JPH0353050Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is used in precision assembly work of electronic parts, etc.
This invention relates to a finite linear motion rolling guide unit used under complex loads.

Prior Art and Problems to be Solved by the Present Invention Conventional limited linear motion rolling guide units have the disadvantage that when operated in relatively high-speed reciprocating motion, the problem occurs between the side surface of the raceway member and the inner surface of the sliding member. This causes the ball assembly with cage to shift, and this phenomenon of cage shift causes the ball to gradually shift in one direction due to the inertial force of the cage that holds the ball, and eventually the cage stopper The collision caused abnormal wear in that area, and sliding friction due to ball misalignment caused the unit to seize and shorten its lifespan.

In order to prevent such misalignment, methods such as roughening the surface of the balls, forming lugs on the raceway members, and attaching the pinion to the retainer have been used in the past, but these methods are insufficient to prevent misalignment. No suitable solution has been developed due to the high heat and the increased cost due to the various accessories.

Means for Solving the Problems The present invention eliminates the above-mentioned drawbacks of the conventional limited linear motion rolling guide unit, can be manufactured at low cost with the simplest mechanism, and can accurately correct the displacement during sliding operation of the cage. With the aim of providing a finite linear motion rolling guide unit that can prevent this, the following structure was devised.

That is, a raceway member 1 has a horizontal top surface 2, is prismatic with a substantially rectangular cross section, and has ball raceway grooves 3' formed on both sides of the raceway member 1, has a roughly inverted U-shape in cross section, and has a flat upper part 4'. A sliding member 4 which is integrally constructed of a pair of track hanging parts 5 of similar shapes hanging on both sides thereof and rides on the track member 1 so as to be slidable in the axial direction, and both of the pair of track hanging parts 5 A raceway groove 5' corresponding to the raceway member raceway groove 3' is formed on the inner surface, and plate-shaped connecting arms 7 are interposed between the raceway groove 5' and the raceway groove 3' of the raceway member 1, respectively. It consists of a ball retainer 6 and a horizontal link arm assembly displaceably disposed on a connecting arm 7 of the retainer 6, and the connecting arm 7 of the retainer connects a pair of retainers 6 arranged in parallel.
The centers of opposing upper edges of the cages 6 are integrally connected at right angles with respect to the surfaces of the cages 6, and the connecting arms 7 are connected to a pair of long lengths at equidistant positions close to the centers of the upper edges of each cage 6. holes 14 and 15 are formed, and the horizontal link arm assembly consists of a total of four arm members constituting two pairs of upper and lower links having similar structures, each of the arm members 10 and 11 of each pair of links having a similar structure. One arm member 11 is shorter than the entire length of the retainer connecting arm 7.
When forming a link pair by forming the other arm member 10 into a planar shape and the other arm member 10 into a stepped planar shape, both arm members 10,
The upper link pair is configured such that one end of the upper link 11 is in overlap contact and the other extends on the same plane, and the upper link pair is fixed to the lower surface of the flat plate upper part 4' of the sliding member 4 and on its central longitudinal axis at the overlap contact end. , is pivotally connected to the sliding part side pin 8 which is the center of rotation of the link pair, and the lower link pair is similarly fixed on the central vertical axis of the horizontal top surface 2 of the track member at its overlapping contact end. The other ends of each pair of upper and lower links have mutually corresponding ends that pass through a pair of elongated holes 14 and 15 provided in the retainer connecting arm 7. Pivot pins 12 and 13 are pivotally connected on the upper and lower surfaces of the connecting arm, respectively, and each pair of links is provided on the connecting arm 7 with each of the sliding part side pin 8 and the track side pin 9 as the center of rotation. A finite linear motion rolling guide unit, which is characterized by forming a pantograph-shaped horizontal link arm assembly that can be displaced in the horizontal axis direction within the long diameter range of the pair of long holes 14 and 15, is most suitable for achieving the above object. It was accompanied by that.

By configuring as described above, even if the sliding member is subjected to high-speed reciprocating sliding movement on the raceway member, the displacement on the orbit of the ball assembly with cage, which is interposed as a rolling bearing between the side walls of both members, can be prevented. The action of the pantograph link mechanism combined with the retainer provides stable control at all times and limits stress on the retainer only in its sliding direction.

