JPH02154814A - Cover for propeller shaft - Google Patents

Abstract

PURPOSE:To aim at the simultaneousness of fitting and whirl-stop and removal at one step by providing a first cover end part with a circumferential protrusion with an engagement hole and a second cover with a slit for inserting this protru sion through circumferentially and an extension part having an axially movable recessed part. CONSTITUTION:Three engagement parts 21 are provided at the supporting part 20b of a fitting ring 20, and at the respective tip claws 21a of the engage ment parts and a step part 20d, the fitting ring 20 is supported at an outer wheel member in the axial direction as well as a protrusion 24 formed of a circumferential part 22, extending circumferentially, with an engagement hole 22a and an axial part 23 is protrusively provided. In addition, a second cover 30 is formed of a cylindrical part 30a externally fitted at the supporting part 20b and a bellows part 30b, and an expansion part 32 accommodating the protru sion 24 movably and a slit 34 are formed at the opening of the bellows part 30b. Accordingly, the cover can be removed easily and positively at one step as well as whirl-stop can be made simultaneously with fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a propeller shaft cover that covers, for example, a propeller shaft connecting an output shaft of a tractor and an input shaft of a working machine for the purpose of ensuring safety and preventing dust.

<Prior art> Conventionally, there is a propeller shaft cover of this type as shown in Fig. 9 (Japanese Patent Publication No. 5B-36212).
Publication No.). This propeller shaft cover 101 has a cylindrical shape and a second cover 103 that covers the propeller shaft 102.
and a second cover 105 that has a substantially trumpet shape and covers the end portion 104 of the propeller shaft 102. And the second above
The fitting part 105a of the cover 105 is connected to the first cover 103.
The first and second covers 103 and 105 are fixed together by being fitted inside. Cylindrical portion 105 of the second cover 105
A rear race cover 106 is fitted and fixed to the rear race cover 106, and a front race cover 107 is fixed to the end 106a of this rear race cover 106 so as to form a predetermined annular space 110 and face each other in the axial direction. are doing. A ball holder 108 is fixed to the radially inner end of the front race ski y<-107 with brazing or the like.
, 109. ... is maintained. A coil spring 111 and a slide ring 112 that is axially biased by the coil spring 21 and movable in the axial direction are arranged in the annular space 110. The front race cover 107 is provided with a cutout 107a, and from this cutout 107a, the slide ring 1
A lever 113 axially protruding from 12 is axially protruded to the outside. A radial notch 114 is provided at a predetermined position in the axial direction of this lever 113, and when the lever is pushed in the axial direction and then rotated in the circumferential direction, this notch 114 is inserted into the cutout portion 1 of the front race cover 107.
07a, the slide ring 11
2 can be held in a state where it is pushed in in the axial direction of a predetermined dimension. A ball pressing portion 115 is provided at the end of the slide ring 112. Then, the stepped portion 112a of the slide ring 112 is connected to the coil spring i.
The front race cover 107 is biased in the axial direction by tt.
The above ball 109.109. The balls 109, 109.
...is pressed in the radial direction. In other words, the propeller shaft cover lot is attached to the propeller shaft 102.
It is attached to. Then, by operating the lever 113 from the outside through the operation hole 105c of the second cover 105, the slide ring is released! 12 is pushed in and locked, the position of the ball holding part 115 is adjusted to the ball 109,
109. The ball 10 is fitted into the raceway 116 of the propeller shaft 102 with a deviation in the axial direction from...
9,109. ... is made movable in the radial direction, and the propeller shaft cover lO1 is removed from the propeller shaft 102 in the axial direction. And the propeller shaft 1 of the propeller shaft cover 101
02 is attached to balls 109, 109. Push the propeller shaft force /(-101 in the axial direction until ... coincides with the position of the orbit 116, and in that state, rotate the locked lever 113 in the circumferential direction to release the lock. Due to the action of the coil spring 111, the slide ring 112 is returned to the position before being pushed in.
The above balls 109, 109. ... into the raceway 116 and hold them so that they cannot move in the radial direction, and the balls 109,
109. ... by locking the track 116. The propeller shaft cover rotatably fixed to the propeller shaft 102 is connected to a stationary member by another member to prevent rotation, so that the propeller shaft 102 rotates with the propeller shaft cover 101 stationary. I try to cover it.

<Problems to be Solved by the Invention> However, the above conventional propeller shaft cover 10
1 requires a coil spring 111 and a slide ring 112, so there is a problem in that the number of parts constituting the cover increases.

Furthermore, since the propeller shaft cover 101 is attached and detached by operating the lever 113, the second cover 105 requires an operation hole 105c.
There was a problem that foreign matter such as dust entered the inside from 5c. Further, it is difficult to attach and detach the cover to the propeller shaft 102 by operating a lever through the narrow operation hole 105c, and there is a problem that attachment and detachment cannot be performed with one touch.

