JPH047845Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sprocket gear holder for holding a sprocket gear used in an automobile transfer device or the like during assembly.

(Prior art) In an automobile transfer system, the sprocket shaft that serves as the rear wheel output shaft and the sprocket shaft that serves as the front wheel output shaft are sprocket chains that span sprocket gears provided on both sprocket shafts. are connected via. When these sprocket shafts are assembled into a transfer case, it is customary to assemble them with a sprocket chain spanning both sprocket gears. The sprocket chain was placed under tension using an appropriate jig and then assembled into the transfer case.

(Problems to be solved by the invention) When assembling the sprocket chain to the transfer case in a tensioned state as in the above-mentioned prior art, the
Since it is extremely difficult to position both sprocket shafts, which are connected by a tensioned sprocket chain, assembly work requires skill, which is a major hurdle in improving work efficiency.

This invention was made in view of the above points,
The purpose of this is to make it extremely easy to assemble the sprocket shafts by holding the sprocket chain under tension and adjusting the distance between the sprocket shafts as appropriate. be.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, a sprocket shaft is constructed to engage and hold a pair of sprocket shafts each having a sprocket gear over which a sprocket chain is spanned. On the jig body,
A screw unit having heads at both ends that abuts each sprocket shaft from the inside and configured to adjust the distance between the two heads is provided, and a rotation lever for screwing the screw unit. is attached.

(Function) In the present invention, the following effects can be obtained by the above means.

In other words, the pair of sprocket shafts that are engaged and held in the jig body are moved relative to each other in a direction that separates them from each other by the screw unit that is screwed by the rotation operation of the rotation lever, thereby tensioning the sprocket chain. State and make. When assembling the sprocket shaft at a predetermined position on the mating member (for example, a transfer case) under this condition, the screw unit that is threadedly rotated by the rotation operation of the rotary lever is used to secure the space between the two sprocket shafts. It is assembled by adjusting the distance and aligning as appropriate. Therefore, the work of assembling the sprocket shaft can be carried out extremely easily.

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

The sprocket gear holder A of this embodiment has the first
As shown in the drawings and FIG. 2, this is used when assembling a sprocket shaft 2, which will become a rear wheel output shaft, and a sprocket shaft 3, which will become a front wheel output shaft, to a transfer case 1. Sprocket gears 4 and 5 are provided on these sprocket shafts 2 and 3, respectively, and a sprocket chain 6 is spanned between both sprocket gears 4 and 5. Numbers 7 to 10 are ball bearings,
11 to 13 are gears. An input shaft 14 to which the sprocket shaft 2 is to be connected is pivotally supported on the transfer case 1 side via a ball bearing 15. The transfer case 1 also has bearing holes 16 and 17 into which the lower ball bearing 8 of the sprocket shaft 2 and the lower ball bearing 10 of the sprocket shaft 3 are fitted.
is formed. When the sprocket shafts 2 and 3 are assembled, the transfer case 1 is supported by the support jig 37 with the bearing holes 16 and 17 facing upward.

The sprocket gear holder A is provided with a plate-shaped jig main body 18 that engages and holds the sprocket shafts 2 and 3, and is provided on the jig main body 18, and is attached to each of the sprocket shafts 2 and 3. The screw unit 19 has heads 22 and 23 at both ends that abut from the inside, and a rotation lever 24 for screwing the screw unit 19.

As shown in FIG. 2, cutout holes 25 and 26 are formed in the jig main body 18 for engaging and holding the sprocket shafts 2 and 3 directly above the sprocket gears 4 and 5, Double notch hole 2
Reference numerals 5 and 26 refer to guide portions 25a and 26a on the entrance side that have large openings to facilitate insertion of the sprocket shafts 2 and 3, and locking portions 25b that engage and hold the sprocket shafts 2 and 3. 26b. The sprocket shaft 2 is engaged and held in the locking portion 25b of one notch hole 25 in a state where the relative distance with the sprocket shaft 3 cannot be changed, while the locking portion 26 of the other notch hole 26
In b, the sprocket shaft 3 is engaged and held in such a manner that the relative distance with the sprocket shaft 2 can be changed. Reference numeral 27 is a handle for lifting the jig main body 18.

