JPH0444427Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clutch in which the clutch disc or clutch cover is replaced after the main drive shaft is pulled out from the clutch disc. This invention relates to the structure of a clutch housing that is effective for performing work.

(Prior Art) In general, in industrial vehicles such as forklifts, the clutch disc is likely to wear out because the clutch is frequently engaged and engaged. To replace a worn clutch disk or clutch cover, move the main drive shaft 6 toward the transmission side and pull it out from the clutch disk 7, as shown in FIG. A method is generally practiced in which the clutch cover 8 is removed from the flywheel 4 and the clutch disc 7 is taken out using the formed replacement opening 2.

(Problem to be solved by the invention) By the way, when replacing the clutch disc 7, after pulling out the main drive shaft 6 from the clutch disc 7, the clutch cover 8 removed from the flywheel 4 is left in the clutch housing 1. Normally, the clutch disc 7 is replaced while the clutch disc 7 is in its original state, and the clutch cover 8 is attached to the flywheel 4 after the clutch disc 7 is replaced. Furthermore, even if both the clutch disc 7 and clutch cover 8 are to be replaced, the new clutch disc 7 and clutch cover 8 must be placed inside the clutch housing 1 before the main drive shaft 6 is replaced with the clutch disc 7. Prior to insertion, the clutch cover 8 must be lowered into the clutch housing 1 as shown in FIG.

However, in the conventional case, the clutch cover 8, which has a circular shape as shown by the imaginary line in FIG. 7, easily rolls within the clutch housing 1 and becomes misaligned. For this reason, after the clutch disc is assembled, it becomes difficult to align the clutch cover with respect to the flywheel when assembling the clutch cover to the flywheel, especially since the clutch cover is heavy and space is limited. The disadvantage is that the work of assembling the clutch cover is troublesome and time consuming.

Therefore, in view of the above problems, the present invention aims to add a function to the clutch housing to hold the clutch cover at a specific position on the clutch housing when replacing the clutch disk, etc., as a technical problem to be solved. be.

(Means for solving the problem) The technical means for solving the above problem is to form a pair of protrusions on the bottom of the inner surface of the clutch housing symmetrically with respect to a vertical plane passing through the center line of rotation of the flywheel. However, this protrusion is adapted to receive the lower outer periphery of the clutch cover when replacing the clutch disc or the like.

(Function) Therefore, when replacing the clutch disc or the like, when the clutch cover removed from the flywheel or the replaced new clutch cover is lowered into the clutch housing, the pair of protrusions receives it. This maintains the clutch cover with its center aligned directly below the center of rotation of the flywheel and prevents it from sliding or rolling.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. First, a clutch of the type in which the main drive shaft is replaced by pulling it out from the clutch disk will be described. Reference numeral 1 denotes a clutch housing having an opening 2 at the top for replacing a disk, and this opening 2 is normally closed by a housing cover 3. A flywheel 4 connected to a crankshaft (not shown) is housed in the front side of the clutch housing 1 (on the left side in FIG. 1), and a main drive shaft 6 is connected to a pilot bearing 5 provided at the center of the flywheel 4. The front end is inserted so that it can be pulled out. A spline 6a is formed on the front end side of the main drive shaft 6, and a clutch disk 7 is removably engaged with the spline 6a.

In addition, a clutch cover 8 is attached to the flywheel 4.
is arranged so as to cover the clutch disk 7, and its peripheral edge is attached via a number of set bolts 9, and its attachment position relative to the flywheel 4 is determined by a knock pin 10. A window hole 8a is opened in the center of the clutch cover 8 in correspondence with the main drive shaft 6, and a release lever 12 is connected to the peripheral edge of the window hole 8a via a fulcrum pin 11.
are pivotally mounted at regular intervals along the periphery of the window hole 8a. Further, a pressure plate 13 is supported at one end on the outer diameter side of the release lever 12 so as to be movable back and forth, and this pressure plate 13 is supported by a spring 14 interposed between it and the clutch cover 8. The clutch disk 7 is always biased in a direction that presses the flywheel 4 into contact with the clutch disk 7. Also,
One end of the release lever 12 on the inner diameter side is provided so as to face the inside of the clutch housing 1 through the window hole 8a,
It can come into contact with a bearing collar 16 via a release bearing 15.

On the other hand, a release hub bracket 17 is fixed to the rear cover 1a at the rear end (transmission side) of the clutch housing 1 via bolts 18.
It consists of a hub portion 17a and a cylindrical bracket portion 17b extending into the clutch housing 1 from the hub portion 17a. A retainer 19 that engages with a spline 6b formed on the rear side of the main drive shaft 6 is rotatably attached to the hub portion 17a via a bearing 20, and this retainer 20 is connected to the transmission via a universal joint 21. is connected to the input shaft 22 of. A flanged nut 23 that screws into the threaded portion formed at the rear end of the main spline shaft 6 is freely rotatably attached to the retainer 19 via a nut stopper 24. By rotating the main drive shaft 6 using the main drive shaft 6, the main drive shaft 6 can be moved in the axial direction. In other words, the main drive shaft 6 is inserted and removed by rotating the flanged nut 23 on the transmission side, which is similar to the known structure (for example, see Utility Model Application No. 60-24935). It is.
Further, a bearing collar 16 is fitted to the bracket portion 17b so as to be slidable in the axial direction via a shift fork (not shown), and is fitted to the inner diameter side of the release lever 12 via the bearing collar 16 and the release bearing 15. One end can be pressed toward the inside of the clutch cover 8 (flywheel side).

