JP2004076761A - Shaft insertion tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft insertion tool easy to align to a seal retainer and automatically detachable. <P>SOLUTION: A shaft guide hub 12 is divided into half hubs 12a, 12b, and the half hubs 12a, 12b are supported openable/closable around a supporting pin 14 and energized to an unfolding direction by a compression spring 15. In mounting the tool, the half hubs 12a, 12b are gripped, positioning protruded portions 12e protruded on the back faces thereof are mounted at the edge of an inner periphery face 1a of the seal retainer 1, and the positioning protruded portions 12e are pushed against the inner periphery edge of the seal retainer 1 by the energizing force of the compression spring 15 until the axial center of the inner periphery face 1a of the seal retainer 1 is agreed with the axial centers of shaft guide faces 12c of the half hubs 12a, 12b. Then, an axle shaft 21 being supported on the shaft guide faces 12c is inserted from the outside. In this process, when a gripping portion 22 gripping the axle shaft 21 pushes a receiving face 17a of a lever 17, the shaft guide hub 12 is inclined to make the positioning protruded portion 12e moved away from the inner periphery edge of the seal retainer 1 and the half hubs 12a, 12b automatically unfolded by the energizing force of the compression spring 15. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shaft insertion jig for inserting a shaft in a state where the shaft is centered in a seal retainer to which an oil seal is attached.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a process of assembling a transmission, when an axle shaft is attached to a differential housing provided in the transmission, the axle shaft is often mounted from the outside in a later process.
[0003]
Since a seal retainer that holds an oil seal such as a mechanical seal is attached in advance to the shaft insertion port of the differential housing, the spline engagement part formed at the tip of the axle shaft is used to insert the oil seal into the lip of the oil seal. When the contact is made, the lip portion is deformed or damaged, and the oil tightness is reduced.
[0004]
Therefore, when assembling the axle shaft to the differential housing, it is necessary to take measures to prevent deformation and damage of the oil seal.
[0005]
For example, in Japanese Patent Application Laid-Open No. Hei 7-280098, a flexible cylindrical cover such as pineal is attached to the inner peripheral surface of the lip portion of the oil seal, and the end is projected outside. A technique is disclosed in which when an axle shaft is inserted, the oil seal and the axle shaft are prevented from contacting each other by a cylindrical cover, and after the axle shaft is mounted, the cylindrical cover is removed by pulling out the cylindrical cover.
[0006]
Japanese Patent No. 3099565 (JP-A-6-201023) discloses that a tubular protective body is attached to a spline engaging portion formed at the tip of an axle shaft, and the axle shaft is inserted into an accelerator housing in that state. This prevents the oil seal from being damaged, and after the axle shaft is assembled in a predetermined manner, the tubular protective body is left at the shaft insertion opening of the accelerator housing, so that the tubular protective body functions as a bush. The technology is disclosed.
[0007]
[Problems to be solved by the invention]
However, the technique disclosed in Japanese Patent Application Laid-Open No. 7-280098 is uneconomical because the tubular cover cannot be used repeatedly, and when the tubular cover is pulled out and removed, the tubular cover is removed. There is a problem that the lip of the oil seal is easily deformed by sliding.
[0008]
Further, in the technique disclosed in Japanese Patent No. 3099565 (Japanese Patent Application Laid-Open No. 6-201023), when the axle shaft is mounted, contact between the lip portion of the oil seal and the cylindrical protective body is avoided, and deformation due to contact is prevented. To prevent this, it is necessary to set the inner diameter of the oil seal at least larger than the outer diameter of the cylindrical protective body, but in order to ensure the inner diameter of the oil seal, the shape of the axle shaft must also be changed. Therefore, the existing axle shaft cannot be used, and there is a problem of lack of versatility.
[0009]
Further, in the technology disclosed in this publication, the tubular protective body is made to function as a bush. However, the tubular protective body is inserted later into a portion that does not originally need to function as a bush, and is used as a bush. Due to the function, the structure inside the shaft housing is unnecessarily complicated, and there is a problem that manufacturing and assembling are complicated and the product cost is increased.
[0010]
Regardless of the technique disclosed in any of the publications, the axle shaft must be attached to the shaft insertion opening formed in the shaft housing after the shaft center has been adjusted to some extent. Careful centering work is required when assembling the shaft, and there is a problem of poor workability.