Embodiment FIG. 1 is a partial sectional projection view showing the basic structure of the linear motion rolling guide unit of the present invention, and is partially cut away to show the ball retainer 6, in which the retainer slippage prevention link mechanism is shown in the sliding motion. It is hidden behind the lower surface of member 4 and is not shown.

As shown in FIGS. 2 and 3, the finite linear motion rolling guide unit of the present invention includes a prismatic raceway member 1 with a substantially rectangular cross section, a flat top portion 4' having a flat top portion, and a flat top portion 4' that hangs down on both sides with respect to its vertical axis. It is composed of a pair of track hanging parts 5 and has a generally inverted U-shaped cross section as a whole, and the track member 1
The raceway member 1 has a raceway groove 3' on each side wall surface 3 of the raceway member 1, which contacts a load ball 14 constituting a rolling bearing.
A corresponding sliding member raceway groove 5' is provided on the inner wall surface of each of the track hanging portions 5 of the sliding member 4,
It is composed of a large number of balls 24 which are spaced between the two tracks and held by a cage 6 so as to be freely movable.

FIG. 2 is a perspective view showing the horizontal top surface 2 of the track member and the top surface of the track hanging portion with the flat plate upper part 4' of the sliding member 4 in FIG. , which clearly shows the horizontal link mechanism for cage displacement control of the present invention. The link mechanism of the present invention has the following special configuration to prevent undesirable displacement between the retainer and its engaging members during operation of the guide unit.

As is clear from FIGS. 2 to 4, the pair of retainers 6 are fixed or integrally formed at the center of the upper edge of each retainer, and are perpendicular to the surface of the retainer 6, extending over the entire width of the track member 1. A plate-shaped retainer connecting arm 7 extending horizontally across the retainers is provided to connect both retainers together. A pair of axial long diameter oval long holes 14 and 15 are formed at the positions.

As clearly shown in FIGS. 2 and 3, the horizontal link arm assembly constituting the link mechanism consists of a combination of upper and lower link pairs with similar structures, each link pair having two different shapes. It is composed of arm members 10 and 11, and thus the assembly is composed of four arm members of two types in total.

Each arm member 10, 11 has substantially the same axial length that is shorter than the entire length of the retainer connecting arm 7, and has a planar shape 1.
It is divided into two types: 1 and stepped type 10.

The plane arm 11 is a flat strip piece with a circular hole at each end, and the stepped plane arm 10 has a step 16 shown in FIG. It has substantially equal axial length and has a circular hole at each end.

The horizontal link arm assembly of this invention is of the above two types 4.
The arm members 10 and 11 are constructed as follows.

As shown in FIGS. 3 and 4, first, one end of the planar arm 11 and the upper end of the stepped planar arm 10 are overlapped and brought into contact with each other, and the circular holes at each end are concentrically inserted into the sliding member 4. The upper link pair is pivotally connected to a sliding part side pin 8 fixed on the lower surface of the flat plate upper part 4' and on its center vertical axis.

Similarly, the lower link pair is connected to one end of the planar arm 11 and the upper end of the stepped planar arm 10.
Align and overlap each circular hole, and then
The lower link pair is pivotally connected to a track side pin 9 fixed on the center vertical axis of the horizontal top surface 2 of the lower link pair.

The free ends of the pairs of upper and lower links each configured as described above maintain the mutually corresponding ends in alignment with the circular holes provided therein, and the vertical shafts provided at both ends of the retainer connecting arm 7, respectively. Directional long hole 1
4 and 15, and the long holes 14 and 15 are opposite to each other.
The centering circular holes of the free ends of both the upper and lower link pairs are pivotally connected via the elongated holes by pivot pins 12 and 13 passed through each of them. Therefore, each corresponding free end of the pair of upper and lower links can rotate about the pivot pins 12, 13, and are loosely fitted together with the pivot pins 12, 13 into the elongated holes 14, 15 at both ends of the retainer connecting arm 7 so as to be movable in the longitudinal direction. As clearly shown in FIG. 3, the distances between the respective centers of the sliding section side pin 8 and the track section side pin 9 and the centers of the respective pivot pins 12 and 13 are always kept equal.

