JP5019100B2 - Jig used for disassembling the cross joint and disassembling method of the cross joint - Google Patents

Description

  The present invention relates to a jig used for disassembling a cross joint applied to, for example, a propeller shaft, and a disassembling method thereof.

  Examples of this type of cross joint include those disclosed in JP-A-5-332347 (Patent Document 1) and JP-A-2004-169874 (Patent Document 2). That is, the cross joint includes a cross member having a shaft portion protruding in four directions, and a pair of bottomed cylindrical shapes that respectively accommodate at least the distal ends of the pair of shaft portions and rotatably support the shaft portions around the shaft. And a yoke having a pair of through holes into which the cup members are respectively inserted.

  Such disassembly of the cross joint will be described with reference to FIG. First, as shown in FIG. 7A, the retaining rings 7 and 8 attached to the pair of through holes of the yoke 1 are removed. Subsequently, as shown in FIG. 7B, the cross member 2 is pressed against the yoke 1 in the axial direction of the pair of shaft portions 21 and 22 (downward in FIG. 7B) using a press machine or the like. To do. Further, as shown in FIG. 7C, the cross member 2 is pressed against the yoke 1 in the opposite axial direction (upward in FIG. 7C) using a press machine or the like. As a result, the cup members 3 and 4 on both sides come into contact with and are pressed against the base portions 21 a and 22 a of the shaft portions 21 and 22, and move to the outside of the through hole of the yoke 1.

  Then, as shown in FIG. 7C, the cross member 2 is moved to the upper cup member 3 side. At this time, a slight gap is formed between the tip of the lower shaft portion 22 of the cross member 2 and the opening end surface of the lower cup member 4, and further, the tip of the lower shaft portion 22 of the cross member 2 and the lower cup. A space is formed between the cylinder bottom of the member 4. Then, as shown in FIG. 7 (d), a plurality of metal washers 100 are inserted into the cylinder bottom side inside the cylinder of the lower cup member 4 from the formed gap, and the lower shaft portion 22 of the cross member 2. The metal washer 100 fills the space between the tip of the lower cup member 4 and the cylinder bottom of the lower cup member 4.

Subsequently, as shown in FIG. 7 (e), by using a press machine or the like, the cross member 2 is pressed toward the lower cup member 4 side into which the metal washer 100 is inserted (downward in FIG. 7 (e)). The lower cup member 4 is removed from the through hole of the yoke 1. Then, as shown in FIG. 7 (f), the cross member 2 is removed from the yoke 1 using the through hole of the yoke 1 in which the removed lower cup member 4 is fitted. Finally, as shown in FIG. 7 (g), the upper cup member 3 is removed from the through hole of the yoke 1 using a cylindrical jig 200.
JP-A-5-332347 JP 2004-169874 A

  However, since the gap between the tip of the lower shaft portion 22 of the cross member 2 and the open end surface of the lower cup member 4 is very slight, the metal washers 100 must be inserted one by one. Therefore, workability is very poor, and a lot of work time is required. Further, when the metal washer 100 is inserted into the cylinder of the lower cup member 4, there is a risk that the metal washer 100 may be inclined inside the cylinder due to the influence of internal grease or the like. In such a case, an operation of inserting tweezers or a screwdriver or the like into the cylinder from the gap and laying down the metal washer 100 inserted into the cylinder occurs, and the disassembling work is greatly increased.

  Further, when the cross joint is operated, in order to avoid the direct contact between the tip ends of the shaft portions 21 and 22 of the cross member 2 and the bottom portions of the cup members 3 and 4, There is a cross joint with resin washers. By disassembling such a cross joint as described above, the resin washer is pressed by the metal washer 100, and the resin washer may be deformed. Then, when reassembling, it becomes necessary to replace the deformed resin washer. Thus, the cross joint disassembly method using the metal washer 100 has various problems.

  Therefore, the present invention has been made in view of such circumstances, and a jig that can disassemble the cross joint very easily without using the metal washer 100 when disassembling the cross joint, and its An object is to provide a decomposition method.

The cross joint, which is the object of disassembly of the jig of the present invention, shares a central axis with a cross member in which shaft portions are formed to protrude in four directions orthogonal to each other and each shaft portion is erected at the root portion having a diameter larger than the diameter. A pair of bottomed cylindrical cup members that respectively accommodate at least the distal end sides of the pair of shaft portions and support the shaft portions so as to be rotatable about the shaft, and a pair of through holes into which the cup members are respectively fitted. And a yoke. The jig of the present invention used for disassembling the cross joint is formed between the root portion formed by pressing the cross member against the yoke in the central axis direction of the pair of shaft portions and the opening end surface of the cup member. Can be inserted into the axial clearance of the cup member, and can be fitted into the through-hole. One end engages with the opening end surface of the cup member while the other end is the root portion. A jig main body portion that engages in the axial direction with respect to the axial direction, and the cross section of the jig main body has an arc shape in the direction perpendicular to the axis. The seal member is provided so as to protrude to the shaft portion, and is in contact with the shaft portion. The radius of the inner surface of the contact end of the jig body portion with respect to the opening end surface of the cup member is a protruding portion from the opening end surface of the seal member. It is larger than the outer diameter of Turkey The features.

