JPH05272534A - Direct acting bearing device - Google Patents

Abstract

PURPOSE:To simplify operation of housing and sufficiently secure storage of lubricating oil in case of housing rolling bodies in a plurality of through-holes formed in a sleeve of a direct-acting bearing device each under a condition of slipping prevention. CONSTITUTION:A circular deep groove is formed at least on an outer peripheral surface side of a sleeve 31 of a through-hole 4, concentrically to the through-hole 4. The inner peripheral area of the groove is plastically deformed inward for forming a slipping-prevention part of a rolling body 32. The rolling body is press-fitted from a previously formed circular projection into the through-hole 4. A holder for housing the rolling body is press-fitted into the through-hole 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a linear motion bearing device, and more particularly,
The present invention relates to an improvement of a bearing sleeve that is interposed between a shaft and a tubular portion that is fitted onto the shaft and is fitted in a pair.

[0002]

2. Description of the Related Art In a die set or the like in which a die is set, as shown in FIG. 1, a punch holder (1)
The guide post (21) attached to the die holder (2) fits into the bush (11) of the
The linear motion bearing device (3) is interposed between (11).

This linear motion bearing device (3) is equipped with a large number of rolling elements (32) (32) such as balls in a sleeve (31) loosely fitted in a gap between a bush (11) and a guide post (21). It was made. Each rolling element (32) is rotatably accommodated within the thickness of the sleeve (31), and as shown in FIG. 2, a part of the rolling element (32) is exposed inside and outside the sleeve (31). Bush exposed (11)
Alternatively, it makes rolling contact with the surface of the guide post (21). Therefore, since the bush (11) and the guide post (21) are in rolling contact with each other through the large number of rolling elements (32) (32),
The sliding resistance between the punch holder (1) and the guide post (21) is extremely reduced, and the punch holder (1) supported by the multiple guide posts (21) (21) is fixed to the die holder (2). Raises and lowers smoothly in a posture.

During this operation, the amount of movement of the bush (11) with respect to the guide post (21) and the sleeve (3) of the linear motion bearing device (3).
Since the amount of movement of 1) is different, a part of the linear motion bearing device (3) is often exposed below the bush (11). In this state, in order to prevent the rolling elements (32) (32) from falling off the sleeve (31), the through hole (4) formed in the sleeve (31) so as to accommodate each rolling element (32), Rolling element (32)
Larger than that of the annular protrusions (41) (4
2) is formed, and the size of the inner peripheral part of this annular convex part is set to the rolling element.
It is smaller than the size of (32).

Therefore, in this conventional device, the sleeve is
When accommodating the rolling element (32) inside the (31) in a retaining state,
A large number of through holes (4) and (4) provided with an annular convex portion (41) are formed in advance on the inner peripheral side of the sleeve (31), and the rolling element (4) is formed in each through hole (4) as shown in FIG. 32) is accommodated, and in this state, the annular groove is formed on the outer peripheral surface side of the sleeve (31) by the caulking die (K).
(43) is formed concentrically with the through hole (4). Then, due to the formation of the annular groove portion (43), the inner peripheral portion thereof protrudes inward to form the annular convex portion (42) as shown in FIG.

However, in this conventional type, the pressing force at the time of crimping by the crimping type (K) becomes large, and in this respect, the manufacture of the linear motion bearing device (3) is troublesome and the through hole ( 4) It is difficult to secure concentricity between the annular groove (43) and
In this case, the degree of protrusion of the annular convex portion (42) becomes uneven, and the rolling element (32) easily comes out. Also, if the caulking degree of each through hole (4) becomes uneven, in the case of a sleeve (31) made of a material such as aluminum, this sleeve (31)
The roundness, straightness, and the like of the are impaired, and the movement resistance increases. On the contrary, in order to secure the concentricity, it is necessary to accurately position the through hole (4) and the caulking die (K), which results in poor productivity.

