Ball screw assembly

Abstract

The utility model relates to a ball screw pair, which is used for being matched with a screw body for use, and comprises a first screw pair, a second screw pair and a third screw pair, the first screw pair is provided with a first through hole, the first through hole axially penetrates through the first screw pair, the inner wall of the first through hole is provided with a first spiral convex rib, and the first spiral convex rib protrudes from the inner wall of the first through hole towards the radial direction; the second lead screw pair is provided with a second through hole, the second through hole axially penetrates through the second lead screw pair, a second spiral convex rib is arranged on the inner wall of the second through hole, and the second spiral convex rib protrudes from the inner wall of the second through hole towards the radial direction; the second lead screw pair is further provided with an oil filling hole, the oil filling hole is formed in the outer wall of the second lead screw pair and penetrates through the second lead screw pair, and the oil filling hole communicates with the second through hole. The balls are arranged in grooves formed by the first spiral convex ribs of the first lead screw pair and grooves formed by the second spiral convex ribs of the second lead screw pair; the first lead screw pair and the second lead screw pair are detachably and fixedly connected together.

Description

TECHNICAL FIELD

[0001] The utility model relates to the ball screw field, concretely relates to ball screw pair. BACKGROUND

[0002] Ball screw is usually composed of screw rod and ball screw pair, ball screw pair is screwed into screw rod, and ball screw pair can move on screw rod. The ball screw pair in the prior art is mostly integrally formed, this structure design has its advantages, but inevitably also has some disadvantages. For example, it is impossible to add lubricating oil to the ball screw pair and the screw rod under this structure. For example, the EMB brake system ball screw disclosed in the Chinese utility model patent with the application number CN202421394571.3 comprises a screw nut, a screw rod and balls, the screw nut and the screw rod are respectively provided with first and second grooves, the first and second grooves are matched to form a groove for the balls to move in, the center of the screw rod is provided with an assembly groove for the output end of a driving motor to be inserted, the end of the assembly groove is provided with a clamping groove matched with the output end of the driving motor, and the clamping groove is used for fixing the output end of the driving motor and conducting the driving force provided by the driving motor to the screw rod. The utility model has the advantages that: firstly, the clamping groove is arranged at the end of the assembly groove, so that the output end of the driving motor can be well covered by the assembly groove, thereby reducing the occupied space of the overall structure during use, and secondly, the screw rod is directly connected with the driving motor through the clamping groove, so that the driving force provided by the driving motor can directly act on the screw rod, thereby effectively improving the transmission stability. However, the ball screw provided in the patent cannot add lubricating oil. SUMMARY

[0003] The utility model discloses a ball screw pair to solve the shortcoming in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model discloses a ball screw pair to solve the shortcoming in the prior art.

[0005] The first screw pair has a first through hole, the first through hole is axially through the first screw pair, a first spiral rib is arranged on the inner wall of the first through hole, and the first spiral rib protrudes radially from the inner wall of the first through hole.

[0006] A second screw rod pair has a second through hole axially penetrating the second screw rod pair, and a second spiral protrusion is arranged on the inner wall of the second through hole and protrudes radially from the inner wall of the second through hole; the second screw rod pair is further provided with an oiling hole arranged on the outer wall of the second screw rod pair and penetrating the second screw rod pair, and the oiling hole is in communication with the second through hole;

[0007] and balls arranged in the groove formed by the first spiral protrusion of the first screw rod pair and the groove formed by the second spiral protrusion of the second screw rod pair.

[0008] The first screw rod pair and the second screw rod pair are detachably fixedly connected together.

[0009] In some embodiments of the present application, at least three insertion rods are further included, at least three first insertion holes adapted to the insertion rods are arranged on the end face of the first screw rod pair, at least three second insertion holes adapted to the insertion rods are arranged on the end face of the second screw rod pair, one end of the insertion rod is fixedly inserted into the first insertion hole, and the other end of the insertion rod is fixedly inserted into the second insertion hole, so that the first screw rod pair and the second screw rod pair are detachably fixedly connected together.

[0010] In some embodiments of the present application, the axis of the oiling hole is parallel to the radial direction of the second screw rod pair, the axis of the oiling hole is perpendicular to the axial direction of the second screw rod pair, and the length of the oiling hole is smaller than the diameter of the second screw rod pair.