  A method for disassembling the cross joint using the jig of the present invention will be described. First, when a retaining ring is attached to the through hole of the yoke, the retaining ring is removed. Then, the cross member is pressed against the yoke in the direction of the central axis of the pair of shaft portions sharing the central axis. Here, the cross member may be pressed only in the central axis direction of one shaft portion against the yoke, or may be pressed in the central axis direction of both shaft portions. Thereby, the axial direction clearance gap between the root part by which the axial part of a cross member stands is formed, and the opening end surface of one cup member is formed. Subsequently, the jig of the present invention is arranged on the outer circumferential side of the axial gap and the shaft portion of the cross member. Subsequently, the cross member is pressed against the yoke from the center of the cross member toward the jig placement side. Thereby, one cup member is removed from a yoke. Thereafter, as in the conventional case, the cross member is removed from the yoke, and the other cup member is removed from the yoke.

  Here, the axial clearance between the base portion where the shaft portion of the cross member is erected and the opening end surface of one cup member is the same as the tip of the shaft portion of the cross member into which the metal washer has been inserted in the past. Compared to a slight gap with the opening end face of the cup member, this is a very large gap. Therefore, the work of arranging the jig of the present invention in the axial gap can be made much easier than the conventional work of inserting the metal washer into the axial gap. Furthermore, the work corresponding to the work of putting the metal washer down is not necessary when the jig of the present invention is used. That is, workability is very good by using the jig of the present invention.

  Further, when forming an axial gap between the root portion where the shaft portion of the cross member is erected and the opening end surface of one cup member, the cross member is in the direction of the central axis of the one shaft portion with respect to the yoke. You may press only. This is because an axial gap is always formed even when the cross member is pressed only against the yoke in the direction of the central axis of one of the shaft portions. On the other hand, conventionally, if the cross member is not pressed in both axial directions against the yoke, a slight gap is not formed between the tip of the shaft portion of the cross member and the opening end surface of one cup member, and the metal washer is Could not insert. In other words, by using the jig of the present invention, forming the axial gap for placing the jig only requires pressing the cross member against the yoke in the central axis direction of at least one shaft portion. Therefore, the work can be simplified. However, when the cross member is pressed against the yoke in the central axis direction of both shaft portions, a larger axial clearance can be formed, and a jig having a jig body portion with a larger axial width. Can be used.

  Furthermore, as described above, the jig of the present invention is disposed in the axial gap between the root portion where the shaft portion of the cross member is erected and the opening end surface of the cup member. Therefore, it is not disposed at the bottom of the cup member. That is, when disassembling the cross joint where the resin washer is disposed, the jig of the present invention does not contact the resin washer. As a result, it is possible to prevent the resin washer from being deformed.

Further, the jig main body portion has an arc-shaped cross section perpendicular to the axis . When the cross section in the direction perpendicular to the axis has an arc shape, the cross section can be easily disposed on the outer periphery of the shaft portion of the cross member from the separated portions at both ends of the arc. This arc shape includes, for example, a C-shape. That is, the separated portions at both ends of the arc correspond to C-shaped slit portions.

  In this case, the separation distance between the arc ends of the jig main body, for example, the slit opening width in the case of the C-shaped shape, may be formed at an interval corresponding to the diameter of the shaft portion. That is, the slit opening width is formed at an interval determined based on the diameter of the shaft portion. For example, the slit opening width may be substantially equal to the diameter of the shaft portion, may be larger than the diameter of the shaft portion, or may be formed slightly smaller than the diameter of the shaft portion. Accordingly, the jig main body can be reliably inserted and arranged on the outer periphery of the shaft portion of the cross member. In particular, it is effective when the cross section perpendicular to the axis of the jig main body has an arc shape of 180 degrees or more.

  When the cross section perpendicular to the axis of the jig main body has an arc shape of 180 degrees or more, one jig main body is inserted and arranged in the circumferential direction of the outer peripheral surface of the shaft portion of the cross member. Of course, a plurality of jig body portions may be arranged in the circumferential direction of the outer peripheral surface of the shaft portion. In this case, it is possible to arrange the jig body part over the entire outer peripheral surface of the shaft part. Thereby, when pressing a cup member with a cross member via a jig, a pressing force is applied over the entire circumference. Therefore, the cup member can be removed stably.

Also, the cross joint, the and the shaft portion is provided so as to protrude from the opening end surface provided on the inner peripheral side of the cup member to the cylindrical outside provided with abutting sealing member, the opening of the cup member of the jig main body portion The radius of the inner side surface of the abutting end to the end surface is formed to be larger than the outer diameter of the protruding portion from the opening end surface of the seal member . Thereby, the jig body is in contact with and engaged only with the open end surface of the cup member. Therefore, since the jig main body portion does not contact the seal member, it is possible to prevent adverse effects on the seal member.

