WO2014169854A1

WO2014169854A1 - Composite bearing for self-tightening drill chuck

Info

Publication number: WO2014169854A1
Application number: PCT/CN2014/075751
Authority: WO
Inventors: 游奕华; 游友民
Original assignee: You Yihua
Priority date: 2013-04-18
Filing date: 2014-04-18
Publication date: 2014-10-23
Also published as: CN103212736A; CN103212736B

Abstract

A composite bearing for a self-tightening drill chuck. A cylindrical main body (1) is provided in a cylindrical integrated guiding seat (24). The upper part of the cylindrical integrated guiding seat (24) is a cylindrical integrated bearing guide part (4), and the lower part is a conical cylindrical guiding rail part (5) of the gripping jaws. The composite bearing includes a cylindrical shaft seat (10) fixed between the radial of the main body (1) and the integrated bearing guide part (4). The radial inner side of the composite bearing is a centripetal sliding bearing (13), and the lower end of the composite bearing is a thrust bearing (14). The shaft seat (10) is both the bearing bush of the centripetal sliding bearing (13) and the raceway of the thrust bearing (14).

Description

Composite bearing for self-tightening chucks

The invention belongs to the field of mechanical technology and relates to a self-tightening chuck, in particular to a composite bearing for a self-tightening chuck. Background technique

With the development of social productivity, the use of drill chucks is very extensive, and drill chucks are required for bench drills, hand drills or machine tools used in machinery manufacturing, electronics, building installation, home decoration, etc. Hold tools such as drills or knives to work. There are two types of drill chucks available: one is a wrench drill chuck, the clamping force of which depends on the torque applied by the wrench, and requires an auxiliary tool when clamping and unloading the drill bit. Using an auxiliary tool to tighten or loosen the drill chuck to install or remove a drill bit or tool is cumbersome and time consuming; the other is a self-tightening drill chuck. The self-tightening drill chuck is easy to clamp a tool such as a drill or a tool by tightening the drill or tool with the thread after the bit is mounted by the self-tightening principle.

Conventional self-tightening chucks typically include a body, a locking screw, a jaw, a ball, an end cap, a jaw block, an end cap, and a ball cap. The inner surface of the ball cover has an annular step, the main body is a cylinder, and the outer circular surface has an annular shoulder. A ring of balls is distributed between the annular shoulder of the main body and the annular step of the ball cover, and the main body is mounted on the ball. The guide sleeve is formed by splicing the cover and the jaw seat, and the guide sleeve is spliced through the threaded connection of the end cover and the ball cover. There is an end cap at the connecting end of the main body and the external device, which mainly functions to rotate the main body and prevent the ball cover from being separated from the main body.

Obviously, there are obvious defects in the integrity of the existing drill chuck. All the parts depend on the threaded connection of the end cover and the ball cover. When the end cover is lost, the drill chuck is scattered into a single piece. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite bearing for a self-tightening chuck which is reasonable in design, simple in structure, compact in integrity, and capable of supporting a self-tightening chuck body.

In order to achieve the above object, the present invention adopts the following technical solutions: The composite bearing for the self-tightening chuck, the self-tightening chuck comprises a cylindrical body, and the main body is arranged in a cylindrical integrated guide seat. The upper part of the integrated guide seat is a cylindrical integral guide part, and the lower part is a claw-shaped clamp rail part, wherein the composite bearing comprises a cylindrical shaft seat, The shaft seat is fixed between the main body radial direction and the integral guiding portion, the radial inner side of the composite bearing is a radial sliding bearing, and the lower end of the composite bearing is a thrust rolling bearing.

In the above composite bearing for a self-tightening chuck, the radial sliding bearing includes the shaft seat and the integral guiding portion, and the shaft seat is fixed on the integral guiding portion; The thrust rolling bearing includes the shaft seat, a plurality of balls, an annular shoulder disposed on the body, and the integral guide portion, the ball being disposed between the lower end of the shaft seat and the annular shoulder. In the present invention, the integral guide portion is an important component of the two bearings and a key component of the two bearings. Further, the integral guide portion combines the two bearings into a unitary structure.

