JP6662183B2 - Press-in jig - Google Patents

Description

  The present invention relates to a press-fitting jig, and more particularly to a press-fitting jig for coaxially press-fitting an annular plate to an annular member.

  For example, there is a case where an annular plate is coaxially press-fitted into an annular member such as a hub which is a component part of a vehicle transmission. In particular, there is a case where a second cylindrical surface formed coaxially with the center of the annular plate is coaxially press-fitted around a first cylindrical surface formed coaxially with the front end surface of the annular member.

JP 2014-46415 A

  Generally, such a press fit is performed by simply pressing the annular plate toward the annular member. However, in this case, the second cylindrical surface may be obliquely fitted to the first cylindrical surface, may not be properly fitted, and may cause problems such as the annular plate coming off later.

  Accordingly, the present invention has been made in view of such circumstances, and an object thereof is to provide a press-fitting jig capable of appropriately press-fitting a second cylindrical surface of an annular plate around a first cylindrical surface of an annular member. It is in.

According to one aspect of the present invention,
A press-fitting jig for coaxially press-fitting an annular plate to an annular member,
The annular member is coaxially fixed around a fixed axis, and the fixed axis has a center hole coaxially on a front end face located in the axial front thereof,
The annular member has a first cylindrical surface on its front end surface coaxially,
The annular plate has a second cylindrical surface coaxially at its center,
The press-fitting jig is adapted to press-fit the second cylindrical surface coaxially around the first cylindrical surface,
The press-fitting jig,
A centering pin inserted into the center hole of the fixed shaft;
A guide shaft fitted around the centering pin,
A press-fitting jig arranged so as to be slidable in the axial direction around the guide shaft, and configured to press a portion of the annular plate around the second cylindrical surface. Provided.

  Preferably, the center hole is a center hole formed during machining of the fixed shaft.

Preferably, the press-fitting tool is irremovably connected to the guide shaft, and is connected to the guide shaft so as to be extendable and contractible,
The press-fitting jig has an urging member for urging the press-fitting tool in an extending direction.

  Preferably, the annular member is a hub of a vehicle transmission, and the fixed shaft is a rotation shaft of the vehicle transmission.

  According to the present invention, the second cylindrical surface of the annular plate can be properly press-fitted around the first cylindrical surface of the annular member.

It is a perspective view which shows a hub, a countershaft, and an annular plate. It is sectional drawing which shows a hub, a counter shaft, an annular plate, and a press-fitting jig. FIG. 3 is a sectional view showing details of FIG. 2. It is sectional drawing which shows a comparative example.

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

  FIG. 1 shows an annular member and an annular plate to which the press-fitting jig according to the present embodiment is applied. In the present embodiment, the annular member is a hub (clutch hub) 1 as a component of a vehicle transmission (not shown). The hub 1 is coaxially fixed in advance around a rotation shaft, which is also a component of the vehicle transmission, in this embodiment, a counter shaft 2. An annular plate 3 is coaxially press-fitted into the hub 1.

  The vehicle transmission is a vehicle manual transmission. Such a transmission has various annular members and rotating shafts, and the present invention is applicable to any of them. For example, the rotation axis may be an input axis or an output axis. Further, for example, the annular member may be a gear fixed to the input shaft, a gear fixed to the counter shaft, or a gear fixed to the output shaft.

  In the present embodiment, the counter shaft 2 is already mounted on the transmission being assembled, and is fixed by appropriate means so as not to move with respect to the space. In this sense, the counter shaft 2 forms a fixed shaft referred to in the claims. However, the present invention is also applicable to a case where the fixed shaft is independently fixed to the space.

  With reference to the center axis C2 of the counter shaft 2, a direction along the center axis C2 is referred to as "axial direction". One end (upper side in FIG. 1) in the axial direction is “front”, and the other end (lower side in FIG. 1) is “rear”. However, this front-rear direction is merely defined for the sake of convenience for the sake of explanation, and does not always match the actual use situation. In the present embodiment, the components are arranged such that the upper side in the vertical direction is the front and the lower side is the rear.

