TWI452212B - Linear guide device - Google Patents

Description

Linear guide

The present invention relates to a linear guide device that combines a sliding member with a guide shaft by performing a plurality of balls in an infinite loop so that a load fixed to the sliding member can reciprocate along a guide shaft; in particular, regarding a ball The infinite circulation path is a linear guide device which is formed in a simple structure of the sliding member so as to guide the track groove of the shaft.

In the workpiece table of the working machine and the linear guides of various conveying devices, a linear guide that continuously moves the sliding member (a movable body on which the stage or the like is mounted) along the guide shaft is often used. In the linear guide device, the sliding member is assembled to the guide shaft through a plurality of balls, and the balls are rolled in a state where the load is loaded between the sliding member and the guide shaft, so that the movable body mounted on the sliding member can be driven. Easily move along the guide axis with very little resistance. Further, the sliding member is provided with an infinite circulation path of the balls, and the balls are circulated in the infinite circulation path, whereby the sliding member can be continuously moved along the guide shaft.

Conventionally, as the mainstream of the sliding member, it is composed of a metal block body and an end cap made of a synthetic resin bonded to both ends of the block body. In the block body, a load rolling groove is formed in which the ball rotates under a load load between the ball rolling groove of the guide shaft, and an unloaded ball passage parallel to the load rolling groove is formed, and In order to suppress the time-consuming wear of the ball rolling, the block body is formed, for example, of quenchable steel. Before again The end cap is formed with a direction changing path, and in order to realize a complicated shape, the end cap is formed by injection molding of a synthetic resin. By fixing a pair of end caps correctly to the front and rear end faces of the block body, the end portion of the load rolling path and the end portion of the unloaded ball passage are connected by a direction changing path to form an infinite loop having balls. The sliding member of the road.

On the other hand, a linear guide device which simplifies the structure of the sliding member is disclosed in WO2006/022242-A1. The linear guide device, which is an infinite circulation path of the balls, forms a track groove in the sliding member, and the track groove is a groove that faces the opening of the guide shaft. The track groove system includes: a load linear groove for rolling the ball under load load between the ball rolling groove of the guide shaft, and a ball deflection groove respectively disposed at one of opposite ends of the load linear groove ( The rolling direction of the ball rolling in the load straight groove is changed to separate the ball from the ball rolling groove of the guide shaft, and the ball in the unloaded state is transferred from one ball to the groove to the other ball deflecting groove. No load linear groove. The track groove is formed at a position opposed to the guide shaft of the sliding member, whereby the balls that are rolled in the unloaded state inside the ball deflecting groove and the unloaded linear groove are prevented from coming off the track groove.

Patent Document 1: WO2006/022242-A1

However, the linear guide device disclosed in WO2006/022242-A1 simplifies the structure of the infinite circulation path in which the sliding member is provided with the ball, but the ball is held in the aforementioned track groove by contact with the guide shaft. If the sliding member is removed from the guide shaft, the balls arranged in the track groove will The sliding member is rolled down to cause a problem. Therefore, the guide shaft and the slide member cannot be separated, and when the slide member must be separated from the guide shaft for transport, the slide member must be moved from the guide shaft to the temporary shaft for conveyance, which is quite troublesome.

The present invention has been developed in view of the above problems, and an object thereof is to provide a linear guide device excellent in operability, which can provide a sliding member with an infinite circulation path of a ball with a simple structure, and even a sliding member and a guide. It is still possible to prevent the balls from falling off from the sliding member after the shaft is separated.

The linear guide device according to the present invention for achieving the above-described object includes: a plurality of balls, a guide shaft of a rolling groove in which a plurality of the balls are arranged in a long direction, and a track for circulating the ball so as to face the guide shaft The groove and the sliding member movable along the guide shaft along with the circulation of the balls. The rail groove includes a load passage portion that is disposed to face the rolling groove of the guide shaft and that causes the ball to roll in a load load state, is disposed in parallel with the load passage portion, and allows the ball to be unloaded The unloaded passage portion that is rolled in the state, and the direction change passage portion that connects the load passage portion and the unloaded passage portion to allow the balls to travel one to the other. The opening width toward the guide shaft is set to be smaller than the diameter of the ball over the entire circumference of the track groove.