Further, the attachment of the propeller shaft cover lO1 to the propeller shaft 102 and the rotation prevention must be performed separately, and it is not possible to perform the attachment and rotation prevention at the same time.

Therefore, an object of the present invention is to be able to be configured with a small number of parts, to be able to be easily and reliably attached and detached with one touch without using any special tools, and to be able to be attached and prevented from rotating at the same time. An object of the present invention is to provide a highly safe propeller shaft cover that can reliably cover a propeller shaft and a joint portion of the propeller shaft. An engaging member is formed in a cylindrical shape to cover the shaft, has an end supported by the joint of the propeller shaft, and is movable in the radial direction to engage with the joint of the propeller shaft. a first cover having a joint;
A propeller including a second cover that is externally fitted onto the first cover so as to be movable in the axial direction, presses the engaging portion to engage the engaging portion and the joint portion with each other, and covers the sideward portion. A cover for a shaft, the cover comprising:
A circumferential protrusion extending in the circumferential direction and having an engagement hole is provided at an end of the cover, and the second cover has a slit on a side thereof through which the circumferential protrusion passes through, and the second cover A bulge forming an axially movable recess is provided.

Function> When installing this propeller shaft cover, first, the end of the first cover is aligned with a predetermined position of the sloped portion of the propeller shaft while the first cover covers the propeller shaft. Next, the second cover is moved in the axial direction with respect to the first cover so as to cover the joint portion. At this time, since the second cover is provided with a bulge that forms a recess in which the protrusion of the first cover can move in the axial direction, the second cover moves the protrusion into the bulge. To smoothly move in the axial direction with respect to the first cover without any hindrance while being stored.

Then, due to the movement of the second cover in the axial direction, the engaging portion of the first cover is pressed and moved in the radial direction, and engages with the joint portion of the propeller shaft in one touch. As a result, the end portion of the first cover is engaged with and supported by the joint portion of the propeller shaft through the retaining portion, thereby covering the propeller shaft. Next, the second cover is rotated in the circumferential direction with respect to the first cover, so that the circumferential protrusion is inserted in the circumferential direction into a slit provided on a side surface of the bulged portion, and is brought into contact with an edge of the slit. to lock in the circumferential direction. Thereby, the second cover is axially supported by the first cover at a predetermined axial position.

Further, as a result, the slit is closed, and the engagement hole of the circumferential projection is positioned at an appropriate position outside the bulge.

A locking member connected to the stationary member is inserted into the locking hole, and the locking member locks the circumferential protrusion in the circumferential direction and prevents it from coming out of the slit in the circumferential direction. Thereby, the second cover is supported so as not to rotate relative to the first cover in the circumferential direction. Therefore, the second cover is integrally locked with the first cover supported by the joint of the propeller shaft, is supported by the propeller shaft via the first cover, and covers the joint. In other words, the first cover and the second cover can be attached to the propeller shaft with one touch.

The first cover and the second cover, which are thus locked together and attached to the propeller shaft, are simultaneously stopped from rotating relative to the propeller shaft by being locked by the locking member.

Removal of the first and second covers is performed in the reverse procedure to the above. First, remove the engaging member engaged with the locking hole of the circumferential projection of the first cover to release the circumferential lock. and the second above
The cover is rotated in the circumferential direction relative to the first cover. Then, the circumferential protrusion is removed from the slit of the second cover, and the protrusion is positioned in the bulge. Next, the second cover is moved in the opposite axial direction with respect to the first cover, and the second cover is moved in the opposite axial direction to the first cover.
Release the cover from pressing the engaging portion of the first cover. Then, the engaging portion moves in the radial direction, thereby releasing the mutual engagement with the joint portion. Next, with the moved second cover fitted onto the outside, the end of the first cover is pulled away from the joint part in the axial direction to complete the removal of the first and second covers from the propeller shaft.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a longitudinal cross-sectional view of the main part of the propeller shaft cover of the present invention, and l represents the propeller shaft. This propeller shaft 1 is composed of a shaft portion 2, a forked arm portion 3, and a bearing portion 4, and rotates by being transmitted with power from a tractor (not shown).

The shaft portion 2 has a square pipe-shaped inner member 2a and an outer member 2b.
They are telescopically fitted into each other and are provided so as to be freely expandable and contractible in the axial direction, but not to rotate relative to each other. The forked arm portion 3 is approximately U-shaped with two arm portions 6, 6 parallel to the axis, and corresponds to the bottom of the U-shape, and the end surface of the base portion 7 has an axial cylindrical surface 7a on the outer periphery. It has a prismatic fitting hole 7b in the center that penetrates in the axial direction. Then, the end portion of the inner member 2a is fitted into this fitting hole 7b, and they are integrally attached by welding. In the cylindrical surface 7a of the base 7, an annular groove whose cross section forms part of a circle is formed in the circumferential direction, and one raceway 7c of the bearing part 4 is formed by this annular groove.