  The front end of the counter shaft 2 protrudes forward from the hub 1, whereby a protrusion 4 is formed on the counter shaft 2. The counter shaft 2 has a center hole 6 coaxially on its front end face 5. The center hole 6 is a center hole that is formed in advance during machining of the counter shaft 2, particularly during cutting with a lathe. The front end face 5 is perpendicular to the axial direction.

  The hub 1 is formed in a substantially annular shape as a whole. The hub 1 has a first cylindrical surface 8 protruding forward coaxially and integrally with a front end surface 7 and a central portion thereof. The first cylindrical surface 8 has a constant radius based on the center axis C2. Further, the hub 1 integrally has a key 9 for fitting a coupling sleeve (not shown) movably in the axial direction on the outer peripheral surface thereof. As shown in FIG. 3, a front end annular surface 16 perpendicular to the axial direction is formed between the first cylindrical surface 8 and the hub center hole 15.

  Splines (not shown) extending in the axial direction are formed on the inner peripheral surface of the hub center hole 15 and the outer peripheral surface of the counter shaft 2, and the hub 1 is press-fitted around the counter shaft 2 while these splines are engaged with each other. Has been fixed.

  The annular plate 3 is formed in a substantially annular shape as a whole, and is integrally formed of a relatively thin metal plate. The annular plate 3 has a second cylindrical surface 10 coaxially and integrally at the center thereof. The second cylindrical surface 10 has a constant radius based on the central axis C2. The second cylindrical surface 10 is formed by bending the inner peripheral edge of the annular plate 3 forward by 90 °. A circular plate center hole 11 is formed radially inward of the second cylindrical surface 10. Further, the annular plate 3 has an outer cylindrical portion 12A formed by bending the outer peripheral edge thereof to the front by 90 °, and a flange portion 12B formed by bending the front end of the outer cylindrical portion 12A to the outer side in the radial direction by 90 °. And

  As will be described in detail later, the press-fitting jig according to the present embodiment is applied so that the second cylindrical surface 10 is coaxially press-fitted around the first cylindrical surface 8.

  FIG. 2 shows a configuration of the hub 1, the counter shaft 2, the annular plate 3, and the press-fitting jig 40. FIG. 3 shows details of FIG.

  As shown in FIG. 3, the first cylindrical surface 8 of the hub 1 has a constant radius R1 based on the center axis C2. On the other hand, the second cylindrical surface 10 of the annular plate 3 has a constant radius R2 based on the central axis C2. To achieve a press fit, radius R2 is made slightly smaller than radius R1.

  2 and 3 show a state after the press-fitting of the annular plate 3 is completed. At this time, the inner peripheral portion 13 of the rear surface of the annular plate 3 is pressed against the inner peripheral portion 14 of the front end surface of the hub 1. The front end face 7 of the hub 1 is formed in a stepped shape, and a portion on the outer peripheral side from the inner peripheral portion 14 of the front end face is located behind the inner peripheral portion 14 of the front end face.

  At the rear end of the first cylindrical surface 8 of the hub 1, a first round surface 8A having a predetermined radius of curvature r1 is formed. A second round surface 10D having a predetermined radius of curvature r2 is formed at the rear end of the second cylindrical surface 10 of the annular plate 3. The radius of curvature r2 of the second radius surface 10D is larger than the radius of curvature r1 of the first radius surface 8A. Thus, after the press-fitting is completed, the inner peripheral portion 13 on the rear surface of the annular plate 3 can be pressed against the inner peripheral portion 14 on the front end surface of the hub 1.

  The center hole 6 of the counter shaft 2 has a constant diameter hole 6B having a constant radius R3, and a tapered hole 6A connected to the front side or the hole entrance side of the constant diameter hole 6B and opened to the front end face 5. The diameter of the tapered hole 6A is increased toward the front side.

  Next, the configuration of the press-fitting jig 40 will be described.

