CN217301483U

CN217301483U - Internal circulation type ball screw rod bearing

Info

Publication number: CN217301483U
Application number: CN202221265765.4U
Authority: CN
Inventors: 杨超; 季英昌; 吕海洋
Original assignee: Wenzhou Silent Transmission Technology Co ltd; Shanghai C&U Group Co Ltd; C&U Co Ltd
Current assignee: Wenzhou Silent Transmission Technology Co ltd; Shanghai C&U Group Co Ltd; C&U Co Ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-08-26
Anticipated expiration: 2032-05-20

Abstract

The utility model discloses an internal circulation type ball screw bearing, which comprises a screw rod, a nut and balls, wherein the surface of the screw rod is provided with a first raceway, the nut is arranged on the screw rod, and the balls are arranged inside the nut and matched with the screw rod; the nut is provided with a second raceway matched with the first raceway, the balls are positioned in the first raceway and the second raceway, and the axial end part of the nut is provided with an annular boss which is coaxially arranged with the screw rod and is sleeved on the screw rod; and the inner wall of the boss is provided with an external thread matched with the first raceway, and the external thread is in threaded fit with the first raceway. The utility model discloses can improve bearing axial bearing capacity, improve intensity and prevent the axial shock effect.

Description

Internal circulation type ball screw bearing

Technical Field

The utility model relates to an internal circulation formula ball screw bearing.

Background

At present, a common internal circulation type roller screw bearing is composed of a screw and a nut (provided with balls inside and matched with a raceway on the surface of the screw to roll). The axial bearing capacity of the structure mainly depends on the matching between the ball and the raceway on the nut to carry out axial limiting, and the screw pitch of the raceway on the screw rod is smaller, so that the support strength of the raceway is not high, and the axial bearing capacity of the existing structure is poor.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an inner loop formula ball screw bearing, axial bearing capacity is strong, possesses limiting displacement.

In order to achieve the above purpose, the utility model provides a following technical scheme: an internal circulation type ball screw bearing comprises a screw, a nut and balls, wherein a first raceway is arranged on the surface of the screw; the nut is provided with a second raceway matched with the first raceway, the balls are positioned in the first raceway and the second raceway, and the axial end part of the nut is provided with an annular boss which is coaxially arranged with the screw rod and is sleeved on the screw rod; and the inner wall of the boss is provided with an external thread matched with the first raceway, and the external thread is in threaded fit with the first raceway.

As a further improvement of the utility model, a clearance is provided between the external thread on the inner wall of the boss and the first raceway.

As a further improvement of the utility model, the end of the screw rod is provided with an inner threaded hole.

As a further improvement, the end side of the screw rod corresponding to the inner screw hole is provided with notches distributed in pairs on both sides.

As a further improvement of the present invention, a position corresponding to the round notch on the screw rod is provided with a position limiting member, the position limiting member is provided with a through hole for penetrating the screw rod, and the through hole is matched with the position shape of the round notch on the screw rod; the nut is provided with the arch corresponding to the one end of locating part, be provided with the stopper on the locating part, this stopper and arch cooperate to restriction nut or lead screw rotate.

The beneficial effects of the utility model, the boss of nut tip can possess the guard action, and the boss can provide the anticollision effect on the one hand, and the screw thread of on the other hand boss inner wall and the cooperation of first raceway can produce axial shock resistance, reduce the damage to the ball to the screw thread can not influence the relative movement between nut and the lead screw with the screw-thread fit of first raceway.

Drawings

Fig. 1 is a schematic view of the nut and screw rod matching structure of the present invention;

FIG. 2 is a schematic view of the left-side view mechanism of the screw rod of the present invention;

fig. 3 is a schematic view of the internal structure of the nut of the present invention.

Reference numerals: 1. a first raceway; 2. a screw rod; 3. a nut; 4. a ball bearing; 5. a second raceway; 6. a boss; 7. an external thread; 8. internally sinking the threaded hole; 9. rounding off; 10. a limiting member; 11. a limiting block; 12. a protrusion; 13. and a through hole.

Detailed Description

The present invention will be described in further detail with reference to embodiments shown in the drawings.