The screw unit 19 has a cylindrical rotating member 2.
0, a screw member 21 rotatably screwed onto one end of the rotary member 20, a head 22 pivotally supported on the other end of the rotary member 20, and the screw member 2.
The head 23 is fixed to the distal end side of the sprocket shaft 1, and the heads 22 and 23 are provided so that they can come into contact with the sprocket gears 4 and 5 of the sprocket shafts 2 and 3 from the inside. The contact surfaces of these heads 22, 23 are arcuate along the outer peripheral surfaces of the sprocket gears 4, 5,
At its upper end, claw parts 22a and 23a are integrally inserted between the lower surface of the jig main body 18 and the upper surface of the sprocket gears 4 and 5 to prevent the sprocket shafts 2 and 3 from swinging. It is installed protrudingly.

Further, locking pins 28 and 29 are provided protrudingly on the upper surfaces of the heads 22 and 23, respectively, and these locking pins 28 and 29 are connected to elongated holes 30 and 31 formed in the jig main body 18. By locking, the screw unit 19 can be attached to the jig main body 18. These long holes 30,
31 are both formed parallel to the notched holes 25 and 26, and the screw unit 19 is movable while being guided by these elongated holes 30 and 31. Note that a guide portion 31a that is bent toward the notch hole 26 is formed at the inner end of one of the elongated holes 31 (that is, the side closer to the notch hole 26).
The locking pin 29 (in other words, the head 23) can be moved toward the notch hole 26 (in other words, the sprocket shaft 3) by being guided by the locking pin 29 (in other words, the head 23).

The rotating lever 24 is coupled to the rotating member 20 of the screw unit 19, passes through a guide hole 32 (parallel to the elongated holes 30 and 31) formed in the jig main body 18, and extends above the jig main body 18. It is configured to extend approximately along the guide hole 32.
It is said to be able to rotate within a 90° range. Thus, the screw member 21 is moved forward and backward by the rotation of the rotation member 20 in conjunction with the rotation operation of the rotation lever 24, and the screw member 21 is moved forward and backward to move the screw member 21 between the heads 22 and 23 of the screw unit 19. The relative distance can be changed. That is, by rotating the rotating lever 24 in the direction of arrow M in FIG. 2, the relative distance between both heads 22 and 23 of the screw unit 19 is increased, and the sprocket gear
The sprocket chain 6, which spans over the sprocket chain 5, is now under tension.

The sprocket shafts 2, 3 are held using the sprocket gear holder A having the above structure, with each sprocket shaft 2, 3 supported on a pedestal 33, as shown in FIG. The pedestal 33 is the base part 3
4, and a pair of bearing parts 35 and 36 provided on the base part 34. One bearing part 35
The sprocket shaft 2 is fitted and supported on the other bearing part 36, and the sprocket shaft 3 is fitted and supported on the other bearing part 36. Note that the other bearing portion 36
The inside has a large diameter so that the sprocket shaft 3 can be fitted loosely therein, and the upper part of the inside is a movable part 36a that is movable in the radial direction. The movable part 36
A is connected to a piston rod 39 of an air cylinder 38, and is movable in the radial direction (ie, between the position shown by the chain line in FIG. 3 and the position shown by the solid line in FIG. 3) by the operation of the air cylinder 38. With this configuration, when fitting and supporting the sprocket shafts 2 and 3 in the bearing parts 35 and 36, respectively,
The movable part 36a is moved to the retracted position (dash line position in Figure 3).
By doing so, the sprocket shaft 3 is connected to the bearing part 3.
6 (at this time, the sprocket chain 6 is in a relaxed state), and then the movable part 36a is moved forward by the operation of the air cylinder 37, thereby removing the sprocket shaft 3 from the sprocket shaft 2. By pressing in the direction of separation, the sprocket chain 6 can be placed in a tensioned state.

Next, the operation when assembling the sprocket shafts 2 and 3 to the transfer case 1 using the illustrated sprocket gear holder A will be explained.

First, as shown in FIG.
The sprocket shafts 2 and 3 are fitted into and supported by the sprocket shafts 5 and 36, respectively. At this time, the sprocket chain 6, which is stretched between the sprocket gears 4 and 5, is kept in tension by the operation of the movable portion 36a of the bearing portion 36 by the operation of the air cylinder 38. The sprocket shafts 2 and 3 in this state are held by the sprocket gear holder A, and the procedure is as follows.