  As shown in FIGS. 2 and 3, the press-fitting jig 40 includes a centering pin 41 inserted into the center hole 6 of the counter shaft 2, a guide shaft 42 fitted around the centering pin 41, and a guide. A press-fitting tool 43 slidably disposed about the shaft 42 in the axial direction and configured to press a peripheral portion 10 </ b> C of the second cylindrical surface 10 in the annular plate 3.

  As shown in FIG. 3, the centering pin 41 is located at the rear end, and is coaxially and slidably fitted into the fixed diameter hole 6B of the center hole 6. It is formed at a position in the axial direction between the front constant diameter portion 46 positioned coaxially and slidably in the guide center hole 45 of the guide shaft 42 and the rear constant diameter portion 44 and the front constant diameter portion 46. It has integrally with the enlarged diameter part 47 arranged in the tapered hole 6A.

  The rear constant diameter portion 44 has a radius R4 equal to or slightly smaller than the radius R3 of the constant diameter hole 6B. The front constant diameter portion 44 has a radius R6 equal to or slightly smaller than the radius R5 of the guide center hole 45.

  The guide shaft 42 is formed in a substantially hollow cylindrical shape whose rear end is substantially closed. The guide shaft 42 has a rear end surface 51 that is brought into surface contact with the front end surface 5 of the counter shaft 2 when fitted around the centering pin 41. A projecting cylindrical portion 52 is formed on the outer peripheral portion of the rear end surface 51 so as to project rearward and surround the front end of the counter shaft 2 with a slight gap. A guide surface 53 that guides the sliding movement of the press-fitting tool 43 in the axial direction is formed on the entire outer peripheral surface of the guide shaft 42.

  The press-fitting tool 43 is formed in a substantially hollow cylindrical shape whose front end is closed. At the rear end of the press-fitting tool 43, a pressing surface 54 that is pressed against the peripheral portion 10C of the annular plate 3 when the annular plate 3 is press-fitted is formed. On the front end face of the press-fitting tool 43, a convex portion 55 is formed at the center thereof, which receives an axially backward pressing force or impact force F from the outside when the annular plate 3 is press-fitted. At the front end and the rear end of the press-fitting tool 43, a front flange 56 and a rear flange 57 projecting outward in the radial direction are formed, so that the press-fitting tool 43 can be easily grasped between these flanges to improve operability. I have. At the time of press fitting, the rear flange 57 is in surface contact with the flange portion 12B of the annular plate 3 and stably supports the outermost peripheral portion of the annular plate 3.

  The press-fitting tool 43 is irremovably connected to the guide shaft 42 and is connected to the guide shaft 42 so as to be extendable and contractible. Further, the press-fitting jig 40 has a spring 60 as an urging member for urging the press-fitting tool 43 in the extending direction.

  That is, in the cylindrical portion 63 of the press-fitting tool 43 located between the front flange 56 and the rear flange 57, two elongated holes 61 extending in the axial direction are formed so as to penetrate at opposite angular positions. Bolts 62 are attached to the guide shaft 42 facing the outside through the elongated holes 61 from the outside in the radial direction. In the present embodiment, the bolt 62 is a hexagon socket head bolt, but the type of the bolt 62 can be arbitrarily changed. When the press fitting 43 extends to the maximum with respect to the guide shaft 42, the head 62 </ b> A of the bolt 62 is hooked on the rear end of the long hole 61, thereby preventing the two from coming off. Also, when the press fitting 43 contracts to the maximum with respect to the guide shaft 42, the head 62 </ b> A of the bolt 62 is hooked on the front end of the elongated hole 61, and the contraction movement is restricted.

  The spring 60 is formed of a coil spring, is coaxially disposed in a compressed state in the press fitting 43 and the guide shaft 42, and urges the two in a direction of separating them. Thus, the press-fitting tool 43 is urged in the extending direction with respect to the guide shaft 42.

  Next, a press-fitting method using the press-fitting jig 40 will be described.