According to the present invention, "a sleeve (31) is loosely fitted between the shaft (20) and the bush (11), and a large number of through holes (4) (4) penetrating the sleeve (31) in and out. ) Are provided to expose the inside and outside of the sleeve (31) in each through hole (4), and the shaft portion (20) and bush are
In the linear motion bearing device in which the rolling element (32) pressed against the surface of (11) is housed in a retaining state, it is possible to simplify the production of this linear motion bearing device, and each rolling element (32) It is an object of the present invention to prevent the eccentricity of the sleeve (31) due to the construction of the retaining structure and to ensure smooth operation. [Invention of Claim 1]

[0008]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is that "the through hole (4) has an annular convex portion (41) on the inner peripheral surface side of the sleeve (31) and an outer peripheral surface side. The annular convex portion (42) is formed, and the annular convex portion (42) is formed through the entire inner peripheral portion of the annular deep groove portion (44) deeply formed concentrically with the through hole (4).
It was formed by plastic deformation on the inner side of (4).

[0009]

The above technical means operates as follows. The annular convex portion (42) is formed by plastically deforming the inner peripheral portion of the annular deep groove portion (44) deeply formed concentrically with the through hole (4) in advance to the inner peripheral side of the through hole (4). ing. Therefore, an excessive plastic working force does not act on the sleeve (31) when forming the annular convex portion (42). Moreover, since the annular deep groove portion (44) formed concentrically with the through hole (4) is plastically deformed in advance, the annular convex portion (4
The protrusion margin of 2) is uniform over the entire circumference.

[0010]

[Effect] Since an excessive plastic working force does not act on the sleeve (31) when forming the annular convex portion (42), it is necessary to form a large number of annular convex portions (42) in the main linear motion bearing. The manufacturing of the device can be simplified. Since the protruding margins of the annular convex portions (42) are made uniform, the rolling elements (32) are less likely to come off, and the rotation of the rolling elements (32) within the through hole (4) is also smooth, which results in linear transmission. The performance is good.

Since the annular deep groove portion (44) is deeper than the annular groove portion (43) formed during crimping by the conventional crimping type (K), it becomes a groove sufficient to retain the lubricating oil, so that it can be directly moved. The lubrication performance of the part is stable over a long period of time. [Invention of Claim 2] The present invention is to solve the same problem as that of the invention of Claim 1 above.

[0012]

[Technical Means] The technical means adopted for this purpose is "annular protrusions on the inner peripheral surface side end of the sleeve (31) of the through hole (4).
(41) at the end on the outer peripheral surface side of the sleeve (31) with an annular protrusion (4
2) are formed respectively, and these annular protrusions (41) or annular protrusions are formed.
A concentric annular deep groove portion (44) is formed on the outer peripheral side of (42), and the size of the inner periphery of the annular convex portion (41) and the annular convex portion (42) is set to the rolling element.
The size of the outer circumference of (32) is set smaller, and the size of the inner circumference of the central part of the through hole (4) is set larger than the size of the outer circumference of the rolling element (32). The size of the annular convex portion (41) or the annular convex portion (42) provided with (44) is set to a size such that the rolling element (32) can be press-fitted, and each through hole (4)
It contains the rolling element (32) inside. "

[0013]

[Operation / Effect] In this structure, since the inner diameters of the annular convex portion (41) and the annular convex portion (42) are smaller than that of the rolling element (32), the rolling element housed in the through hole (4). (32) does not escape carelessly. Further, in order to accommodate the rolling element (32) in the through hole (4), the annular convex portion (41) or the annular convex portion having the annular deep groove portion (44) is provided.
Since only the rolling element (32) is press-fitted from one side of (42),
The conventional caulking work becomes unnecessary. [Invention of Claim 3] The present invention is to solve the same problem as that of the invention of Claim 1 above.

[0014]

[Technical means] The technical means adopted for this purpose are
“The through hole (4) should be provided on the inner surface of the sleeve (31) with an annular protrusion (4
1) is formed and is opened to the outer peripheral surface side of the sleeve (31), and a cylindrical holding body (46) having an annular convex portion (42) protruding on the inner periphery of the outer end is provided on the sleeve (31). Press-fit from the outer peripheral side,
The rolling element (32) is rotatably housed between the holding body (46) and the annular convex portion (42), and the inner peripheral surfaces of the annular convex portion (41) and the annular convex portion (42) are rolling elements (32 ) Smaller than the outer circumference of the holding body (46) and the annular deep groove between the outer circumference of the outer end of the holder (46) and the inner peripheral surface of the through hole (4).
(44) was formed. "

[0015]

[Operation and effect] The rolling element (32) is housed between the holding body (46) press-fitted into the through hole (4) and the annular convex portion (41).
(32) can rotate freely. Since the holding body (46) is simply press-fitted to house the rolling element (32) in each through hole (4), the conventional caulking work is unnecessary. Also, the holder (46)
Since the annular deep groove portion (44) surrounding the holding body (46) is formed on the outer periphery of the outer end portion of the holding body (46) by press-fitting the holding body (46), the annular deep groove portion (44) collects the lubricating oil. Function as.

