33 and 34, when the shaft is pulled with a predetermined force or more, the retaining ring 12 fitted in the retaining ring engagement grooves 31 and 32 is connected to the shaft pull-out side surface 33. , 34 can be reduced in diameter along the retaining ring engaging grooves 31, 32. Further, if the inclination of the shaft pull-out side surfaces 33 and 34 is tightened, the force necessary for pulling the shaft and reducing the diameter of the retaining ring 12 fitted in the retaining ring engaging grooves 31 and 32 also increases. When the shaft pull-out side surfaces 33 and 34 are inclined more than a predetermined inclination, the retaining ring 12 fitted in the retaining ring engaging grooves 31 and 32 does not reduce the diameter even if the shaft is pulled, and the shaft does not come off. Can be. Such an inclination angle may be set so as to perform a desired function by conducting an experiment or the like in advance.

  In this embodiment, the inclination angle α of the shaft pull-out side surface 33 of the retaining ring engaging groove 31 formed in the intermediate portion of the insertion hole 23 is such that the retaining ring engaging groove when the shaft is pulled with a predetermined force or more. The retaining ring 12 fitted to 31 is configured to be reduced in diameter along the shaft pull-out side surface 33 and detached from the retaining ring engaging groove 31. On the other hand, the inclination angle β of the shaft pull-out side surface 34 of the retaining ring engaging groove 32 formed in the inner part of the insertion hole 23 is more inclined and fits into the retaining ring engaging groove 32 even when the shaft is pulled. The retaining ring 12 does not reduce its diameter and prevents the shaft from coming off.

  Further, as shown in FIG. 5, the retaining ring engaging groove 31 formed in the intermediate portion of the insertion hole 23 has an inclined surface formed on the shaft insertion side surface 35 by chamfering. The inclination angle γ of the shaft insertion side surface 35 is such that when the shaft 11b is pushed with a predetermined force or more so that the insertion of the shaft 11b is not hindered, the retaining ring 12 has a shaft difference of the retaining ring engaging groove 31. The diameter of the retaining ring 12 is reduced by coming into contact with the insertion side surface 35 so that the retaining ring 12 is detached from the retaining ring engaging groove 31. Thereby, even when the retaining ring 12 mounted on the distal end side of the shaft 11b fits into the retaining ring engaging groove 31 formed in the intermediate portion of the insertion hole 23, the retaining ring 12 is inserted into the retaining ring engaging groove 31. The shaft 11b can be inserted further into the back.

  As shown in FIGS. 1 and 2, the shaft fitting structure 10 uses any one of the shafts 11 a and 11 b, so that any of the retaining ring engagement grooves 31 and 32 of the inner joint member 14 can be engaged. Whether or not the retaining ring 12 is engaged with the groove is determined, whereby the fitting force between the shafts 11a and 11b and the inner joint member 14 can be adjusted.

  Specifically, as shown in FIG. 3, when the shaft 11 a in which the retaining ring mounting groove 21 is formed in the intermediate portion is used, the retaining ring 12 attached to the shaft 11 a is in the middle portion of the insertion hole 23. It fits in the retaining ring engaging groove 31. In this case, the fitting force between the shaft 11a and the inner joint member 14 is a force corresponding to the force with which the retaining ring 12 and the retaining ring engaging groove 31 interfere when the shaft 11a is pulled. The inclination angle α of the shaft withdrawal side surface 33 of the retaining ring engaging groove 31 is such that the retaining ring 12 fitted in the retaining ring engaging groove 31 when the shaft 11a is pulled with a predetermined force or more is applied to the shaft withdrawal side. Since the diameter of the shaft 11a is reduced along the side surface 33 and the retaining ring engaging groove 31 is detached, the shaft 11a and the inner joint member 14 are separable.