[0011]
In view of the above circumstances, the present invention is not only economical and can be used repeatedly, but also has good workability because careful centering work is not required, and also modifies the structure of the shaft and the shaft housing. An object of the present invention is to provide a shaft insertion jig which is excellent in versatility and can be easily handled because it can be used without performing.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a shaft having an oil seal attached to an inner peripheral surface of a seal retainer attached to a shaft insertion port of a shaft housing, and having a spline engaging portion at a tip with respect to the inner peripheral surface. In a shaft insertion jig for guiding in a state where the centers are aligned, a cylindrical guide member having a shaft guide surface on an inner periphery is provided, and a seal retainer is provided on a surface of the cylindrical guide member which comes into contact with an insertion opening of the seal retainer. And a positioning projection that engages with an inner peripheral end of the cylindrical guide member so as to match an axis of the inner periphery of the shaft insertion port with the shaft guide surface of the cylindrical guide member.
[0013]
In such a configuration, the positioning protrusion formed on the cylindrical guide member is engaged with the inner peripheral edge of the seal retainer provided at the shaft insertion port of the shaft housing, and the inner peripheral surface of the seal retainer is brought into contact with the cylindrical surface. After aligning the axis with the shaft guide surface formed on the inner periphery of the guide member, the tip of the axle shaft is inserted into the shaft guide surface, and the shaft guide surface is used as a guide, and the axis of the shaft guide surface is adjusted. Guide the axle shaft to the shaft insertion port where the heart matches. As a result, the axle shaft is guided in a state where the axes of the axle shafts are aligned with the shaft insertion port, so that the axle shaft can be inserted without contacting the oil seal held by the seal retainer.
[0014]
In this case, preferably, 1) the cylindrical guide member formed of a pair of half-shaped guide members divided into two in a semicircular shape, and a spring for urging the two half-shaped guide members in a direction away from each other. A member, an arm that supports the two half-shaped guide members so as to be openable and closable, and a lever portion that is connected to the arm and that can contact a grip portion that grips the shaft. I do.
[0015]
2) The shaft housing is provided in a transmission case, and the shaft is an axle shaft.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Here, FIG. 1 is a front view of the shaft insertion jig attached to the seal retainer, FIG. 2 is a front view of the shaft insertion jig when opened, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, and FIG. FIG. 5 is a partial sectional side view in a state where the shaft insertion shaft is detached from the seal retainer.
[0017]
Reference numeral 1 in FIGS. 3 to 5 is a seal retainer. The seal retainer 1 is attached to a shaft insertion opening (not shown) formed in a shaft housing such as a differential case integrally formed with a transmission case, and is provided near an outer opening side of the inner peripheral surface 1a. An oil seal 2 such as a mechanical seal is attached.
[0018]
On the other hand, reference numeral 11 denotes a shaft insertion jig, and a shaft guide hub 12 as a cylindrical guide member of the shaft insertion jig 11 is divided into half hubs 12a and 12b as half-shaped guide members. Each of the half hubs 12a and 12b is obtained by half-processing a shaft guide hub 12 formed in a perfect circle by milling or the like. When the two half hubs 12a and 12b are arranged in a perfect circle, the two half hubs 12a and 12b are formed. A gap is formed between the opposing surfaces of the upper portions 12a and 12b so as to allow for a recess at the time of mounting.
[0019]
Arms 13a and 13b extend from the lower portions of the half hubs 12a and 12b, and the lower portions of the arms 13a and 13b are bent in a direction approaching each other, and support the bolts or the like in a state where the lower ends are overlapped with each other. It is rotatably supported via a pin 14.
[0020]
Further, a compression spring 15 as a spring member is interposed between the opposing surfaces of the arms 13a and 13b. As shown in FIG. 2, the half hubs 12a and 12b in the non-restrained state are expanded by receiving the urging force of the compression spring 15. The opening angles of the two half hubs 12a and 12b are set by stoppers (not shown) formed at the lower ends of the arms 13a and 13b. In this embodiment, the opening angle is set to 40 °.
[0021]
A support bracket 16 extends downward from the support pin 14, and one end of a lever 17 is fixed to the lower front surface of the support bracket 16. The lever 17 is bent in a crank shape and protrudes forward, and has a receiving surface 17a curved at the front end. The front end and the base of the lever 17 are connected via a stay 18.
[0022]
Also, as shown in FIG. 1, the two half hubs 12a, 12b are closed against the urging force of the compression spring 15, and the upper surfaces of the two half hubs 12a, 12b are opposed to each other with a clearance space therebetween. Thus, a shaft guide hub 12 having a perfectly circular shaft guide surface 12c on the inner periphery is formed. The insertion openings of the half hubs 12a and 12b having the shaft guide surface 12c are chamfered to form a tapered guide surface 12d.
