TWI491819B - Adjustable pre-pressing device - Google Patents

Description

Adjustable preloading device

The present invention provides an adjustable preloading device that is associated with a linear actuator.

The ball screw, which has high mechanical strength and high precision transmission characteristics, is widely used in various fields, and the ball screw mainly comprises a nut which can be linearly displaced on a screw, and the nut and the nut There is a rolling path between the screws for the plurality of rolling elements to be accommodated, and the nut is smoothly linearly displaced by the rotation of the screw and the continuous rolling of the rolling elements; the backlash of the rolling elements must be ensured to ensure the transmission precision. It is minimized, so the backlash is eliminated by applying a preload. As shown in Fig. 1, a conventional method of applying preload is provided, which mainly opens an opening 11 on the nut 10 of the ball screw. And controlling the size of the opening 11 by the locking of the adjusting bolt 12, locking the adjusting bolt 12 to reduce the opening 11 and tightening the nut 10 and generating a radial preload on the rolling member 13; The manner of application cannot be uniformly applied to the rolling member 13, thus causing the rolling member 13 to be in a state of unsmooth operation; and as shown in Fig. 2, another conventional pre-pressing device 20 is shown, which is mainly Ball screw Two pre-pressing sheets 22 having inclined faces are disposed between the two nuts 21, and the two pre-pressing sheets 22 have corresponding inclined surfaces 221, and the thickness of the two pre-pressing sheets 22 is adjusted to change the thickness, thereby generating pre-compression; While the pre-pressing device 20 can apply the pre-compression, the two pre-pressing sheets 22 only pass through the inclined surface 221 against the limit of a fixed key 23, and there is no stable bonding force between the two pre-pressing sheets 22, Therefore, during the use, the two pre-pressing sheets 22 will slip and cause the pre-pressure to disappear, and the inspection must be continuously adjusted during use, and there is inconvenience in use; in view of this, the inventors have studied and deepened. After the conception, after several trials and developments, an adjustable preloading device was finally invented.

The invention provides an adjustable preloading device whose main purpose is to improve the uneven application of the preloading and the lack of structural instability.

In order to achieve the above object, the present invention provides an adjustable pre-pressing device for being disposed between two nuts of a ball screw, the two nuts respectively having a device end face, and the pre-pressing device comprises: a predetermined pre-compression And a ring body structure is fixedly disposed on one end surface of the device of the nut, and one side of the fixed pre-pressing member is equally divided into a plurality of convex steps, each convex step has a convex height, adjacent convex steps The utility model has a height difference; an adjusting pre-pressing member, an annular sheet body structure and a plurality of adjusting concave portions are equally divided on one side, and the shape of each adjusting concave portion is formed corresponding to the shape of each convex step, and the adjusting pre-pressing member adjusts the concave portion to match the fixed portion a convex step of the pre-pressing member, each adjusting concave portion has a concave portion depth, the adjacent adjusting concave portion has a depth difference; and the adjusting pre-pressing member abuts against the end surface of the other nut; and a fixing device is provided Connect the two nuts.

By setting the pre-pressing member between the two nuts and adjusting the pre-pressing member, the position of the combined pre-pressing member and the adjusting pre-pressing member can be changed to change the thickness of the combination at the same time, so that the nut is displaced and the shaft is uniformly applied. Preloading, and the positioning of the pre-pressing piece and the adjusting pre-pressing piece through the convex step and the adjusting concave portion can stably form the limit after the adjustment, in addition to the structural stability, the pre-pressure adjustment can also be improved. stability.

