JP2007107639A - Energizing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve flexibility in design by providing an energizing function without using a coil spring or the like, supporting a load acting between a first member and a second member by rolling elements, using design of a deformed raceway surface, and providing free design of spring rigidity or the like. <P>SOLUTION: The energizing device 1 has the first member 3 having a first raceway surface 3f, the second member 5 having a second raceway surface 5f facing the first raceway surface 3b and capable of carrying out relative linear movement with respect to the first member 3, and the rolling elements 6 interposed so as to roll between the first raceway surface 3f and the second raceway surface 5f. At least one of the first raceway surface 3f and the second raceway surface 5f has the deformed raceway surfaces 3k, 5k applying energizing force resolving relative displacement between the first member 3 and the second member 5 caused by the relative linear movement, between the members 3, 5, in at least one part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a biasing device having spring elasticity.

As an urging device that imparts spring elasticity in the compression direction or tension direction, a device using a coil spring (compression coil spring, tension coil spring, or the like) or an elastic member (rubber or the like) is widely used. For example, an urging device using a coil spring is elastically deformed with respect to the axial displacement of the coil spring and applies an urging force in a direction to eliminate the displacement to the outside. Such a biasing device is used by being incorporated in various applications requiring spring elasticity, for example, a spring-type elastic shaft coupling shown in Patent Document 1 (see Patent Document 1).
JP-A-7-224850

However, the conventional urging device using a coil spring or the like has various problems.
First, the conventional urging member has a problem that it is likely to deteriorate due to continuous use or aging, and its life is short.
Second, the conventional urging device has a problem that the degree of freedom in design is low. For example, in order to change the spring stiffness, in the case of a coil spring, the number of turns and the winding diameter are changed, and when an elastic member such as rubber is used, the material and thickness of the elastic member are changed. The range of spring stiffness that can be obtained is limited. Therefore, in the conventional urging member, the range of spring rigidity obtained with the same size (physique) was extremely limited. Furthermore, in the conventional urging member, the relationship between the displacement and the spring constant is linear, and the spring constant cannot be changed freely according to the displacement, such as changing the spring constant nonlinearly with respect to the displacement. .
Third, the conventional urging device requires a second member that moves relative to each other and a joining portion that joins the urging member such as a coil spring with the first member, and the peripheral structure becomes complicated. In addition, there is a problem in that reliability increases as assembly cost increases.
Fourth, the conventional urging device has a low degree of design freedom as described above, and the peripheral structure tends to be complicated. Therefore, the size (physique) of the urging device tends to increase, and there is a limit to downsizing.

As described above, the urging device using the coil spring has various problems. On the other hand, the present invention is a member having a new structure based on a completely different technical idea from the conventional one, and is an urging device that can solve the above problems.
That is, an object of the present invention is to obtain an epoch-making urging device that solves various problems of conventional urging members such as coil springs.

  The present invention includes a first member having a first raceway surface, a second member having a second raceway surface facing the first raceway surface and capable of relatively linear movement between the first member, A rolling element interposed between the one raceway surface and the second raceway surface so as to be capable of rolling, wherein at least one of the first raceway surface and the second raceway surface is a relative straight line between the first member and the second member. The urging force in a direction to eliminate the relative displacement between the first member and the second member caused by the relative linear movement by gradually reducing the holding interval of the rolling elements while rolling the rolling elements with the movement. The urging device is characterized in that it has at least a part of a deformed raceway surface for imparting a gap between the members.

  According to such a configuration, an urging function (hereinafter also referred to as spring property) can be provided without using a coil spring or the like. Furthermore, the load acting between the first member and the second member can be supported by the rolling elements. Moreover, the spring rigidity and the like can be freely designed by designing the irregular raceway surface, and the degree of freedom in design becomes extremely high.