Further, the base 7 has an annular outer ring member 8 having one shoulder in the axial direction protruding toward the inner circumferential side so as to have an oval cross-sectional shape, and having a circumferential track 8a opposite to the track 7c on the inner circumference. are installed at predetermined intervals in the radial direction. Between the pair of raceway surfaces 7 c and 8 a, balls t o, t o, . , the above-mentioned track 7c, and the retainer 9. The bearing portion 4 is formed by the balls 10 and the outer ring member 8. As a result, the outer ring member 8 is supported by the forked arm portion 3 in a freely rotatable manner. The outer ring member 8 (the outer ring member 8 is split in a radial plane parallel to the axis at one predetermined location in the circumferential direction, so that the diameter can be expanded elastically in the circumferential direction. Therefore, the outer ring member 8
The balls 10.1G, . . . can be easily accommodated in the raceway surface 8a.

The inner diameter d of the shoulder on the arm 6 side of the outer ring member 8 is set slightly larger than the diameter of the cylindrical surface 7a, which prevents foreign matter from entering the raceway surfaces 7c and 8a from the arm 6 side. It is designed to prevent The end portion of the shaft portion 2, the forked arm portion 3, and the bearing portion 4 form a joint portion A of the propeller shaft.

The two arm parts 6, 6 parallel to the axis of the bifurcated arm part 3 are provided with fitting holes 6a, 6a that penetrate in a direction perpendicular to the axes of the base part 7 and the shaft part 2, respectively. .

Then, in this fitting hole 6a, a cross shaft 11 having a cross shape in which two axes are orthogonal to each other and having bearing parts 12a, 12a, 12b, 12b that rotate around the respective axes at the four tip ends of the cross shaft 11 is inserted 180 degrees. the two separated bearing parts 12a,
12a are fitted inside and are rotatably attached to each other.

The remaining two bearing parts 12b, 12b, which are perpendicular to the bearing parts 12a, 12a of the cross shaft 11, have the forked arm part l.
Provided in the arm parts 13, 13 of the mounting device 16, which has two arm parts 13, 13 parallel to the axis and having the same shape as l, and has a spline hole i5 penetrating in the axial direction at the center of the outer end surface of the base part 14. The fitting holes 13a, 13a are fitted to each other so as to be rotatable with each other. Then, the arm portion 6.6 of the fork arm portion 3, the cross shaft 11, and the arm portion 13 of the mounting device 16.
and form a universal joint B. Thereby, the rotation of the propeller shaft 1 is smoothly transmitted to the mounting device 16 via the cross shaft ti even when the axis of the propeller shaft 1 and the axis of the mounting device 16 are at an angle of deviation. A spline portion provided on an input shaft of a working machine (not shown) for cultivating or the like is fitted into the spline hole 15. In the fitted state, the spline portion of the input shaft is engaged by screwing a screw (not shown) into a screw hole 14a provided in the side surface of the base 14 so that a portion intersects with the spline hole. It is stopped and locked to prevent it from coming out.

The outer ring member 8 of the bearing part 4 is attached to a ring 20 (second The support portion 20b (see Figure (a)) is removably fitted onto the outside. A stepped portion 20d formed between the supporting portion 20b and the fitting portion 20a is brought into contact with the end surface of the outer ring member 8.

Hereinafter, the above-mentioned installation of the ring 20 will be explained with reference mainly to FIGS. 2(a) and 3(a).

The support portion 20b includes three engaging portions 21.21.21.21.21.21.21.21.21.21.21.21.21.21.21.21.21.21..
... has been established. As shown in FIG. 1, the engaging portions 21.21. The claws 21a, 21 at the tip of...
a, . The ring 20 itself is supported in the axial direction with respect to the outer ring member 8 by sandwiching the outer ring member 8 between the rings 20d and 20d. As shown in FIG. 2(a), each of these engaging portions 21 is provided so that in its natural state, it forms a predetermined angle with the outer peripheral surface of the support portion 20b and elastically expands in the radial direction. The second
As shown in Fig. 2(b) and Fig. 2(c) (Fig. 2(b)
) and (c) respectively have the shapes shown in FIG. Then, when an external force acts and is pressed radially inward,
The first
As shown in the figure, it is adapted to engage with the outer ring member 8. Then, when the pressure is removed, it opens again in the radial direction and returns to the above-mentioned natural state position.