  Further, as shown in FIG. 4, when the shaft 11b having the retaining ring mounting groove 22 formed on the tip side is used, the retaining ring 12 mounted on the shaft 11b is engaged with the retaining ring on the back side of the insertion hole 23. Fits into the groove 32. In this case, the fitting force between the shaft 11b and the inner joint member 14 is a force corresponding to the force with which the retaining ring 12 and the retaining ring engaging groove 32 interfere when the shaft 11b is pulled. The inclination angle β of the shaft withdrawal side surface 34 of the retaining ring engaging groove 32 is more inclined, and even if the shaft 11b is pulled, the retaining ring 12 fitted in the retaining ring engaging groove 32 is not reduced in diameter. Since the shaft 11b cannot be removed, the shaft 11b and the inner joint member 14 cannot be separated.

  As described above, according to the shaft fitting structure 10, the inner joint member 14 is used in common, and the shafts 11 a and 11 b are selectively used, so that the shafts 11 a and 11 b and the inner joint member 14 can be separated from each other. Or make it possible.

  Further, as shown in FIG. 6, the retaining ring mounting groove 21 is provided at a position corresponding to the plurality of retaining ring engaging grooves 31, 32 of the inner joint member 14 in a state where it is inserted into the position defined by the stopper 27. , 22 may be used. In this case, the fitting force between the shaft 11c and the inner joint member 14 when inserted into the insertion hole 23 can be adjusted depending on which retaining ring mounting grooves 21 and 22 of the shaft 11c are mounted with the retaining ring 12.

  For example, as shown in FIG. 6, when the retaining ring 12 is mounted in the retaining ring mounting groove 21 formed in the intermediate part of the shaft 11 c, the retaining ring 12 is engaged with the retaining ring at the intermediate part of the insertion hole 23. Engage with the groove 31. The inclination angle α of the side surface 33 on the shaft withdrawal side of the retaining ring engaging groove 31 is such that the retaining ring 12 fitted in the retaining ring engaging groove 31 when the shaft 11c is pulled with a predetermined force or more is The diameter is reduced along the side surface 33 so as to be detached from the retaining ring engaging groove 31. For this reason, the shaft 11c and the inner joint member 14 have a separable structure.

  On the other hand, as shown in FIG. 7, when the retaining ring 13 is mounted in the retaining ring mounting groove 22 formed on the inner side of the shaft 11 c, the retaining ring 13 is engaged with the retaining ring on the inner side of the insertion hole 23. Engage with the mating groove 32. The inclination angle β of the side surface 34 of the retaining ring engaging groove 32 on the shaft pull-out side is so tight that the retaining ring 13 fitted in the retaining ring engaging groove 32 is pulled even if the shaft 11c is pulled with a predetermined force or more. Is not reduced in diameter and the shaft 11c is not pulled out. For this reason, the shaft 11c and the inner joint member 14 have a structure that cannot be separated.

  Thus, according to the shaft fitting structure 10 using this shaft 11c, the shaft 11c and the inner joint member 14 are made common, and which of the plurality of retaining ring mounting grooves 21, 22 of the shaft 11c, which retaining ring mounting groove. The fitting force between the shaft 11c and the inner joint member 14 can be adjusted depending on whether the retaining ring 12 is attached to the shaft 11c. Thereby, since the parts of the shaft 11c and the inner joint member 14 can be shared, the number of parts management man-hours can be reduced.

  As mentioned above, although the shaft fitting structure concerning one embodiment of the present invention was explained, the shaft fitting structure concerning the present invention is not limited to the above-mentioned embodiment.

  For example, in the above embodiment, the shaft fitting structure is applied to the fitting structure of the inner joint member of the constant velocity universal joint and the shaft attached to the inner joint member. The application to which the joint structure is applied is not limited to the fitting structure of the inner joint member of the constant velocity universal joint and the shaft fitted to the inner joint member, and widely fits the shaft and the shaft-mounted member. Applicable to structure. The constant velocity universal joint is not limited to a fixed type constant velocity universal joint, and may be a sliding type constant velocity universal joint such as a double offset type, a cross groove type, or a tripod type. As the inner joint member of the constant velocity universal joint, the shaft-mounted member into which the shaft is fitted includes an inner joint member in a double offset type or a cross groove type, or a trunnion in a tripod type. .