  In the urging device, the deformed raceway surface may have a curved surface whose cross section in the moving direction of the relative linear movement is a concave curve. In this case, if it does in this way, it will become easy to roll a rolling body more smoothly and to contact movement with the said relative linear movement. Moreover, it becomes easy to make small the rate of change of the rolling element pinching | interval space | interval which becomes gradually narrow with the relative linear movement between said 1st member and 2nd member. Therefore, it becomes easy to ensure the spring property over a wider relative displacement range.

In this urging device, the first member has a tubular outer portion and the inner surface of the outer portion is the first raceway surface, and the inner portion is arranged coaxially with the outer portion and inside the outer portion. And the outer surface of the inner portion is the second raceway surface, and the deformed raceway surface provided on at least one of the inner surface of the outer portion and the outer surface of the inner portion. The first raceway surface, the second raceway surface, and the rolling elements are equally arranged around the axis, and the outer side portion and the inner side portion are movable relative to each other in the axial direction while maintaining a coaxial state. It is good also as composition which has.
In this way, since the rolling elements are arranged between the tubular outer part and the inner part arranged on the inner side, by providing a deformed raceway surface on the inner surface of the outer part or the outer surface of the inner part, A configuration in which the holding interval of the rolling elements is gradually narrowed by the relative linear movement of the first member and the second member in the axial direction can be easily obtained. Further, since the raceway surface and the rolling elements are equally arranged around the axis, the force in the direction perpendicular to the axis is canceled out of the forces acting on each member as the rolling elements are compressed. Therefore, a configuration in which an urging force in the axial direction is generated with relative linear movement between the first member and the second member can be easily obtained.

  An urging device having excellent characteristics can be obtained by a technical idea completely different from the conventional technology in which spring property is imparted between members that can move relatively linearly by a deformed raceway surface.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a cross-sectional view (longitudinal cross-sectional view) of an urging device 1 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. It is sectional drawing in the BB line.
The biasing device 1 has a first member 3 having a first raceway surface 3f and a second raceway surface 5f opposite to the first raceway surface 3f and a relative linear movement (relative translational movement) between the first member 3 and the first member 3. ) And a cylindrical roller 6 as a rolling element interposed between the first raceway surface 3f and the second raceway surface 5f so as to allow rolling.

The first member 3 has a substantially rectangular parallelepiped outer surface, a hollow portion t inside, and an open shape so that the hollow portion t communicates with the outside on one end side in the longitudinal direction. ing. That is, the first member 3 has a tubular outer portion 3a having a substantially quadrangular cross section and a bottom portion 3b that closes the other end in the longitudinal direction of the outer portion 3a.
On the other hand, the second member 5 has an inner portion 5 a inserted from the open end side of the first member 3 into the outer portion 3 a of the first member 3. And the cylindrical roller 6 is interposed between the outer side part 3a of the 1st member 3, and the inner side part 5a of the 2nd member 5 so that rolling is possible.

The first member 3 and the second member 5 are capable of reciprocating relative to each other in the axial direction (longitudinal direction of the inner portion 5a and the outer portion 3a) like a piston motion. When the first member 3 and the second member 5 are moved relatively linearly, the respective cylindrical rollers 6 interposed between the first member 3 and the second member 5 roll and contact.
However, as shown in FIG. 1, the first raceway surface 3 f provided on the first member 3 has a cross section in the relative linear movement direction (that is, the axis z direction) between the first member 3 and the second member 5. The shape is not parallel to the relative linear movement direction. Specifically, the first raceway surface 3f has a deformed raceway surface 3k in which a cross section in the moving direction of the relative linear movement (that is, an axial cross section in FIG. 1) is a curved surface having a concave curve.
Similarly, the second raceway surface 5f provided on the second member 5 has a shape whose cross section in the relative linear movement direction (that is, the axial direction) is not parallel to the relative linear movement direction. Specifically, the second raceway surface 5f has a deformed raceway surface 5k in which the cross section in the moving direction of the relative linear movement (that is, the axial cross section in FIG. 1) is a curved surface having a concave curve. Therefore, with the relative linear movement between the first member 3 and the second member 5, the holding interval of the cylindrical roller 6 interposed between the deformed raceway surface 3k and the deformed raceway surface 5k is the first member 3 and the second member. It changes according to the relative positional relationship with 5.

