JPS602016Y2 - Cover device for protruding shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover device for a protruding shaft provided to surround a protruding shaft such as a PTO shaft of an agricultural tractor or an input shaft of a working machine.

In agricultural tractors, etc., a circle 0 axis protrudes from the rear of the transmission case in order to drive the work equipment via a universal joint, and safety measures are taken to prevent workers from touching this circle 0 axis and getting injured. A cover is provided.

Since the joint must be connected to the PTO shaft when the work machine is used, conventional safety covers form a net-like part on the earthen wall so that the joint can be visually observed.

However, the net-like part of this conventional cover makes it difficult to see around the gate axis, making it difficult to connect the joints.

In view of the above-mentioned problems with conventional devices, the present invention forms an opening in the mud wall of the cover that can be opened and closed by a rotatable lid member, making it extremely easy to attach and detach the joint while visually checking the shaft. It is an object of the present invention to provide a cover device for a protruding shaft configured as described above.

In this invention, a cover is attached to the gear case so as to surround at least the upper part and both sides of the shaft protruding from the gear case, an opening is formed in the earthen wall of this cover, and a lid member that opens and closes this opening is rotatable. A cover device provided with a means for fixing the lid member in a closed position,
The opening has a hole shape, and the lid member is supported by the cover so as to be rotatable in the horizontal direction via a vertical axis.

Although a cover device for protecting the zero axis will be described below, the present invention can also be applied as a cover device for the input shaft of a working machine, for example.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, an agricultural tractor body 1 has a PT at its rear.
An O-shaft 2 protrudes, and a universal joint 6 connects the input shaft 5 of a rotary working machine 4 mounted on the tractor body 1 via a three-point link mechanism 3 to the PTO shaft 2. The joint 6 is provided with a male sliding shaft 8 and a female sliding tube 9 in the middle of its length, and has universal joints 10.10 formed at both ends, as in the prior art.

11 is a joint cover, bearing 12 is attached to joint 6,
12 so as to be relatively rotatable, and surround substantially the entire length of the joint 6.

The joint cover 11 has a front cover 14 and a rear cover 15 (sometimes having an intermediate cover) which overlap each other.

), it expands and contracts in response to the expansion and contraction of the female sliding part of the joint 6.

The double force bars 14.15 each have a cylindrical member 14a, 15a and an enlarged bellows member 14b, 15b, and each cover 14.15
A band 16.1 is attached to the connecting part between the cylinder member and the enlarged bellows member.
7 is provided and by means of this band 16.17 the bearing 12
, 12.

A short chain 20 is connected to the band 16, and one end of a tension spring 21 is connected to this chain 20.

The spring 21 as an elastic tension member has both ends formed into a hook shape, and the other end is connected to the support mast 2.
2, and elastically pulls the band 16 toward the working machine 4 side.

A long chain 25 is connected between the band 17 and the support mast 22, and is slightly loosened to prevent the joint cover 1 from twisting when the spring 21 is overstretched.

31 is a cover device for the PTO shaft 2, as shown in FIG.
The cover includes a main body 32, a lid member 33, and a fixing means 34.

The cover main body 32 includes an upper wall 32a, left and right side walls 32b, and a back wall 3.
2c, has a U-shaped cross section, and has a back wall 3
2c is fixed to the transmission case (gear case) of the tractor body 1 via bolts 35.

The upper wall 32a of the cover main body 32 is formed with a hole-shaped opening 36 that is large enough to allow the p'ro axis 2 to be viewed visually, and the lid member 33 has one corner to open and close this opening 36. It is horizontally rotatable via a vertical shaft 37.

The lid member 33 is a rectangular plate member, and when it rotates, it slides on the upper surface of the upper wall 32a and engages with the side fixing member 39 at a position where the opening 36 is closed.

The side fixing member 39 is screwed to the upper surface of the upper wall 32a, and has a groove 39a that engages with the lid member 33. By engaging one side of the lid member 33 with this groove 39a,
Rotation in the closing direction is prevented.

The fixing means 34 consist of the side fixing members 39 and a stopper 40 provided on the lid member 33.

This stopper 40 has a hook 40a that can be locked to the edge of the upper wall 32a, and a lever 40b that is pivotally supported on the lid member 33.
The lid member 33 is pressed against the upper wall 32a through the opening 0a, thereby preventing the lid member 33 from rotating in the opening direction.

To attach and detach the yoke 13 of the joint 6 and the circular axis 2, remove the stopper 40 and rotate the lid member 33 approximately 90 degrees in the opening direction (arrow direction A in FIG. 2) to open the opening 36. This is done by grasping the yoke 13 while visually observing the PTO shaft 2 and its surroundings through the opening 36 (indicated by the imaginary line in FIG. 2).

A top ring bracket is disposed above the HD shaft 2 via a fixed mounting base on the upper rear surface of the body 1, and this top ring racket is located near the top of the cover device 31, The rings are connected.

Further, above the input shaft 5, a support mast 22 fixed to the working machine 4 and a chain 2 for the joint cover 11 are provided.
5 are arranged so as to overlap each other.

FIG. 3 shows a modification of the stopper of the fixing means, in which the stopper 42 is a single bolt screwed into the side fixing member 39.

In this case, the side fixing member 39 is formed slightly longer than one side edge of the lid member 33, and the outer end 3 of the side fixing member 39 is
9b protrudes from the lid member 33 in the closed position toward the working machine 4 side, and a stopper 42 is screwed into this outer end portion 39b. When the stopper 42 is screwed in, it protrudes into the groove 39a and closes the cover member. 33 to prevent the lid member 33 from rotating in the opening direction.

According to the present invention described in detail above, the opening formed in the upper wall of the cover is in the shape of a hole, and the lid member that opens and closes the opening is configured to be rotated in the horizontal direction, so that the cover is attached to the earthen wall. Compared to an opening without a hole or a notch-shaped opening, it has a part connecting the left and right side walls at the front and rear of the earthen wall, which makes it possible to minimize the strength loss caused by forming an opening, and improves the maintenance of the cover. The shape strength is maintained.

Also, compared to the case where the cover member is rotated to open and close about the front and back axis, it is better to rotate the cover horizontally about the vertical axis to lower the support link, chain, top link bracket, and its mounting base, etc. to the upper part of the cover. Can be installed with
In addition, when the cover is fully opened, it does not become an obstacle when looking inside the cover from the side, and the protruding shaft can be easily and reliably viewed visually.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the cover device of the present invention, FIG. 1 is a partially sectional explanatory view of an agricultural tractor equipped with the device, FIG. 2 is a perspective view of the device, and FIG. The figure is a plan view of the device with a modified fastener. DESCRIPTION OF SYMBOLS 1... Tractor body, 2... PTO axis, 4... Rotary work machine, 6... Universal joint, 11
... joint cover, 31 ... cover device, 32
... Cover body, 32a... Earth wall, 32b... Side wall, 33... Lid member, 34... Fixing means, 36...
- Opening, 39... Side fixing member, 39a... Groove,
40...Stopping metal fittings.

Claims (1)

[Scope of utility model registration request] A cover is attached to the gear case so as to surround at least the upper part and both sides of the shaft protruding from the gear case, an opening is formed in the earthen wall of this cover, and a lid member is rotatably provided to open and close this opening. A cover device provided with means for fixing a lid member in a closed position, wherein the opening has a hole shape, and the lid member is supported by the cover so as to be rotatable in a horizontal direction via a vertical axis. A cover device for the protruding shaft.