JP2016065561A - Stopper prevention structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stopper prevention structure capable of realizing stopping state effectively in which the stopper pin is prevented from being pulled off.SOLUTION: There are provided a shift-and-select shaft 1 having a fixing part 11; an inner lever 2 having a fixing hole 2a fitted to an outer periphery of the fixing part 11; and a stopper pin 3 for connecting between the fixing part 11 and the inner lever 2 when the fixing part 11 is fitted to the fixing hole 2a. An insertion hole 20 into which the stopper pin 3 arranged at the inner lever 2 is inserted includes an approaching part 22 that is a part of an inside in a radial direction including a part contacted with the outer periphery of the fixing part 11 and approaches the stopper pin 3 and an expanded diameter part 21 that is a residual part from outside and expanded more at its diameter than that of the approaching part so as not to be closely contacted with the stopper pin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a retaining structure that prevents one from slipping out of the other between two members.

  Conventionally, various structures have been proposed for fixing two members. For example, when a fork is fixed to a fork shaft or an inner lever is fixed to a shift and select shaft in a vehicle transmission, after one member is spline-fitted to the other member, a retaining pin is passed through both Is inserted into the through hole.

  Here, the retaining pin is securely inserted between the two members by being press-fitted into the through hole. In that case, a slotted pin that can be enlarged or reduced in the radial direction may be employed as the retaining pin (Patent Document 1, etc.).

JP 2008-32167 A JP 2010-65730 A

  However, the retaining pin sometimes comes off in an unexpected direction with use.

  The present invention has been completed in view of the above circumstances, and an object to be solved is to provide a retaining structure capable of effectively retaining the retaining pin itself even with a simple configuration.

  As a result of intensive investigations aimed at solving the above-mentioned problems, the present inventors have obtained the following knowledge, and have completed the present invention based on the knowledge.

  The through-holes provided in the two members and the retaining pins are not necessarily formed with such an accuracy that they are in close contact with each other, and it is normal that the portions that contact each other vary.

  For example, as shown in FIG. 6, in the prior art, the through hole 910 provided in the shift and select shaft 91 may be formed to be shifted from the through hole 920 provided in the inner lever (in FIG. 6). (Upper drawing)

  In FIG. 6, when the inner lever 92 is fixed to the shift and select shaft 91, a spline is formed in a fixing portion of the shift and select shaft 91 and a fixing hole provided in the inner lever 92 to perform spline fitting. The shift and select shaft 91 and the inner lever 92 form through holes 910 and 920 into which the retaining pins 93 can be inserted when they are spline-fitted.

  The retaining pin 93 is a slotted pin, and its diameter can be reduced according to an external force. A case where the through-holes 910 and 920 are biased upward in the drawing is assumed below for some reason.

  After the fixing portion of the shift and select shaft 91 is inserted into the fixing hole of the inner lever 92, when the retaining pin 93 is inserted from the right side of the drawing, the retaining pin 93 is inserted into the shift and select shaft 91 from the through hole 920 of the inner lever 92. The tip of the through hole 910 moves with a reduced diameter, and then is displaced upward.

  Even when the retaining pin 93 is advanced as it is and moved from the through hole 910 to the through hole 920, the tip diameter is reduced. As a whole, the retaining pin 93 roughly follows the shape of the through-holes 910 and 920, the center swells upward in the drawing, and both ends are displaced downward in the drawing (FIG. 6).

  As a result, the retaining pin 93 and the through-hole 920 of the inner lever 92 are in contact with each other at the portion A and the portion B on the left side of the drawing, and at the portion C and the portion D on the right side of the drawing.

  In this case, relative movement as shown in FIG. 7 (shift-and-select shaft 91 is clockwise I in the drawing and inner lever 92 is counter-clockwise II in the drawing) between the shift-and-select shaft 91 and the inner lever 92 is performed. The case where it is made to explain is demonstrated.

  On the right side of the drawing, a force is applied from the inner lever 92 to the retaining pin 93 at the portion C, and the retaining pin 93 is shifted from the shift and select shaft 91 to a through hole 920 provided in a fixing portion of the shift and select shaft 91. However, a force is applied on the upper side of the drawing (the outer periphery of the fixed portion) that opens to the left side of the drawing.

  Then, since the part C of the shift and select shaft 91 is away from the outer periphery of the fixing part, on the right side of the drawing, the force applied from the part C with the clockwise turning of the inner lever 92 causes the retaining pin 93 to be fixed. A bending moment is generated that turns counterclockwise about a portion that contacts the outer periphery of the pin, and as a result, a force is applied in a direction to move the lower side of the retaining pin 93 to the right in the drawing.