In the above composite bearing for a self-tightening chuck, the integral guide portion is provided with an annular step, the annular shoulder is located on an outer circular surface of the main body, and the annular shoulder is disposed. On the annular step, the plurality of balls are disposed between the lower portion of the shaft seat and the upper portion of the annular shoulder, and the balls are respectively in contact with the lower portion of the shaft seat and the upper portion of the annular shoulder, and the inner side of the shaft seat is disposed on the outer circumference of the main body a bearing of a radial sliding bearing between the main journal of the surface and the integral guiding portion, wherein the lower end of the shaft seat is a race of the thrust rolling bearing, and the upper part of the annular shoulder is a shaft ring of the thrust rolling bearing.

In the above composite bearing for a self-tightening chuck, the upper end surface of the shaft seat is substantially flush with the upper end surface of the integral guide portion. 3⁄4 ^ ^

In the above composite bearing for a self-tightening chuck, the upper inner portion of the integral guiding portion is provided with a connecting thread segment, and a positioning step is arranged above the connecting thread segment, and the outer side of the shaft seat is provided The shaft seat thread segment is provided with a radially protruding positioning portion above the shaft seat thread segment, and the connecting thread segment is screwed with the shaft seat thread segment, and the positioning portion is embedded in the positioning step.

In the above composite bearing for a self-tightening chuck, the positioning step is tightly fitted with the positioning portion.

In the above composite bearing for a self-tightening chuck, the lower end of the shaft seat has an annular curved race, the upper portion of the annular shoulder has an upper annular plane, and the plurality of balls are arranged in a ring shape. Between the curved raceway and the upper annular plane, and a plurality of balls are in contact with the upper annular plane and the annular curved raceway, respectively.

In the above composite bearing for a self-tightening chuck, at least two process holes are provided on the upper end surface of the shaft seat, and the process holes are symmetrically distributed in the circumferential direction.

In the above composite bearing for a self-tightening chuck, an annular oil reservoir is provided between the upper annular plane and the main journal.

Compared with the prior art, the composite bearing used for the self-tightening chuck has the advantages of reasonable design, simple and compact structure, and the shaft seat is both the bearing of the radial sliding bearing and the seat of the thrust rolling bearing. The seat is tightly coupled with the thread of the integral guiding portion to form a composite bearing with good integrity and rigidity, which can stably support the main body, and has high connection strength and does not cause looseness, between the various components. The connection is stable and reliable. DRAWINGS

1 is a schematic cross-sectional view of a self-tightening drill chuck provided by the present invention.

2 is a schematic view showing a half cross-sectional structure provided by the present invention.

In the figure, the main body 1, the locking screw 2, the clamping jaw 3, the integral guiding portion 4, the jaw rail portion 5, the guide groove 6, the end cover 7, the annular step 8, the annular shoulder 9, the shaft seat 10, the ball 11. Main journal 12, radial sliding bearing 13, thrust rolling bearing 14, connection Description

Threaded section 16, positioning step 17, shaft seat threaded section 18, positioning portion 19, annular curved raceway 20, upper annular plane 21, process hole 22, elastic sleeve 23, integral guide seat 24, annular oil reservoir 25 . detailed description

As shown in FIGS. 1 and 2, the self-tightening chuck includes a main body 1, a locking screw 2, a clamping jaw 3, an end cover 7, a shaft seat 10, a ball 11, a elastic sleeve 23, an integral guide seat 24, and the like. . More specifically, the self-tightening chuck includes a cylindrical body 1 which is disposed in a cylindrical integral guide seat 24, the upper portion of which is a cylindrical overall body The lower portion of the type guide portion 4 is a claw rail portion 5 having a conical cylindrical shape. That is, the integrated guide holder 24 is divided into two functions of the integral guide portion 4 and the jaw rail portion 5, and the integral guide portion 4 and the jaw rail portion 5 are of a unitary structure. The composite bearing for the self-tightening chuck is a component of the self-tightening chuck, and comprises a cylindrical shaft seat 10 fixed between the radial direction of the main body 1 and the integral guiding portion 4, The radial inner side of the composite bearing is a radial sliding bearing 13, and the lower end of the composite bearing is a thrust rolling bearing 14.