  Further, when the cross joint includes a dust shield provided on the outer peripheral side of the root portion where the shaft portion of the cross member is erected and covers the opening of the cup member, the shaft portion of the cross member of the jig body portion The radius of the outer surface of the abutting end with respect to the root portion where the erection is erected is preferably smaller than the inner diameter of the dust shield. As a result, the jig main body abuts and engages only with the shaft portion positioned closer to the shaft center side of the shaft portion than the dust shield. Therefore, since the jig body does not contact the dust shield, it can be prevented that the dust shield is adversely affected.

  By the way, in the case where the cross section perpendicular to the axis of the jig main body has an arc shape, when the jig main body is compressed in the axial direction, the diameter of the jig main body expands depending on the material of the jig main body and the shape of the end. There is a risk. If the diameter of the jig main body is increased, the jig main body contacts the through hole of the yoke and a large pressing force is applied to the through hole. As a result, the through hole may be deformed. Therefore, the jig of the present invention may be further provided with a lock member that is provided in the jig body part and suppresses the diameter expansion of the jig body part. Thereby, even if it is a case where a jig | tool main-body part is compressed to an axial direction, it can suppress that a jig | tool main-body part expands in diameter. Therefore, even if the jig body portion contacts the through hole, it is possible to prevent a large pressing force from being applied to the through hole.

  And when providing a locking member, it can do as follows. That is, it is preferable that the jig main body portion is formed with a groove on the outer peripheral side in the circumferential direction, and the lock member is formed in a ring shape or a C shape, and is entirely accommodated in the groove. Thereby, it can prevent reliably that a jig main-body part expands in diameter. Furthermore, since all the lock members are accommodated in the groove, they do not protrude to the outer peripheral side of the jig main body. Therefore, when the jig main body is positioned between the outer peripheral surface of the shaft portion of the cross member and the inner peripheral surface of the through hole of the yoke, the lock member does not contact the through hole. That is, the deformation of the through hole due to the presence of the lock member can be reliably prevented.

  Moreover, in the above, the case where this invention was grasped | ascertained as a jig | tool was demonstrated. In addition, the present invention can also be grasped as a cross joint disassembly method. That is, the disassembling method of the cross joint according to the present invention includes a pair of shaft members that are formed so as to protrude in four directions orthogonal to each other and each shaft portion is erected at a root portion having a diameter larger than the diameter, and a pair sharing a central axis. A yoke having a pair of bottomed cylindrical cup members that respectively accommodate at least the tip side of each of the shaft portions and rotatably support the shaft portions around the shaft, and a pair of through holes into which the cup members are respectively fitted. A cross joint disassembling method comprising: pressing a cross member against a yoke in a direction of a central axis of a pair of shaft portions to form an axial gap between a root portion and an opening end surface of the cup member After the axial gap forming step and the axial gap forming step, a jig that engages with the opening end surface and the root portion of the cup member and can be fitted into the through hole is provided on the outer peripheral side of the axial portion of the axial gap. Oji to be placed in And a cup removing step of removing the cup member from the yoke by pressing the cross member against the yoke from the center of the cross member toward the jig arranging side after the jig arranging step. To do.

  The cross joint disassembly method of the present invention is a disassembly method using the jig of the present invention described above. Thereby, the same effect as the case where the jig mentioned above is used can be exhibited.

  Also, the axial gap forming step in the disassembling method of the cross joint is performed by pressing the cross member against one of the central axial directions of the pair of shaft portions against the yoke and then pressing in the opposite direction. This is a step of forming an axial gap between the opening end face.

  Thus, a larger axial clearance can be formed by pressing the cross member against the yoke in the direction of the central axis of both shaft portions. As a result, a jig having a larger axial width can be used.

  By disassembling the cross joint using the jig of the present invention, it is possible to disassemble the cross joint very easily compared to the case of using the metal washer 100 as in the prior art. In particular, when the jig of the present invention is used, it can be very easily attached to a predetermined position of the cross joint. Furthermore, when disassembling the cross joint in which the resin washer is disposed, it can be disassembled without pressing the resin washer. Therefore, deformation of the resin washer can be prevented.

  Next, the present invention will be described in more detail with reference to embodiments. First, the structure of the assembled cross joint will be described, then the jig used for disassembling the cross joint will be described, and then the cross joint disassembling method will be described.

(1) Configuration of Cross Joint First, the configuration of the assembled cross joint will be described with reference to FIGS. 1 (a) and 1 (b) and FIG. 7 (a). FIG. 1A shows an axial cross-sectional view of the assembled cross joint, and FIG. 1B shows an axial sectional view of the assembled cross joint. FIG. 7A shows a perspective view of the cross joint as described above. Here, the cross joint is incorporated into, for example, a propeller shaft (not shown) of a 4WD vehicle or an FR vehicle, and used for connecting drive system components. In the present embodiment, a cross joint used for a connection portion between the propeller shaft and the differential gear will be described.