That is, after inserting and engaging the right upper parts of the sprocket gears 4 and 5 on the sprocket shafts 2 and 3 into the notch holes 25 and 26 of the jig main body 18, respectively,
Move the screw unit 19 between the sprocket shafts 2 and 3 along the elongated holes 30 and 31 to tighten the head 2.
2 and 23 are brought into contact with the sprocket gears 4 and 5, and then the rotary lever 24 is rotated to separate the heads 22 and 23 of the screw unit 19 from each other. , 5 to keep the sprocket chain 6 tensioned. In this way, the sprocket shafts 2 and 3 are engaged and held by the sprocket gear holder A.

In this way, the sprocket gear holder A, which engages and holds the sprocket shafts 2 and 3, is attached to the receiving jig 3.
After moving the sprocket shafts 2 and 3 above the transfer case 1 supported by the transfer case 1, the sprocket shafts 2 and 3 are moved to the predetermined positions (i.e., the bearing holes 16 and 17) of the transfer case 1 using a press device (not shown) or the like. When assembling, the pitch between the bearing holes 16 and 17 and the pitch P between the sprocket shafts 2 and 3 that are engaged and held by the sprocket gear holder A.
It is necessary to assemble the parts in the same position. Therefore, by rotating the rotation lever 24, the relative distance between the heads 22 and 23 of the screw unit 19 can be adjusted appropriately, and the sprocket gear holder A can be adjusted.
was lowered so that the ball bearings 8, 10 on the lower side of the sprocket shafts 2, 3 faced the bearing holes 16, 17 of the transfer case 1, respectively (in other words, the pitch of the bearing holes 16, 17 and the sprocket shaft After aligning the pitch P between 2 and 3), the sprocket shafts 2 and 3 are press-fitted to complete the assembly of the sprocket shafts 2 and 3 to the transfer case 1 with the sprocket chain 6 stretched. It is.

When the assembly of the sprocket shafts 2 and 3 is completed, the rotary lever 24 is rotated in the direction of the arrow N in FIG. After releasing, the sprocket gear holder A holds the sprocket shaft 2, along the notch holes 25, 26 of the jig main body 18.
They are forced to leave from 3.

As described above, according to this embodiment, the pitch P between the sprocket shafts 2 and 3 that is engaged and held by the sprocket gear holder A is controlled by the rotation lever 24.
The sprocket shafts 2 and 3 can be assembled to the transfer case 1 while the sprocket chain 6 is stretched, adjusting as appropriate by the forward and backward movement of the screw unit 19 as the screw unit 19 rotates. , the assembly work efficiency is significantly improved.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that the design can be changed as appropriate without departing from the gist of the invention.

(Effect of the invention) As described above, according to the invention, the pair of sprocket shafts that are engaged and held in the jig body are separated from each other by the screw unit that is threadedly rotated by the rotation operation of the rotation lever. The sprocket chain, which is stretched between the sprocket gears of both sprocket shafts, is brought into a tensioned state by moving the sprocket chain relatively in the direction shown in FIG. When assembling the sprocket shafts, the distance between the two sprocket shafts can be adjusted appropriately using the screw unit that is screwed by the rotation operation of the rotary lever, and the sprocket shafts can be aligned and assembled. This makes it possible to easily assemble the sprocket shaft while the chain remains tensioned, which has the practical effect of significantly improving the efficiency of assembling workers.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the state when a sprocket shaft is assembled using a sprocket gear holder according to an embodiment of the present invention, and FIG. 2 is a view of the sprocket gear holder shown in FIG. 1. The top view and Figure 3 are as follows:
FIG. 2 is a longitudinal sectional view showing a state in which a sprocket shaft is engaged and held in a sprocket gear holder according to an embodiment of the present invention. 2... Sprocket shaft (rear wheel side output shaft), 3...
...Sprocket shaft (front wheel side output shaft), 4, 5...
Sprocket gear, 6... Sprocket chain, 18... Jig body, 19... Screw unit,
22, 23...head, 24...rotating lever.

Claims (1)

[Scope of utility model registration request] A jig body configured to engage and hold a pair of sprocket shafts, each having a sprocket gear over which a sprocket chain is stretched, and a jig body provided on the jig body and abutting each of the sprocket shafts from the inside. A sprocket gear comprising: a screw unit having heads at both ends and configured such that the distance between the two heads can be adjusted; and a rotation lever for screwing the screw unit. Retainer.