  First, the counter shaft 2 and the hub 1 are held in a fixed state in advance, and the annular plate 3 is arranged on the hub 1. At this time, the annular plate 3 is placed around the first cylindrical surface 8 of the hub 1 in an initial state in which the second cylindrical surface 10 of the annular plate 3 is lightly fitted.

  Next, the centering pin 41 is inserted into the center hole 6 of the counter shaft 2 from the front and attached. When the rear constant diameter portion 44 of the centering pin 41 is fitted into the constant diameter hole 6B of the center hole 6, the centering pin 41 is firmly fitted to the center hole 6 without play, and the press-fitting jig is provided. The centering of 40 is performed. Note that centering refers to positioning the center axis of one member coaxially with the center axis of the other member.

  Next, the guide shaft 42 is centered by fitting the guide center hole 45 of the guide shaft 42 around the front constant diameter portion 46 of the centering pin 41 projecting forward from the front end face 5 of the counter shaft 2. Fit around the pin 41. At this time, since the front side constant diameter portion 46 and the guide center hole 45 are firmly fitted without rattling, the guide shaft 42 is firmly centered with respect to the centering pin 41 and the counter shaft 2 without rattling. .

  In addition, since the rear end face 51 of the guide shaft 42 is brought into surface contact with the front end face 5 of the countershaft 2, the centering of the guide shaft 42 is also reliably achieved.

  When the guide shaft 42 is fitted, the pressing surface 54 of the press-fitting tool 43 is lightly pressed against the peripheral portion 10 </ b> C located around the second cylindrical surface 10 of the annular plate 3. As a result, the spring 60 is slightly contracted, and the press fitting 43 is slightly contracted with respect to the guide shaft 42.

  From this state, a rearward pressing force or a striking force F is applied to the projection 55 of the press-fitting tool 43 from the outside. As a result, the press-in tool 43 slides rearward with respect to the guide shaft 42, and the pressing surface 54 of the press-in tool 43 strongly pushes the peripheral portion 10C of the annular plate 3 rearward.

  Thereby, the annular plate 3 moves rearward with respect to the hub 1 and moves to a state or a position after the press-fitting is completed as shown in FIGS. Then, the second cylindrical surface 10 of the annular plate 3 is strongly adhered to the first cylindrical surface 8 of the hub 1, and the press-fitting of the annular plate 3 is completed. At the same time, the inner peripheral portion 13 of the rear surface of the annular plate 3 is firmly pressed against the inner peripheral portion 14 of the front end surface of the hub 1 by the pressing surface 54 of the press fitting 43.

  At this time, since the press-fitting tool 43 slides in a state where the press-fitting tool 43 is centered with respect to the counter shaft 2, the press-fitting tool 43 does not deviate from the countershaft 2 during the movement. The shaft does not tilt or rattle with respect to the center axis C2 of the counter shaft 2. Therefore, the pressing surface 54 of the press-fitting tool 43 moves accurately in the axial direction while maintaining the state perpendicular to the axial direction, and presses the annular plate 3 uniformly in the circumferential direction. Therefore, the annular plate 3 is properly press-fitted coaxially and straightly without being obliquely fitted to the hub 1.

  Here, in a comparative example to which the present invention is not applied, as shown in a simplified FIG. 4, the annular plate 3 is press-fitted by a pressing tool 80 having a ring-shaped pressing surface without a centering function. . However, in this case, the pressing tool 80 is inclined with respect to the central axis C2 during the pressing, and the second cylindrical surface 10 is fitted obliquely to the first cylindrical surface 8 and may not be properly fitted.

  When fitted obliquely, the center hole 11 of the annular plate 3 is slightly deformed into an elliptical shape. Then, in this state, the annular plate 3 is apparently fixed to the hub 1. If the transmission is assembled to the vehicle in this state and the vehicle is running, there is a possibility that a problem such as the annular plate 3 coming off the hub 1 due to vibration or the like may occur.