According to the linear guiding device of the present invention, the track groove is provided on the sliding member in a plane guiding manner to form a groove opening toward the guide shaft, and the opening width is set to be larger than the entire circumference of the track groove. The diameter of the ball is smaller, so that the ball does not fall off the track groove even after the sliding member and the guide shaft are separated. Therefore, it is not necessary to use a temporary shaft for transportation, for example, to guide the guide shaft. Separating from the sliding member makes it easy to operate the linear guide using the track groove for the infinite circulation of the balls.

In the present invention, in consideration of productivity in producing the sliding member, the sliding member preferably includes a sliding member base including the load passage portion and the unloaded passage portion, and includes the direction changing passage portion and is fixed to the sliding member. An end plate of one of the opposite ends of the base. The sliding member can also be formed of a single metal block, and the track block can be formed by cutting, grinding, electric discharge machining or the like. However, since the track groove has to be set to have a smaller opening width toward the guide shaft than the diameter of the ball over its entire circumference, the machining is laborious and laborious in the case of using a machining method such as cutting or grinding. There is a flaw in productivity.

In this regard, as described above, when the sliding member is divided into the sliding member base portion and the end plate, the load passage portion and the unloaded passage portion of the sliding member base portion form a linear passage in the track groove. Therefore, the sliding member base has the same cross-sectional shape in the axial direction of the guide shaft. Therefore, the sliding member base portion can be produced by wire-cut electrical discharge machining, drawing processing, forging processing, or the like, and the sliding member base portion can include the load passage portion and the unloaded passage portion, and can be easily produced by the above-described processing method. The opening width is set to be smaller than the ball diameter and the load passage portion and the no-load passage portion.

On the other hand, although the direction change passage portion of the end plate is a curved passage, since the balls are rolled in the load-free state in the direction change passage portion, the end plate can be formed by using a mold (synthesis) Produced by injection molding of a resin, etc., and productivity can be improved.

As a method of providing the end plate with the direction changing passage portion (the opening width toward the guide shaft is smaller than the ball diameter), the end plate can be divided into two members and combined to form a direction in which the opening width is restricted. Conversion path section. However, from the viewpoint of making the end plate more simply, it is preferable that the opening edge of the groove formed in the end plate and the sliding member are used as the direction changing passage portion when the end plate is fixed to the end surface of the base portion of the sliding member. The end faces of the base portion face each other, and an opening width smaller than the ball diameter is formed in the direction changing passage portion by the cooperation of the two.

Hereinafter, the linear guide device of the present invention will be described in detail with reference to the drawings.

Figs. 1 and 2 show a first embodiment in which the present invention is applied to a ball stud device (a type of linear guide device). The ball stud groove device includes a pin groove shaft 1 having a substantially cylindrical cross section, and a nut member 2 which is formed in a substantially cylindrical shape and is assembled to the pinch shaft 1 through a plurality of balls 3. The nut member 2 is reciprocally movable around the bolt shaft 1 in the axial direction. The pinch shaft 1 corresponds to a guide shaft of the present invention, and the nut member 3 corresponds to a sliding member of the present invention. Further, the nut member 2 includes a metal nut body 4 and an end plate 5 that is bolted to one of the opposite ends of the nut body 4 in the axial direction. The nut body 4 corresponds to the base of the sliding member of the present invention. In addition, in the first figure, in order to show the internal structure of the nut member, the state in which one end plate is removed from the nut body is shown.