  As shown in FIGS. 1A and 1B, the cross joint includes a yoke 1, a cross member 2, an upper cup member 3, a lower cup member 4, an upper seal member 5, and a lower seal member. 6, an upper retaining ring 7, and a lower retaining ring 8.

  The yoke 1 includes a seat portion 11 and a pair of arm portions 12 and 13. The seat portion 11 has a substantially rectangular plate shape, and has bolt insertion holes 11a formed at four corner portions. The seat portion 11 is fixed to a rotary shaft (not shown) of the differential gear by inserting a bolt (not shown) into the bolt insertion hole 11a. The pair of arm portions 12 and 13 project on one surface of the seat portion 11 (the surface opposite to the mounting surface with the differential gear) and face each other in the vertical direction in FIGS. It is provided as follows. And the upper arm part 12 and the lower arm part 13 are formed with through holes 12a and 13a having the same diameter and the same axis at the center. A pair of shaft portions 21 and 22 of the cross member 2 to be described later are fitted into the through holes 12a and 13a, respectively. Furthermore, ring grooves 12b and 13b are formed on the inner peripheral surfaces of the through holes 12a and 13a over the entire circumference. Retaining rings 7, 8 to be described later are fitted into the ring grooves 12b, 13b.

  The cross member 2 has a cross shape in which shaft portions 21, 22, 23, and 24 are formed to protrude in four directions orthogonal to each other. Each of the shaft portions 21 to 24 has a cylindrical shape with the same diameter, and is erected on the root portions 21 a to 24 a having a larger diameter than the shaft portions 21 to 24. The upper shaft portion 21 and the lower shaft portion 22 are provided coaxially so as to share the central axis. The outer diameters of the upper shaft portion 21 and the lower shaft portion 22 are formed to be smaller than the inner diameters of the through holes 12 a and 13 a formed in the arm portions 12 and 13 of the yoke 1. The distal end side of the upper shaft portion 21 is inserted into the through hole 12 a of the upper arm portion 12, and the distal end side of the lower shaft portion 22 is inserted into the through hole 13 a of the lower arm portion 13. The right shaft portion 23 and the left shaft portion 24 are provided on axes that are orthogonal to the axes of the upper shaft portion 21 and the lower shaft portion 22. The right shaft portion 23 and the left shaft portion 24 are inserted into through holes of a pair of arm portions (not shown) in a U-shape formed at the end portion of the propeller shaft.

  Further, the base portions 21a to 24a where the shaft portions 21 to 24 of the cross member 2 are erected have a shape in which the shaft diameter increases from the tip side toward the root side. Furthermore, the cross member 2 has dust shields 26, 27, 28, which are formed so as to protrude outwardly from the respective shaft diameters and toward the distal ends of the shaft portions 21 to 24 on the entire circumferences of the respective base portions 21 a to 24 a. 29. These dust shields 26 and 27 are members that cover the openings of the upper cup member 3 and the lower cup member 4. The dust shields 28 and 29 cover the opening of a cup member (not shown), like the dust shields 26 and 27.

  The upper cup member 3 and the lower cup member 4 each have a bottomed cylindrical shape. The upper cup member 3 and the lower cup member 4 have bearings (not shown) fitted on the inner peripheral surface. The outer diameters of the cylindrical portions of the upper cup member 3 and the lower cup member 4 are formed substantially equal to the inner diameters of the through holes 12a and 13a of the pair of arm portions 12 and 13. Further, the inner diameters of the upper cup member 3 and the lower cup member 4, that is, the inscribed circles of the bearings, are formed substantially equal to the outer diameters of the upper shaft portion 21 and the lower shaft portion 22 of the cross member 2. The upper cup member 3 is inserted into the through hole 12a of the upper arm portion 12 by press fitting, and the lower cup member 4 is inserted into the through hole 13a of the lower arm portion 13 by press fitting. Further, the upper cup member 3 accommodates the distal end side (upper end side) of the upper shaft portion 21 of the cross member 2 and supports the upper shaft portion 21 so as to be rotatable about its axis. Further, the lower cup member 4 accommodates the distal end side (lower end side) of the lower shaft portion 21 of the cross member 2 and supports the lower shaft portion 22 so as to be rotatable about the axis.