  The number of retaining ring engaging grooves formed in the insertion hole of the shaft-mounted member can be increased without being limited to two. Further, the number of retaining ring engaging grooves formed in the insertion hole of the shaft receiving member is increased, and the inclination angle of the side surface of the retaining ring engaging groove on the shaft pulling side is appropriately adjusted to a different angle. The degree of freedom in adjusting the fitting force with the shaft mounting member can be improved.

  In addition, as shown in FIGS. 6 and 7, in the case of using a shaft having a retaining ring mounting groove at a position corresponding to a plurality of retaining ring engaging grooves of the shaft mounted member, insertion of the shaft mounted member is performed. The number of retaining ring mounting grooves formed in the shaft may be increased in accordance with the increase in the number of retaining ring engaging grooves formed in the hole. Accordingly, by changing the position where the retaining ring is mounted in the retaining ring mounting groove of the shaft, the fitting force between the shaft and the shaft mounting member can be adjusted, and the degree of freedom of the adjustable fitting force is improved.

  Further, the structure of the stopper that defines the position where the shaft is inserted into the shaft-mounted member is not limited to that of the above-described embodiment. For example, as shown in FIG. 8, an annular stopper is mounted at an appropriate position of the shaft 11d. A structure may be provided in which a groove 41 is formed and a ring-shaped stopper 43 that is brought into contact with the opening edge portion 42 of the insertion hole 23 is mounted, and although illustration is omitted, protrusions such as bolts are provided at appropriate positions on the shaft. The shaft may be structured to define the position where the shaft is inserted into the insertion hole of the shaft-mounted member.

  Moreover, the cross-sectional shape of the retaining rings 12 and 13 is not limited to a circular shape, and may be any shape in a structure that can fit the shaft and the inner joint member, such as a square shape, a trapezoidal shape, and an elliptical shape.

The longitudinal section side view showing the state before inserting a shaft by the shaft fitting structure concerning one embodiment of the present invention. The longitudinal section side view showing the state before inserting a shaft by the shaft fitting structure concerning one embodiment of the present invention. The longitudinal section side view showing the state where the shaft was made to fit in the shaft fitting structure concerning one embodiment of the present invention. The longitudinal section side view showing the state where the shaft was made to fit in the shaft fitting structure concerning one embodiment of the present invention. The longitudinal section side view showing the shaft fitting structure concerning one embodiment of the present invention. The vertical side view which shows the modification of a shaft by the shaft fitting structure which concerns on one Embodiment of this invention. The vertical side view which shows the modification of a shaft by the shaft fitting structure which concerns on one Embodiment of this invention. The vertical side view which shows the modification of a stopper with the shaft fitting structure which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shaft fitting structure 11a, 11b, 11c, 11d Shaft 12 Retaining ring 14 Inner joint member (shaft mounting member)
21 and 22 Retaining ring mounting groove 23 Insertion holes 25 and 26 Spline 27 Stopper 28 Insertion hole opening end portions 31 and 32 Retaining ring engaging grooves 33 and 34 Shaft extraction side surface 35 Shaft insertion side surface 41 Stopper mounting groove 42 Opening Edge 43 Stopper α Inclination angle β Inclination angle γ Inclination angle

Claims (2)

A shaft having a retaining ring mounting groove formed on the outer peripheral surface;
A retaining ring mounted on the retaining ring mounting groove of the shaft so that the diameter can be elastically reduced;
A shaft-mounted member in which an insertion hole into which the shaft is inserted is formed;
A retaining ring mounted in a retaining ring mounting groove of the shaft is fitted on the inner peripheral surface of the insertion hole, and a plurality of retaining ring engaging grooves are chamfered at different angles on the side of the shaft withdrawal side. Shaft fitting structure.   The shaft includes a stopper that defines a position where the shaft is inserted into the shaft-mounted member, and the shaft corresponds to a plurality of retaining ring engaging grooves of the shaft-mounted member when inserted into the position defined by the stopper. The shaft fitting structure according to claim 1, further comprising a retaining ring mounting groove at each of the positions.

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