Further, as shown in FIG. 3(a), i point out of three circumferential positions that are out of phase by 60 degrees with each of the engaging portions 21, 21; 4 has a protrusion 24 protruding from the circumferential portion 22 which extends in the circumferential direction and has an engagement hole 22a, and an axial portion 23 which is connected to the circumferential portion 22 and extends in the axial direction (see FIG. 2). a)). In addition, at the remaining two of the three circumferential positions above,
Approximately long cylindrical projections 25 and 25 are provided respectively. The axial width t of this protrusion 25.25 and the axial thickness t of the circumferential portion 22 of the protrusion 24 are approximately the same, and the circumferential portion 22 and the two protrusions 25. The axial positions of the support portions 20b coincide with each other. Further, as shown in FIG. 2(a), at the end of the support portion 20b, contact portions 26, 26. ... has been established. These contact portions 26, 26. As shown in FIG. 3(a), the .
have. Then, the protrusion 24 and the protrusion 25.
25 to an appropriate width (WISvt in the figure).
(see). Circumferential portion 22 of the projection 24
and the projections 25.25 are connected to the abutting portions 26, 26.・・・
It is provided at an appropriate distance in the axial direction from the boundary line with the support portion 20b. On the other hand, as shown in FIG. 1, the fitting part 20a has a smaller diameter than the supporting part 20b, and has an inner diameter large enough not to hinder the rotation of the propeller shaft l. ing. A projection 20a projects from the axial support portion by a predetermined dimension in the radial direction.
-1.

The protrusion 20a-1 has a substantially circular shape with a chamfer that decreases in height toward the side opposite to the axial support portion 20b, as shown in FIG. 3(a). Circumferential direction 90
There are four for each degree.

The fitting part 20a is formed of elastic plastic and is provided in a telescopic shape so as to be freely expandable and contractible in the axial direction, and is provided with an inner member 27a of a cylindrical member 27 consisting of a cylindrical inner member 27a and an outer member 27b. The end of the is fitted externally. The protrusion 20a-1 is fixed integrally by being engaged with an engagement hole 27a-1 provided at a position corresponding to the protrusion 20a-1 at this end. As a result, this cylindrical member 27 is attached to the fitting portion 2 of the ring 20.
The propeller shaft 1 is supported and attached to the propeller shaft 1 with its axes aligned without contacting the propeller shaft 1. This attachment takes place elastically. Since the protrusion 20a-1 protrudes by the predetermined dimension smaller than the wall thickness of the inner member 27a, it does not interfere with the expansion and contraction movement of the outer member 27b and the inner member 27a. This cylindrical member 27 and the mounting ring 20 form a first cover 28 .

As shown in FIG. 1, the engaging portions 21, 21. ... is attached to the outer ring member 8. The first cover 28 is attached to the support portion 20b of the ring 20, which is made of plastic, and is connected to the cylindrical portion 30a and is attached in the axial direction. The cylindrical portion 30a of the second cover 30, which is provided with a bellows-shaped portion 30b that widens in a V-shape toward the member 16 side, is fitted onto the outside. The universal joint B is covered around the bellows-shaped portion 30b. A substantially conical cylindrical base portion 30b of the bellows-shaped portion 30b
The inner surface of the first cover 28 is brought into contact with the contact portion 26 of the first cover 28. The cylindrical portion 30a of the second cover 30 is movable in the axial direction with respect to the support portion 20b and is tightly fitted onto the outside, and is directed axially toward the mounting device 16 as shown by arrow a in the figure. The support part 2 is moved by
0b, the above-mentioned attachment is performed by the engaging portions 21, 21, . . . is pressed radially inward so that the three engaging portions 21 are engaged with the outer ring member 8 of the bearing portion 4 as described above. The inner diameter of the cylindrical portion 30a is set larger than the diameter of the outer member 27b of the cylindrical member 27 of the first cover 28, so that when the second cover 30 is unfitted from the support portion 20b, it can be easily removed. The first cover 28 can be moved in the axial direction along the cylindrical member 27.

Hereinafter, the second cover 30 will be explained with reference to FIGS. 4, 5(a), and 6.
At one location in the circumferential direction of 0a, as shown in FIG. 5(a),
The cross-sectional path “K” is pushed out from the inner circumference to the outside.
The base portion 30 of the bellows-shaped portion 30b is formed in the shape of a
b-1 is provided with an opening (29) L (see lower part of FIG. 4) and a substantially box-shaped bulge 32 forming a groove-shaped recess 31 extending in the axial direction. This bulging portion 32 is provided so that the protrusion 24 can be accommodated in a movable manner in the axial direction, as shown by the imaginary line in the lower part of FIG. It is closed as shown in Figure 5(e). As shown in FIG. 5(a), the cylindrical portion 3 is attached to one side 33 of the circumferentially opposing sides.
It has a circumferential slit 34 extending to 0a.

