THK Co.

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Patent
Thk Co. | Date: 2017-03-01

A motion apparatus includes end plates (41) that are attached to end faces (22) of a block (21) in directions of movement and form rolling element veering paths as parts of an endless cyclic path, wherein the end plate (41) has a scooping piece (56) that is provided so as to protrude toward the block (21), the scooping piece (56) comprising a slit (56v) that is gradually narrowed toward a side opposite to the side to which the scooping piece (56) protrudes, and wherein the block (21) has scooping piece container portions (36) that cover the scooping pieces (56).


Patent
THK Co. | Date: 2017-05-31

A roller guide device wherein a roller 1 is interposed between a guide surface C1 of a first guide member 210, which takes an arcuate convex shape, and a guide surface C2 of a second guide member 220, which takes an arcuate concave shape and is in opposition to the guide surface C1.The guide surface C1 of the first guide member 210 and the guide surface C2 of the second guide member 220 have the same center of curvature O, and are located on concentric circles.The roller 1 is provided with a central concave surface portion 3 of which a cross sectional configuration cut by a surface passing through a roller central axis N is an arcuate concave shape, and which is in contact with the convex shaped guide surface C1 of the first guide member 210; and end convex surface portions 5, 5 which continue to the axially opposite sides of the central concave surface portion 3, and of which a cross sectional configuration cut by a surface passing through the roller central axis N is an arcuate convex shape, and which is in contact with the concave shaped guide surface C2 of the second guide member 220.


Patent
THK Co. and Denki Kogyo Co. | Date: 2017-01-18

A heat-treatment device 10 includes a table 11 on which a ring-shaped workpiece W can be placed, and a pair of heat processing units 20 for heat-processing the peripheral surface of the workpiece W. The heat-treatment device 10 is used for obtaining the workpiece W having desired properties by the heat-processing the workpiece W while the pair of heat processing units 20 move in opposite directions along the peripheral surface of the workpiece W. The heat-treatment device 10 is configured in such a way that a pair of revolving arms 30 movable relative to the table 11 oscillate the pair of heat processing units 20 relative to the workpiece W, thereby heat-processing the peripheral surface of the workpiece W. By adopting such a configuration, it is possible to obtain a heat-treatment device heat-processing the entire circumference of a ring-shaped workpiece.


Patent
THK Co. | Date: 2017-03-22

Provided is a ball joint that is less affected by fluctuations in environmental temperature, and is capable of stabilizing a torque value required to rock a ball stud in a holder. The ball joint includes: a ball stud (1) including: a shaft member (11); and a ball portion (10) formed at one end of the shaft member (11); and a holder (2) made of a synthetic resin and configured to accommodate the ball portion in a pivotable manner. The holder (2) includes: an opening portion (30) from which the shaft member protrudes; a first member (20) including a first ball sliding contact surface (24) having a concave spherical shape approximate to a spherical surface of the ball portion; and a second member (3) including: a second ball sliding contact surface (31) having a concave spherical shape approximate to the spherical surface of the ball portion; and the opening portion (30) formed in a center of the second ball sliding contact surface. Further, the first member (20) and the second member (3) respectively include joining surfaces (25, 32) fixed to each other by welding, and respectively include fixation reference surfaces (28, 34) that are brought into abutment against each other.


Patent
Thk Co. | Date: 2017-03-22

A movement device includes: a track body; and a moving body which includes: a plurality of endless circulation passages; and a roller configured to roll in the plurality of endless circulation passages, the moving body being movable relative to the track body via the roller disposed between the track body and the moving body, The moving body further includes: a moving body main body in which inner peripheral portions of roller direction-change passages configuring the adjacent endless circulation passages are formed to be adjacent to each other on an end surface in a movement direction in which the moving body moves; and a cover body which is attached to the end surface of the moving body main body and in which outer peripheral portions of roller direction-change passages configuring the adjacent endless circulation passages arc formed to be adjacent to each other. The moving body main body and the cover body are positioned by engaging a positioning portion provided between the adjacent inner peripheral portions of the moving body main body with a positioning portion between the adjacent outer peripheral portions of the cover body.