As shown with reference to figures 1-3,

an internal circulation type ball 4 screw 2 bearing comprises a screw 2, a nut 3 and a ball 4, wherein a first raceway 1 is arranged on the surface of the screw 2, the nut 3 is installed on the screw 2, and the ball 4 is arranged inside the nut 3 and matched with the screw 2; a second raceway 5 matched with the first raceway 1 is arranged on the nut 3, the balls 4 are positioned in the first raceway 1 and the second raceway 5, an annular boss 6 is arranged at the axial end part of the nut 3, and the boss 6 is coaxially arranged with the screw rod 2 and is sleeved on the screw rod 2; and an external thread 7 matched with the first roller path 1 is arranged on the inner wall of the boss 6, and the external thread 7 is in threaded fit with the first roller path 1.

In the scheme, the screw rod 2 and the nut 3 rotate relatively, and the nut 3 and the screw rod 2 generate relative displacement by matching with the ball 4. The rotating component can be a nut 3 and also can be a screw rod 2. First raceway 1 and second raceway 5 both cooperate and form the complete raceway that supplies ball 4 to roll, and boss 6 through 3 tip of nut can possess the guard action, and boss 6 can provide the crashproof effect on the one hand, and the external screw thread 7 of 6 inner walls of on the other hand boss can produce axial shock-resistant effect with the cooperation of first raceway 1, reduces the damage to ball 4 to the screw-thread fit of external screw thread 7 and first raceway 1 can not influence the relative movement between nut 3 and the lead screw 2.

Preferably, the external thread 7 on the inner wall of the boss 6 has a clearance with the first raceway 1.

The matching of the thread and the external thread 7 between the first roller path 1 is provided with a certain gap, so that the generation of overlarge resistance can be avoided, and the use effect is poor.

For convenient installation and use, the end part of the screw rod 2 is provided with an inner sunken threaded hole 8. This setting makes things convenient for lead screw 2 to be connected with other parts to the structure is compacter, unnecessary volume can not appear.

Furthermore, the side surface of the end part of the screw rod 2 corresponding to the inner sunken threaded hole 8 is provided with round notches 9 distributed on two sides in pairs. The position of the round notch 9 can provide a spanner acting point, and the inner countersunk threaded hole 8 can be matched with other parts to be more conveniently installed after the spanner clamps the round notch 9.

In addition, a limiting piece 10 is installed on the screw rod 2 at a position corresponding to the round notch 9, a through hole 13 for penetrating the screw rod 2 is formed in the limiting piece 10, and the through hole 13 is matched with the position shape of the screw rod 2 with the round notch 9; the nut 3 is provided with the arch 12 corresponding to the one end of the locating part 10, the locating part 10 is provided with the limiting block 11, and the limiting block 11 is matched with the arch 12 to limit the rotation of the nut 3 or the screw rod 2.

The position of the round notch 9 provides a wrench force application point and simultaneously can generate a circumferential limiting effect on the limiting part 10, the limiting part 10 is prevented from rotating, the limiting part 10 can be circumferentially fixed through the matching of the round notch 9 and a through hole 13 in the limiting part 10, and the limiting part 11 in the limiting part 10 is relatively fixed with the screw rod 2 at the moment. When the nut 3 or the screw rod 2 rotates and the nut 3 rotates in place, the protrusion 12 on the nut 3 abuts against the limiting block 11, and at the moment, the nut 3 is limited to continue moving, which is equivalent to limiting the nut 3 or the screw rod 2 to continue rotating according to the current rotating direction. The limiting part 10 is arranged on the screw rod 2, the structure is compact, and the whole limiting effect is realized, and meanwhile, the overlarge volume increase is avoided.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An internal circulation type ball screw bearing comprises a screw, a nut and balls, wherein a first raceway is arranged on the surface of the screw; the nut is provided with a second raceway matched with the first raceway, and the balls are positioned in the first raceway and the second raceway; and an external thread matched with the first roller path is arranged on the inner wall of the boss and is in threaded fit with the first roller path.

2. The internally recirculating ball screw bearing of claim 1, wherein the external threads on the inner wall of the boss have a clearance from the first raceway.

3. An internally recirculating ball screw bearing as claimed in claim 1 wherein the ends of the screw are provided with internally countersunk threaded holes.

4. The internal circulation type ball screw bearing according to claim 3, wherein the screw corresponding to the end side of the internally countersunk threaded hole is provided with circular notches distributed in pairs at two sides.

5. The internal circulation type ball screw bearing according to claim 4, wherein a position of the screw corresponding to the segment is provided with a limiting member, the limiting member is provided with a through hole for penetrating the screw, and the through hole is matched with the position shape of the segment of the screw; the nut is provided with the arch corresponding to the one end of the locating part, the locating part is provided with the limiting block, and the limiting block is matched with the arch to limit the rotation of the nut or the screw rod.