"Knowledge Technology"

10‧‧‧ nuts

11‧‧‧ openings

12‧‧‧Adjusting bolts

13‧‧‧Rolling parts

20‧‧‧Preloading device

21‧‧‧ nuts

22‧‧‧Pre-press

221‧‧‧Bevel

23‧‧‧Fixed keys

"this invention"

30‧‧‧ Nuts

31‧‧‧ device end face

311‧‧‧ Positioning Department

32‧‧‧ outer perimeter

321‧‧‧ keyway

40‧‧‧Fixed preloading parts

41‧‧‧ positioning surface

411‧‧‧With the positioning department

42‧‧‧ matching face

421‧‧‧

43‧‧‧Circular surface

431‧‧‧ keyway

50‧‧‧ positioning parts

60‧‧‧Adjusting preloading parts

61‧‧‧Snap surface

62‧‧‧Adjustment

621‧‧‧Adjusting the recess

63‧‧‧Circular surface

631‧‧‧ keyway

70‧‧‧Fixed devices

71‧‧‧Link key

72‧‧‧Fixed parts

H‧‧‧height height

△H‧‧‧ height difference

D‧‧‧ recess depth

△D‧‧‧depth difference

A‧‧‧Rolling parts

Fig. 1 is a schematic view showing the state of a conventional method of applying preload.

Figure 2 is a schematic illustration of another conventionally applied pre-stressing device.

Fig. 3 is a schematic exploded perspective view of the adjustable preloading device of the present invention.

Fig. 4 is a schematic view showing the appearance of a three-dimensional structure of the adjustable preloading device of the present invention.

Fig. 5 is a schematic view showing the structure of the pre-pressing member and the adjusting pre-pressing member in the adjustable preloading device of the present invention.

Fig. 6 is a schematic view showing the arrangement of the step height and the depth of the recess of the pre-pressing member and the adjusting pre-pressing member in the adjustable preloading device of the present invention, and is an initial state of complete mating.

Fig. 7 is a schematic view showing the arrangement of the step height and the depth of the recess of the pre-pressing member and the adjusting pre-pressing member in the adjustable preloading device of the present invention, and changing the thickness after adjustment.

Fig. 8 is a schematic view showing the combination of the pre-pressing member and the adjusting pre-pressing member in the adjustable preloading device of the present invention, and is in an initial state of complete mating.

Fig. 9 is a schematic view showing the combination of the pre-pressing member and the adjusting pre-pressing member in the adjustable preloading device of the present invention, and changing the thickness after adjustment.

Fig. 10 is a schematic view showing the state of use of the adjustable preloading device in combination with the ball screw of the present invention, and is an initial state of complete mating.

Fig. 11 is a schematic view showing the state of use of the adjustable preloading device in combination with the ball screw of the present invention, and is in a state of changing the thickness after adjustment.