[0016]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. [Embodiment 1] In Embodiment 1 shown in FIG. 4, a linear motion bearing device (3) interposed between a guide post (21) and a bush (11) of a die set is installed in the same manner as the conventional example described above. An annular deep groove portion (44) concentric with the through hole (4) is formed on the outer peripheral surface of the sleeve (31) by lost wax. A steel ball (32a) is used as the rolling element (32).

The sleeve (31) is made of aluminum,
It has a wall thickness of about 3.5 mm and a steel ball (32a) diameter of 4 m.
It is set to about m. And the annular deep groove portion (44)
Is formed at the same time when the material is formed into a tubular shape by the lost wax manufacturing method, and the width of the annular deep groove portion (44) is
The depth is set to about 0.3 to 0.5 mm and the depth is set to about 0.6 to 1.0 mm.

The inner diameter of the through hole (4) needs to be set to a size such that the steel ball (32a) is loosely fitted and can rotate freely.
In this example, the diameter of the steel ball (32a) is 0.5 mm to 0.
The diameter is set to 8 mm. In addition, the sleeve (3
An annular convex portion (41) projects from the inner peripheral surface side of 1). The steel balls (32a) are separately housed in the through holes (4) of the sleeve (31) formed as described above, and are concentrically arranged at the outer ends of the through holes (4) as shown in FIG. Caulking type (K) in the formed annular deep groove (44)
Correspondingly, when the wedge-shaped annular protruding portion of this caulking type (K) is press-fitted into the annular deep groove portion (44), an annular shape formed between the through hole (4) and the annular deep groove portion (44) is formed. The tongue piece is bent toward the inner peripheral side to be in the state of FIG. 4, and the steel balls (32a) are housed in a state where they are not pulled out.

The inner diameters of the annular protrusions (41) (42) are equal to those of the steel balls (3
The size may be such that a part of 2a) is exposed to the outside and the steel ball (32a) is allowed to rotate. In extreme cases, steel balls (3
The value may be slightly smaller than the diameter of 2a). [Embodiment 2] Embodiment 2 shown in FIG. 6 eliminates the need for a caulking process using a caulking die (K), in which annular protrusions (41) (42) are provided at both ends of the through hole (4). An annular deep groove portion (44) is formed on the inner peripheral surface and the outer peripheral surface of the sleeve (31) so as to project from the circumference and is concentric with the through hole (4).

The depth of the annular deep groove portion (44) is the same as in the first embodiment.
In this embodiment, the inner diameter of at least one of the annular projections (42) is 0.2 to 0 than the diameter of the steel balls (32a).
It is set to about 5 mm smaller. In this one, steel balls (3
Since the diameter of 2a) is the above value and the annular deep groove portion (44) having a predetermined depth is formed on the outer peripheral portion of the annular convex portion (42), the inner peripheral surface of the annular deep groove portion (44) is The tubular portion formed on the side is elastically deformable. Therefore, the annular projection of each through hole (4)
When the steel ball (32a) is press-fitted from the (42) side, the steel ball (32a) is rotatably housed in each through hole (4) as shown in the figure.

In this embodiment also, the sleeve (31)
As a lost wax, the same material is used. Also, to facilitate the press-fitting work of the steel ball (32a),
As shown in FIG. 7, slits (S) (S) opened in the axial direction are formed in a part of the cylindrical portion (45) formed between the annular convex portion (42) and the annular deep groove portion (44). do it. As a result, the arcuate tongue between the slits is easily bent, and the work of press-fitting the steel ball (32a) is facilitated.