Patent
THK Co. | Date: 2017-06-14

A double-row roller bearing is configured so that an outer ring (1) and an inner ring (2) are capable of smoothly rotating relative to each other while an increase in frictional force caused by a variation in the contact-pressure force between the inner and outer rings (1,2) and rollers (3) is minimized, and so that the double-row roller bearing is adapted to be reduced in size and is highly versatile. The double-row roller bearing, comprises an inner ring (2); an outer ring (1); and a plurality of roffers (3) arranged between the inner ring (2) and the outer ring (1), wherein a central clearance (50) is arranged on an inner side in a radial direction of the inner ring (2) with respect to a lateral clearances (51), wherein the outer peripheral surface of the inner ring (2), which faces the central clearance (50), comprises a pair of lubricant transfer surfaces (41) being inclined with respect to the rotation axis of the inner ring (2) and being continuous with the pair of second rolling surfaces (28b), and wherein the outer ring (1) has a supply hole (4) configured to allow lubricant to be supplied into the central clearance (50).


Patent
THK Co. | Date: 2016-03-30

Provided is a double-row roller bearing, which is capable of suppressing a frictional force from being increased due to variation in force of press contact between outer and inner rings (1, 2) and rollers (3) to enable smoother relative rotational movement between the outer ring (1) and the inner ring (2), and is also suitable for downsizing and higher in versatility. The double-row roller bearing includes: the inner ring (2); the outer ring (1); and the plurality of rollers (3) arranged between the inner ring (2) and the outer ring (1). On an inner peripheral surface (11) of the outer ring (1), a pair of lateral protruding portions (12) continuous along a circumferential direction are formed at an interval in a direction of a rotation axis. On an outer peripheral surface (21) of the inner ring (2), an intermediate protruding portion (22) continuous along the circumferential direction is formed so as to be positioned between the lateral protruding portions (12). The pair of lateral protruding portions (12) and the intermediate protruding portion (22) define a pair of roller rolling passages (30) between the outer ring (1) and the inner ring (2). In each of the pair of roller rolling passages (30), rollers (3a) each having a turning axis perpendicular to the rotation axis of the outer ring (1) and the inner ring (2), and rollers (3b) each having a turning axis parallel to the rotation axis of the outer ring (1) and the inner ring (2) are arranged in a mixed manner.


This rotation-linear motion conversion apparatus (10) includes: a pinion shaft (20) in which a pinion gear (22) is formed; a rack bar (30) in which a rack gear (32) that engages with the pinion gear (22) and a support surface (31) along a longitudinal direction are formed; and a support part (40) that supports the rack bar (30) movably along the support surface (31). The support part (40) prevents a movement of the rack bar (30) in a direction X perpendicular to a surface (30a) in which the rack gear (32) is formed.


Patent
THK Co. | Date: 2016-08-03

Provided is a moving unit (1) capable of easily mounting and dismounting a movable body (41) to and from track rails (2A, 2B). The moving unit (1) includes the pair of track rails (2A, 2B), which are laid on a fixed portion at an interval therebetween, and respectively have guiding surfaces on surfaces opposed to each other, a plurality of moving blocks (3A, 3B), which are accommodated and arranged in an accommodating space sandwiched between the pair of track rails (2A, 2B), and are configured to travel on the guiding surfaces of the respective track rails (2A, 2B), and the movable body (41), which is arranged so as to be opposed to the fixed portion across the accommodating space, and is retained by the moving blocks (3A, 3B). The movable body (41) includes a mounting and dismounting mechanism, which is configured to change the interval between the moving block (3A, 3B) to be assembled to one of the track rails (2A, 2B) and the moving block (3A, 3B) to be assembled to another one of the track rails (2A, 2B) to cancel a contact state between the moving blocks (3A, 3B) and the respective track rails (2A, 2B) . The mounting and dismounting mechanism is accommodated together with the moving blocks (3A, 3B) in the accommodating space.


Patent
THK Co. | Date: 2016-01-27

Provided is a support and guide device capable of smoothly shifting a moving block (2) configured to move along a guide track (1) from one of a plurality of track rails (4) forming the guide track (1) to another of the plurality of track rails (4) even when clearances are secured at joints between the plurality of track rails (4). The plurality of track rails (4) are arranged in series, and the moving block (2) is movable along the guide track (1) while being sequentially shifted between the plurality of track rails (4). Each of the track rails (4) has a guide surface (41) formed along a longitudinal direction of each of track rails (4). The moving block (2) includes contact elements (3) configured to travel on the guide surface (41) of the track rail (4). Each of the track rails (4) has auxiliary sliding surfaces (5) formed on both end portions of the each of the plurality of track rails (4) in the longitudinal direction, the auxiliary sliding surfaces (5) being formed side by side with the guide surface (41) and being inclined with respect to the guide surface (41). The moving block (2) includes leading sliding portions (9) each being configured to face one of the auxiliary sliding surfaces (5) of the track rail (4) when the moving block (2) reaches one of both end portions of the track rail (4) in the longitudinal direction.

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