JPS6235945Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a side plate fixed to the casing body of an infinite linear motion ball bearing unit, and when assembling the casing, a direction change path formed in the side plate and a hole bored in the casing body are formed. It is an object of the present invention to provide a side plate that allows easy and accurate positioning of the connecting end with a return hole provided and that can reduce sliding resistance as an infinite linear motion ball bearing unit.

The infinite linear motion ball bearing unit of this invention is the first
As shown in FIG. 2, a casing 3 that straddles a linear track rail 1 is a bearing unit that can perform infinite linear motion via balls 2, and the casing 3 is connected to a casing body 4. ,
It is constituted by side plates 5 attached to both ends of the casing body 4 in the direction of movement.

In the conventional casing, as shown in FIG. 10, in order to attach the side plate 30 to the casing body 31 in the correct position, for example, positioning shorts are provided on the side plate 30 and the casing body 31 at the screwing positions of the fixing bolts 32. The tube 33 is fitted, and the short tube 33
There was one in which a fixing bolt 32 was inserted into the structure. The mounting position of the fixing bolt 32 on the side plate 30 is as shown in FIG.
7, and is provided at the upper center and lower left and right sides of the side plate 5, and among the endless circulation paths through which the ball 2 circulates endlessly, the return hole 8 bored in the casing body 4 and the direction provided in the side plate 5. Turning road 9
The positioning portions of both opening ends of the side plate 5 are provided near the upper portions of both left and right ends of the side plate 5, and the mounting position of the fixing bolt is located away from the positioning portion of the endless circulation path. In the mounting structure of the fixing bolt 32 provided with the very short pipe 33 shown in FIG. This is only an indirect correction, and the opening ends of the return hole and the direction change path do not perfectly match, resulting in a slight discrepancy.
It is not possible to ensure smooth rolling of the ball group between the return hole and the direction change path, which is one of the major causes of running sliding resistance as an infinite linear motion ball bearing unit.

In addition, positioning pins are also used to determine the attachment position of the side plate to the casing body, but in this case as well, the same problem as mentioned above occurs in that the return hole and the direction change path are not perfectly aligned. It was hot.

As mentioned above, the present invention ensures that the opening ends of the return hole and the direction change path coincide, which is one of the major causes of increased sliding resistance in infinite linear motion ball bearings. The purpose is to provide a linear motion ball bearing.

In the present invention, ball raceway grooves are formed in the longitudinal direction on both shoulders of the track rail. In an infinite linear motion ball bearing unit in which an endless circulation path is formed in which the balls circulate infinitely, the casing includes a casing body and a side plate attached to both ends of the casing body in the direction of movement, and the casing body of the side plate The endless circulation path is located between the opposite opening ends of the direction change path formed in the side plate and the return hole drilled in the casing body, of the endless circulation path. By fitting a short connecting straight pipe that also serves as a knock pin for positioning the side plate that forms a part of the path, the above-mentioned return hole and the direction change path can be perfectly aligned. We were able to provide an infinite linear motion ball bearing unit with low running sliding resistance, and regarding its configuration,
This will be explained below with reference to the drawings.

As shown in Figs. 1 to 3, the infinite linear motion ball bearing unit of the present invention has a track rail 1.
Ball raceway grooves 10 are formed in the longitudinal direction on both shoulders of the track rail 1, and the ball raceway grooves 10 are connected to linear track grooves 11 formed on both shoulders of the track rail 1, and 1 and a linear casing groove 12 formed on the inner surface of the casing 3 that spans over the casing 1, thereby forming a load area.

The casing 3 is mounted on the track rail 1 so as to be freely movable via a large number of balls 2 rolling in the ball raceway grooves 10. The ball 2 is connected to the ball raceway groove 10 and the casing body 4.
The ball endlessly circulates in an endless circulation path formed by a return hole 8 bored therein and a direction changing path 9 connecting both ends of the ball raceway groove 10 and the return hole 8, respectively.

The casing 3 is composed of a casing body 4 and side plates 5 attached to both ends of the casing body 4 in the direction of movement. The cover 13 is attached with the fixing bolts 6,
It is screwed on.

On the contact surface of the side plate 5 with the casing body 4, a direction changing path 9 formed in the side plate 5 and a return hole 8 bored in the casing body 4 of the endless circulation path are opposed to each other. A short connecting straight pipe 14 that forms a part of the endless circulation path and through which the ball 2 can smoothly roll is fitted between the two open ends of the side plate 5. It also serves as a knock pin for positioning the casing body 4.

As shown in FIGS. 5 and 6, the connecting straight pipe 1
4 has the same inner diameter as the inner diameter of the return hole 8 and is fitted completely on the same axis as the return hole 8, and the connecting straight pipe 14 is connected to the direction change path 9 of the side plate 5. In particular, when the side plate 5 is a plastic molded body, the guide plate 15 is buried so as to form the outermost portion of the inner circumferential surface of the direction change path 9 that is in rolling and sliding contact with the ball 2 and receives the most rolling load. and the inner cylindrical surface 1 of the connecting straight pipe 14.
6 is fitted to the side plate 5 so as to match.