This slit 34 is provided in the bellows-shaped portion 3 in the abutting portion 26.
When the inner surface of the base 30bl of 0b abuts, the protrusion 24
The slit 34 is provided so that its axial position coincides with that of the circumferential portion 22, and the axial width of the slit 34 approximately coincides with the axial thickness t of the circumferential portion 22. The depth of the cut in the radial direction of the slit 34 is set so that the circumferential portion 22 can pass through the slit 34 with a slight gap maintained. Further, as shown in FIG. 5(a), at each position 120 degrees apart in the circumferential direction from the bulging part 32 of the cylindrical part 30a, there is a The cross-sectional path is formed in a U-shape as if extruded toward the direction, and has an opening at the base 30b-1 of the glossy rose-shaped portion.
5°36), axially extending groove-shaped recess 37.38
A substantially box-shaped bulge 39,40 is provided. These two bulges 39 and 40 are provided corresponding to the projections 2525, respectively, and as shown by imaginary lines in FIG.
It is provided so that the projection 25.25 can be accommodated so as to be movable in the axial direction. Then, the bulging portion 32
Similarly, the bulging portion 40 shown in FIG. 5(b) has an opening 36 on one side in the axial direction, and the opposite side is closed by a wall (the same applies to the bulging portion 39). Then, as shown in FIG. 5(a),
The bulges 39 and 40 have the slits 34 of the bulge 32.
A circumferential slit 43 is provided in the side parts 41 and 42 on the same side as the side part 33 provided with the cylindrical part 30a.
．． 44 are provided. The axial widths of these slits 43 and 44 also substantially match the axial width t1 of the projection 25, and the slits 43 and 44 and the slit 3
4, their axial positions match (see Figure 4)
. The slits 34, 43, 44 extend in the same circumferential direction from each bulge 32°39,40. In addition,
45 is the support part 20b of the first cover 28 and the second cover 30
This is a hole for supplying lubricant to the fitting part with the cylindrical part 30a.

In addition, the bulging portions 32, 39, 40° slits 34, 4
3.44 and the supply hole 45 are designed to have draft angles so that they can be easily removed from the mold when molded.

As shown in phantom lines in FIG. 6, the second cover 30 in FIG. The two bulges 39 and 40 are made to have the same circumferential phase,
Next, in this state, the protrusions 24, 25, 25 are simultaneously housed in the recesses 31, 37, 38 of the respective bulges 32, 39, 40, and the cylindrical portion 30a closes the engaging portion 21, as described above. While pressing 21, . After being externally fitted at a predetermined position in the axial direction, the axial portion 23 contacts the edge 33a of the slit 34 on the inner surface of the side portion 33 in the circumferential direction indicated by arrow A in the figure, and The projection 25.25 is rotated until it abuts the ends 43a, 44a of the slit 43.44, and now
As shown in FIG. 1, the circumferential portion 22 is inserted into the slit 34 in the circumferential direction and protrudes to the outside,
At the same time, the projection 25.25 is inserted circumferentially into the slit 43.44 (the projection 25.25 and the slit 43.44 are not visible in FIG. 1). And this second
The cover 30 is arranged such that the slit 34 and the circumferential portion 22 of the protrusion 24 engage with each other, and the protrusion 25 of the slit 43,44
．． 25, the first cover 28 is locked in the axial direction, and the axial portion 23 and the edge 33a of the slit 34 come into contact with each other, and the protrusion 25.25 and the slit 43.44 By contacting the end portions 43a and 44a, the first cover 28 is secured to the first cover 28 in the direction of arrow A in the circumferential diagram.

The engagement hole 22a provided in the circumferential portion 22 is inserted into the slit 34 in the circumferential direction and the axial portion 23 is in contact with the inner surface (33a) of the side portion 33, as shown in FIG. , it comes to a position almost touching the outer surface of the side portion 33 of the bulging portion 32 . This engagement hole 22a has hooks 50 at both ends with hooks 50 to prevent detachment.
．． One hook 50 of a chain 51 having a length of 50 is locked. By this locking, the circumferential portion 22 of the protrusion 24 is locked so that it does not come off from the slit 34 in the circumferential direction in the direction indicated by the arrow. As a result, the second cover 3
0 and the first cover 28 are integrally locked so that they do not rotate relative to each other in the circumferential direction.

The other hook 50 of the hook 51 is locked to a stationary member on the tractor side or the working machine side (not shown). The outer member 2b of the shaft portion 2 and the cylindrical member 27 of the first cover 28
Since the structure of the tractor side connected to the outer member 27b is similar to that described above, a description thereof will be omitted.

The propeller shaft cover configured as described above is attached and detached as follows.

First, as shown in Figure 1, cross axis 1! The first cover 28 is attached to the shaft portion 2 of the propeller shaft l which is connected to the attachment device 16 through the universal joint B via the ring 20.
Insert from the side and fit outward.