In order to enable the reviewing committee to have a better understanding and understanding of the purpose, features and effects of the present invention, the following is a detailed description of the following: a preferred embodiment of the adjustable preloading device of the present invention. 3 to 9 are provided between two nuts 30 disposed on a ball screw. The nut 30 has a device end surface 31 and an outer circumferential surface 32, wherein a plurality of device end faces 31 of a nut 30 are provided. The positioning portion 311 of the present embodiment is a receiving groove structure, and the outer peripheral surface 32 of the nut 30 is respectively provided with a key groove 321 , and the pre-pressing device comprises: a preset pre-pressing member 40, and an annular piece structure And the fixed pre-pressing member 40 has an opposite positioning surface 41, a pair of mating surfaces 42 and a circumferential surface 43 formed between the positioning surface 41 and the mating surface 42. The positioning of the fixed pre-pressing member 40 The surface 41 is provided with a plurality of matching positioning portions 411. The matching positioning portion 411 of the present embodiment is a receiving groove structure. The positioning and pressing member 40 is adhered to the device end surface 31 of the nut 30 by the positioning surface 41, and the plurality of positioning members are used. The 50 is placed in the positioning portion 311 and the matching positioning portion 411 to form a positioning. The positioning member 50 of the embodiment is a positioning pin; and the mating surface 42 of the fixed pre-pressing member 40 is equally divided into a plurality of convex steps 421, each of the convex steps 421 has a convex height H, and the adjacent convex steps 421 There is a height difference ΔH, and the height H of each step of the embodiment is sequentially increased. As shown in FIG. 6, the schematic diagram of the convex height H of the present invention; the circumference of the fixed pre-press 40 The surface 43 is equally divided into a plurality of key grooves 431, an adjustment preload member 60, an annular sheet structure, and the adjustment preload member 60 has An opposing abutment surface 61, an adjustment surface 62, and a circumferential surface 63 formed between the abutment surface 61 and the adjustment surface 62, and the adjustment surface 62 of the adjustment preloading member 60 is equally divided into a plurality of adjustment recesses. 621, the shape of each of the adjustment recesses 621 is shaped corresponding to the shape of each of the protrusions 421, so that each of the adjustment recesses 621 can be aligned with each of the protrusions 421 of the fixed pre-press 40, and each of the adjustment recesses 621 has a recess depth D, The adjacent adjustment concave portion 621 has a depth difference ΔD, and the depth D of each concave portion is sequentially reduced. FIG. 6 is a schematic view showing the configuration of the depth D of the concave portion of the present invention; and the maximum convex height of the embodiment The sum of H and the minimum recess depth D is equal to the sum of the minimum convex height H and the maximum concave depth D, and in this state, the sum of the convex heights H and the recess depth D is the same, as in the first 6, 8, 10 state; the abutment surface 61 of the adjustment pre-pressing member 60 abuts against the device end surface 31 of the other nut 30, and the circumferential surface 63 of the adjustment pre-pressing member 60 is equally divided Forming a plurality of keyways 631; and a fixing device 70 for connecting the two nuts 30, the fixing device 70 comprising The connecting key 71 and the two fixing members 72 are received in the key grooves 321, 431, and 631 of the nut 30, the fixed pre-pressing member 40, and the adjusting pre-pressing member 60, and are passed through the fixing member. 72 is formed through the two ends of the connecting key 71 and the two nuts 30 to form a positioning.

The above is the structural configuration and characteristics of the adjustable preloading device of the present invention, and the initial state of the unadjusted state, as shown in Figures 4, 6, 8, and 10, the convex step 421 and the adjustment pre-form of the fixed pre-pressing member 40 The adjusting concave portion 621 of the pressing member 60 is in a completely fitting tight state; and when the pre-pressing pre-compression is performed, as long as the fixing device 70 is loosened, the adjusting pre-pressing member 60 can be rotated in this state to make the adjustment. The pre-pressing member 60 is opposed to each of the convex steps 421 by adjusting recesses 621 having different recess depths D, as shown in Figures 7, 9 and 11; please refer to Figures 6 and 7, and Figure 6 shows the fixed pre-pressing member 40. The initial state of the convex step 421 and the adjusting concave portion 621 of the adjusting pre-pressing member 60 is completely matched, and the convex height H of the convex step 421 shown in the figure is H1, H2, H3 and H4, respectively, and the convex step 421 The recessed depth D of the mating adjustment recess 621 is D1, D2, D3, and D4, respectively; wherein the D2 is smaller than D3, when the pre-press is pre-adjusted, the adjusting pre-press 60 is rotated, and the depth D is changed to The adjustment recess 621 of D2 is opposite to the convex step 421 of the height H of the convex step H, as shown in Fig. 9, so that the fixed pre-press 40 and the adjustment are made Produce increased height difference △ D to the depth between the pressing member 60, i.e. the set-preload adjustment member 40 to increase the thickness of the combination of a pre-press 60, so, two The thickness of the pre-pressing device between the nuts 30 is increased to produce the purpose of applying the pre-compression; and the present invention is capable of uniformly pre-pressing the rolling elements A in the ball screw by the displacement of the nut 30. Preloading is applied to the rolling elements A to ensure the smoothness of rolling of the rolling elements A; and the present invention can provide the purpose of adjusting the preloading by the combination of the fixed pre-pressing members 40 and the adjusting pre-pressing members 60, and the structural composition It is very simple, so the cost of assembly and production can be reduced, and the fixed pre-pressing member 40 and the convex step 421 of the adjusting pre-pressing member 60 and the adjusting concave portion 621 are combined in a way of being combined, so that the adjusting can be stably positioned. It is not easy to loosen, and the stability after pre-stress adjustment can be ensured; at the same time, the pre-pressing device of the present invention can be adjusted only by loosening the fixing device 70, without using special tools or performing secondary operations. The pre-press adjustment can be completed by machining, and the convenience in use is extremely high.