  The upper seal member 5 and the lower seal member 6 are provided on the inner peripheral side of the upper cup member 3 and the lower cup member 4, respectively, and provided at the opening ends of the upper cup member 3 and the lower cup member 4. It has been. The upper seal member 5 and the lower seal member 6 protrude from the opening end surfaces of the upper cup member 3 and the lower seal member 6 to the outside of the cylinder, and the upper cup member 3 and the lower cup member 4 respectively. It is provided so as to protrude from the inner peripheral surface of the main shaft in the direction of the central axis. That is, the tip of the upper seal member 5 is in contact with the root portion 21 a of the upper shaft portion 21 of the cross member 2, and the dust shield 26 is disposed on the outer peripheral side of the upper seal member 5. The tip of the lower seal member 6 is in contact with the root portion 22 a of the lower shaft portion 22 of the cross member 2, and a dust shield 27 is disposed on the outer peripheral side of the lower seal member 6.

  The upper retaining ring 7 is fitted in the ring groove 12b of the through hole 12a of the upper arm portion 12, and prevents the upper shaft portion 21 from coming out above the through hole 12a. Further, the lower retaining ring 8 is fitted into the ring groove 13b of the through hole 13a of the lower arm portion 13 to prevent the lower shaft portion 22 from coming out below the through hole 13a.

(2) Jig Used for Disassembling Cross Joint Next, a jig used for disassembling the above-described cross joint will be described with reference to FIGS. 2 and 3A and 3B. FIG. 2 is a perspective view showing the jig body 9 of the jig. Fig.3 (a) shows the axial sectional view of the jig | tool main-body part 9, FIG.3 (b) shows the bottom view of Fig.3 (a). As shown in FIGS. 2 and 3 (a) and 3 (b), the jig is composed only of a jig main body 9 made of an arcuate C-shaped member in which a part of a cylindrical member is notched in the axial direction. That is, the jig main body 9 is formed in a C-shape having an arc-shaped cross section perpendicular to the axis.

  The minimum radius of curvature (innermost inner diameter) of the inner peripheral surface of the jig main body 9 is substantially the same as or slightly larger than the outer diameter of the shaft portions 21 and 22 of the cross member 2. The maximum curvature radius (outermost diameter) of the outer surface of the jig main body 9 is substantially the same as the inner diameter of the through holes 12a and 13a of the pair of arm portions 12 and 13 of the yoke 1, or slightly smaller than the inner diameter. It is formed small. That is, the jig body 9 can be fitted into the through holes 12a and 13a. One end 91 (the upper end of FIG. 3A) in the axial direction of the jig main body 9 is formed so that the thickness is thinner toward the end side. Specifically, the inner peripheral surface of one end 91 in the axial direction of the jig main body 9 increases in diameter toward the end side, and has a shape that follows the root portions 21 a and 22 a of the shaft portions 21 and 22. That is, in a state where the jig main body 9 is disposed on the outer peripheral side of the shaft portions 21 and 22, the entire surface or most of the axial end 91 of the jig main body 9 is the root portions 21 a and 22 a of the shaft portions 21 and 22. Abut.

  Further, the outer peripheral surface of the one end 91 in the axial direction of the jig main body portion 9 is reduced in diameter toward the end side. Specifically, the outer diameter of one end 91 in the axial direction of the jig main body 9 (the contact end with the root portion in the present invention) is formed smaller than the inner diameter of the dust shields 26 and 27. That is, the outer peripheral surface of the one end 91 in the axial direction of the jig main body 9 is not in contact with the dust shields 26 and 27 in a state where the jig main body 9 is disposed on the outer peripheral side of the shafts 21 and 22. .

  The other end 92 in the axial direction of the jig main body 9 (the lower end of FIG. 3A) (corresponding to the contact end to the opening end face in the present invention) has an inner diameter of the opening end face of the cup members 3 and 4. The outer diameter is smaller than the outer diameter, and the outer diameter is larger than the inner diameter of the opening end surfaces of the cup members 3 and 4. That is, when the jig body 9 is arranged coaxially with the cup members 3 and 4, the other axial end 92 abuts against the open end surface of the cup members 3 and 4. Further, the inner diameter of the other end 92 in the axial direction of the jig body 9 is formed larger than the outer diameter of the portion of the seal members 5, 6 that protrudes from the open end face of the cup members 3, 4. That is, when the jig main body 9 is disposed coaxially with the cup members 3 and 4 to which the seal members 5 and 6 are attached, the other axial end 92 does not contact the seal members 5 and 6.

  Further, the axial width of the jig main body 9 is formed to be equal to or slightly shorter than the axial length of the shaft portions 21 and 22. Specifically, the axial width of the jig main body 9 is set to be equal to or smaller than a lower axial clearance described later. Furthermore, the C-shaped opening width 9a (corresponding to the separation distance between the arc ends in the present invention) of the jig main body 9 is an interval corresponding to the diameter of the shaft portions 21 and 22, and more specifically, the shaft portion 21. , 22 is formed to be equal to or slightly larger than the diameter of 22. However, when the jig body portion 9 is formed of a hard elastic member, the C-shaped opening width 9a may be slightly smaller than the diameter of the shaft portions 21 and 22, and thus the jig body is formed. It becomes difficult for the part 9 to drop off from the shaft parts 21 and 22.