Then, the first cover 28 is pushed in the axial direction indicated by the arrow a in the figure, and the supporting portion 20b is attached to the outer ring member 8 of the bearing portion 4 of the propeller shaft l, and the step portion 20d is attached to the outer ring member 8.
Push it forward until it makes contact with the end face of the Then, the cylindrical member 27 of the first cover 28 is attached to the outer ring member 8 via the ring 20, and is held at a predetermined position in the axial direction with its axis aligned with the propeller shaft l. Covers the shaft portion 2 of 1. Next, the second cover 30 is attached to the bellows-shaped portion 30b on the cylindrical portion 27 of the first cover 28.
As shown in FIG.
．． After aligning the circumferential positions of the bulges 39 and 40 with 25, the second cover 30 is replaced with the first cover 2 while maintaining that state.
8 in the axial direction of arrow a, and the cylindrical portion 30
a to the supporting portion 20b. At this time, the bulging portion 32 is located at the base 30b- of the bellows-shaped portion 30b.
The protrusion 24 has an opening 29 on one side to form a recess 31 in which the protrusion 24 can move in the axial direction, and the protrusion 39.
40 has an opening 35.36 on the side of the base 30b-1, and the protrusion 25.25 forms recesses 37, 38 that are movable in the axial direction, and as described above, the corresponding protrusion 24
and 25.25 and the respective circumferential positions of the bulging portions 32 and 39.40, the second cover 30
The projection 24 is inserted into the recess 31, and the projection 2 is inserted into the recess 31.
5.25 is housed in the recesses 37, 3B, it can be smoothly pushed forward in the axial direction without interfering with the projections 24 and 25.25. Then, along with this pushing, a plurality of engaging parts 21.21. . . . are simultaneously pressed by the cylindrical portion 30a and fall inward in the radial direction, thereby locking the outer ring member 8 in the axial direction. Thereby, the first cover 28 is supported in the axial direction by the bearing portion 4 of the propeller shaft l. The inner circumference of the base portion 30b-1 of the bellows-shaped portion 30b is the contact portion 26, 26. ..., the pushing of the second cover 30 in the axial direction ends. As a result, this second cover 30 is attached to the first cover 2.
It is externally fitted at a predetermined position in the axial direction of the support portion 2Qb of No. 8, and covers the universal joint B centering around the bellows-shaped portion 30b. The axial positions of the axial portion 23 and the slit 34 coincide with each other, and the axial positions of the protrusion 25.25 and the slit 43.44 coincide with each other. Next, the second cover 30 is
With respect to the cover 28, in the circumferential direction shown by arrow A in FIG.
3a, 44a are rotated until they abut against the projections 25.25. Then, the circumferential portion 22 is inserted into the slit 34.
It passes through in the circumferential direction and engages with the slit 34 in the axial direction, and the slit 34 is sealed together with the axial portion 23 . At this time, the engagement hole 22a provided in the circumferential portion 22 is located substantially in contact with the side portion 33 as described above. At the same time, the projections 25.25 are inserted into the slits 43.44 in the circumferential direction, and the slits 43.
．． 44 in the axial direction. Thereby, this second cover 30 has the three engaging parts 21.2 on the first cover 28.
1. ... and is locked in the axial direction through the first cover 28 in the direction opposite to the direction indicated by arrow A in the circumferential direction diagram. Then, the opening 3 of the screening section 39, 40
5.36 moves in the circumferential direction due to the rotation, and is completely closed by the contact portions 26, 26. lastly,
One hook 50 of a chain 51 having hooks 50 and 50 at both ends and the other hook 50 being locked to a stationary member is locked into the engagement hole 22a, and the circumferential portion 22 of the projection 24 is inserted into the slit. 34 in the circumferential direction shown by arrow A in the figure so that it does not come off. As a result, the second cover 30 becomes the first cover 2
8 is integrally fixed. That is, the first and second covers 28 and 30 can be easily attached to the propeller shaft l. At the same time, by locking the one hook 50 to the engagement hole 22a, the first and second cover 28
．． 30 is stopped from rotating and completely covers the propeller shaft 1 and the universal joint B which rotate in a stationary state.

All of the installation procedures described above are reversible, and by performing the above steps in reverse, the above-mentioned No. 1.2 cover 28.3
0 can be easily rotated to release the l-eye, and can also be easily removed from the propeller shaft l.

In this way, this propeller shaft cover can be easily attached and detached without having to perform difficult attachment/detachment operations inside the second cover 30 through the operation hole as in the past, and without using any special tools. Axial sliding and circumferential rotation of the second cover 30 relative to the first cover 28 from the outside, and locking of the hook 50 in the locking hole 22a of the circumferential portion 22 after passing through the slit 34, or locking of the hook 50 with respect to the first cover 28. It can be easily and securely attached to and removed from the propeller shaft 1 just by removing it, and it can also be prevented from rotating at the same time as it is attached, allowing it to expand and contract according to the expansion and contraction of the propeller shirt +-1 when it is stationary. At the same time, the propeller shaft 1 can be reliably covered, and the universal joint B following the propeller shaft 1 can also be reliably covered regardless of its swinging.

