JPH043126Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lubricating device for a linear motion rolling bearing, and specifically relates to an improvement of side plates attached to both ends of a casing in the direction of motion.

BACKGROUND ART In a linear motion rolling bearing, side plates are attached to both ends of the casing in the direction of motion, and a direction changing path is formed on the inner surface to smoothly move rolling elements such as balls and rollers from the raceway to the return path. It plays a part in the endless circulation route. Since the direction change path formed in the side plate has a complicated shape, it is generally formed by injection molding using a plastic material. The side plates are also used to lubricate the bearings. The conventional method is shown in FIG. This is a view of the side plate 3' viewed from the inside. When lubricant is injected from a grease nipple attached to the center of the outer surface of the side plate, it enters the side plate through the grease nipple hole 3'a. At both inner ends of the grease nipple hole 3'a, there is an oil groove 3'c connecting the direction change path 3'b and the grease nipple hole.
are formed continuously, and the lubricant is inserted into the direction change path through this oil groove.

Problems that the invention aims to solve: This method has the advantage of providing a good lubrication effect because the lubricant is directly inserted into the direction change path, but because the oil pocket volume is small, the lubricant deteriorates rapidly. The drawback was that the replenishment interval was shortened.

Means and Effects for Solving the Problems The present invention aims to eliminate these drawbacks, maximize the following lubrication effects, and provide a long-life linear motion bearing. i.e. reduction of friction and wear, removal of frictional heat, formation of an oil film on the rolling surface, thus extending life, preventing rust,
and dust prevention.

The present invention includes a lubricating device having the following configuration as a means for achieving the above object.

In a rolling bearing for infinite linear motion in which the casing straddles a track rail with raceway grooves formed on both shoulders via rolling elements on the raceway surface, the side plates attached to both ends of the casing in the direction of motion have raceway grooves. A direction change path is formed that connects the direction change path and the return path, and a space for thinning is formed in areas other than necessary parts such as the direction change path and the mounting hole to the casing. , a straight line that serves as an oil pocket for the bearing, and is formed such that the outlet of the lubricant formed in the space is located below the inlet when the bearing is placed in the normal position. Rolling bearing for motion.

Embodiment Figures 1 to 5 show an example of the implementation of the present invention, in which the side plate 3 is formed by injection molding using plastic material, and the thickness of each part is made uniform to prevent deformation after molding. In order to reduce the size, a lightening space 3d is provided in the upper part and other parts. Note that 3a is a hole for a grease nipple, and 3b is a direction change path covered by a spacer 9. A hollow metal pin is integrally formed in the attachment hole 3c to the casing to prevent deformation caused by the bolt and ensure fixation. Locating pins 3 protruding from both ends of the lower side plate
f is engaged with a hole formed at a corresponding position in the casing to facilitate connection between the direction change path and each ball path. Grease, which is periodically pumped up from the grease nipple hole 3a located at the center of the upper part of the side plate, collides with the casing and then temporarily enters the large-capacity oil pocket formed by the space 3d through a plurality of oil grooves 3c. It can be accumulated. When the pressure of the grease accumulated in the oil pocket increases, it flows out into the direction change path 3b through the passage 3c leading to the direction change path. Furthermore, the outlet side of the passage 3c from the space 3d is usually formed lower than the inlet side, so that during bearing movement, the oil in the oil pocket gradually drops due to its own weight and clay deterioration due to high temperature. It flows out into the turning path and exerts a long-term lubrication effect.

In the above embodiment, a grease outflow path to the track rail 1 is also included, but a path may be provided from this oil pocket to another oil pocket, and the path to the track rail may be blocked.

Various positions of the oil pocket, grease nipple hole, and oil groove can be considered in addition to the above-mentioned embodiments, as long as they are suitable for the structure of the present invention.

Effects of the invention (1) This type of bearing has fewer oil pockets in the endless circulation path, so the lubricant filling period has been lengthened instead of being short.

(2) Significant lubrication effect reduces friction and wear, extending life.

[Brief explanation of the drawing]

Figure 1 shows an example of the implementation of the present invention, and is a rear view of the side plate, Figure 2 is a front view of the spacer, and Figure 3 is a front view of the spacer.
4 is a partially cutaway perspective view of the bearing, FIG. 5 is a partially cutaway front view of the bearing, and FIG. 6 is a rear view of a side plate showing a conventional example. . The symbols in the drawings indicate the following members, respectively. 1...
Truck rail, 2...Casing, 3,3'...
...Side plate, 4...Ball, 5...Cage, 6...Side seal, 7...Bottom seal, 8...Grease nipple, 9...Spacer.

Claims (1)

[Scope of utility model registration request] In a rolling bearing for infinite linear motion in which the casing straddles a track rail with raceway grooves formed on both shoulders via rolling elements on the raceway surface, the inner surface of the side plate attached to both ends of the casing in the direction of motion is A direction change path connecting the raceway groove and a return path drilled in the casing is formed symmetrically across the track rail, and a grease nipple hole is formed in the upper center of the side plate for guiding lubricant from the grease nipple to the end surface of the casing. has been
Inside the side plate, except for necessary parts such as the direction change path and the grease nipple hole, a space is formed by cutting out the space symmetrically around the grease nipple hole. An oil groove was formed in the wall for connecting the adjacent spaces on both sides so that the inlet of the lubricant was higher than the outlet, allowing the lubricant to communicate from the grease nipple to the direction change path. Lubricating device for linear motion rolling bearings.