JP2540227Y2 - Linear drive rolling bearing - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear drive rolling bearing with a needle roller race.

2. Description of the Related Art FIG. 3 is a view for explaining a conventional linear drive rolling bearing. In the drawing, reference numerals 1 and 2 denote a base and a slider on which needle roller race mounting grooves 1a and 2a having a U-shaped cross section are formed, respectively, and 3 denotes a needle roller race mounting groove 1a of the base and a needle roller of the slider. Race installation groove 2
a, two needle roller races, 4 are located in the middle of the four needle roller races 3, and linear driving balls that contact the needle roller races at four points; The retainer retains the ball 4 so that it does not separate, and forms a linear drive rolling bearing with a needle roller race. When the slider 2 is moved in the longitudinal direction with respect to the base 1, the linear driving ball 4 is driven and guided by the needle roller race 3, and rolls on the needle roller race 3.

However, in such a conventional linear drive rolling bearing, the needle roller race for driving and guiding the linear drive ball 4 is disposed in the needle roller race mounting groove of the base and the slider. When the slider is moved with respect to the base, the needle roller race makes a small rotation or swinging motion in the needle roller race installation groove due to the behavior of the linear driving ball, and thus the needle roller race Sliding wear occurs in the installation groove and the gap becomes large, so that there is a problem that it cannot be used for high-precision applications.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention uses a needle roller race provided in a needle roller race mounting groove formed in each of a base and a slider as a drive guide. The linear drive rolling bearing is configured such that the base and the slider are relatively driven by rolling of the linear drive ball, and a leaf spring is formed on both sides of the needle roller race mounting groove. A linear drive rolling bearing is provided, wherein a leaf spring is disposed between the grooves, and the needle roller race is fixed to the needle roller race mounting groove by the leaf spring.

1 and 2 are views for explaining an embodiment of the present invention. In these figures, reference numeral 1 denotes a base formed by extrusion of an aluminum alloy, and a leaf spring mounting groove 1b having, for example, a semicircular cross section is formed near both sides of the needle roller race mounting groove 1a. Reference numeral 2 denotes a slider formed by extruding an aluminum alloy. Similar to the base 1, a leaf spring mounting groove 2b having, for example, a semicircular cross section is formed near both sides of the needle roller race mounting groove 2a. Reference numeral 3 denotes a hardened and ground needle roller race having flat surface processed portions 3a which are flat-processed at both ends, and is disposed in the needle roller race mounting groove 1a of the base and the needle roller race mounting groove 2a of the slider. Reference numeral 4 denotes a linear driving ball positioned between the four needle roller races 3, and rolls between the needle roller races 3 as a drive guide. Reference numeral 5 denotes a retainer for holding a plurality of linear driving balls 4, and reference numeral 6 denotes a leaf spring having a central portion 6a and an end portion 6b each formed in a semicircular shape as shown in FIG. By being press-fitted into the leaf spring mounting groove 1b of the base, the central portion 6a presses down the flat processing portion 3a of the needle roller race by elastic force, and fixes the needle roller race 3 to the needle roller race mounting groove 1a of the base. Similarly, when both end portions 6b are press-fitted into the leaf spring mounting grooves 2b of the slider, the central portion 6a presses the flat processed portion 3a of the needle roller race by elastic force, and the needle roller race 3 is moved to the needle roller race of the slider. It is fixed in the installation groove 2a. In this way, a linear drive rolling bearing with a needle roller race is configured. Here, the openings of the leaf spring mounting groove 1b of the base and the leaf spring mounting groove 2b of the slider are narrowed so that the press-fitted leaf spring 6 does not fall off. Next, the operation will be described as follows. When the slider 2 is moved in the longitudinal direction with respect to the base 1, the linear driving ball 4 moves while rotating on the needle roller race 3, and the retainer 5 also moves along with the linear driving ball 4. When moving, the skew generated when the linear driving ball 4 rotates acts on the needle roller race 3 as a moment load in the rotational direction.
, The rotation or swinging movement of the needle roller race 3 is suppressed. In addition, since the opening of the leaf spring mounting groove is narrow, the leaf spring can securely fix the needle roller race to the needle roller race mounting groove by the leaf spring without falling off from the leaf spring mounting groove.

According to the present invention, since the needle roller race for driving and guiding the linear driving ball is securely fixed to the needle roller race mounting grooves of the base and the slider by the leaf spring, the following effects are obtained. Can be (1) Since the minute rotation or swinging motion of the needle roller race, which conventionally occurs when the slider is moved with respect to the base, does not occur, the needle roller race mounting groove of the base and the slider on which the needle roller race is provided. It does not generate sliding wear and can be used for high-precision applications. (2) Conventionally, the needle roller races came off during assembly, making it difficult to work. However, since the needle roller races are securely fixed in the needle roller race installation grooves of the base and the slider, the work is difficult. improves. (3) In general, a shield plate is generally provided at the ends of the base and the slider so that the needle roller race does not come off, but in the present invention, the leaf spring falls off in the longitudinal direction of the needle roller race. In order to prevent this, the shield plate can be omitted.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

FIG. 2 is a view for explaining an embodiment of the present invention;

FIG. 3 is a diagram for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 1a ... Needle roller race mounting groove 1b ... Leaf spring mounting groove 2 ... Slider 2a ... Needle roller race mounting groove 2b ... Leaf spring mounting groove 3 ... Needle roller race 3a ... Plane processing part 4 ... Linear driving ball 5 ... Retainer 6: leaf spring 6a: central part of leaf spring 6b: end of leaf spring

Claims (4)

(57) [Scope of request for utility model registration] A linear driving ball is rolled between a needle roller race provided in a needle roller race mounting groove formed in each of a base and a slider as a driving guide, thereby the base and the slider. And a linear drive rolling bearing configured to be relatively driven, wherein a leaf spring is disposed between leaf spring mounting grooves formed on both sides of the needle roller race mounting groove, and the needle is driven by the leaf spring. A linear drive rolling bearing, wherein a roller race is fixed to the needle roller race mounting groove. 2. The linear drive rolling bearing according to claim 1, wherein the leaf spring and the needle roller race are in contact at an end of the needle roller race. 3. The linear drive rolling bearing according to claim 1, wherein the contact surface of the needle roller race with the leaf spring has a flat surface. 4. The linear drive rolling bearing according to claim 1, wherein the leaf spring mounting groove has a narrow opening.