JPH0353049Y2 - - 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 cage to gradually shift in one direction due to the inertial force of the cage that holds the balls, and eventually the cage stopper When the ball collides with the ball, abnormal wear occurs in that area, and sliding friction occurs due to ball misalignment, which causes seizure and shortened life of the unit.

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 increased costs 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 an approximately inverted U-shape in cross section, and has a flat upper part 4'. A sliding member 4 is integrally composed of a pair of track hanging portions 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. A ball assembly with a retainer having a raceway groove 5' corresponding to the raceway groove 3' of the raceway member 1 formed on the inner surface thereof and interposed between the raceway groove 5' and the raceway groove 3' of the raceway member 1, respectively. 6, and a horizontal link arm 7 displaceably provided on the horizontal top surface 2 of the track member 1, the retainer 6
At the center of the upper edge, support arms 6-1 and 6'-1 are provided which extend horizontally and inward at right angles to the axis of the retainer for a distance greater than 1/2 of the width of the track member 1, and are opposed from both sides. The tips of the support arms 6-1, 6'-1 of the retainers 6, 6' are overlapped and integrally connected by retainer coupling pins 8, and both retainers 6, 6' are attached to both side surfaces 3 of the raceway member. Positioned in parallel to form a rolling bearing, the horizontal link arm 7 extends its entire length to the track member horizontal top surface 2.
is smaller than the entire width of the sliding member 4, and one end of the sliding member 4
The sliding side pin 10, which is the center of rotation, is fixed to the lower surface of the flat plate-like upper part 4' of A pin 11 is loosely fitted to allow limited longitudinal displacement of the pin 11 in the elongated hole 12, and the arm 7
An elongated hole 9 similar to the elongated hole 12 is also provided in the middle part of the retainer, and through this elongated hole 9, the ends of the supporting arms 6-1 and 6'-1 of both retainers' are integrated by the connecting pin 8. A finite linear motion rolling guide unit is characterized in that the coupling pin 8 is coupled to the longitudinally limited displacement of the coupling pin 8 in the intermediate elongated hole 9, and one end of the horizontal link arm 7 is connected to the horizontal top surface of the track member. The sliding part side pin 10 is pivotally connected to a track part side pin 11 which is fixed to the rotation center of the sliding member 4, and has a long hole at the other end, and is fixed to the lower surface of the flat plate-like upper part 4' of the sliding member 4. It has been found that a unit characterized by loosely fitting the pin 10 into the elongated hole and allowing limited longitudinal displacement of the pin 10 within the elongated hole is most suitable for achieving the above object.

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. Stable control is achieved at all times through the action of the link mechanism combined with the retainer.

Embodiment FIG. 1 is a partial cross-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, in which the retainer slippage prevention link mechanism is shown as sliding. 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. Consisting of a sliding member 4 that is integrally formed of a pair of track hanging parts 5 and has a generally inverted U-shaped cross section, the sliding member 4 slidably straddles the track member 1 through a concave portion on its lower surface. Each side wall surface 3 of the raceway member 1 has a raceway groove 3' that comes into contact with a load ball 14 constituting a rolling bearing, and a corresponding track drooping portion 5 of the sliding member 4.
The sliding member side raceway groove 5' provided on the inner wall surface of each
It is comprised of a large number of balls 14 which are spaced between the two tracks and held by a cage 6 so as to be freely movable.

In order to explain the retainer slippage prevention link mechanism of the present invention, FIG. 2 conveniently removes the flat plate upper part 4' of the sliding member 4 in FIG. 1 is a perspective view clearly illustrating the retainer support linkage of the present invention; FIG. The link mechanism of the present invention is designed to connect the retainer during operation of the guide unit.
In order to prevent undesirable displacement between the engaging members, the following special configuration is provided.

As shown in FIGS. 2 and 3, the ring mechanism consists of one arm 7 having a length shorter than the full width of the track member 1, and a circular hole is formed at one end of the arm 7, into which a sliding hole is formed. A pin 10 is fixed between the both side track hanging parts 5 of the moving member 4 and to the back surface of the flat plate upper part 4'.
is fitted to position the rotational center of the arm, and a substantially oval axial elongated hole 12 is formed at the other end of the arm 7, into which a pin 11 fixed on the horizontal top surface 2 of the sliding member 1 is inserted. is loosely fitted into the elongated hole 12 so as to be displaceable in the longitudinal direction, and an elongated hole 9 of the same shape as the elongated hole 12 is further provided on the arm 7 at a position bisecting the distance between the two pins 10 and 11, The end coupling pins 8 of a pair of retainer support arms 6-1, 6'-1, which are fixed to or integrally formed with the upper edge of the retainer as described below, can be moved into the long hole 9 in the longitudinal direction. Let it fit loosely.

Pin 1 provided on the horizontal top surface 2 of the track member 1
1 is a pin 10 fixed to the back surface of the flat plate upper part 4' of the sliding member 4, and both members 1 and 4 are aligned, that is, in the non-operating state (solid line in FIG. 3), and are at symmetrical positions perpendicular to the sliding direction. Moreover, the entire arm 7 is provided in a position where it always rotates about the pin 10 within the horizontal top surface 2 of the track member during its operation.

As shown in FIG. 3, in the alignment position of the track member 1 and the sliding member 4 when the unit is not in operation,
The centers of each pin 10, 8, and 11 are in line, and the center of pin 8, the center of pin 10, and the center of pin 8 are aligned.
It can be seen that the center of the pin 11 and the center of the pin 11 are arranged at an equal distance l from each other.