  The deformed raceway surface 3k of the first raceway surface 3f has a predetermined curvature in the axial section, but this curvature is constant. On the other hand, the deformed raceway surface 3k is a surface having no curvature in a cross section perpendicular to the axial direction (FIG. 2). That is, the deformed raceway surface 3k is a circumferential surface. This also applies to the deformed raceway surface 5k. That is, the deformed raceway surface 5k of the second raceway surface 5f has a predetermined curvature in the axial cross section, but this curvature is constant, and the deformed track surface 5k is a cross section perpendicular to the axial direction (see FIG. In 2), it is a circumferential surface having no curvature. By making the deformed raceway surfaces 3k and 5k circumferential surfaces, it is easier to design and process the deformed raceway surfaces than in the case of a free-form surface or the like.

In the first raceway surface 3f, the irregular raceway surface 3k is provided continuously in the axis z direction. That is, the deformed raceway surface 3k is continuously provided on one axial end side (opening side of the first member 3) and the other axial end side (bottom 3b side of the first member 3). Therefore, the range in the axial direction of each deformed raceway surface 3k is ensured to the maximum, which contributes to the expansion of the relative movement range in which the urging force can be obtained.
Similarly, in the second raceway surface 5f, the irregular raceway surface 5k is provided continuously in the axis z direction. That is, the deformed raceway surface 5k is continuously provided on one axial end side (opening side of the first member 3) and the other axial end side (bottom 3b side of the first member 3). Therefore, the range in the axial direction of each deformed raceway surface 5k is ensured to the maximum, which contributes to the expansion of the relative movement range in which the urging force can be obtained.

  The irregular raceway surface 3k and the variant raceway surface 5k have the same curvature in the axial cross section. In the initial state shown in FIG. 1, the axial range of the deformed track surface 3k is the same as the axial range of the deformed track surface 5k facing the deformed track surface 3k. This point also contributes to the expansion of the relative movement range where the urging force can be obtained. The initial state means a state in which no urging force is acting between the first member 3 and the second member 5. In the axial cross section of FIG. 1, a tangent line (not shown) at the deepest position 3m of the deformed raceway surface 3k is parallel to the axis z. Similarly, the tangent at the deepest position 5m of the deformed raceway surface 5k is parallel to the axis z. In the sectional view of the initial state of FIG. 1, the center of curvature (not shown) of the deformed track surface 3k and the deformed track surface 5k is a straight line connecting the deepest position 3m on the deformed track surface 3k and the deepest position 5m on the deformed track surface 5k. s (see FIG. 1).

As can be seen from FIGS. 1 and 2, the urging device 1 of the present embodiment has eight deformed track surfaces 3k and eight deformed track surfaces 5k.
That is, as shown in FIG. 2, the deformed raceway surface 3k is provided on each of the four inner surfaces of the outer portion 3a having a substantially square cross section. In other words, the deformed raceway surface 3k is equally arranged around the axis z. Similarly, the deformed raceway surface 5k is provided on each of the four outer surfaces of the inner portion 5a having a substantially square cross section. In other words, the deformed raceway surface 5k is equally arranged around the axis z. Further, as described above, each of the deformed track surface 3k and the deformed track surface 5k is continuously provided on one end side and the other end side in the axial direction, so that the deformed track surface 3k and the deformed track surface 5k are summed up respectively. Eight are provided, and in the initial state, eight sets of deformed raceway surfaces 3k and deformed track surfaces 5k are formed. And one rolling element (cylindrical roller 6) is arrange | positioned with respect to a set of deformed track surface 3k and deformed track surface 5k. Therefore, the urging device 1 has a total of eight cylindrical rollers 6. Therefore, a first row cylindrical roller 61 arranged on one axial end side and composed of four cylindrical rollers 6 and a second row cylindrical roller 62 composed of four cylindrical rollers 6 arranged on the other axial end side are: These are equally arranged around the axis (every 90 degrees).