  Furthermore, it is optimal that the opening of the jig body 9 is formed by opposing parallel surfaces whose intervals are equal to the C-shaped opening width 9a. By comprising in this way, the contact | abutting area in both ends can be ensured to the maximum.

(3) Cross joint disassembling method Next, a cross joint disassembling method will be described with reference to FIGS. 1 (a) and 1 (b), FIGS. 4 (a) and 4 (b), and FIGS. 5 (a) and 5 (b). . 4A and 4B are views showing a state after the jig arranging step, where FIG. 4A shows a cross-sectional view perpendicular to the axis of the cross joint, and FIG. 4B shows an axial cross-sectional view of the cross joint. Indicates. 5A and 5B are views showing a state of the cup removing process. FIG. 5A shows a cross-sectional view perpendicular to the axis of the cross joint, and FIG. 5B shows an axial cross-sectional view of the cross joint. Show.

  First, from the assembled state of the cross joint shown in FIGS. 1A and 1B, the upper retaining ring 7 and the lower retaining ring 8 are removed from the through holes 12a and 13a, respectively (retaining ring removing step). Subsequently, with the yoke 1 fixed, the cross member 2 is pressed downward (one axial direction of the shaft portions 21 and 22) in FIG. 1 using a press or the like (first axial gap forming step). Then, the cross member 2 moves downward with respect to the yoke 1 to a position where the base portion 22a of the lower shaft portion 22 of the cross member 2 is in contact with or close to the lower arm portion 13. To do. As the cross member 2 moves downward, the lower cup member 4 and the lower seal member 6 move downward. At this time, the upper cup member 3 and the upper seal member 5 do not move with respect to the yoke 1. Therefore, in the state where the cross member 2 is pressed downward in FIG. 1, an upper axial gap is formed between the root portion 21 a of the upper shaft portion 21 of the cross member 2 and the opening end surface of the upper cup member 3.

  Subsequently, with the yoke 1 fixed, the cross member 2 is pressed upward in FIG. 1 (the other axial direction of the shaft portions 21 and 22) using a press or the like (second axial gap forming step). Then, the cross member 2 moves upward with respect to the yoke 1 to a position where the base portion 21a of the upper shaft portion 21 of the cross member 2 is in contact with or close to the upper arm portion 12. As the cross member 2 moves upward, the upper cup member 3 and the upper seal member 5 move upward. At this time, the lower cup member 4 and the lower seal member 6 do not move with respect to the yoke 1 and are positioned at the position after the first axial gap forming step. Therefore, in a state where the cross member 2 is pressed upward in FIG. 1, a lower axial clearance is formed between the root portion 22 a of the lower shaft portion 22 of the cross member 2 and the opening end surface of the lower cup member 4. Is done. This lower axial clearance is an axial clearance that is approximately twice the upper axial clearance formed in the first axial clearance forming step. At this time, the yoke 1, the cross member 2, the cup members 3, 4, and the seal members 5, 6 are in the state shown in FIGS.

  Subsequently, as shown in FIGS. 4A and 4B, the jig body 9 is inserted into the lower axial gap. Specifically, one end 91 in the axial direction of the jig main body 9 is positioned on the base portion 22a side of the lower shaft 22 of the cross member 2, and the other end 92 in the axial direction of the jig main body 9 is the lower cup member. The jig body 9 is arranged on the outer peripheral side of the lower shaft part 22 so as to be positioned on the side 4 (jig arrangement process). At this time, the axial width of the jig main body 9 is formed below the lower axial clearance, and the C-shaped opening width 9a of the jig main body 9 is formed at an interval corresponding to the diameter of the shaft 22. Therefore, the jig body 9 can be easily disposed on the outer peripheral side of the lower shaft portion 22.

  And in the state after the jig | tool arrangement | positioning process in which the jig | tool main body part 9 is arrange | positioned on the outer peripheral side of the lower side shaft part 22, the jig | tool main body part 9 is the root part 22a of the lower side shaft part 22, and a lower side cup member. 4 is engaged in the axial direction (vertical direction in FIGS. 4 (a) and 4 (b)) with respect to the opening end face of 4. Specifically, the inner peripheral surface of one end 91 in the axial direction of the jig main body portion 9 engages with the root portion 22 a of the lower shaft portion 22. At this time, one end 91 in the axial direction of the jig body 9 does not contact the dust shield 27. Therefore, it is possible to prevent the dust shield 27 from being adversely affected by using the jig body 9 when disassembling the cross joint. Further, the end surface of the other end 92 in the axial direction of the jig main body 9 engages only with the open end surface of the lower cup member 4. At this time, the other axial end 92 of the jig main body 9 does not contact the lower seal member 6. Therefore, it is possible to prevent the lower seal member 6 from being adversely affected by using the jig body 9 when disassembling the cross joint.