  However, according to the present embodiment, since the centering pin 41 for centering the press-fitting tool 43 and thus the entire press-fitting jig 40 is provided, the press-fitting tool 43 is pressed against the annular plate 3 while maintaining the coaxial state. 3 can be properly press-fitted around the first cylindrical surface 8 of the hub 1. Therefore, it is possible to reliably press-fit the annular plate 3 to the hub 1 and avoid problems such as the annular plate 3 coming off later.

  In the present embodiment, since the centering is performed using the center hole 6 (center hole) formed at the time of machining the countershaft 2, it is not necessary to separately provide the center hole 6, and the operation process can be simplified.

  Since the press-fitting tool 43 is irremovably connected to the guide shaft 42, the handling of the press-fitting jig 40 becomes easy and the work becomes easy. Further, since the spring 60 for urging the press-fitting tool 43 in the extension direction is provided, the second cylindrical surface 10 of the annular plate 3 is lightly pressed against the first cylindrical surface 8 of the hub 1 when the press-fitting jig 40 is initially positioned. It is possible to facilitate the work and promote appropriate press-fitting.

  At the time of press-fitting, the rear flange 57 of the press-fitting tool 43 supports the flange 12B of the annular plate 3, so that the inclination of the annular plate 3 can also be suppressed.

  As described above, the embodiments of the present invention have been described in detail, but the present invention can be applied to other embodiments. For example, the annular member and the fixed shaft may be other than the hub and the rotating shaft of the vehicle transmission. The guide shaft may be solid and the centering pin may be hollow.

  In the above embodiment, the annular member (hub 1) is fixed to the fixed shaft (counter shaft 2) fixed to the space so as not to be able to move relatively. However, the annular member may be fixed to the fixed shaft at least in the press-fit direction of the annular plate, and may be movable in the counter-press-fit direction of the annular plate. Such “fixing” includes a mode in which the annular plate is fixed in the press-fitting direction and is movable in the counter-pressing-in direction.

  The embodiment of the present invention is not limited to the above-described embodiment, and includes all modifications, applications, and equivalents included in the concept of the present invention defined by the claims. Therefore, the present invention should not be construed as limiting, but can be applied to any other technology belonging to the scope of the concept of the present invention.

Reference Signs List 1 hub 2 counter shaft 3 annular plate 6 center hole 8 first cylindrical surface 10 second cylindrical surface 10C peripheral portion 40 press-in jig 41 centering pin 42 guide shaft 43 press-in tool 60 spring

Claims (4)

A press-fitting jig for coaxially press-fitting an annular plate to an annular member,
The annular member is coaxially fixed around a fixed axis, and the fixed axis has a center hole coaxially on a front end face located in the axial front thereof,
The annular member has a first cylindrical surface on its front end surface coaxially,
The annular plate has a second cylindrical surface coaxially at its center,
The press-fitting jig is adapted to press-fit the second cylindrical surface coaxially around the first cylindrical surface,
The press-fitting jig,
A centering pin inserted into the center hole of the fixed shaft;
A guide shaft fitted around the centering pin,
A press-fitting tool that is axially slidable around the guide shaft, and is configured to press a portion of the annular plate around the second cylindrical surface ,
The second cylindrical surface is formed by bending an inner peripheral edge of the annular plate forward.
The press-fitting jig, wherein the press-fitting tool is configured to press a peripheral portion located radially outward from a bent portion of the annular plate . The annular plate has an outer cylindrical portion formed by bending an outer peripheral edge of the outer plate forward, and a flange formed by bending a front end of the outer cylindrical portion radially outward,
The press-fitting jig according to claim 1 , wherein the press-fitting tool comes into surface contact with the flange when the press-fitting is performed . The press-fitting tool is connected to the guide shaft so as not to be detachable, and is connected to the guide shaft so as to be extendable and contractible,
The press-fitting jig according to claim 1, wherein the press-fitting jig includes an urging member that urges the press-fitting tool in an extending direction. The press-fitting jig according to any one of claims 1 to 3, wherein the annular member is a hub of a vehicle transmission, and the fixed shaft is a rotation shaft of the vehicle transmission. .

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