Furthermore, when attached to the propeller shaft 1, the slit 34 is completely inserted through the circumferential portion 22 and the circumferential portion 22 and the T-shaped axial portion 23 abut from inside the side portion 33. The opening 35.36 of the recess 37.38, which axially accommodates the projection 25.25, is also closed by the abutment 26, 26 of the first cover 28. Therefore, this propeller shaft cover is
Accidents such as entrainment and infiltration of foreign matter such as sludge into the telescopic portion, bearing portion 4, etc. of the propeller shaft 1 can be reliably prevented. Moreover, according to this propeller shaft cover, the appearance of the cover is improved.

Furthermore, this propeller shaft cover does not require coil springs, slide rings, etc. unlike conventional propeller shaft covers, so the number of parts can be reduced compared to conventional ones. Also,
When the propeller shaft cover is removed from the propeller shaft L, the raceway surface is exposed and foreign matter does not adhere to the raceway surface while the cover is removed, unlike in the conventional case, so it always remains smooth. Rotation can be ensured and the life of the bearing section 4 can be maintained.

In the above embodiment, one protrusion 24 and two protrusions 2 are provided on the support portion 20b of the first cover 28 at appropriate intervals in the circumferential direction.
5.25 and the cylindrical part 30 of the second cover 30
In a, a bulge 32 having a slit 34 and a slit 43 correspond to the projection 24 and the projection 25.25.
．． 44 are provided so that the first cover 28 and the second cover 30 engage each other axially and circumferentially as described above, but the support part 20b
The total number and combination of the protrusions 24 and 25 provided on the cylindrical portion 30a, and the total number and combination of the protrusions 32 and 39 or 40 provided on the cylindrical portion 30a corresponding to the protrusions 24 and 25. are these three and l
:2, but for example, when the total number is three as described above, this combination may be 3:0. That is, the first cover is provided with three protrusions that are the same as the above-mentioned protrusions 24 at appropriate intervals in the circumferential direction, and the second cover is provided with three protrusions that are the same as the above-mentioned bulges 32 so as to correspond to the three protrusions. Alternatively, the first cover 28 and the second cover 30 may be engaged with each other in the axial direction and the circumferential direction in the same manner as described above. However, at least one protrusion 25 and one bulge 32 are provided on the support portion 20b and the cylindrical portion 30a.

In the above case, the hook 50 has three protrusions 25.25°...
- is engaged with the engagement hole 22a of any one of the protrusions 25 convenient for locking.

Further, in the above embodiment, the support portion 20b of the first cover 28
A circumferential portion 22 of a protrusion 24, which is provided in the second cover 30 and is provided in the second cover 30, is provided so as to be directly connected to the support portion 20b, and includes a circumferential portion 22 having an axial portion 23 and a circumferential portion 22 having an engagement hole 22a. , a slit 34 is provided in the side portion 33 of the bulged portion 32 forming the recess 3I in which the protrusion 25 is movable in the axial direction, and extends to the cylindrical portion 30a connected thereto, and allows the circumferential portion 22 to be inserted in the circumferential direction. , the circumferential portion 22
is inserted into the slit 34 in the circumferential direction, and the slit is inserted in the axial direction at roughly two locations: the slit portion on the side portion 33 and the circumferential portion 22, and the slit portion and the circumferential portion 22 on the side of the support portion 20b. Although the projections and slits are engaged with each other, the projections and the slits may be provided so that the engagement in the axial direction is performed at at least one of the two locations. That is, for example, as shown in FIG. 7, which shows only the main parts that are different from the above embodiment, an axial portion 123 protruding from the support portion 20b of the first cover 28 is provided in a cantilever shape at an appropriate distance from the support portion 20b. A second cover 30 protrudes from a distance of M, extends in the circumferential direction, and has its radially inner surface 122a fitted onto the support portion 20b.
A projection 124 having a circumferential direction ff1122 that is approximately equal to or radially outer than the outer periphery of the cylindrical portion 30a is provided, and a recess that is provided in the cylindrical portion 30a and allows the projection 124 to move in the axial direction. A slit 134 that opens only to the side part 133 and does not extend to the support part 20b is provided in the side part 133 of the bulging part 132 forming the tat, and the circumferential part 122 is inserted through the slit 134 in the circumferential direction. , may be engaged in the axial direction. The circumferential portion 122 is also provided with an engagement hole 122a. In both cases, the action of the axial portion is the same.