In the embodiments shown in FIGS. 4 and 6 to 8, a spacer 17 is fitted into the side plate 5 to form an inner half surface on the inner peripheral surface of the direction change path 9. In this case, a fitting groove 18 is formed on the side plate 5 side, which forms the outer half of the inner peripheral surface of the direction change path 9 and into which the spacer 17 is fitted. Also, the first
The thin wire-shaped holder 19 shown in FIGS. 3 to 5 is provided to prevent the two groups of balls on the ball raceway groove 10 from falling when the casing 3 is removed from the track rail 1. It is something.

In the embodiment of the infinite linear motion ball bearing unit described above, the width of the track rail 1 is not very large, and the left and right direction changing paths 9 are provided in the same side plate 5.

In another embodiment shown in FIG. 9, the width of the track rail 20 is extremely large, and the width of the casing 21 is also large, so that the left and right return holes 2
Since the interval between the two is also large, the side plates 23 on which the direction change path (not particularly shown) are provided are separated to the left and right of the casing body 25 and are separate bodies.

In this embodiment as well, the direction change path and the return hole 2
A short connecting straight pipe 24 forming a part of the endless circulation path is fitted between the opening ends facing each other, and also serves as a knock pin for positioning the side plate attachment. Also in this embodiment, the direction change path may be formed by fitting a spacer.

In addition, as shown in FIG. 1, the return holes 8 are provided at symmetrical positions in the casing 3,
The casing grooves 12 are also provided at symmetrical positions. Therefore, there is a turning road 9 that connects the two.
However, as shown in FIGS. 1, 3 to 5, if it is formed of a part of the spiral surface of the same shape that forms an arc in both the elevation view and the plan view, then the front, rear, left, and right sides of the casing 3 It is fitted in place. Spacer 1 mentioned above
7 can share the same shape, and of course, the four connecting straight pipes 14 can also have the same shape, depending on the number of parts of the infinite linear motion ball bearing unit. reduction, which helps reduce production costs.

Next, the effects of the present invention will be explained.

The present invention has the configuration described in the claims of the utility model registration, and includes return surfaces formed facing each other on the abutting mounting surfaces of the casing body and side plate that constitute the casing of an infinite linear motion ball bearing unit. A short connecting straight pipe is fitted between the open end of the hole and the open end of the direction change path to ensure that the two open ends coincide and form part of the endless circulation path. When installing the side plate, the return hole and the direction change path can be completely integrated on the same axis, and the return hole and direction change path form the no-load area of the endless circulation path. It is possible to reduce the circulation resistance of the balls, and it can also be applied to direction change paths formed by three-dimensional helical surfaces.It is also possible to reduce the running and sliding resistance of infinite linear motion ball bearing units, and at the same time, it is possible to reduce the running and sliding resistance of the infinite linear motion ball bearing unit. When attaching to the casing body, by using the connecting straight pipe directly as a knock pin on the mounting guide, it can be given the role of positioning the side plate attachment, and it is sufficient to simply tighten the fixing bolts, and the side plate of the casing body Installation can be done extremely easily, accurately, and quickly, and various effects have been achieved, including a reduction in assembly costs, a reduction in the number of types of component parts, and a reduction in manufacturing costs.

[Brief explanation of the drawing]

Figure 1 is an elevational view of the embodiment showing a cross section of the casing and track rail with the side plate removed on the right half;
Figure 2 is a side view of the same as above, Figure 3 is a longitudinal sectional view of the center of the casing, Figure 4 is an elevation view of the side plate showing the right half as the outer surface and the left half as the inner surface, and Figure 5 shows the connecting straight pipes. A perspective view showing the relationship between the guide plate and the ball rolling in the direction change path, FIG. 6 is a partial sectional view taken along the line - in FIG. 1, FIG. 7 is a side view of the spacer, and FIG. 8 is a diagram in FIG. 7. 9 is an elevational view showing a section of the casing and track rail with the side plate removed on the right half of another embodiment; FIG. 10 is a partial sectional view of a conventional example; FIG. 1,20...Truck rail, 2...Ball,
3, 21... Casing, 4, 25... Casing body, 5, 23... Side plate, 8, 22... Return hole, 9... Direction change path, 10... Ball raceway groove, 14, 24... Connection Straight pipe.

Claims (1)

[Scope of utility model registration request] Ball raceway grooves are formed in the longitudinal direction on both shoulders of the track rail, and a casing is placed so as to run freely through a large number of balls rolling in the ball raceway grooves, and the balls are placed inside the casing. In an infinite linear motion ball bearing unit in which an endless circulation path is formed, the casing is composed of a casing body and side plates attached to both ends of the casing body in the direction of movement, and the side plates are in contact with the casing body. On the surface, the endless circulation path is arranged between both open ends of the endless circulation path that abut and face each other, where a direction change path formed in the side plate and a return hole bored in the casing body are in contact with each other. 1. A side plate of an infinite linear motion ball bearing unit, characterized in that a short connecting straight pipe is fitted therein and also serves as a knock pin for positioning the side plate to ensure that both open ends of the side plate form a part of the side plate.