  On the left side of the drawing on the opposite side, force is applied to the retaining pin 93 from the inner lever 92 at the portion B, and the retaining pin 93 is provided on the fixing portion of the shift and select shaft 91 from the shift and select shaft 91. A force is applied to the lower side of the drawing at the end (the outer periphery of the fixed portion) where the through hole 920 opens to the left side of the drawing.

  Since the portion B of the shift and select shaft 91 substantially coincides with the outer periphery of the fixed portion, no turning force is generated in the retaining pin 93 as the inner lever 92 turns clockwise on the left side of the drawing.

  As a result, a force imbalance occurs at portions corresponding to the left and right sides of the drawing, and a force that moves the retaining pin 93 to the right side of the drawing is applied. When rotating in the opposite direction, a force that moves in the opposite direction is applied to the retaining pin 93.

  As shown in FIG. 6, when the through hole 910 is displaced as a whole with respect to the through hole 920, a force is applied to the retaining pin 93 as described above, but the displacement between the through holes 910 and 920 is not improved. The direction and magnitude of the force applied to the retaining pin 93 cannot be controlled depending on the degree and direction.

  As described above, when relative rotation between the inner lever 92 and the shift-and-select shaft 91 is applied, a force that moves rightward or leftward is generated in the retaining pin 93, and this force is generated by the retaining pin 93 and the through holes 910 and 920. When the frictional force between them is overcome, the retaining pin 93 moves in that direction. In this way, it has been found that the retaining pin 93 moves while being repeatedly repeated many times.

  That is, the magnitude and direction of the force applied to the retaining pin 93 depends on the magnitude and balance of the distance from the outer periphery of the fixed portion of the shift and select shaft 91 to the portion where the through hole 920 provided in the inner lever 92 contacts the retaining pin 93. It turns out that it is decided.

  From the above results, it was discovered that the direction in which the retaining pin 93 was not able to be controlled in the prior art was that the position where the retaining pin 93 and the through holes 910 and 920 were in contact could not be controlled.

  Therefore, in the present invention, the position where the retaining pin 93 and the through holes 910 and 920 are in contact is limited to a narrow range, thereby controlling the force applied to the retaining pin and suppressing the retaining pin from coming off.

  Although Patent Document 2 does not intend to solve such a problem, the circumferential direction (direction perpendicular to the axial direction) of the shift-and-select shaft becomes longer as a through hole into which the retaining pin is inserted. The form which employs a long hole is disclosed. Even if the shift-and-select shaft is rotated by using a long hole in the circumferential direction, the retaining pin does not come into contact with the through hole formed in the inner lever, and it is estimated that no biasing force is applied to the retaining pin. The

However, the long hole as in Patent Document 2 becomes a cause of cost increase because of complicated processing. Therefore, a structure that can achieve the same effect with a simple configuration is required.
(1) A retaining structure according to the present invention that solves the above problems includes a first structure portion having a substantially cylindrical fixing portion, a second structure body having a fixing hole fitted to the outer periphery of the fixing portion, and A retaining pin disposed so as to connect the fixing portion and the second structure toward the radial direction of the fixing portion when the fixing portion is fitted in the fixing hole;
The insertion hole into which the retaining pin provided in the second structure is inserted is a part on the radially inner side including a portion in contact with the outer periphery of the fixed portion, and a proximity portion close to the retaining pin, And a diameter-enlarged portion that is a remaining portion from the outside and is larger in diameter than the adjacent portion so as not to be in close contact with the retaining pin.

  By adjusting the inner diameter of the insertion hole provided in the second structure, the range (blurring range) in which the portion where the inner wall of the insertion hole formed in the second structure comes into contact with the retaining pin is fluctuated is reduced. Thus, it is possible to reduce the force (the force applied in the direction in which the retaining pin is pulled out) due to the bending moment applied to the retaining pin due to the imbalance of the contact portion.

At least one of the configurations (2) to (4) described below can be added to the configuration (1) described above.
(2) The proximity portion is only a portion in contact with the outer periphery of the fixed portion. Since the portion of the insertion hole formed in the second structure that contacts the retaining pin can be defined in the length direction of the retaining pin, the force applied to the retaining pin can also be defined, and the retaining pin itself The force applied in the direction of withdrawal can be controlled appropriately.
(3) The retaining pin can be elastically deformed in the radial direction. Since the retaining pin can be expanded and contracted in the radial direction, the range in which the retaining pin can contact the inner wall of the insertion hole is expanded, and an imbalance of the force applied to the retaining pin can be suppressed. Such a retaining pin is known as a slotted pin.
(4) The fixing portion is in close contact with the retaining pin at least in the vicinity of the fixing hole. When the insertion hole formed in the fixing portion is also brought into contact with the vicinity of the fixing hole, which is a part in contact with the second structure, a bending moment is hardly generated in the retaining pin, and a force in the direction in which the retaining pin is removed is applied. Can be suppressed.

