JPS6133322Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a speed reducer that closes an opening provided at the end of an intermediate shaft of a gear box of the speed reducer, for example.

In the conventional speed reducer of this kind, the opening is closed by connecting the cover with a plurality of bolts that are screwed into a plurality of female screws formed around the periphery of the opening of the gear box. Therefore, when attaching or detaching the cover, it is necessary to use a tool such as a spanner to tighten or loosen a plurality of bolts by rotating them in predetermined directions. In particular, when there are a large number of bolts, the installation and removal of the cover requires a considerable amount of time and is tiring for the operator.

This invention was made in an attempt to eliminate such drawbacks, and one embodiment of this invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is an electric motor serving as a driving source, and a first gear is coupled to a rotor shaft. (none shown), 2
3 is a gear box that surrounds and supports the speed reduction mechanism of the speed reducer 2, 3a is a through hole provided in the casing 3, and 4 is a third gear. A second gear (not shown) meshing with the first gear is fitted, and one end is rotatably supported by the housing 3 via a ball bearing 5. 6 is a housing, and the above-mentioned through hole 3a
It is connected to the outer edge of the rim with a plurality of countersunk screws (not shown). Reference numeral 7 designates four engaging members consisting of four machine screws screwed onto the same circumference of the housing 6 at equal pitches and protruding from the outer end surface of the housing 6 to the same length. The screw shaft portion 7a has a screw shaft portion 7a attached thereto, and a head portion 7b formed at the tip of the screw shaft portion 7a.

Reference numeral 8 denotes a cover main body made of a thin steel plate or the like, and is formed by a circular flat base 8a and a cylindrical portion 8b formed continuously with the base 8a. The base 8a has a large diameter through hole 8c having the same circular diameter and the same pitch as the four small screws 7, and has a slightly larger diameter than the head 7b, and a screw connected to the large diameter through hole 8c. Small diameter through hole 8d smaller in diameter than the shaft portion 7a
Four through holes 8e are provided. Reference numeral 9 denotes an elastic body having a large coefficient of friction, such as an annular sponge, which is connected to the lower end surface of the base 8a, and is provided with four through holes 9a of the same shape that communicate with the four through holes 8e. There is. In addition,
The four engaging members 7 pass through the elastic body 9 and the four small diameter through holes 8d of the cover body 8, and the lower end surface of the head of the engaging member 7 and the base of the cover body 8. 8a and the upper end surface are engaged with each other. Reference numeral 10 denotes an output shaft that is rotatably supported by the housing 3 via a bearing (not shown), and a fourth gear (not shown) that meshes with the third gear 4 is fitted therein.

The operation of a device configured in this way is well known and will not be explained here, but the cover body 8,
Attachment and removal of the elastic body 9 will be explained. In case of installation, first attach the heads 7 of the four engaging members 7.
When the four large-diameter through-holes 8c are fitted into the four large-diameter through-holes 8c and the cover main body 8 is pressed and rotated toward the large-diameter through-holes 8c, the screw shaft portion 7a of the engaging member 7 is fitted into the small-diameter through-holes 8a. At the same time, the lower end surface of the head 7b of the engaging member 7 engages with the upper end surface of the base 8a of the cover body 8. In this case, since the elastic body 9 is coupled to the base 8a, the elastic force of the elastic body 9 causes the upper end surface of the base 8a to
The elastic body 9 and the housing 6 are connected by pressure and friction to the lower end surface of the head 7b. When removing the cover body 8 and the elastic body 9, press the cover body 8 and rotate it toward the small diameter through hole 8d, so that the head 7b of the engaging member 7 is loosely fitted into the large diameter through hole 8c. In this state, the cover body 8 and the elastic body 9 can be removed from the engagement member 9.

In this embodiment, the cover body 8 is formed of a circular flat plate-shaped base 8a and a cylindrical part 8b, but the cover body 8 is not limited to this embodiment. A through hole 8e having the same shape as that of the above embodiment may be provided in the formed one. Further, in this embodiment, a cover body 8 having four through holes 8e, an elastic body 9, and four engaging members 7 has been described, but for example, a cover having two through holes 8b may be used. The main body 8 may include an elastic body 9 and two engaging members 7. Furthermore, in this embodiment, the engaging member 7
Although described as a machine screw, the present invention is not limited to this embodiment, and any screw may be used as long as it has an engaging portion with the cover body 8.

This invention is constructed as described above, and includes a gear box having an opening from which an intermediate shaft end projects, a shaft portion protruding around the opening and coupled to the gear box;
a plurality of engaging members having a head formed at the tip of the shaft, a small diameter through hole through which the shaft passes through and which can engage the head at the periphery; A flat plate base having a large-diameter through hole through which the head passes through is formed to correspond to the plurality of engaging members, and a cylindrical portion continuous with the base and having one end closed. a cover body that seals the opening; a through hole that is connected to the base of the cover body and has the same shape as the plurality of through holes that seals between the cover body and the gear box; Since an elastic body is provided that can hold the head and the cover body in an engaged state with elastic force, by rotating the cover body, the cover body is coupled to the periphery of the opening of the casing via the elastic body. Since the cover can be removed from the housing, tools such as spanners are completely unnecessary for attaching and removing the cover, which has the effect of significantly shortening the work time for attaching and removing the cover.

In addition, since the cover body is supported by the engagement member by the elastic force of the elastic body, the elastic body absorbs the vibration of the reduction gear, and it is possible to reliably prevent the cover body and the engagement member from loosening. It has the effect of reliably sealing the space between the cover body and the gear box, and
The cover body can be rotated by grasping the large diameter cylindrical part.
This has the effect of making the rotation operation easier.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing an embodiment of this invention, Fig. 2 is an enlarged view of the main part of this invention, Fig. A is a sectional view, and Fig. B is a top view of Fig. A. In the figure, 1 is an electric motor, 2 is a reduction gear, 3 is a housing,
3a is a through hole, 4 is a third gear, 5 is a ball bearing, 6 is a housing, 7 is an engaging member, 7a is a screw shaft portion, 7
b is the head, 8 is the cover body, 8a is the base, 8b is the cylindrical part, 8c is the large diameter through hole, 8d is the small diameter through hole,
8e is a through hole, 9 is an elastic body, and 10 is an output shaft. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A gear box having an opening from which an intermediate shaft end projects, a shaft portion protruding around the opening and coupled to the gear box, and a plurality of heads formed at the tip of the shaft portion. an engaging member, a through-hole having a small-diameter through-hole through which the shaft passes through and which can engage the head at the periphery, and a large-diameter through-hole through which the head passes in succession to the small-diameter through-hole; A cover body having a flat base with holes formed corresponding to the plurality of engaging members, and a cylindrical part continuous with the base and having one end closed, and sealing the opening; It is coupled to the base of the cover main body, has a through hole having the same shape as the plurality of through holes, and engages the head and the cover main body with an elastic force when sealing between the cover main body and the gear box. A deceleration device equipped with an elastic body that can be held in a fixed state.