As shown in FIG. 4, the horizontal link arm assembly is constituted by a pair of upper and lower links, and each pair is constituted by a plane arm 11 and a plane arm 10 with a step, so that the upper and lower links are combined with the retainer connecting arm 7. is always kept horizontal to the top and bottom surfaces of the

As is clear from FIG. 3, the horizontal link arm assembly of the present invention configured as described above allows
The relative reciprocating sliding movement of the track member 1 with respect to the sliding member 4 or the sliding member 4 with respect to the track member 1 is restricted, that is, the arms of the upper and lower link pairs are
Pivot pin 1 which pivots on its center of rotation pins 8 and 9 and pivots the outer end of said respective arm.
2 and 13 are provided at both ends of the connecting arm 7.
5 is moved in the longitudinal direction to provide a pantograph type link, and within the range of movement, the upper and lower link pairs are allowed to perform axisymmetric relative reciprocating motion with respect to the connecting arm 7, and are constantly connected to the retainer during the movement. The arm 7 is held midway in the sliding direction between the sliding part side pin 8 and the track part side pin 9, so that excessive movement of the retainer in any one direction on the track can be completely prevented.

Effects of the invention The present invention has an extremely simple structure and uses a link mechanism with a small width (that is, smaller than the total width of the track member 1), and since one link arm is sufficient, the unit can be manufactured easily and at low cost. It can stably support the ball retainer and reliably prevent excessive displacement, and the position control action on the retainer is performed by force only in the sliding direction, reducing mechanical friction and making assembly easier. Maintenance and inspection work is easy, and noise during operation is extremely low.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional projection view showing the basic structure of the linear motion rolling guide unit of the present invention, with a part cut away to show the ball retainer 6, and Fig. 2 shows one of the specific examples of the present invention. 3 is a partially cutaway perspective view with the flat plate-like upper part of the sliding member 4 removed to clearly show the device displacement prevention link mechanism; FIG. 3 is a top view of the projected view of FIG. 2; and FIG. is a cross-sectional view taken along a plane perpendicular to the axial direction of FIG. 3; DESCRIPTION OF SYMBOLS 1... Track member, 4... Sliding member, 5... Track hanging portion of sliding member, 6, 6'... Ball assembly with retainer, 7... Retainer connecting arm, 8... Sliding Part side pin, 9... Track part side pin, 10... Stepped plane arm member, 11... Plane arm member, 12, 13
...Pivot pin.

Claims (1)

[Scope of utility model registration request] A raceway member 1 has a horizontal top surface 2, is prismatic with a substantially rectangular cross section, and has ball raceway grooves 3' formed on both sides thereof. a sliding member 4 which is integrally constructed from a pair of track hanging parts 5 of similar shapes hanging on both sides, and rides on the track member 1 so as to be able to freely slide in the axial direction;
A raceway groove 5' corresponding to the raceway groove 3' of the raceway member 1 is formed on both inner surfaces of the pair of raceway hanging parts 5, and a space is formed between the raceway groove 5' and the raceway groove 3' of the raceway member 1, respectively. It consists of a ball holder 6 with a plate-shaped connecting arm 7 placed thereon, and a horizontal link arm assembly displaceably provided on the connecting arm 7 of the holder 6, and the connecting arms 7 of the holder are arranged in parallel. The opposing upper edge centers of a pair of retainers 6 are integrally connected at a right angle with respect to the surface of each retainer 6, and the connecting arms 7 are arranged at equal distances close to the upper edge center of each retainer 6. A pair of elongated holes 14 and 15 are formed at the positions of , and the horizontal link arm assembly consists of a total of four arm members constituting two upper and lower link pairs having similar structures, and the arm member 10 of each link pair . 1
1 is configured such that one end thereof is in overlapping contact and the other end extends on the same plane, and the upper link pair is connected to the lower surface of the flat plate upper part 4' of the sliding member 4 and on its central longitudinal axis at the overlapping contact end. The lower link pair is similarly fixed on the central longitudinal axis of the horizontal top surface 2 of the track member at its overlapping contact end. It is pivotally connected to the track side pin 9 which is the center of rotation of the link pair, and the other ends of each of the upper and lower link pairs pass through a pair of elongated holes 14 and 15 provided in the retainer connecting arm 7 with mutually corresponding ends. The connecting arm is pivoted on both upper and lower surfaces of the connecting arm by loosely fitting pivot pins 12 and 13, and each pair of links rotates around the sliding part side pin 8 and the track side pin 9, respectively. A finite linear motion rolling guide unit comprising a pantograph-shaped horizontal link arm assembly that can be displaced in the horizontal axis direction within the long diameter range of a pair of long holes 14 and 15 provided in the finite linear motion rolling guide unit.