[0023]
On the back surface of each half hub 12a, 12b, a positioning ridge 12e is formed which is a perfect circle concentric with the shaft guide surface 12c when the half hubs 12a, 12b are in the closed state shown in FIG. ing. The outer periphery of the positioning ridge 12e is formed with the same curvature as the inner peripheral surface 1a of the seal retainer 1. Further, the end extending to the lower portion of the positioning ridge 12e is halfway through the half hub 12a. , 12b.
[0024]
Reference numeral 21 denotes an axle shaft having spline engagement portions 21a formed at both ends. The axle shaft 21 has a minimum diameter at the spline engagement portions 21a at both ends and gradually increases in diameter toward the middle, and at a portion facing the oil seal 2, the outer periphery of the axle shaft 21 It is formed to a thickness that slides on the lip.
[0025]
Note that FIGS. 4 and 5 show a state in which the middle part of the axle shaft 21 is gripped by the gripping part 22 of the shaft insertion device, so that the part where the lip part of the oil seal 2 slides is omitted. I have.
[0026]
Next, the operation of the present embodiment having such a configuration will be described. When the axle shaft 21 is mounted on a shaft housing such as a differential case formed in a transmission, first, the half hubs 12a and 12b of the shaft insertion jig 11 are sandwiched against the urging force of the compression spring 15, and After the positioning ridges 12e projecting from the rear surfaces of the half hubs 12a and 12b are attached to the edge of the inner peripheral surface 1a of the seal retainer 1 in a state where the gap corresponding to the recess is reduced. The pinching force on the half hubs 12a and 12b is released.
[0027]
Then, the two half hubs 12a, 12b are expanded by receiving the urging force of the compression spring 15, and the outer peripheral surfaces of the positioning ridges 12e projecting from the rear surfaces of the half hubs 12a, 12b are brought into contact with the seal retainer 1. It contacts the edge of the peripheral surface 1a. The outer periphery of the positioning ridge 12e has the same curvature as the inner peripheral surface 1a of the seal retainer 1, and the positioning ridge 12e and the shaft guide surface 12c are formed concentrically. The shaft guide surface 12c formed on each of the half hubs 12a and 12b has a perfect circle, and its axis coincides with the axis of the inner peripheral surface 1a of the seal retainer 1.
[0028]
In this state, the spline engagement portion 21a formed at the tip of the axle shaft 21 gripped from outside by the grip portion 22 of the shaft insertion device is opened in the shaft guide hub 12 of the shaft insertion jig 11. The shaft guide surface 12c to be inserted. At this time, since the taper guide surface 12d is formed at the insertion opening of the shaft guide surface 12c, the tip of the spline engaging portion 21a formed on the axle shaft 21 is moved along the taper guide surface 12d along the shaft guide surface. It is guided to 12c side.
[0029]
At this time, if the axle shaft 21 is inserted while being greatly inclined with respect to the axis of the shaft guide surface 12c, the outer periphery of the spline engagement portion 21a contacts the shaft guide surface 12c and cannot be inserted. In the process of inserting the shaft 21 into the shaft guide surface 12c, the deviation of the axis of the axle shaft 21 with respect to the axis of the shaft guide surface 12c is corrected, and the axle shaft 21 is shifted with respect to the axis of the shaft guide surface 12c of the shaft guide hub 12. Are inserted with their axes aligned.
[0030]
As a result, as shown in FIG. 4, the outer periphery of the spline engagement portion 21a formed at the tip of the axle shaft 21 comes into contact with the lip of the oil seal 2 mounted on the shaft guide surface 12c of the seal retainer 1. In addition, the oil seal 2 can be inserted into the shaft housing, the deformation and damage of the oil seal 2 can be prevented, and the oil tightness of the oil seal 2 can be guaranteed.
[0031]
Then, in the process of inserting the axle shaft 21 into the shaft housing, the gripping portion 22 that grips the axle shaft 21 has a distal end pressing surface 22a of the gripping portion 22 on the receiving surface 17a of the lever 17 protruding from the shaft insertion jig 11. Then, when the distal end pressing surface 22a presses the receiving surface 17a, a clockwise moment shown in FIG. 5 acts on the shaft insertion jig 11 as shown in FIG. Positioning ridges which are inclined in the same direction with the lower end of the rear surface of the shaft guide hub 12 abutting on the open end of the retainer 1 in the same direction and protrude from the rear surfaces of the half hubs 12a and 12b forming the shaft guide hub 12. The portion 12e is separated from the inner peripheral surface 1a of the seal retainer 1.