  In the urging device 1 configured as described above, the deformed raceway surface 3k and the deformed raceway surface 5k move while the cylindrical roller 6 rolls along with the relative linear movement between the first raceway surface 3f and the second raceway surface 5f. The clamping interval of the cylindrical rollers 6 is gradually narrowed, and the biasing force in the direction to cancel the relative displacement between the first raceway surface 3f and the second raceway surface 5f caused by the relative linear movement is applied to the first member 3 and the second member. It is given between the two members 5. Hereinafter, this point will be described in detail.

  FIG. 4A is an enlarged cross-sectional view of the vicinity of one cylindrical roller 6 in the biasing device 1 in the initial state shown in FIG. In this initial state, the axial position of the deepest position 3m on the deformed track surface 3k and the deepest position 5m on the deformed track surface 5k are the same. The cylindrical roller 6 is in contact with the deepest position 3 m and the deepest position 5 m. As described above, the holding interval of the cylindrical rollers 6 changes as the first member 3 and the second member 5 move relative to each other, but this holding interval is the largest in the initial state. Therefore, in this initial state, the compressive stress acting on the cylindrical roller 6 from the deformed raceway surfaces 3k and 5k is minimum (for example, zero). In this initial state, the distance between the deepest position 3m on the deformed raceway surface 3k and the deepest position 5m on the deformed raceway surface 5k is substantially the same as the diameter of the cylindrical roller 6, and each of the raceway surfaces 3k, 5k and the cylindrical roller. The gap between the gaps 6 and 6 is almost zero. For example, a gap (plus gap or minus gap) of about -0.03 mm to 0.03 mm may be provided.

When the first member 3 and the second member 5 are moved relatively linearly from the initial state, the cylindrical roller 6 moves while rolling along with the relative linear movement. Due to this rolling, the contact position between the cylindrical roller 6 and both raceway surfaces 3k and 5k deviates from the deepest positions 3m and 5m, and the holding interval of the cylindrical roller 6 becomes gradually narrower than the initial state.
Here, an external force in the axial direction is applied to the second member 5 with the first member 3 fixed, and the members 3 and 5 are relatively displaced in the axial direction by a distance x from the initial state shown in FIG. Then, a state (shown in FIG. 4B) where the external force and the urging force of the urging device 1 are balanced and stationary is considered. In the state of FIG. 4B in which relative displacement is performed by the distance x, the holding interval of the cylindrical rollers 6 is narrower than the diameter of the cylindrical rollers 6. Accordingly, the cylindrical roller 6 is elastically deformed by receiving the vertical forces F1 and F2 from the centers G1 and G2 of the contact positions with the raceway surfaces 3k and 5k. On the other hand, the first member 3 and the second member 5 receive vertical forces F1 ′ and F2 ′ as reaction of the vertical forces F1 and F2. Here, the vertical force F1 ′ has a component perpendicular to the axial direction (upward in FIG. 4B) and an axial component toward the one end side in the axial direction (rightward in FIG. 4B). ing. On the other hand, the vertical force F2 ′ has a component perpendicular to the axial direction (downward in FIG. 4B) and an axial component toward the other end in the axial direction (leftward in FIG. 4B). ing. Thus, the normal force F1 ′ acting on the first member 3 from the cylindrical roller 6 has an axial component toward the one end side in the axial direction, and this axial component is the first member 3 and the second member 5. The biasing force is in the direction to cancel the relative displacement.

  In FIG. 4B, the second member 5 is described as being moved to the one end side in the axial direction with respect to the first member 3, but the second member 5 is moved to the other end in the axial direction with respect to the first member 3. Also when moved to the side, as in the above description, an urging force in the direction to cancel the relative displacement between the first member 3 and the second member 5 (the direction opposite to the case of FIG. 4B) is obtained. It is done. Therefore, the biasing device 1 is a biasing device that functions as a compression spring and also functions as an extension spring.