  Subsequently, with the yoke 1 fixed, the cross member 2 is pressed downward in FIGS. 4A and 4B by using a press or the like (lower cup removing step) (cup removal in the present invention). Process). That is, the cross member 2 is pressed against the yoke 1 from the center of the cross member 1 toward the arrangement side of the jig body 9. Then, as shown in FIGS. 5 (a) and 5 (b), until the base portion 22a of the lower shaft portion 22 of the cross member 2 is in contact with the lower arm portion 12 or is in the vicinity of contact, The member 2 moves downward with respect to the yoke 1. As the cross member 2 moves downward, the lower cup member 4, the lower seal member 6, and the jig body 9 move downward. That is, when the jig body 9 is interposed between the base portion 22a of the lower shaft portion 22 of the cross member 2 and the lower cup member 4, the lower cup member 4 has a first axial gap forming step. Compared to the later position, it moves further downward. Therefore, the lower cup member 4 can be removed from the through hole 13 a of the lower arm portion 13. Moreover, simultaneously with removing the lower cup member 4 from the through hole 13a, the jig body 9 is also removed from the through hole 13a.

  Here, during the cup removing process, the outermost diameter of the jig main body portion 9 is formed smaller than the inner diameter of the through hole 13 a of the lower arm portion 13. Therefore, the jig body 9 can be inserted inside the through hole 13a. However, since the jig body 9 has a C-shaped cross-sectional shape, the outer diameter of the jig body 9 is increased by compressing the jig body 9 to the cross member 2 and the lower cup member 4. Can be calibrated. However, even if the outer diameter of the jig body 9 is increased, it is guided by the through hole 13a. As described above, the jig body 9 can be prevented from being greatly deformed by the guide function of the through hole 13a.

  Then, as shown in FIG.7 (f), the cross member 2 is removed from the yoke 1 using the through-hole 13a in which the removed lower cup member 4 was inserted (cross removal process). Finally, as shown in FIG.7 (g), the upper side cup member 3 is removed from the through-hole 12a of the upper arm part 12 using the cylindrical jig | tool 200 (upper cup removal process).

  In this way, by disassembling the cross joint using the jig body 9, it is possible to disassemble the cross joint very easily without using the metal washer 100 as in the prior art.

(4) Other Embodiments of Jig In addition to the portion corresponding to the jig main body 9 described above, the jig includes a lock member that prevents the diameter of the jig main body 9 from expanding. Good. An example of the jig in this case will be described with reference to FIG. FIG. 6 is a perspective view showing another jig.

  As shown in FIG. 6, the jig main body 90 is different from the jig main body 9 described above in that a circumferential groove 93 is formed on the outer peripheral side. The circumferential groove 93 is formed at substantially the center in the axial direction over the entire circumference in the circumferential direction of the outer peripheral surface. The lock member 80 is made of a C-shaped snap ring or a ring-shaped elastic member. The inner diameter of the lock member 80 is formed substantially equal to the groove bottom diameter of the circumferential groove 93, and the outer diameter of the lock member 80 is smaller than the outermost diameter of the jig body 9. That is, the lock member 80 is entirely accommodated in the circumferential groove 93.

  A method of disassembling the cross joint using such a jig will be described. First, similarly to the above embodiment, a retaining ring removing step, a first axial gap forming step, and a second axial gap forming step are performed. Subsequently, the jig main body 90 is inserted into the lower axial gap (jig main body arranging step). Subsequently, the lock member 80 is arranged in the circumferential groove 93 of the jig main body 90 (lock member arrangement step). Subsequently, a lower cup removing process, a cloth removing process, and an upper cup removing process are performed. As described above, by using the jig including the jig body 90 and the lock member 80, the diameter of the jig body 90 can be suppressed from being increased.

  Moreover, in the said embodiment, the jig main-body parts 9 and 90 were made into the C-shaped cross-sectional shape, and only one jig main-body parts 9 and 90 were used. However, the present invention is not limited to this, and a plurality of jig body portions may be used. For example, a plurality may be arranged in the circumferential direction of the outer peripheral surface of the shaft portion 22. Further, a plurality of jig main body portions may be arranged in the axial direction of the shaft portion 22. Moreover, in the said embodiment, the 1st axial direction gap formation process and the 2nd axial direction gap formation process were performed as an axial direction clearance gap formation process. Even if only one of the first axial gap forming step and the second axial gap forming step is performed, the cross joint can be disassembled. When performing both processes, the lower axial gap can be formed large, so that the jig body 9 having a large axial width can be used. As a result, the cross joint can be disassembled with less man-hours.

It is a figure which shows the cross joint of the assembled state. It is a perspective view which shows the jig | tool main body part 9. FIG. FIG. 6 is a cross-sectional view of a jig body 9. It is a figure which shows the cross joint of the state after a jig | tool arrangement | positioning process. It is a figure which shows the cross joint of the state of a cup removal process. It is a perspective view which shows the jig | tool of other embodiment. It is a figure explaining the decomposition | disassembly method of the conventional cross joint.