On the outer circumferential surface of the aforementioned groove shaft 1, four aforementioned directions are formed along the axial direction The ball 3 is rolled into the groove 10, and the ball 3 is loaded between the nut member 2 and the pinch shaft 1 in a state of being rolled along the rolling grooves 10. The shape of the cross section perpendicular to the longitudinal direction of each of the rolling grooves 10 is an arc shape, that is, a shape formed by a single arc having a curvature slightly larger than the curvature of the ball spherical surface. The rolling groove 10 includes a rolling groove 10a for loading the load when the nut member 2 is rotated around the tip axis 1 in the direction of the arrow A, and a groove for the nut member 2 in the direction of the arrow B. When the circumference of the shaft 1 is rotated, the load-bearing rolling groove 10b is formed, and the adjacent rolling groove 10a and the rolling groove 10b are grooves. Therefore, a plurality of grooves are formed at equal intervals on the outer circumferential surface of the bolt shaft 1. Groove. Thereby, the transmission of torque can be performed between the nut member 2 and the pinch shaft 1. In the ball-and-groove device shown in Figs. 1 and 2, the rolling groove 10 having four grooves is formed on the outer circumferential surface of the pinch shaft 1, but three grooves or four grooves can be formed. The groove 8 is rolled into the groove 10.

On the other hand, the nut body 4 and the end plate 5 constituting the nut member 2 each have a through hole through which the bolt shaft 1 is inserted. Further, a key groove is formed on the outer circumferential surface of the nut body 4, and the nut member 2 can be used when it is attached to a mechanical device.

The nut member 2 combined with the nut body 4 and the pair of end plates 5 has a track groove 30 as an infinite circulation path of the balls 3 on the inner circumferential surface of the through hole facing the pinch shaft 1. The rail groove 30 includes a load passage portion 31 formed on the inner circumferential surface of the nut body 4 so as to face the rolling groove 10 of the bolt shaft 1, and is spaced apart from the load passage portion 31 by a slight interval. The unloaded passage portion 32 formed on the inner circumferential surface of the nut body 4 and the roller between the load passage portion 31 and the unloaded passage portion 32 The feed direction is converted by 180 degrees, and the ball 3 is moved to and from the direction change passage portion 33 between the grooves. The direction change passage portion 33 is formed in the end plate 5.

Fig. 3 is a cross-sectional view showing the load passage portion 31 and the unloaded passage portion of the track groove 30 in detail. The load passage portion 31 and the unloaded passage portion 32 are substantially cylindrical straight passages having an inner diameter slightly smaller than the diameter of the balls 3, and include slit-shaped openings that open toward the plug shaft 1. Inside the load passage portion 31, a load rolling groove 31a is formed at a position facing the rolling groove 10 of the bolt shaft. The balls are in contact with both the load rolling groove 31a and the rolling groove 10 of the bolt shaft 1, and are rolled in the inside of the load passage portion 31 with a load load therebetween. The load rolling groove 31a has a cross section perpendicular to the longitudinal direction thereof and is formed in an arc shape similarly to the rolling groove 10 of the bolt shaft 1. Since four rolling grooves 10 are formed in the pinch shaft 1, the balls 3 and the respective rolling grooves 10 of the bolt shaft 1 or the respective load rolling grooves 31a of the nut member 2 are in contact with each other in the groove shaft 1 The circumferential directions are deviated by 90 degrees from each other. Thereby, the nut member 2 can reciprocate along the pinch shaft 1 in a state in which the load acts on various loads other than the axial direction of the pinch shaft 1.

Further, as will be described in detail below, the direction changing passage portion 33 is also opened toward the pinch shaft 1. Therefore, the track groove 30 composed of the load passage portion 31, the unloaded passage portion 32, and the direction change passage portion 33 is opened to the bolt shaft 1 in the entire region, and the balls 3 arranged in the track groove 30 are oriented toward the bolt. The state of the slot shaft 1 circulates in the infinite loop path 30.

Fig. 4 shows a state in which the aforementioned track groove 30 is unfolded on a plane. The direction changing passage portion 33 has a portion for connecting the load passage portion 31 and the substantially U-shaped rail of the unloaded passage portion 32, the ball 3 that is rolled in along the inside of the load passage portion 31 in the state of the load load is released from the load, and the rolling direction of the ball 3 is gradually changed in the direction. After being converted by 180 degrees, it is sent to the aforementioned unloaded passage portion 32. The direction changing passage portion 33 is formed to be the shallowest at the connection portion with the load passage portion 31 and the deepest at the joint portion with the unloaded passage portion 32. When the direction change passage portion 33 is gradually deepened, the ball 3 that has been rolled in along the load passage portion 31 enters the direction change passage portion 33, and the ball 3 is released from the load and becomes in a no-load state, and then is turned in the direction change passage portion 33. The no-load passage portion 32 travels and enters the unloaded passage portion 32 in this state.