30‧‧‧ Nuts

31‧‧‧ device end face

311‧‧‧ Positioning Department

32‧‧‧ outer perimeter

321‧‧‧ keyway

40‧‧‧Fixed preloading parts

41‧‧‧ positioning surface

42‧‧‧ matching face

421‧‧‧

43‧‧‧Circular surface

431‧‧‧ keyway

50‧‧‧ positioning parts

60‧‧‧Adjusting preloading parts

61‧‧‧Snap surface

62‧‧‧Adjustment

621‧‧‧Adjusting the recess

63‧‧‧Circular surface

631‧‧‧ keyway

70‧‧‧Fixed devices

71‧‧‧Link key

72‧‧‧Fixed parts

Claims (5)

An adjustable pre-pressing device is provided between two nuts arranged on a ball screw, the two nuts respectively have a device end face, and the pre-pressing device comprises: a pre-pressed piece, an annular piece structure and fixed a device end surface disposed on one of the nuts, and a plurality of convex steps are equally divided on one side of the fixed pre-pressing member, each convex step has a convex step height, and each convex step height is sequentially increased, adjacent The convex step has a height difference; an adjustment pre-pressing member, the annular sheet body structure and a plurality of adjusting concave portions are equally divided on one side, and the shape of each adjusting concave portion is formed corresponding to the shape of each convex step, and the adjusting pre-pressing member adjusts the concave portion Forming the convex step of the pre-pressing member, each adjusting concave portion has a concave portion depth, each concave portion has a decreasing depth, and the adjacent adjusting concave portion has a depth difference; and the largest convex height has the smallest height The sum of the depths of the recesses is equal to the sum of the minimum step height and the maximum recess depth, and the sum of the convex heights of the respective pairs is the same as the sum of the depths of the recesses, and the adjustment pre-pressure member abuts against the end surface of the device of the other nut And a fixing means for coupling to the two nuts. The adjustable preloading device according to claim 1, wherein the fixed pre-pressing member has a relative positioning surface and a pair of matching surfaces, wherein the positioning surface is provided with a plurality of matching positioning portions, and each of the convex steps is disposed on a plurality of positioning portions are disposed on the end surface of the device, and the fixed pre-pressing member is attached to the end surface of the device of the nut by the positioning surface, and the plurality of positioning members are inserted into the positioning portion and The mating positioning portion forms a positioning. The adjustable preloading device according to claim 2, wherein each of the positioning portions is a receiving groove structure, and each of the matching positioning portions is a receiving groove structure, and each of the positioning members is a positioning pin. The adjustable preloading device according to claim 1, wherein the adjusting pre-pressing member has an opposite abutting surface and an adjusting surface, and the adjusting pre-pressing member abuts against the other screw with the abutting surface The end face of the device of the cap. The adjustable preloading device according to claim 1, wherein the two nuts respectively have an outer peripheral surface, and the outer peripheral surfaces of the two nuts are respectively provided with a key groove; and the positioning surface of the fixed pre-pressing member And having a circumferential surface between the mating surfaces, the circumferential surface of the fixed pre-pressing member is equally divided into a plurality of key grooves; the adjusting surface of the adjusting pre-pressing member and the adjusting surface have a circumferential surface, the adjusting pre-compression The plurality of key grooves are equally formed on the circumferential surface of the ring, and the fixing device comprises a connecting key and two fixing members, and the connecting key is received in the two key nuts, the fixed pre-pressing piece and the key groove of the adjusting pre-pressing piece Inside, And positioning through the two fixing members through the two ends of the connecting key and the two nuts.