Further, in the above embodiment, the first cover 28 and the second cover 30 are engaged with each other in the axial direction and the circumferential direction by rotating in a constant direction in the circumferential direction, but the second cover is connected to the first cover. It is also possible to enable the first cover and the second cover to be engaged in the axial direction and the circumferential direction even when the first cover and the second cover are rotated in any direction in the circumferential direction. At this time, the circumferential portions are provided on both circumferential sides of the axial portion, and slits through which the circumferential portions can be inserted are provided on both circumferentially opposing sides of the bulging portion.

In addition, in FIGS. 8(a), (b), and (c), the mounting on the opposite side of the cylindrical member 27 represents the ring 20°, and the mounting is on the fitting portion 20°a of the ring 20°. Because it is fitted onto the outer member 27b of the cylindrical member 27, its outer diameter is large and has the same diameter as the support portion 20'b. Therefore, 20°d is provided in place of the stepped portion 20d at the joint portion between the fitting portion 20°a and the support portion 20°b. The projection 20'a-1 that engages with the outer member 27b is also attached because the ring 20' is fitted onto the outer member 27b.
It is provided on the inner peripheral side of the fitting portion 20a.

Further, the engaging portion 21' is as shown in FIG. 8(b) and (c) (FIG. 8(b) and (c) are respectively shown in FIG.
It has a shape (view from the direction indicated by middle arrows ■b and ■C).

<Effects of the Invention> As is clear from the above, the propeller shaft cover of the present invention can be easily and reliably attached to and detached from the propeller shaft with one touch without using any special tools, and can be attached to and removed from the propeller shaft at the same time as the rotation. can be stopped.

Further, in the propeller shaft cover of the present invention, the slit can be closed by inserting the circumferential protrusion or by abutting the edge of the slit from the inside of the side of the bulge of the circumferential protrusion. It is possible to prevent foreign matter from entering the shaft.

Further, since the propeller shaft cover of the present invention does not require a coil spring unlike the conventional case, the number of parts can be reduced compared to the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a propeller shaft cover according to an embodiment of the present invention attached to a propeller shaft, and FIG.
Figure (a) is a cross-sectional view of the installation shown in Figure 1 taken along the axis of the ring, and Figures 2 (b) and 2 (c) are respectively shown in Figure 2 (a).
A view of the main parts of the main part viewed from the direction indicated by arrow nb and arrow 11c in the figure (Fig. 3(a) is a side view of Fig. 2(a) seen from the axial fitting part side, Fig. 3(b) is a view of the main part of FIG. 3(a) viewed from the direction indicated by arrow l11b in the figure, and FIG.
Figure 5 (a) is a sectional view taken along the line Va-Va in Figure 4, Figure 5 (b) is a view of the second cover in the figure as seen from the direction perpendicular to the axis
, (c) is a view of the main part of FIG. 5(a) seen from the arrow vb and arrow Vc force directions in the figure, and FIG. 6 is a cross section of the first cover and second cover in FIG. 1 taken along the line Vl-Vl. Diagram (1st cover and 2nd cover)
7 is a sectional view perpendicular to the axis of the main part of the modified example, and FIG. Cross-sectional view along Figure 8 (b
) and (c) respectively indicate the main parts of Figure 8 (a) with the arrows ■
FIG. 9 is a longitudinal cross-sectional view of a conventional propeller shaft cover attached to a propeller shaft. ! ... Propeller shaft, 20.20'... Mounting is ring, 21... Engagement part, 22.122... Circumferential part, 22a, l 22
a-Engagement hole, 23.123...Axial portion, 24, 12
4...Protrusion, 28...First cover 30...Second cover 31.131...Concavity, 32,132.
...Bulging part 33.133...Side part, 33 a-=
Edge, 34.134...Slit, A...Joint part. Patent applicant Koyo Seiko Co., Ltd. Agent Patent attorney Aoyama Ao and one other person Figure 3 (0
) Figure 3 (b) Figure 2 (0) b Figure 8 (0) V anus b

Claims (1)

[Claims] (1) It is formed into a cylindrical shape so as to cover the propeller shaft, and its end portion is supported by the joint portion of the propeller shaft, and moves radially to the end portion to engage with the joint portion of the propeller shaft. a first cover having an engaging portion that can be fitted together; and a first cover that is fitted onto the first cover so as to be movable in the axial direction, and presses the engaging portion to engage the engaging portion and the joint portion with each other. , a propeller shaft cover comprising a second cover covering the joint portion, wherein an end of the first cover is provided with a circumferential protrusion extending in the circumferential direction and having an engagement hole; The cover for a propeller shaft is provided with a slit on a side portion through which the circumferential protrusion is inserted in the circumferential direction, and a bulge portion forming a recess through which the protrusion can move in the axial direction.