[0011] In some embodiments of the present application, a preset number of reversers are further included, a preset number of first connecting key grooves radially penetrating the first screw rod pair are arranged on the first screw rod pair, and a preset number of second connecting key grooves radially penetrating the second screw rod pair are arranged on the second screw rod pair; the reverser is adapted to the first connecting key groove and the second connecting key groove, and the reverser is inserted into the first connecting key groove and the second connecting key groove.

[0012] In some embodiments of the present application, a spiral type curved surface is arranged on the reverser, and the spiral type curved surface is adapted to the external thread on the screw rod body.

[0013] In some embodiments of the present application, a notch is arranged on the second screw rod pair, the notch is formed by the fracture of the second spiral protrusion on the second through hole of the second screw rod pair; the oiling hole is in communication with the notch, so that the lubricating oil flows into the notch through the oiling hole, and the lubricating oil in the notch flows into the groove formed by the second spiral protrusion.

[0014] In some embodiments of the present application, the second spiral rib is provided with two sections, and the gap is formed between the two sections, wherein a first opening is arranged on one section, and a second opening is arranged on the other section, the first opening and the second opening constitute a part of the oil hole, and the first opening and the second opening are communicated with the gap, so that the lubricating oil added through the oil hole flows into the gap from the first opening and the second opening.

[0015] The ball screw pair provided by the present application has the advantages that the ball screw pair has a simple structure, the first ball screw pair and the second ball screw pair are detachably fixedly connected, the oil hole is arranged on the second ball screw pair, the lubricating oil added through the oil hole flows into the groove formed by the second spiral rib of the second ball screw pair, and thus the ball can be lubricated. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure diagram of the ball screw pair provided by the present application is shown.

[0017] Figure 2 Another structure diagram of the ball screw pair provided by the present application is shown.

[0018] Figure 3 Another structure diagram of the ball screw pair provided by the present application is shown.

[0019] Figure 4 Another structure diagram of the ball screw pair provided by the present application is shown.

[0020] Figure 5 A structure diagram of the first screw pair of the ball screw pair provided by the present application is shown.

[0021] Figure 6 A structure diagram of the reverser of the ball screw pair provided by the present application is shown. DETAILED DESCRIPTION

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0023] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0024] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0025] Please refer to Figures 1-6 This application provides a ball screw assembly 2, which is used in conjunction with a screw body 1. The ball screw assembly 2 includes:

[0026] The first lead screw assembly 21 has a first through hole, which axially extends through the first lead screw assembly 21. A first helical rib is provided on the inner wall of the first through hole, and the first helical rib protrudes radially from the inner wall of the first through hole.

[0027] The second lead screw assembly 22 has a second through hole axially extending through the second lead screw assembly 22. A second helical rib 222 is provided on the inner wall of the second through hole, and the second helical rib 222 protrudes radially from the inner wall of the second through hole. The second lead screw assembly 22 is also provided with an oiling hole 221, which is provided on the outer wall of the second lead screw assembly 22 and extends through the second lead screw assembly 22. The oiling hole 221 is connected to the second through hole.

[0028] and balls (not shown in the figure) arranged in the groove formed by the first helical ribs of the first screw pair 21 and the groove formed by the second helical ribs 222 of the second screw pair 22;

[0029] The first screw pair 21 and the second screw pair 22 are detachably fixedly connected together.

[0030] In some embodiments of the present application, referring to Figures 1-6 The ball screw pair 2 further comprises at least three insertion rods 24, at least three first insertion holes 211 adapted to the insertion rods 24 are arranged on the end face of the first screw pair 21, at least three second insertion holes 223 adapted to the insertion rods 24 are arranged on the end face of the second screw pair 22, one end of the insertion rod 24 is fixedly inserted into the first insertion hole 211, the other end of the insertion rod 24 is fixedly inserted into the second insertion hole 223, so that the first screw pair 21 and the second screw pair 22 are detachably fixedly connected together.

[0031] In some embodiments of the present application, referring to Figures 1-6 The axis of the oil hole 221 is parallel to the radial direction of the second screw pair, the axis of the oil hole 221 is perpendicular to the axial direction of the second screw pair 22, and the length of the oil hole 221 is less than the diameter of the second screw pair 22.

[0032] In some embodiments of the present application, referring to Figures 1-6 The ball screw pair further comprises a preset number of reversers 23, a preset number of first connection key grooves 210 are arranged on the first screw pair 21, the first connection key grooves 210 pass through the first screw pair 21 in the radial direction; a preset number of second connection key grooves 220 are arranged on the second screw 22, the second connection key grooves 220 pass through the second screw pair 22 in the radial direction; the reverser 23 is adapted to the first connection key groove 210 and the second connection key groove 220, and the reverser 23 is inserted into the first connection key groove 210 and the second connection key groove 220.