It is sectional drawing of the shift and select shaft and inner lever which employ | adopted the retaining structure in embodiment. It is sectional drawing of the shift-and-select shaft in the fall prevention structure in embodiment. It is an inner lever sectional view in an anti-separation structure in an embodiment. FIG. 3 is a partially enlarged view of a shift and select shaft and an inner lever that employ a retaining prevention structure according to an embodiment. It is sectional drawing when there is a shift | offset | difference in the insertion hole formed with the shift and select shaft and inner lever which employ | adopted the retaining structure in embodiment. It is sectional drawing in the case where there is a shift | offset | difference in the insertion hole formed with the shift and select shaft and inner lever which employ | adopted the conventional retaining structure. It is sectional drawing when force is applied to the retaining pin when there is a shift in the insertion hole formed of the shift and select shaft and inner lever employing the conventional retaining structure.

  The retainer prevention structure of the present invention will be described in detail based on the following embodiments. The retaining structure according to the present embodiment prevents the first structure and the second structure from being unfixed in the structure in which the first structure and the second structure are fixed by a retaining pin. Therefore, it has a retaining structure that prevents the retaining pin from coming off. In the following embodiments, description will be made based on what is adopted as a component in a transmission mounted on a vehicle. Specifically, the first structure is a shift and select shaft, and the second structure is an inner lever. The shift and select shaft constitutes a part of a transmission mounted on the vehicle. For example, in a manual transmission as a transmission, a shift operation is performed by converting the movement of a shift lever into an axial movement and a rotation direction of a shift and select shaft.

  As shown in FIG. 1, an inner shaft 2 as a second structure is fixed to a shift and select shaft 1 as a first structure. The shift and select shaft 1 is a rod-shaped member and has a cylindrical fixing portion 11. The inner lever 2 is formed with a fixing hole 2a into which the fixing portion 11 is inserted. The outer peripheral surface 12 of the fixing portion 11 and the inner peripheral surface 24 of the fixing hole 2a are formed with splines (not shown) that can mesh with each other, and in the engaged state, the shift and select shaft 1 and the inner lever 2 are in the axial direction. Even if the relative movement is freely possible, the relative rotation is impossible. The inner lever 2 has a tip portion 29 engaged with a fork head (not shown) to move a fork shaft provided with the fork head.

  Insertion holes 10 and 20 are formed so that the retaining pin 3 can be inserted through the shift and select shaft 1 and the inner lever 2 in combination. In the present embodiment, the insertion holes 10 and 20 have a circular cross section.

  The retaining pin 3 is a pin formed by rolling a plate-like body so that the cross section is C-shaped, and is a pin whose diameter can be elastically deformed and reduced according to the inner diameter of the inserted hole. 10 and 20, the relative movement in the axial direction between the shift and select shaft 1 and the inner lever 2 is restricted.

  The insertion hole 10 has an inner diameter that is slightly smaller than the outer diameter of the retaining pin 3 before insertion, and the retaining pin 3 is reduced in diameter by being inserted and is in close contact with the inner wall of the insertion hole 10. The insertion hole 20 has a proximity portion 22 that can be in close contact with the retaining pin 3 at a location close to the outer peripheral surface 12 of the shift and select shaft 1. The proximity portion 22 corresponds to the close contact portion of the present invention. A part of the proximity portion 22 may be in close contact with the proximity portion 22 and the retaining pin 3. In particular, it is desirable that only the portion in contact with the outer peripheral surface 12 of the fixing portion 11 is the proximity portion 22 in order to preferably act as a close contact portion. Specifically, it is desirable to reduce the length of the proximity portion 22 in the axial direction (axial direction with reference to the shift and select shaft 1). For example, the upper limit of the length in the axial direction of the portion closely contacting the retaining pin 3 as the proximity portion 22 is a value such as 1 mm, 0.75 mm, 0.5 mm, 0.25 mm, 0.1 mm, 0.05 mm, or the proximity portion. Values such as 0.5 times, 0.4 times, 0.3 times, 0.2 times, 0.1 times, and 0.05 times the diameter of 22 can be adopted. By reducing this value, it is possible to narrow the range in which the portion where the retaining pin 3 and the proximity portion 22 are in close contact with each other occurs. On the contrary, increasing the strength improves the strength of the proximity portion 22. it can.

  Regarding the relationship between the inner diameter of the proximity portion 22 and the inner diameter of the insertion hole 10 provided in the fixed portion 11, the insertion holes 10 and 20 are shifted so that the retaining pin 3 can be in close contact with the inner wall of the proximity portion 22. When not, it is necessary to make the inserted retaining pin 3 the same as the inner diameter of the proximity portion 22.