In this embodiment, since the annular deep groove portion (44) is formed on both the inner peripheral surface and the outer peripheral surface of the sleeve (31), the annular lubricating oil reservoir is formed on both inner and outer surfaces of the sleeve (31). Part will be formed. In the above embodiment, the through hole (4)
Although the steel ball (32a) is press-fitted from one side, the steel ball (32a) may be press-fitted from either the annular projection (41) or the annular projection (42). [Embodiment 3] In this embodiment, as shown in FIG. 8, a steel ball is inserted into the through hole (4) by press-fitting a sleeve (31) and a separate holding body (46) into the through hole (4). (32a) is to be accommodated. In this case, as shown in the figure, the diameter of the through hole (4) is made to substantially match the diameter of the body of the holding body (46), and the outer peripheral surface side of the sleeve (31) in the through hole (4). A certain range of is the enlarged diameter portion (47), and the depth of the enlarged diameter portion (47) from the outer peripheral surface of the sleeve (31) is 0.6 to 1.
It is set to about 0 mm.

The overall height of the holder (46) is determined by the sleeve.
It is set to be slightly smaller than the wall thickness of (31), and the through hole
(4) When press-fitted into the inside, as shown in the figure, the end surface provided with the annular convex portion (42) is set so as to match the outer peripheral surface of the sleeve (31) or be located within the wall thickness. .. In this structure, when the steel ball (32a) is housed in each through hole (4) and the holding body (46) is press-fitted from the enlarged diameter portion (47) side, as shown in the figure,
The steel ball (32a) is accommodated in the body of the holder (46), the holder (46) is fixed within the wall thickness of the sleeve (31) by the press-fitting, and the steel ball (32a) is prevented from coming off. Is housed in a state. Further, on the outer peripheral surface of the sleeve (31), an annular deep groove portion (44) constituted by the holding body (46) and the enlarged diameter portion (47) is formed, which serves as a lubricating oil storage portion.

The material of the holder (46) may be made of metal or synthetic resin such as polyacetal resin. Further, in this embodiment, the holders (46) press-fitted into the through holes (4) are independent for each through hole (4), but these holders (46) are connected by the thin connecting piece. It can also be configured. In this case, as shown in FIG. 11, a group of holders (46) (46) arranged in the same circumference of the sleeve (31) are connected by a thin connecting piece (48) so that the sleeve (31). If the holders (46) and (46) are attached to the through holes (4), they can be housed and fixed in the through holes (4) without using press fitting.

In this type of structure, as shown in FIG. 9, the holders (46) (46) are arranged at an arrangement pitch that matches the pitch of the through holes (4) (4) arranged in the same circumference. The thin connecting piece (48)
It is convenient to cut and use the continuous body connected by (48) at a predetermined place. Further, as shown in FIG. 11, a concave groove (33) for connecting the through hole (4) and the through hole (4) is formed on the outer peripheral surface of the sleeve (31) at a position corresponding to the thin connecting piece (48). That is, when the sleeve (31) containing the steel balls (32a) (32a) is interposed between the guide post (21) and the bush (11), the thin connecting piece (48) becomes an obstacle. Don't worry.

Further, the through holes (4) (4) arranged in the same circumference.
It is also conceivable to connect the holders (46) (46) in a ring shape by the thin connecting piece (48) in the same number as in FIG.
The connecting body (U) of the holding bodies (46) (46) formed as shown in 0 is forcibly fitted onto the sleeve (31) so that each holding body (46) is housed in each through hole (4). .. In this case, since each holding body (46) is housed and fixed in the through hole (4) by the elastic return force of the thin connecting piece (48), the height of each holding body (46) is as shown in FIG. It may be set shorter than the case.

In some cases, all of the holders (46) (46) housed in the through holes (4) (4) of the sleeve (31) are connected by thin connecting pieces (48) (48). It may be integrated.
Although the steel balls (32a) are adopted as the rolling elements (32) in any of the above-mentioned embodiments, they may be rolls or needles. It can also be used as a linear motion bearing device other than the die set.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional die set.

[Fig. 2] Detailed sectional view of the linear motion bearing device (3).

FIG. 3 is an explanatory view of a method of housing the rolling element (32) in a retaining state.