A pair of protrusions 25 are formed at the bottom of the clutch housing 1, specifically directly below the clutch cover 8, for receiving the clutch cover 8 when replacing the clutch disc 7, etc. The protrusions 25 are symmetrically opposed to each other across a vertical plane passing through the center line of rotation of the flywheel 4. That is, as shown in FIG. 2, the pair of protrusions 25 are formed to have a chevron-shaped cross section, and extend parallel to each other with an appropriate width in the front-rear direction (direction of the rotation center line). The apex faces the circular outer periphery of the clutch cover 8 assembled to the flywheel 4 with a minimum required distance S (a distance that can avoid contact during rotation). In addition, in this embodiment, the clutch housing 1
The bottom surface has a flat surface with a certain width in the lateral direction at least directly below the rotation center line, so
The spacing and height of the projections 25 are set so as to ensure a distance S1 that prevents the outer peripheral edge of the clutch cover 8 from coming into contact with this flat bottom surface when the clutch cover 8 is received.

This embodiment is configured as described above,
The replacement work of the clutch disk 7 will be explained below with reference to FIGS. 3 and 4. With the housing cover 3 removed and the opening 2 open, first,
The clutch cover 8 is removed from the flywheel 4 by sequentially removing the set bolts 9.
After detachment, when the housing cover 3 is lowered directly below and received by the pair of protrusions 25, the center of the clutch cover 8 is maintained in alignment with the rotation center line of the flywheel 4 and directly below it. At this time, since the clutch cover 8 is heavy on the rear side, the clutch cover 8 is tilted in that direction and pushed to a position where the release collar 16 comes into contact with the hub portion 17a.
Can be supported in a tilted position. Therefore, the upper part of the clutch cover 8 is opened, and the clutch disc 7 becomes replaceable.

Next, by rotating the flanged nut 23 using an appropriate tool on the transmission side, the main drive shaft 6 is moved rearward and its front end is removed from the pilot bearing 5, and the spline 6a is removed. Remove it from the clutch disk 7. Thus, the clutch disk 7 was removed from the main drive shaft 6.
is removed from the clutch housing 1 and replaced with a new one, and the replaced clutch disc 7 is assembled to the main drive shaft 6 by performing the operations in the reverse order described above.

After assembling the clutch disc 7, place the clutch cover 8 against the flywheel 4 by attaching it to the dowel pin 10.
It is fixed by sequentially tightening the set bolts 9 after positioning.
In this case, the clutch cover 8 has been received by the protrusion 25 of the clutch housing 1 in a state where it is prevented from shifting or rolling, so when assembling it, it is only necessary to lift the clutch cover 8 by a small amount. This makes it possible to easily align the center with respect to the flywheel 4.

Although the above explanation is for replacing the clutch disc 7, the same applies to replacing the clutch cover 8. In other words, clutch cover 8
is housed in the clutch housing 1 before assembling a new clutch disc 7 to the main drive shaft 6. At that time, the positional relationship with respect to the flywheel 4 is specified in advance, and the clutch disc 7 is received by the protrusion 25. By accepting the
Subsequent assembly can be facilitated.

5 and 6 respectively show other embodiments of the shape of the protrusion for receiving the clutch cover of the present invention, and in both cases, die cutting is required when casting the clutch housing 1. It is set in an easy shape. That is, in the embodiment shown in FIG. 5, the clutch housing 1 has a circular bottom surface, and the bottom surface has a protrusion 25 that is symmetrical with respect to a vertical line passing through the center to form a central recess 25a. It is also the sixth
In the embodiment shown in the figure, the bottom surface of the clutch housing 1 is a flat surface, and an arcuate recess 2 is provided at the center of the bottom surface.
5a, and the connecting portion between the arcuate recess 25a and the flat surface is a symmetrical protrusion 25. In either case, the clutch is closed in the same way as the protrusion 25 in the previous embodiment. It is possible to maintain the clutch cover 8 in a stable state when the disk 7 is replaced.

Note that there is no problem even if the main drive shaft 6 is pulled out by a method other than that shown in the drawings.

(Effects of the invention) As detailed above, according to the invention, the center of the clutch cover that has been removed from the flywheel when replacing the clutch disc, etc., or the new clutch cover that has been replaced is aligned with the center of rotation of the flywheel. The clutch cover can be held in alignment directly under the clutch disc, preventing it from shifting laterally or rolling during replacement work, making it easy to align the clutch cover when assembling it to the flywheel in the final stage. becomes possible. This improves work efficiency when replacing clutch discs and the like, which is carried out within a limited space, and greatly contributes to reducing work time and improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing the front side of the clutch cover, Fig. 3 is a cross-sectional view showing the state of replacing the clutch disc, etc., and Fig. 4 is a cross-sectional view showing the state of replacing the clutch disc etc. FIG. 5 and FIG. 6 are explanatory views showing other embodiments of the protrusion of the present invention, and FIG. 7 is an explanatory view showing a conventional example. 1...Clutch housing, 2...Opening, 4
... flywheel, 6 ... main drive shaft, 7 ... clutch disk, 8 ... clutch cover, 25 ... protrusion.

Claims (1)

[Scope of utility model registration request] A pair of protrusions are formed on the bottom of the inner surface of the clutch housing symmetrically with respect to a vertical plane passing through the center line of rotation of the flywheel, and these protrusions receive the lower outer periphery of the clutch cover when replacing the clutch disc, etc. The structure of the clutch housing is designed to