[0032]
Then, each half hub 12a, 12b receives the biasing force of the compression spring 15 interposed between the arms 13a, 13b connected to the respective half hubs 12a, 12b, and as shown in FIG. The shaft insertion jig 11 is expanded by a predetermined angle around the center, and is separated from the open end side between the half hubs 12 a and 12 b through the axle shaft 21 and the grip portion 22 that grips the axle shaft 21. The jig 11 is automatically removed from the seal retainer 1.
[0033]
On the other hand, the axle shaft 21 centered in a predetermined manner by the shaft insertion jig 11 is inserted while its posture is maintained by the grip portion 22 of the shaft insertion device, and the spline engagement portion 21a formed at the tip is inserted. After the spline engagement with the axle output shaft provided in the shaft housing, the grip of the axle shaft 21 by the grip portion 22 is released.
[0034]
As described above, according to the present embodiment, since the shaft insertion jig 11 is merely attached to the insertion opening of the seal retainer 1, the shaft insertion jig 11 does not come into contact with the oil seal 2, and the oil seal 2 is deformed. There is no damage.
[0035]
Further, the urging force of the compression spring 15 causes the positioning ridges 12e projecting from the rear surfaces of the half hubs 12a and 12b to be hooked on the inner peripheral surface 1a of the seal retainer 1, whereby the inner peripheral surface 1a of the seal retainer 1 is formed. Since the axis of the shaft guide surface 12c of the shaft guide hub 12 is made to coincide with the axis of the shaft, the centering becomes easy and a good assembling property can be obtained.
[0036]
Further, in the process of inserting the axle shaft 21 into the shaft housing while being gripped by the grip portion 22 of the shaft insertion device, the shaft insertion jig 11 is automatically detached from the seal retainer 1. In addition to eliminating forgetting to remove the jig 11, the step of removing the shaft insertion jig 11 becomes unnecessary, and the number of assembling steps can be reduced.
[0037]
Further, since the shaft insertion jig 11 can be used repeatedly, it is economical.
[0038]
【The invention's effect】
As described above, according to the shaft insertion jig of the present invention, not only is it possible to use repeatedly and it is economical, but also the workability is good because careful centering work is not required.
[0039]
In addition, the shaft insertion jig of the present invention can be attached without modifying the structure of the shaft and the inside of the shaft housing, so that it is not only excellent in versatility but also easy to handle.
[Brief description of the drawings]
FIG. 1 is a front view of a shaft insertion jig attached to a seal retainer. FIG. 2 is a front view of the shaft insertion jig when opened. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 5 is a partial cross-sectional side view showing a state where a shaft insertion shaft is detached from a seal retainer.
DESCRIPTION OF SYMBOLS 1 Seal retainer 1a Inner peripheral surface 2 Oil seal 11 Shaft insertion jig 12 Shaft guide hub (cylindrical guide member)
12a, 12b Half hub (half-split guide member)
12c Shaft guide surface 12d Tapered guide surface 12e Positioning ridge (positioning protrusion)
13a, 13b Arm 14 Support pin 15 Compression spring (spring member)
16 Support Bracket 17 Lever 17a Receiving Surface 18 Stay 21 Axle Shaft 21a Spline Engaging Part 22 Grip Part 22a Tip

Claims (3)

An oil seal is attached to an inner peripheral surface of a seal retainer attached to a shaft insertion opening of a shaft housing, and a shaft that guides a shaft having a spline engagement portion at a tip with respect to the inner peripheral surface in a state where the axes thereof are aligned. In the insertion jig,
A cylindrical guide member having a shaft guide surface on the inner periphery is provided,
An inner peripheral edge of the seal retainer is engaged with a surface of the cylindrical guide member that abuts an insertion opening of the seal retainer, and an inner peripheral surface of the seal retainer and the shaft guide surface of the cylindrical guide member. A shaft insertion jig provided with a positioning projection that matches the axis of the shaft insertion jig. The cylindrical guide member formed of a pair of half-shaped guide members divided into two semi-circles,
A spring member for urging the two half-shaped guide members in a direction away from each other,
An arm that supports the two half-shaped guide members in an openable and closable manner;
A lever portion that is connected to the arm and that can abut a grip portion that grips the shaft;
The shaft insertion jig according to claim 1, further comprising: The shaft housing is provided in a transmission case,
3. The shaft insertion jig according to claim 1, wherein the shaft is an axle shaft.

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