  Parts other than the proximity part 22 of the insertion hole 20 constitute an enlarged diameter part 21 having an inner diameter larger than that of the proximity part 22. When the retaining pin 3 is inserted into the insertion hole 20, the retaining pin 3 is reduced in diameter at the proximity portion 22. Therefore, the retaining pin 3 does not contact the inner wall of the enlarged diameter portion 21. In the drawings, the difference in inner diameter between the proximity portion 22 and the enlarged diameter portion 21 is depicted very large for ease of understanding, but a slight difference in inner diameter is necessary in order to achieve the effect in the present embodiment. Often it is sufficient. For example, when the size of the displacement that is expected to occur at the maximum in the insertion holes 10 and 20 is small, the inner diameter difference can be reduced.

-Effects Since the retaining structure of the present embodiment has the above-described configuration, the following effects can be achieved.

  The shift and select shaft 1 is fitted by a spline provided in the fixing portion 11 and the fixing hole 2a of the inner lever 2, and relative rotation in the direction around the axis of the shift and select shaft 1 is restricted. The relative movement between the shift and select shaft 1 and the inner lever 2 is restricted by inserting the retaining pin 3.

  Here, as shown in FIG. 5, the case where the positions where the insertion holes 10 and 20 are formed are displaced for some reason will be described. Although there is no particular limitation for some reason, it can be assumed that it is caused by the accuracy of an apparatus for processing. Although FIG. 5 shows a state in which the insertion hole 10 provided in the shift and select shaft 1 is formed so as to be shifted upward from the insertion hole 20 provided in the inner lever 2, the explanation is easy. Thus, the size of the shift is exaggerated. Even if there is actually almost no deviation, the effects of the present embodiment can be exhibited even when there is a deviation that can change the degree of contact between the insertion holes 10 and 20 and the retaining pin 3.

  As shown in FIG. 5, the insertion hole 10 is displaced from the insertion hole 20 in the upper part of the drawing, so that the retaining pin 3 inserted has a central part moved upward in the drawing and both end parts moved downward in the drawing. As a whole, the center portion is bent so as to protrude upward in the drawing. By adopting the configuration of the present embodiment, even if the retaining pin 3 is bent, a portion where the retaining pin 3 and the inner peripheral surface of the fixing hole 2a provided in the inner lever 2 are in contact is represented by the proximity portion 22. A to D, and the distance from the outer periphery of the fixed portion 11 of the shift and select shaft 1 is substantially constant regardless of the degree of bending of the retaining pin 3 (that is, the displacement of the insertion holes 10 and 20). it can. That is, the variation in the positions A to D can be reduced depending on how far the proximity portion 22 is formed from the outer periphery of the fixed portion 11 and how much the proximity portion 22 is formed from the outer periphery of the fixed portion 11. In particular, the proximity portion 22 is preferably formed so as to be in contact with the outer periphery of the fixed portion 11 from the viewpoint of ease of manufacture.

  As a result, when the shift and select shaft 1 rotates, when a force is applied in the direction of relative rotation with the inner lever 2, the inner lever is rotated even if it is slightly rotated due to the gap of the spline fitting. The portion where 2 applies a force to the retaining pin 3 can be controlled in the vicinity of the outer periphery of the fixed portion 11 of the shift and select shaft 1 regardless of the magnitude of the shift between the insertion holes 10 and 20. Thus, the stress imbalance as described in the prior art does not occur, and a large axial force is not applied to the retaining pin 3, so that the retaining pin 3 can be removed from the insertion holes 10 and 20. It can be prevented from coming off.

  Further, since the insertion hole 20 has a circular cross section in the direction perpendicular to the axial direction, it is easier to process than the long hole.

DESCRIPTION OF SYMBOLS 1,91 ... Shift and select shaft (1st structure) 10 ... Insertion hole 11 ... Fixing part 2,92 ... Inner lever (2nd structure) 20 ... Insertion hole 21 ... Diameter expansion part 22 ... Proximity part 3,93 ... Retaining pin (slotted pin)

Claims (4)

A first structure portion having a substantially cylindrical fixing portion, a second structure body having a fixing hole fitted to the outer periphery of the fixing portion, and the fixing portion when the fixing portion is fitted in the fixing hole. A retaining pin disposed so as to connect the fixing portion and the second structure toward the radial direction,
The insertion hole into which the retaining pin provided in the second structure is inserted is a part on the radially inner side including a portion in contact with the outer periphery of the fixed portion, and a proximity portion close to the retaining pin, A retaining structure having a diameter-enlarged portion which is a remaining portion from the outside and is larger in diameter than the adjacent portion so as not to be in close contact with the retaining pin.   2. The retaining structure according to claim 1, wherein the proximity portion is only a portion in contact with an outer periphery of the fixed portion.   The retaining structure according to claim 1 or 2, wherein the retaining pin is elastically deformable in a radial direction.   The retaining structure according to any one of claims 1 to 3, wherein the fixing portion is in close contact with the retaining pin at least in the vicinity of the fixing hole.

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