If the nut member 2 moves along the pinch shaft 1, the balls 3 held between the rolling groove 10 of the pinch shaft 1 and the load rolling groove 31a of the nut member 2, that is, the load passage portion 31 are present. The ball 3 moves along the inside of the load passage portion 31 at a speed of 0.5 V (half the moving speed V of the nut member 2 with respect to the pinch shaft 1). When the ball 3 that has been rolled in the inside of the load passage portion 31 reaches the direction change passage portion 33, the depth of the direction change passage portion 33 gradually becomes deeper as described above, and the load is gradually released. The ball 3 after the load is released is pushed by the subsequent balls 3 to travel in the rolling groove 10 of the pinch shaft 1, but the direction changing passage portion 33 blocks the rolling of the balls 3 that are rolled into the groove 10, so that The traveling direction of the ball 3 is forcibly changed, so that the ball 3 is pushed by the direction changing passage portion 33 to the side of the rolling groove 10, and climbs up the outer peripheral surface of the pinch shaft 1 along the shape of the outer peripheral surface of the pinch shaft 1. . Thereby, the ball 3 is completely separated from the rolling groove 10 of the pinch shaft 1 and is completely housed in the direction changing passage portion 33 of the nut member 2.

Since the direction changing passage portion 33 which is developed on the plane has a substantially U-shaped rail, the rolling direction of the balls 3 accommodated in the direction changing passage portion 33 can be reversed, and the outer peripheral surface of the bolt shaft 1 can be made to be opposed. The nut member 2 is placed in the unloaded passage portion 32. Further, the ball 3 traveling in the unloaded passage portion 32 enters the direction changing passage portion 33 on the opposite side, and once again, the rolling direction is reversed, and the rolling groove 10 of the bolt shaft 1 and the nut member 2 are entered. The load rolls into the groove 31a, that is, enters the load passage portion 31. At this time, the ball 3 enters the rolling groove 10 along the outer peripheral surface shape of the pinch shaft 1, and gradually shifts from the no-load state to the load load as the direction changing passage portion 33 gradually becomes shallow.

The balls 3 circulate in the track grooves 30 of the nut member 2 in this manner, so that the nut members 2 are continuously and continuously moved along the pinch shaft 1.

Fig. 5 is a perspective view showing the shape of the axial end surface 43 of the nut body 4, and the state in which the load passage portion 31 and the unloaded passage portion 32 are formed on the nut main body 4 can be observed. As shown in the figure, the load passage portion 31 and the unloaded passage portion 32 constituting the track groove 30 are inner circumferential surfaces formed in the through holes of the nut body 4, and are respectively penetrated through the slit-like openings 31b and 32a. The through hole of the nut body 4 is coupled to the state in which the plug shaft 1 inserted through the through hole is opened. The balls that are rolled in inside the load passage portion 31 are in contact with the rolling groove 10 of the bolt shaft 1 via the opening portion 31b.

The opening width d1 of the opening portion 31b and the opening width d2 of the opening portion 32a are both set to be smaller than the diameter of the ball 3, even if the nut structure is In a state where the member 2 is removed from the pinch shaft 1, the balls 3 that are rolled in the load passage portion 31 or the unloaded passage portion 32 do not fall off from the nut member 2 through the openings 31b and 32b.