  Since the cylindrical roller 6 and the deformed raceway surfaces 3k, 5k are equally arranged around the axis, the direction perpendicular to the axis acting on each member (the cylindrical roller 6, the first member 3, and the second member 5) is set. The force is canceled regardless of the relative displacement between the first member 3 and the second member 5. Therefore, the first member 3 and the second member 5 can move relative to each other in the axial direction.

  As described above, the deformed track surface 3k and the deformed track surface 5k are concave curved surfaces, and the deformed track surfaces 3k and 5k form a smoothly continuous curved surface. Therefore, as long as the contact position between the cylindrical roller 6 and the raceway surfaces 3f and 5f does not reach the boundary positions 3b and 5b between the adjacent raceway surfaces, the cylindrical roller associated with the relative displacement between the first member 3 and the second member 5. The clamping interval of 6 changes gradually (gradually). Then, as described above, a biasing force in a direction to cancel the relative displacement between the both members 3 and 5 caused by the relative movement between the first member 3 and the second member 5 is applied between the both members 3 and 5. . Therefore, this urging device 1 replaces a conventional compression coil spring or extension coil spring. That is, it can be used for applications in which spring elasticity is imparted between members that relatively move in the linear direction.

According to the urging device 1, an urging function (hereinafter also referred to as spring property) can be provided with a simple configuration without using a coil spring or the like. Accordingly, it is possible to suppress deterioration due to continuous use or change with time as compared with the conventional urging member, and it is possible to extend the life.
Further, unlike conventional urging members, there is no need for peripheral members such as a second member that moves relative to each other and a joining portion that joins the first member and the urging member. Therefore, the peripheral structure can be simplified, the number of parts and the assembly cost can be suppressed, the reliability can be improved, and the member can be easily downsized.

The biasing device 1 is a member that also has a function of supporting a load between the first member 3 and the second member 5 (a load in a direction in which the cylindrical roller 6 is compressed).
Further, the urging device 1 can support the moment load acting between the first member 3 and the second member 5 by the cylindrical roller 6. That is, the urging device 1 has a double row structure having four first row cylindrical rollers 61 arranged on one axial end side and four second row cylindrical rollers 62 arranged on the other axial end side. Therefore, the moment load can be supported. Furthermore, in the urging device 1, as shown in FIG. 2, cylindrical rollers 6 interposed between the inner part 5a and the outer part 3a are provided on the four sides of the inner part 5a, so that moment loads in all directions are supported. The urging device 1 can be used. Note that the present invention is not limited to the case where the cylindrical rollers 6 are arranged in two rows as described above, and may be one row or three or more rows.

  Further, in the urging device 1, the degree of freedom in design such as spring rigidity is extremely high as compared with the conventional urging member. That is, since the spring rigidity and the like can be freely designed by designing the irregular raceway surface (curvature, position of the center of curvature, etc.) and the rigidity of each constituent member (cylindrical roller 6, first member 3, second member 5), etc. Design flexibility is extremely high. Therefore, characteristics such as spring rigidity can be set over a wide range without changing the size (physique) of the member. Further, in the conventional coil spring, the relationship between the relative displacement and the spring stiffness is linear (constant), but in the biasing device 1, the spring stiffness is changed non-linearly with respect to the relative displacement. The spring stiffness can be changed freely.

  In the urging device 1, the holding interval of the cylindrical rollers 6 that are rolling elements is configured to change uniformly in all the cylindrical rollers 6 as the members 3 and 5 move relative to each other. If it does in this way, the urging | biasing force which acts on the members 3 and 5 from each rolling element will become equal, and spring property can be obtained efficiently. Moreover, since the load with respect to each cylindrical roller 6 becomes equal, it becomes a long life.