[0033] In some embodiments of the present application, referring to Figures 1-6 The reverser 23 is provided with a helical curved surface 230, and the helical curved surface 230 is adapted to the external thread on the screw body 1.

[0034] In some embodiments of the present application, referring to Figures 1-6The second screw rod pair 2 is provided with a gap 224 formed by a second spiral convex rib 222 on a second through hole of the second screw rod pair 2; the oil hole 221 and the gap 224 are communicated, so that the lubricating oil flows into the gap 224 through the oil hole 221, and the lubricating oil in the gap 224 flows into a groove formed by the second spiral convex rib 222.

[0035] In some embodiments of the present application, please refer to Figures 1-6 The second spiral convex rib 222 is provided with two sections, and the gap 224 is formed between the two sections; one of the sections is provided with a first opening 2211, and the other section is provided with a second opening 2212; the first opening 2211 and the second opening 2212 constitute a part of the oil hole 221, and the first opening 2211 and the second opening 2212 are both communicated with the gap 223, so that the lubricating oil is added through the oil hole 221 and flows into the gap 223 from the first opening 2211 and the second opening 2212.

[0036] The ball screw pair structure provided by the present application is simple, the first ball screw pair and the second ball screw pair are detachably fixedly connected, the oil hole is arranged on the second ball screw pair, the lubricating oil added through the oil hole flows into the groove formed by the second spiral convex rib of the second ball screw pair, so that the ball can be lubricated.

[0037] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. Ball screw pair for use in cooperation with a screw body, characterized in that The application relates to a ball screw mechanism. The ball screw mechanism comprises a first screw rod pair, a second screw rod pair and a ball. The first screw rod pair has a first through hole which is axially through the first screw rod pair, and a first spiral convex rib is arranged on the inner wall of the first through hole and protrudes radially from the inner wall of the first through hole. The second screw rod pair has a second through hole which is axially through the second screw rod pair, and a second spiral convex rib is arranged on the inner wall of the second through hole and protrudes radially from the inner wall of the second through hole. An oiling hole is further arranged on the second screw rod pair, the oiling hole is arranged on the outer wall of the second screw rod pair and is through the second screw rod pair, and the oiling hole is communicated with the second through hole.

2. Ball screw pair according to claim 1, characterized in that The ball is arranged in the groove formed by the first spiral convex rib of the first screw rod pair and the groove formed by the second spiral convex rib of the second screw rod pair.

3. The ball screw pair according to claim 1, characterized in that The first screw rod pair and the second screw rod pair are detachably fixedly connected together.

4. The ball screw pair according to claim 1, characterized in that, The first screw rod pair and the second screw rod pair are detachably fixedly connected together through at least three inserting rods.

5. Ball screw pair according to claim 4, characterized in that The axis of the oiling hole is parallel to the radial direction of the second screw rod pair, the axis of the oiling hole is perpendicular to the axial direction of the second screw rod pair, and the length of the oiling hole is smaller than the diameter of the second screw rod pair.

6. The ball screw pair according to claim 1, characterized in that A preset number of reversers are further arranged, a preset number of first connecting key grooves are arranged on the first screw rod pair and are radially through the first screw rod pair, a preset number of second connecting key grooves are arranged on the second screw rod pair and are radially through the second screw rod pair, the reverser is matched with the first connecting key groove and the second connecting key groove, and the reverser is inserted into the first connecting key groove and the second connecting key groove.

7. Ball screw pair according to claim 6, characterized in that A spiral type curved surface is arranged on the reverser, and the spiral type curved surface is matched with the external thread on the screw rod body. A notch is arranged on the second screw rod pair, the notch is formed by the fracture of the second spiral convex rib on the second through hole of the second screw rod pair, the oiling hole is communicated with the notch, so that lubricating oil flows into the notch through the oiling hole, and the lubricating oil in the notch flows into the groove formed by the second spiral convex rib. Two fracture surfaces are arranged on the second spiral convex rib, the notch is formed between the two fracture surfaces, a first opening is arranged on one of the fracture surfaces, a second opening is arranged on the other fracture surface, the first opening and the second opening constitute part of the oiling hole, and the first opening and the second opening are both communicated with the notch, so that lubricating oil is added through the oiling hole and flows into the notch through the first opening and the second opening.

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