Since the load passage portion 31 and the unloaded passage portion 32 are provided over the entire length of the nut body 4 in the axial direction, the nut body 4 has substantially the same cross-sectional shape over the entire length in the axial direction. Therefore, the shape of the inner circumferential surface of the nut body 4 including the load passage portion 31 and the unloaded passage portion 32 can be formed by wire-cut electrical discharge machining. In order to improve the surface roughness, the load rolling groove 31a provided in the load passage portion 31 can be subjected to on-line cutting and electric discharge processing, and then subjected to grinding processing or the like. Of course, in the case where the inner diameter of the through hole of the nut body 4 is sufficiently large, the wire-cut electric discharge machining is not employed, and the cylindrical nut body 4 having the uniform inner circumferential surface is subjected to drawing processing and cutting. The load passage portion 31 and the unloaded passage portion 32 may be formed by machining or grinding.

On the other hand, the direction changing passage portion 33 constituting the track groove 30 is formed in the end plate 5. Fig. 6 is a perspective view of the end plate 5 as seen from the side of the nut body 4. A direction changing groove 34 is formed on the inner peripheral surface of the through hole of the end plate 5, and a sealing protrusion 50 that faces the rolling groove 10 of the pinch shaft 1 with a slight gap therebetween is formed. The entire region of the direction changing groove 34 is opened toward the end surface 43 of the nut body 4, and the end surface of the nut body 4 which is finished into a flat surface is fitted to each other to constitute the direction changing passage portion 33 of the track groove 30.

Further, on the outer peripheral surface of the end plate 5, an entry and exit groove 51 continuous with the key groove of the nut body 4 is formed, even if the end plate 5 is fixed to the nut body 4. In the state, the key can still be slid into the key groove of the nut body 4 from the axial direction of the nut member 2. Further, a positioning boss 52 for positioning the nut body 4 is protruded from the end plate 5, and the end plate 5 can be assembled by fitting the boss 52 to the reference hole 41 of the nut body 4. The nut body 4 is correctly positioned, and the direction changing groove 34 on the end plate 5 side and the load passage portion 31 and the unloaded passage portion 32 on the nut body 4 side are correctly coupled.

Since the end plate 5 has a complicated shape, it can be produced by injection molding of a synthetic resin. In addition to the other production methods, metal injection molding (MIM molding) can also be employed. Further, as long as the outer diameter of the pin shaft is large enough to increase the size of the end plate, it may be formed by cutting.

In this manner, the direction changing passage portion 33 constituting the track groove 30 is formed by the cooperation of the direction changing groove 34 of the end plate 5 and the end surface 43 of the nut body 4, so that the ball 3 is the end surface 43 facing the nut body 4. The state is rolled in the direction switching passage portion 33. Therefore, as shown in Fig. 5, the inner guide curved surface 45 is formed at the opening edge of the load passage portion 31 and the unloaded passage portion 32 of the end surface 43 of the nut body, whereby the ball 3 is in the load passage portion 31 or none. When the load passage portion 32 and the direction change passage portion 33 are reciprocated, the opening edges of the load passage portion 31 and the unloaded passage portion 32 can be prevented from being caught, and the spherical surface of the balls 3 can be prevented from being injured. The inner guide curved surface 45 is composed of two continuous curved surfaces 45a and 45b, and the curved surfaces 45a and 45b are formed on the opening edges of the load passage portion 31 and the unloaded passage portion 32 of the end surface 43 of the nut body 4. Formed by cornering.

Fig. 7 is an enlarged cross-sectional view showing a state in which the end plate 5 is attached to the end surface 43 of the nut body 4, and is viewed from the direction of the arrow C in Fig. 3. The inner peripheral surface of the nut member 2 is looked like. As shown in FIG. 7, the direction change passage portion 33 includes an opening portion 33a that faces the inner peripheral surface of the nut member 2, and the balls 3 roll in the direction change passage portion 33 in a state facing the pinch shaft 1. As described above, the direction changing passage portion 33 is formed by the cooperation of the direction changing groove 34 of the end plate 5 and the end surface 43 of the nut body 4, and the opening portion 33a is formed by the peripheral portion of the direction changing groove 34. 34a (shown in Fig. 6) is formed opposite to the edge portion 43a (shown in Fig. 5) of the end surface 43 of the nut body.

The opening width d3 of the opening 33a is set to be smaller than the diameter of the ball 3, similarly to the opening width d1 of the load passage portion 31 and the opening width d2 of the unloaded passage portion 32, so even when the nut member 2 is In the state removed from the pinch shaft 1, the balls 3 rolled in the direction changing passage portion 33 do not fall off the nut member 2 through the opening portion 33a.

In the nut member 2, the track groove 30 for infinitely circulating the balls 3 is formed to face the pinch shaft 1, but the load passage portion 31 and the unloaded passage portion 32 which constitute the track groove 30 are Since the opening width of the direction changing passage portion 33 is set to be smaller than the diameter of the ball 3, even if the pinch shaft 1 and the nut member 2 are separated from each other, the balls 3 that are rolled inside the passages do not fall off from the track grooves 30. . Therefore, the ball-and-bolt device has an extremely easy operation in the conveyance and the arrangement of the bolt shaft.

Further, with respect to the structure for preventing the ball 3 from coming off the track groove 30, since it is realized only by the nut body 4 and the pair of end plates 5, this effect can be obtained with an extremely simple structure, and can be achieved at low cost. A ball hitch device excellent in operability is realized.

In particular, the opening portion 33a of the direction changing passage portion 33 is formed by the cooperation of the direction changing groove 34 of the end plate 5 and the end surface 43 of the nut body 4, and the opening width of the opening portion 33a is utilized by this cooperative action. Since d3 is set to be smaller than the diameter of the ball 3, it is easy to prevent the ball 3 from falling off by adjusting the groove depth of the direction changing groove 34 of the end plate 5. Therefore, simplification of the shape of the end plate 5 constituting the direction changing passage portion 33 can be achieved, and in this case, the ball stud device having excellent operability can be realized at low cost.

Next, a second embodiment of the ball stud shaft apparatus to which the present invention is applied will be described.

First, Fig. 8 is an exploded perspective view showing the ball stud shaft device of the second embodiment. In the first embodiment described above, the opening width of the direction changing passage portion 33 is set to be smaller than the ball diameter by the cooperation of the end plate 5 and the nut body 4. On the other hand, in the second embodiment, the end plate 5 is divided into the first plate 6 and the second plate 7, and the direction changing passage portion 33 whose opening width is restricted is formed by combining them. The other structures are the same as those in the first embodiment, and the same reference numerals will be given to the same numerals in the eighth embodiment, and the detailed description thereof will be omitted.

Fig. 9 is a perspective view showing the aforementioned first plate 6. The inner peripheral surface of the through hole of the first plate 6 is formed with an outer side guide groove 60 corresponding to each of the track grooves 30, and is formed to be opposed to the ball rolling surface 10 of the pinch shaft 1 with a slight gap therebetween. The projection 61 is sealed thereto. The outer guide groove 60 is provided with a peripheral edge portion 60a that faces the pin groove shaft. Further, in order to accommodate the sheet holding portion of the second plate 7 to be described later, the outer side guide grooves 60 are formed on the outer side in the radial direction. The pocket 63. Further, in the first plate 6, a pair of bosses 64 are protruded for positioning with respect to the nut body 4.

Fig. 10 is a perspective view showing the first plate 6 and the second plate 7 constituting the end plates. Four sheet holding portions 62 are formed on the outer circumferential surface of the second plate 7, and an inner guiding piece 65 is protruded from the inner side in the radial direction of the sheet holding portion 62. The inner guide piece 65 includes an edge portion 65a that faces the peripheral edge portion 60a of the outer guide groove 60 of the first plate 6. In the second plate, a stud insertion portion 66 corresponding to the stud 64 of the first plate 6 is formed.

Fig. 11 is a perspective view showing the end plate 5 combined by the first plate 6 and the second plate 7. If the first plate 6 and the second plate 7 are combined, the sheet holding portion 62 of the second plate 7 is fitted into the receiving groove 63 of the first plate 6, and the inner guiding piece 65 of the second plate 7 is located at the foregoing The central portion of the outer guide groove 60 of the one plate 6 constitutes a substantially U-shaped direction changing passage portion 33. As shown in the figure, the direction changing passage portion 33 is opened toward the bolt shaft 1, and the balls 3 are rolled in the direction changing passage portion 33 in a state facing the bolt shaft 1.

Further, as described above, the positioning boss 64 for positioning the nut body 4 is protruded from the first plate 6, and the boss insertion portion 66 is provided in the second plate 7. By inserting the stud 64 into the stud insertion portion 66 to correctly position the inner guide piece 65 to the outer guide groove 60 of the first plate 6, the accuracy of the direction changing passage portion 33 can be improved. . Further, by fitting the boss 64 projecting from the second plate 7 to the reference hole provided in the nut body 4, the completed end plate 5 can be correctly positioned on the nut body 4. That is, the end portion of the direction changing passage portion 33 and the load passage portion of the nut body 4 can be made 31 and the no-load passage portion 32 are correctly connected.

Fig. 12 is a partial cross-sectional view showing a state in which the first plate 6 and the second plate 7 are attached to the nut body 4. As shown in the figure, the direction changing passage portion 33 is provided with an opening portion 33a that faces the inner peripheral surface of the nut member 2, and the balls 3 are rolled in the direction changing passage portion 33 in a state facing the pinch shaft 1. As described above, the direction changing passage portion 33 is formed by the cooperation of the outer guiding groove 60 of the first portion 6 and the inner guiding piece 65 of the second plate 7, and the opening portion 33a is made by the first plate The peripheral edge portion 60a of the outer guide groove 60 of 6 and the edge portion 65a of the inner guide piece 65 of the second plate 7 are formed to face each other.

Similarly to the first embodiment, the opening width d3 of the opening portion 33a is set to be smaller than the diameter of the ball 3, similarly to the opening width d1 of the load passage portion 31 and the opening width d2 of the load-free passage portion 32. Therefore, even in a state where the nut member 2 is removed from the pinch shaft 1, the balls 3 rolled in the direction changing passage portion 33 do not fall off the nut member 2 through the opening portion 33a.

The first plate 6 and the second plate 7 are formed in a complicated shape as in the first embodiment, and can be produced by injection molding using a synthetic resin. In addition, metal injection molding (MIM forming) can also be used. Further, as long as the outer diameter of the bolt shaft is large enough to increase the size of the end plate, it can be formed by cutting.

In the above description, the present invention will be described in detail by way of an example in which a ball screw groove device (a nut member as a sliding member is assembled as a pin groove shaft as a guide shaft), but the object of application of the present invention is not limited thereto, and for example Can be applied to A linear guide (a moving block that is a sliding member is assembled in a rail that is disposed in a fixed portion of a machine tool or a frame).

1‧‧‧guide shaft (bolt shaft)

2‧‧‧ Nut components

3‧‧‧ balls

4‧‧‧The nut body

5‧‧‧End board

6‧‧‧ first board

7‧‧‧ second board

10, 10a, 10b‧‧‧ rolling into the slot

30‧‧‧ Track slot

31‧‧‧Load Path Department

31a‧‧‧Load rolling groove

31b, 32a‧‧‧ openings

32‧‧‧No load path department

33‧‧‧ Directional conversion path

33a‧‧‧ openings

34‧‧‧direction change slot

34a‧‧‧The Peripheral Department

43‧‧‧ end face

43a‧‧‧Edge

45‧‧‧Inside guide surface

45a, 45b‧‧‧ surface

50‧‧‧ Sealing protrusion

51‧‧‧In and out slot

52‧‧‧Positioning column

60‧‧‧Outer guiding groove

60a‧‧‧The Peripheral Department

61‧‧‧ Sealing protrusion

62‧‧‧Piecekeeping Department

63‧‧‧ accommodation trough

64‧‧‧Bump

65‧‧‧Inside guide piece

65a‧‧‧Edge

66‧‧‧Post-column insertion

Fig. 1 is a partially exploded perspective view showing the first embodiment in which the present invention is applied to a ball stud device (linear guide device).

Fig. 2 is a cross-sectional view perpendicular to the axial direction of the ball stud device shown in Fig. 1.

Fig. 3 is a partially enlarged view showing in detail a load passage portion and a no-load passage portion formed in the nut body of the first embodiment.

Fig. 4 is a view showing a state in which the track grooves provided in the nut member of the first embodiment are unfolded on a plane.

Fig. 5 is an enlarged perspective view showing a state in which a load passage portion and a no-load passage portion are formed in a nut body according to the first embodiment.

Fig. 6 is a perspective view showing an end plate constituting the nut member of the first embodiment.

Figure 7 is a view of the arrow C of Figure 3.

Fig. 8 is an exploded perspective view showing the ball stud device of the second embodiment.

Fig. 9 is a perspective view showing the first plate constituting the end plate of the second embodiment.

Fig. 10 is an exploded perspective view showing the end plate of the second embodiment.

Fig. 11 is a perspective view showing the end plate of the second embodiment.

Figure 12 is a view showing the shaft and the shaft of the ball-and-groove device of the second embodiment A partial cross-section of the direction parallel.

1‧‧‧guide shaft (bolt shaft)

2‧‧‧ Nut components

3‧‧‧ balls

10a, 10b‧‧‧ rolling into the slot

30‧‧‧ Track slot

31‧‧‧Load Path Department

32‧‧‧No load path department

33‧‧‧ Directional conversion path

Claims (4)

A ball bolting device is characterized in that: a plurality of balls (3), a bolt shaft (1) and a nut member (2), the bolt shaft (1) is formed in a cylindrical shape and is along the outer peripheral surface A rolling groove (10) of a plurality of the balls (3) is disposed in a long direction; the nut member (2) has a through hole through which the bolt shaft (1) is inserted, and is formed in a cylindrical shape and has the foregoing The infinite circulation path of the ball (3) is configured to be movable along the aforementioned groove axis (1) in accordance with the circulation of the ball (3), and includes a metal nut body (4) and a screw attached thereto. An end plate (5) of one pair of end faces of the cap body (4); the infinite circulation path includes a load passage portion (31), a no-load passage portion (32), and a pair of direction changing passage portions (33) Further, the load passage portion (31) has a load rolling groove (31a) opposed to the rolling groove (10) of the bolt shaft (1), and has an opening width smaller than the aforementioned ball diameter. a slit-shaped opening (31b) that opens toward the plug shaft (1) is formed on the inner peripheral surface of the through hole, and the ball (3) is rolled in a load load state; the unloaded The passage portion (32) is disposed in parallel with the load passage portion (31) on the inner circumferential surface of the through hole, and the ball (3) is rolled in an unloaded state inside, and is larger than the ball diameter. a smaller opening width opens toward the pin groove axis (1); the pair of direction changing passage portions (33) are formed on the inner peripheral surface of the through hole for the load path portion (31) and the The unloaded passage portion (32) is connected and connected to allow the balls to travel between them, etc. An opening width having a smaller ball diameter is opened toward the pin groove axis (1), and the load passage portion (31), the unloaded passage portion (32), and the pair of direction changing passage portions (33) are configured to face the plug The track groove (30) as the infinite circulation path of the slot shaft (1) is opened, and the opening width toward the pin groove axis (1) is set to be larger than that of the ball (3) over the entire circumference of the track groove (30) The inner diameter of the through hole of the nut body (4) is not attached to another member, and the load passage portion (31) and the unloaded passage portion (32) are formed at the end of the pair. The direction change path portion (33) is formed on the plate (5). The ball-and-pin groove device according to claim 1, wherein an opening width of the load passage portion (31) facing the bolt shaft (1) is set to be larger than an opening width of the unloaded passage portion (32). Big. The ball-and-pin groove device according to the first aspect of the invention, wherein the opening (33a) of the direction changing passage portion (33) facing the plug shaft (1) is formed by using the end plate (5) and the foregoing The end faces (43) of the nut body (4) are formed in cooperation. The ball-and-pin groove device according to claim 3, wherein the end plate (5) is composed of a first plate (6) and a second plate (7) which are overlapped and fixed to the nut body (4). The opening (33a) of the direction changing passage portion (33) facing the pin groove shaft (1) is formed by the cooperation of the first plate (6) and the second plate (7).