Explanation of symbols

1: yoke, 2: cross member, 3: upper cup member, 4: lower cup member,
5: Upper seal member, 6: Lower seal member, 7: Upper retaining ring, 8: Lower retaining ring,
9, 90: Jig body, 9a: C-shaped opening width,
11: seat part, 11a: bolt insertion hole, 12: upper arm part,
13: Lower arm part, 12a, 13a: Through hole, 12b, 13b: Ring groove,
21: Upper shaft portion, 22: Lower shaft portion, 23: Right shaft portion, 24: Left shaft portion,
21a, 22a, 23a, 24a: root part,
26, 27, 28, 29: Dust shield,
80: Lock member, 91: One axial end, 92: Other axial end, 93: Circumferential groove,
100: Metal washer, 200: Columnar jig

Claims (8)

A shaft member is formed so as to protrude in four directions perpendicular to each other, and each shaft portion accommodates at least the distal end side of the pair of shaft portions sharing a central axis, and a cross member erected at a root portion having a diameter larger than the diameter thereof. In addition, it is used for disassembling a cross joint including a pair of bottomed cylindrical cup members that rotatably support the shaft portions around an axis, and a yoke having a pair of through holes into which the cup members are respectively fitted. A jig,
The cross member can be inserted into an axial gap between the base portion formed by pressing the cross member against the yoke in the central axis direction of the pair of shaft portions and the opening end surface of the cup member, and A fitting that can be fitted into the through-hole and that engages with the opening end surface of the cup member while the other end engages with the root portion while being inserted into the axial gap. With a tool body ,
The jig body portion has an arc-shaped cross section perpendicular to the axis,
The cross joint includes a seal member that is provided on an inner peripheral side of the cup member, is provided so as to protrude from the opening end surface to the outside of the cylinder, and is in contact with the shaft portion.
Radius of the inner surface of the abutment end of the open end of the cup member of the jig main body is characterized Rukoto formed larger than the outer diameter of the protruding portion from the opening end face of said seal member Jig used for disassembling cross joints. The jig used for disassembling the cross joint according to claim 1 , wherein a separation distance between both ends of the arc of the jig main body is formed at an interval corresponding to a diameter of the shaft. 3. The jig used for disassembling the cross joint according to claim 1 , wherein a plurality of the jig main body portions are arranged in a circumferential direction of the outer peripheral surface of the shaft portion and are arranged over the entire outer peripheral surface of the shaft portion . The cross joint includes a dust shield that is provided on the outer peripheral side of the root portion and covers the opening of the cup member,
The disassembly of the cross joint according to any one of claims 1 to 3 , wherein a radius of an outer surface of an abutting end to the root portion of the jig main body is smaller than an inner diameter of the dust shield. The jig to use. The jig used for disassembling the cross joint according to any one of claims 1 to 4 , wherein the jig further includes a lock member that is provided in the jig main body portion and suppresses the diameter expansion of the jig main body portion. . The jig body is formed with a groove on the outer peripheral side in the circumferential direction,
The jig used for disassembling the cross joint according to claim 5 , wherein the lock member is formed in a ring shape or a C shape, and is entirely accommodated in the groove. A shaft member is formed so as to protrude in four directions perpendicular to each other, and each shaft portion accommodates at least the distal end side of the pair of shaft portions sharing a central axis, and a cross member erected at a root portion having a diameter larger than the diameter thereof. In addition, a cross joint disassembling method comprising a pair of bottomed cylindrical cup members that rotatably support the shaft portions around an axis, and a yoke having a pair of through holes into which the cup members are respectively fitted. There,
An axial gap forming step for forming an axial gap between the root portion and the opening end surface of the cup member by pressing the cross member against the yoke in the central axis direction of the pair of shaft portions;
After the axial gap forming step, a jig that engages with the opening end surface of the cup member and the root portion and can be fitted into the through hole is disposed on the outer peripheral side of the axial portion of the axial gap. Jig arrangement process to arrange;
After the jig placement step, a cup removal step of removing the cup member from the yoke by pressing the cross member against the yoke from the center of the cross member toward the jig placement side;
Equipped with a,
The jig body portion has an arc-shaped cross section perpendicular to the axis,
The cross joint includes a seal member that is provided on an inner peripheral side of the cup member, is provided so as to protrude from the opening end surface to the outside of the cylinder, and is in contact with the shaft portion.
Radius of the inner surface of the abutment end of the open end of the cup member of the jig main body is characterized Rukoto formed larger than the outer diameter of the protruding portion from the opening end face of said seal member Cross joint disassembly method. In the axial clearance forming step, the cross member is pressed against one of the central axial directions of the pair of shaft portions against the yoke, and then pressed in the opposite direction, thereby opening the end surfaces of the root portion and the cup member. The method for disassembling a cross joint according to claim 7 , wherein the axial gap is formed between the first and second axes.

Images