As is clear from FIGS. 2 to 4, it is fixed or integrally formed at the center of the upper edge of each of the pair of cages, and has a length greater than half of the total width of the track member 1 in the direction perpendicular to the cage surface. Extending cage support arm 6-1,
6'-1 is disposed on the top plane 2 of the track member 1 so as to extend horizontally and at right angles to its axis, and the retainer is arranged such that the tips of both support arms 6-1 and 6'-1 overlap each other vertically. They are connected together by a connecting pin 8, which also passes through the intermediate elongated hole 9 of the arm 7, so that both support arms 6-1,
The overlapping tips of the arms 6'-1 are connected to each other by pins 8 across the middle elongated holes 9 of the arms 7. As shown in FIG. 4, in order to extend both support arms 6-1 and 6'-1 horizontally to the top plane 2 of track member 1, a step is provided at the mounting height position of the support arms in both cages. It would be necessary to provide one.

FIG. 3 shows a top view of the projection view of FIG.
The displacement relationship between the link mechanism and the retainer before the sliding movement (solid line) and after the sliding movement (two-dot chain line) is clearly shown.

As is clear from FIG. 3, relative reciprocating sliding movement of the sliding member 4 to the track member 1 or the sliding member 4 to the track member 1 is limited by the link mechanism, that is, the link arm 7 is , is rotated around this rotation center pin 10, and relative reciprocating movement in the sliding direction of the sliding member 4 is allowed within the range in which the outer edge of the outer end elongated hole 12 of the arm contacts the pin 11 of the track member 1. At the same time, the connecting pins 8 provided at the ends of the retainer support arms 6-1, 6'-1 of both retainers 6, which are loosely fitted and held in the elongated holes 9 approximately in the middle of each of the link arms 7, are also provided.
By coming into contact with the edge of the intermediate elongated hole 9, the retainer moves within its permissible movement range, and therefore, excessive movement of the retainer in any one direction on the track can be completely prevented.

Since the distance l between the centers of each pin 8 and 10 and the distance l between each center of pins 8 and 11 are equal and the ratio is 1:1, the sliding part side pin 10
When the arm 7 rotates with the rotation center at It is regulated to be.

In the embodiment shown in FIGS. 2 to 4, the sliding part side pin 10 is configured as the rotation center of the link arm 7, but the track part side pin 11 is used as the rotation center, and the sliding part side pin 10 is loosely inserted into the elongated hole. Similar effects can be achieved by using a fitted structure.

Effects of the invention The present invention uses a link mechanism with an extremely simple structure and 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 holder, reliably prevent excessive displacement, facilitate assembly, simplify maintenance and inspection work, and generate extremely low noise during operation.

[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... Raceway member, 4... Sliding member, 5... Track hanging part of sliding member, 6, 6'... Ball assembly with cage, 6-1, 6'-1... Cage support arm,
7... Cage support link arm, 10... Sliding part side pin, 11... Track part side pin.

Claims (1)

[Claims for Utility Model Registration] 1. A raceway member 1 having a horizontal top surface 2, having a prismatic shape with an approximately rectangular cross section, and having ball raceway grooves 3' formed on both sides thereof, and having an approximately inverted U-shape in cross section. death,
It is integrally composed of a flat plate-like upper part 4' and a pair of similar-shaped orbital hanging parts 5 hanging on both sides thereof,
A sliding member 4 rides on the raceway member 1 so as to be slidable in the axial direction, and raceway grooves 5' corresponding to the raceway member raceway grooves 3' are formed on both inner surfaces of the pair of track hanging parts 5, and The raceway groove 5' and the raceway member 1
It consists of ball assemblies with retainers 6 disposed between the raceway grooves 3' of the retainers 6, and horizontal link arms 7 displaceably disposed on the horizontal top surface 2 of the raceway members 1. At the center of the upper edge, there is a support arm 6-1 extending inwardly and horizontally at right angles to the axis of the cage for a distance greater than 1/2 of the width of the track member 1;
6′-1 and opposing cages 6 from both sides,
The tips of the support arms 6-1 and 6'-1 of 6' are overlapped and integrally connected by retainer coupling pins 8, and both retainers 6 and 6' are positioned parallel to both side surfaces 3 of the raceway member. Forming a rolling bearing, the horizontal link arm 7 has a total length smaller than the total width of the horizontal top surface 2 of the track member, and has one end connected to a rotation center fixed to the lower surface of the flat upper part 4' of the sliding member 4. It is pivotally connected to the sliding part side pin 10, and the other end has a long hole 1.
2, and a track side pin 11 fixed to the horizontal top surface 2 of the track member is loosely fitted into the pin 11.
allow limited displacement in the longitudinal direction within the elongated hole 12;
An elongated hole 9 similar to the elongated hole 12 is provided in the middle part of the arm 7, and through this elongated hole 9, the tips of the support arms 6-1, 6'-1 of the retainers 6, 6' are inserted. A finite linear motion rolling guide unit characterized in that the unit is integrally connected by a connecting pin 8 and allows limited displacement of the connecting pin 8 in the longitudinal direction within the intermediate elongated hole 9. 2. In the limited linear motion rolling guide unit according to claim 1, one end of the horizontal link arm 7 is pivotally connected to a track side pin 11 fixed to the horizontal top surface 2 of the track member and serves as a rotation center, and the other end is provided with an elongated hole, into which a sliding part side pin 10 fixed to the lower surface of the flat plate-like upper part 4' of the sliding member 4 is loosely fitted, allowing limited displacement of the pin 10 in the longitudinal direction within the elongated hole. A unit characterized by: