JPH0625649U - Thrust adjusting mechanism of bearing type linear motion device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Perform two-step adjustment of thrust of a bearing type linear motion device easily and in a short time. [Structure] Each of the block halves 2a and 2b includes
A ball bearing is attached so as to be inclined with respect to the drive shaft 34, and the ball bearing is in contact with the drive shaft 34. The cap screws 14 and 16 are inserted into the screw insertion holes 6 and 8 of the block half 2a and screwed into the screw holes 10 and 12 of the block half 2b.
Torque springs 28 and 30 are compressed and arranged in the spring arrangement portions 6a and 8a of the screw insertion holes 6 and 8 of the block half 2a. The plate 22 is inserted and arranged between the torque springs 28 and 30 and the caps 14 a and 16 a of the cap screws 14 and 16. The plate 22 is connected to the torque springs 28 and 30 and the cap 14a,
The thrust force of the bearing type linear motion device can be adjusted in two stages by inserting or removing it between 16a and 16a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thrust adjusting mechanism for a bearing type linear motion device.

[0002]

[Prior art]

 The bearing type linear motion device has a structure in which two sets of aluminum block halves that hold the drive shaft through bearings are fixed by two sets of springs and cap screws. Therefore, by tightening the two sets of cap screws evenly, the load on the bearing changes and the frictional force between the drive shaft and the bearing changes.

That is, by changing the tightening amount of the cap screw, the thrust of the linear motion device itself can be changed. In this type of device, trouble may occur during operation of the device, and excessive force may be applied to the device. In this case, since the bearing type linear motion device transmits power by the frictional force between the drive shaft and the bearing, unlike the ball screw type linear motion device, if the necessary thrust is adjusted, the thrust will exceed the thrust. When this force is applied to the linear motion device, slippage occurs between the drive shaft and the bearing, which can protect the linear motion device.

[0004]

[Problems to be solved by the device]

 As is clear from the above description, in the bearing type linear motion device, adjustment of thrust requires adjustment work to evenly tighten the two springs, and this work is extremely troublesome and time-consuming. Existed. The present invention aims to solve this problem.

[0005]

[Means for solving problems]

 In order to achieve the above object, the present invention provides a shaft hole (4) in the facing surface of a pair of block halves (2a) (2b) facing each other, and among the pair of block halves (2a) (2b), Screw holes (10) and (12) are provided on both sides of the shaft hole (4) in one block half (2b), and the other block half (2a) of the block half (2a) and (2b) is provided. ) Is provided with a screw insertion hole (6) (8) having a spring placement portion (6a) (8a) formed coaxially with the screw hole (10) (12), and the spring placement portion (6a) (8a) is opened on the open surface of the other block half (2a), and the cap screws (14) and (16) are inserted into the screw insertion holes (6) and (8) of the other block half (2a). In addition, Screws (14) and (16) into the screw holes (10) and (12) of the one block half (2b), and engage with the lower surfaces of the caps (14a) and (16a) of the cap screws (14) and (16). As described above, the torque springs (28) and (30) are compressed and arranged in the spring arrangement portions (6a) and (8a), and the drive shaft (34) is loosely fitted and arranged in the shaft hole (4). ) (2b) each having a ball bearing (32) tilted with respect to the drive shaft (34), the thrust adjusting mechanism of the bearing type linear motion device, wherein the torque springs (28) (30) and the cap are provided. The plate (22) is inserted and removed between the caps (14a) (16a) of the screws (14) and (16).

[0006]

[Action]

 By inserting or removing the plate 22 between the caps 14a, 16a of the cap screws 14, 16 and the torque springs 28, 30, the load applied from the drive shaft 34 to the ball bearing 32 can be easily adjusted in two steps. it can.

[0007]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. In FIG. 1, reference numeral 2 is a block, and the block 2 is composed of two block halves 2a and 2b.

A recess having a semicircular cross section is formed on the opposing surfaces of the two block halves 2 a and 2 b, and a shaft hole 4 is formed in the center of the block 2 by the recess.

The block half 2 a is provided with screw insertion holes 6 and 8 located on both sides of the shaft hole 4 and having a small diameter portion and a large diameter portion. Screw holes 10 and 12 are provided through the block half 2b so as to be coaxial with the screw insertion holes 6 and 8. The large diameter portions of the screw insertion holes 6 and 8 constitute spring placement portions 6a and 8a.

Cap screws 14 and 16 are slidably inserted in the screw insertion holes 6 and 8 in the axial direction, and the cap screws 14 and 16 are screwed into the screw holes 10 and 12 of the block half 2b. ing.

Set screws 18 and 20 are screwed into the screw holes 10 and 12, and the lower ends of the cap screws 14 and 16 are in pressure contact with them. The set screws 18 and 20 prevent axial displacement of the lower end positions of the cap screws 14 and 16.

Reference numeral 22 is a plate, and screw disposing holes 24, 26 composed of small-diameter holes 24a, 26a and large-diameter holes 24b, 26b are provided at positions corresponding to the screw insertion holes 6, 8 thereof. There is. The small diameter holes 24a and 26a are formed to have a diameter slightly larger than the diameter of the shaft portion of the cap screws 14 and 16, and the large diameter holes 24b and 26b are the diameters of the caps 14a and 16a of the cap screws 14 and 16, respectively. It is formed to have a slightly larger diameter.

The large-diameter holes 24b and 26b are perpendicular to the axis L 1 that connects the centers of the small-diameter holes 24a and 26a, and are located on the axes L2 and L3 that pass through the centers of the small-diameter holes 24a and 26a. It is formed integrally with 24a and 26a.

Reference numerals 28 and 30 denote coil-shaped torque springs, which are arranged in the spring arrangement portions 6 a and 8 a, respectively.

As shown in FIGS. 3 and 4, three ball bearings 32 are rotatably supported on each end surface of the block 2, respectively. Two ball bearings 32 are pivotally supported on each end surface of the block half 2a, and one ball bearing 32 is pivotally supported on each end surface of the block half 2b.

The ball bearings 32 are mounted so as to be inclined with respect to the drive shaft 34 that is loosely fitted in the shaft hole 4, and the surface of each ball bearing 32 is in contact with the drive shaft 34.

Next, the operation of this embodiment will be described. When it is desired to increase the thrust of the block 2, the plate 22 is arranged on the upper surface of the block half 2a. In order to arrange the plate 2a, first, the large diameter holes 24b and 26b of the screw arrangement holes 24 and 26 of the plate 22 are aligned with the caps 14a and 16a of the cap screws 14 and 16, respectively. Next, at this position, the plate 22 is pushed down against the resilience of the torque springs 28 and 30, and the upper surface of the plate 22 is made lower than the lower ends of the caps 14a and 16a.

Next, the plate 22 is moved in the axial direction along the upper surface of the block half 2a, and the small diameter holes 24a and 26a of the plate 22 are fitted into the shaft portions of the cap screws 14 and 16. In this state, the plate 22 is inserted and arranged between the upper ends of the torque springs 28 and 30 and the caps 14a and 16a of the cap screws 14 and 16.

When the plate 22 is inserted between the torque springs 28, 30 and the caps 14a, 16a, the elastic force of the torque springs 28, 30 causes the block half 2b to approach the block half 2a. Force acts on the block half 2a as a fulcrum. The force is proportional to the amount of deflection of the torque springs 28, 30 caused by the thickness of the plate 22, and this force increases the pressure contact force, that is, the frictional force of the ball bearing 32 with respect to the drive shaft 34.

Next, when the drive shaft 34 is rotated, this rotation is converted into a linear movement of the block 2 according to the lead of the ball bearing 28. The thrust of the block 2 is determined by the frictional force of the ball bearing 32 with respect to the drive shaft 34. When it is desired to weaken the thrust of the block 2, the plate 22 is displaced in the directions of the axes L2, L3 so that the large diameter holes 24b, 26b are aligned with the caps 14a, 16a, and then the plate 22 is removed from the upper surface of the block half 2a. Pull out.

When the plate 22 is removed from the block half 2a, the upper ends of the torque springs 28 and 30 make elastic contact with the caps 14a and 16a, and the pulling force of the torque springs 28 and 30 to the block half 2b is increased. Is weakened by the thickness of the plate 22.

As described above, when the thrust of the block 2 is desired to be increased, the plate 22 is sandwiched between the torque springs 28 and 30 and the caps 14a and 16a, and when it is desired to be weakened, the plate 22 is pulled out from between them. Two-stage thrust adjustment can be performed.

The set screws 18 and 20 are pressed against the cap screws 14 and 16 to serve as stoppers against them, and even if the plate 22 is repeatedly put in and taken out on the block half 2a, the torque spring 28 The spring height of 30 can be kept constant at all times.

[0024]

【effect】

 Since the present invention is configured as described above, there is an effect that the thrust of the bearing type linear motion device can be easily adjusted in two steps.

[Brief description of drawings]

FIG. 1 is a cross-sectional view.

FIG. 2 is a plan view of a plate.

FIG. 3 is a side view.

FIG. 4 is a side view.

[Explanation of symbols]

 2 block 4 shaft hole 6 screw insertion hole 8 screw insertion hole 10 screw hole 12 screw hole 14 cap screw 16 cap screw 18 set screw 20 set screw 22 plate 24 screw arrangement hole 26 screw arrangement hole 28 torque spring 30 torque spring 32 ball bearing 34 Drive shaft

Claims (3)

[Scope of utility model registration request] 1. A pair of block halves (2a) (2b) facing each other are provided with shaft holes (4) in the facing surfaces, and one block half (2b) of the pair of block halves (2a) (2b) is provided. ) Is provided with screw holes (10) and (12) on both sides of the shaft hole (4), and the other block half (2) of the block halves (2a) and (2b) is provided.
a) is provided with screw insertion holes (6) and (8) in which spring placement portions (6a) and (8a) are formed coaxially with the screw holes (10) and (12).
a) (8a) is opened on the open surface of the other block half (2a), and the cap screws (14) (1
6) is inserted into the screw insertion holes (6) (8) of the other block half (2a), and the cap screws (14) (16) are inserted into the other block half (2).
screw into the screw holes (10) and (12) of b), and cap (14a) of the cap screws (14) and (16).
The torque springs (28) and (3) are attached to the spring placement portions (6a) and (8a) so as to engage with the lower surface of (16a).
0) is arranged in a compressed manner, the drive shaft (34) is loosely fitted in the shaft hole (4), and the block halves (2a) and (2b) are tilted with respect to the drive shaft (34) and ball bearings In the thrust adjusting mechanism of the bearing type linear motion device having (32) attached, the torque spring (28)
A thrust adjusting mechanism for a bearing type linear motion device, wherein a plate (22) is disposed between the cap (14) and the caps (14a) and (16a) of the cap screws (14) and (16) so as to be freely inserted and removed. 2. A small diameter hole (24a) (26a) in the plate (22) having a diameter slightly larger than a shaft portion of the cap screw (14) (16), and a cap of the cap screw (14) (16). The bearing type linear motion according to claim 1, wherein the screw arrangement holes (24) and (26) are formed of large diameter holes (24b) and (26b) slightly larger than (14a) and (16a). Device thrust adjustment mechanism. 3. The cap screw (1) is inserted into the screw holes (10) (12) of the one block half (2b).
4) Set screws (18) (2) that lock the lower ends of (16)
A thrust adjusting mechanism for a bearing type linear motion device characterized in that 0) is screwed in.