FIG. 4 is a cross-sectional view of a main part of the first embodiment.

[Fig. 5] Detailed view of caulking process

FIG. 6 is a cross-sectional view of a main part of the second embodiment.

FIG. 7 is an explanatory diagram of a modified example of a main part of this embodiment.

FIG. 8 is a cross-sectional view of a main part of the third embodiment.

FIG. 9 is a perspective view when the holding bodies (46) (46) are connected in a chain shape.

FIG. 10 is a connecting body (U) in which the holding bodies (46) (46) are connected in a ring shape.
Top view of

FIG. 11 is a cross-sectional view when the connecting body (U) is attached to the sleeve (31).

[Explanation of symbols]

 (20) ・ ・ ・ Shaft (11) ・ ・ ・ Bushing (31) ・ ・ ・ Sleeve (4) ・ ・ ・ Through hole (32) ・ ・ ・ Rolling element (41) ・ ・ ・ Annular projection (42)・ ・ ・ Annular protrusion (44) ・ ・ ・ Annular deep groove (46) ・ ・ ・ Holder

Claims (3)

[Claims] 1. A sleeve (31) is loosely fitted between a shaft portion (20) and a bush (11), and a plurality of through holes (4) (4) penetrating inward and outward are provided in the sleeve (31). , Sleeve (31) in each through hole (4)
In the linear motion bearing device in which the rolling element (32) which is exposed to the inside and outside of the shaft and is pressed against the surfaces of the shaft portion (20) and the bush (11) is housed in the retaining state, the through hole (4) is An annular convex portion (41) is formed on the inner peripheral surface side of (31) and an annular convex portion (42) is formed on the outer peripheral surface side, and the annular convex portion (42) is concentric with the through hole (4). A linear motion bearing device formed by plastically deforming the entire inner peripheral portion of the deep annular groove (44) to the inner peripheral side of the through hole (4). 2. A sleeve (31) is loosely fitted between the shaft portion (20) and the bush (11), and a large number of through holes (4) (4) penetrating inside and outside are provided in the sleeve (31). , Sleeve (31) in each through hole (4)
In the linear motion bearing device in which the rolling elements (32) exposed to the inside and outside of the shaft and pressed against the surfaces of the shaft portion (20) and the bush (11) are housed in the retaining state, the sleeve (31) of the through hole (4) is ), An annular protrusion (41) is formed at the end on the inner peripheral surface side, and an annular protrusion (42) is formed at the end on the outer peripheral surface side of the sleeve (31). Alternatively, a concentric annular deep groove portion (44) is formed on the outer peripheral side of the annular convex portion (42), and the size of the inner peripheral portion of the annular convex portion (41) and the annular convex portion (42) is set to the rolling element (32). The size of the inner periphery of the through hole (4) is set larger than the outer periphery of the rolling element (32), and the annular deep groove (44) is formed on the outer periphery. The size of the inner circumference of the annular convex portion (41) or the annular convex portion (42) provided with is set such that the rolling element (32) can be press-fitted, and the rolling element (32) is inserted in each through hole (4). ). 3. A sleeve (31) is loosely fitted between the shaft (20) and the bush (11), and a large number of through holes (4) (4) penetrating inward and outward are provided in the sleeve (31). , Sleeve (31) in each through hole (4)
In the linear motion bearing device in which the rolling element (32) which is exposed to the inside and outside of the shaft and is pressed against the surfaces of the shaft portion (20) and the bush (11) is housed in the retaining state, the through hole (4) is An annular convex portion (41) is formed on the inner peripheral surface side of (31) and is opened to the outer peripheral surface side of the sleeve (31), and a cylindrical shape in which the annular convex portion (42) is projected on the inner peripheral surface of the outer end portion. The holding body (46) is press-fitted from the outer peripheral surface side of the sleeve (31), the rolling element (32) is rotatably accommodated between the holding body (46) and the annular convex portion (42), and the annular convex portion is formed. The inner circumferences of the portion (41) and the annular convex portion (42) are set smaller than the outer circumference of the rolling element (32), and the outer circumference of the outer end of the holding body (46) and the inner peripheral surface of the through hole (4) are set. A linear motion bearing device having an annular deep groove portion (44) formed therebetween.