The relative linear movement possible range (possible stroke) in the biasing device of the present invention is the design of the deformed raceway surfaces 3k and 5k, the elastic deformation range of the rolling elements 6 and the members 3 and 5, and the installation range of the deformed track surfaces 3k and 5k. Etc. If there is no restriction on the force for relative displacement of the first member 3 and the second member 5 (hereinafter also referred to as relative displacement force), the urging device of the present invention usually has the following (i) to ( C) A relative straight line movement is possible until either state is reached.
(A) Each member 3, 5 or cylindrical roller 6 reaches the limit of the elastic deformation range.
(B) The cylindrical roller 6 comes off the raceway surfaces 3f and 5f and falls off the urging device 1.
(C) The relative displacement is restricted by the first member 3 and the second member 5 interfering with each other.
Therefore, depending on the design of the raceway surfaces 3f and 5f and the deformed raceway surfaces 3k and 5k, the cylindrical roller 6 can be moved to the adjacent variant raceway surface by the relative linear movement of the first member 3 and the second member 5. It is. In the biasing device 1 (see FIG. 1) described above, when the relative displacement between the first member 3 and the second member 5 is increased, the first member 3 and the second member 5 interfere with each other, or the cylindrical roller 6 falls off. Therefore, the cylindrical roller 6 does not move over the boundary positions 3b and 5b to the adjacent deformed raceway surfaces 3k and 5k. For example, in the urging device 1, a spare (the cylindrical roller 6 is not disposed). ) By providing a large number of irregularly shaped raceway surfaces 3k and 5k in the axial direction, a configuration in which the cylindrical roller 6 can move to the adjacent irregularly shaped raceway surface is possible. In this case, a certain limit value can be set for the relative displacement force acting between the first member 3 and the second member 5. Therefore, in the urging device of the present invention, a function of preventing an excessive relative displacement force from acting between the first member 3 and the second member 5 can be added.

  In the present invention, the shape or the like of the rolling element is not particularly limited as long as it rolls with relative linear movement between the first member and the second member. Therefore, it is not restricted to a cylindrical roller like embodiment mentioned above, For example, a ball | bowl, a tapered roller, etc. may be sufficient and what was used with the conventional rolling bearing can be applied suitably. Further, in order to increase the degree of freedom in setting the spring rigidity, a hollow rolling element (for example, a hollow cylindrical roller or a hollow sphere) that easily undergoes elastic compression deformation can be used. Further, the material of the rolling element is appropriately selected according to the performance required for the urging device.

As described above, the urging force obtained by the urging device of the present invention is mainly based on the local elastic deformation in the contact region between the first member and the second member and the rolling element during the relative movement of the rolling element. Can be explained. However, macroscopic elastic deformation of the first member and / or the second member may be increased by reducing the thickness of the first member or the second member. Furthermore, it is good also as a structure which obtains urging | biasing force mainly by elastically deforming a 1st member or a 2nd member, without a rolling element elastically deforming. By adding the rigidity of the first member or the second member as a design element, the design freedom of the present invention is further improved.
By changing the thickness (average thickness), thickness distribution, or material of the first member or the second member, the rigidity of the first member or the second member 5 (the rigidity against the pressing force by the rolling elements) is changed. Can do. For example, the outer surface of the first member 3 of the biasing device 1 described above can be provided with irregularities, or the second member 5 can be made hollow.

As a modification of the present invention, the following urging device is also possible.
For example, the urging device 1 may have a configuration in which the bottom portion 3b is removed (that is, a configuration in which the first member 3 includes only the outer portion 3a). In the urging device 1, the inner portion 5a is disposed inside the tubular outer portion 3a. However, the configuration may not be such. For example, like the biasing device 70 of the modified example shown in FIG. 5, the first member 3 has a substantially cross-sectional shape having two substantially plate-like parts 3 c facing each other and a connecting part 3 d for connecting them on one side. The structure which the inner part 5a of the 2nd member 5 is arrange | positioned between these two substantially plate-shaped parts 3c may be sufficient. 5A is a sectional view in the axial direction of the urging device 70, and FIG. 5B is a sectional view of the urging device 70 along the line CC in FIG. 5A.

  In the urging device 1, the cross-sectional shapes of the first raceway surface 3f and the second raceway surface 5f are substantially square. For example, the cross-sectional shapes of these raceway surfaces 3f and 5f are regular triangles such as a regular triangle and a regular pentagon. It is good also as a structure which makes it an n-gon (n is an integer greater than or equal to 3), and provides a deformed track surface on each of the component surfaces corresponding to each side forming these cross-sectional polygons. In this way, the first raceway surface 3f, the second raceway surface 5f, and the rolling elements can be equally arranged around the axis.

  In the urging device 1, all of the first raceway surface 3f is occupied by the irregular raceway surface 3k, but a part of the first raceway surface 3f may be the variant raceway surface 3k. Similarly, in the urging device 1, all of the second raceway surface 5f is occupied by the irregular raceway surface 5k. However, a part of the second raceway surface 5f may be the variant raceway surface 5k.

  Further, as an example of a configuration different from the biasing device 1, the following biasing device may be used. The first member and the second member are plate-like members facing each other through the rolling elements, and the opposing surfaces of both members are the first raceway surface and the second raceway surface, respectively. A configuration in which at least one of the second raceway surfaces has the deformed raceway surface may be employed. In this case, a support portion that supports the first member and the second member so as to be capable of relative linear movement is required.

  Further, in the urging device 1, the urging force is obtained only in the relative movement direction (relative translational movement direction), but the urging device 1 is further rotated with respect to the relative rotation (twist) of the first member 3 and the second member 5. You can also give power. In the deformed raceway surfaces 3k and 5k of the above embodiment, a curvature is given to the relative linear movement direction (axial direction) of the first member 3 and the second member 5, and in the direction orthogonal to the relative linear movement direction, The curvature was not given. However, for example, in the deformed raceway surface 3k and the deformed raceway surface 5k, in addition to the relative linear movement direction, a curvature in a direction orthogonal to the relative linear movement direction is given, so that the first member 3 and the second member 5 are relative to each other. It is good also as a deformed track surface which gives between the 1st member 3 and the 2nd member 5 the rotation energizing force of the direction which cancels the phase difference between said 1st member and 2nd member which arose by rotation. In this case, it is possible to provide a rotation urging function (torsion spring property) between the first member 3 and the second member 5 by using a rolling element as a ball.

It is sectional drawing (sectional drawing containing an axis | shaft) of the urging | biasing apparatus which is 1st embodiment of this invention. It is sectional drawing of the urging | biasing apparatus of 1st embodiment in the AA line of FIG. It is sectional drawing of the urging | biasing apparatus of 1st embodiment in the BB line of FIG. It is a figure for demonstrating the principle which spring property generate | occur | produces in the urging | biasing apparatus of FIG. It is sectional drawing of the urging | biasing apparatus of a modification.

Explanation of symbols

1 urging device 3f first raceway surface 3k deformed raceway surface 3 first member 5f second raceway surface 5k deformed raceway surface 5 second member 6 cylindrical roller (rolling element)
70 Biasing device

Claims (3)

A first member having a first raceway surface;
A second member having a second raceway surface facing the first raceway surface and capable of relative linear movement with the first member;
A rolling element interposed between the first raceway surface and the second raceway surface in a rollable manner;
At least one of the first raceway surface and the second raceway surface gradually narrows the holding interval of the rolling element while rolling the rolling element with relative linear movement of the first member and the second member, It has a deformed raceway surface that imparts a biasing force between the first member and the second member generated by relative linear movement in a direction to cancel the relative displacement between the members. Energizing device to do.   2. The biasing device according to claim 1, wherein the deformed raceway surface forms a curved surface having a concave curve in a cross-section in the movement direction of the relative linear movement. The first member having a tubular outer portion and the inner surface of the outer portion being the first raceway surface;
The second member having an inner part arranged coaxially with the outer part and inside the outer part, and the outer surface of the inner part being the second raceway surface,
The deformed raceway surface provided on at least one of the inner surface of the outer portion and the outer surface of the inner portion,
The first raceway surface, the second raceway surface and the rolling elements are equally arranged around an axis,
The urging device according to claim 1, wherein the outer portion and the inner portion are capable of relative linear movement in the axial direction while maintaining a coaxial state.

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