The radial sliding bearing 13 includes the axle housing 10 and the integral guide portion 4, and the axle housing 10 is fixed to the integral guide portion 4. The thrust rolling bearing 14 includes the axle housing 10, a plurality of balls 11, an annular shoulder 9 disposed on the main body 1, and the integral receiving portion 4, and the balls 11 are disposed between the lower end of the axle housing 10 and the annular shoulder 9. . Specifically, the integral guide portion 4 is provided with an annular step 8 on the outer circumference of the main body 1, and an annular shoulder 9 is disposed on the annular step 8. The plurality of balls 11 are disposed between the lower portion of the axle seat 10 and the upper portion of the annular shoulder 9 and the balls 11 are respectively in contact with the lower portion of the axle housing 10 and the upper portion of the annular shoulder 9, and the inner side of the axle housing 10 is disposed on the outer circumference of the main body 1. The bearing of the radial sliding bearing 13 between the main journal 12 and the integral receiving portion 4, the lower end of the shaft seat 10 is a race of the thrust rolling bearing 14, and the upper portion of the annular shoulder 9 is a thrust rolling bearing 14 Shaft ring. The upper end surface of the shaft base 10 is substantially flush with the upper end surface of the integral guide portion 4. The lower end of the shaft seat 10 has an annular curved raceway 3⁄4 ^ ^

20, the upper portion of the annular shoulder 9 has an upper annular plane 21, a plurality of balls 11 are disposed between the annular curved raceway 20 and the upper annular plane 21, and a plurality of balls 11 are respectively associated with the upper annular plane 21 and the annular curved raceway 20 contacts.

The upper part of the integral guiding part 4 is provided with a connecting threaded section 16 , and a positioning step 17 is arranged above the connecting threaded section 16 , and the shaft seat 10 is provided with a shaft seat threaded section 18 outside the shaft seat The upper portion is provided with a radially protruding positioning portion 19, and the connecting thread portion 16 is screwed to the shaft seat thread portion 18, and the positioning portion 19 is embedded in the positioning step 17. The positioning step Π is tightly fitted with the positioning portion 19.

In order to facilitate the formation of oil film formation, lubrication, and at the same time to facilitate the storage of dirt, the present invention is provided with an annular oil reservoir 25 between the upper annular plane 21 and the main journal 12. The load bearing oil film herein refers to a bearing oil film formed on the radial sliding bearing 13 and the thrust rolling bearing 14. At least two process holes 22 are provided on the upper end surface of the shaft base 10, and the process holes 22 are symmetrically distributed in the circumferential direction. The process hole 22 facilitates the installation of the elastic sleeve 23, thereby facilitating the operation of the self-tightening chuck.

In the present invention, the axle base 10 is both the bearing bush of the radial sliding bearing 13 and the race of the thrust rolling bearing 14, and is connected and positioned by the tight fit of the axle seat 10 and the integral guiding portion 4, thereby forming a good integrity and rigidity. The composite bearing can stably support the main body 1 and has high connection strength without looseness, and the connection between the various components is stable and reliable.

The specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

Although the body 1, the locking screw 2, the jaw 3, the integral guide 4, the jaw rail portion 5, the guide groove 6, the end cover 7, the annular step 8, the annular shoulder 9, the shaft are used more frequently herein. Seat 10, ball 11, main journal 12, radial sliding bearing 13, thrust rolling bearing 14, connecting thread segment 16, positioning step 17, shaft seat thread segment 18, positioning portion 19, annular curved raceway 20, upper annular plane 21, the process hole 22, the elastic sleeve 23, Instruction manual

The terms “integral guide seat 24”, annular oil reservoir 25, etc., do not preclude the possibility of using other terms. These terms are only used to more easily describe and explain the nature of the invention; any of these additional limitations are inconsistent with the spirit of the invention.

Claims

Claim

A composite bearing for a self-tightening chuck, the self-tightening chuck comprising a cylindrical body (1), the body (1) being disposed in a cylindrical integrated guide seat (24), The upper part of the integrated guide seat (24) is a cylindrical integral guide part (4), and the lower part is a claw-shaped jaw guide part (5), wherein the composite bearing includes a cylindrical shaft seat (10) fixed between the radial direction of the main body (1) and the integral guide portion (4), and the radially inner side of the composite bearing is a radial bearing

(13), the lower end of the composite bearing is a thrust rolling bearing (14).

The composite bearing for a self-tightening chuck according to claim 1, wherein the radial sliding bearing (13) comprises the shaft seat (10) and an integral guide (4) The shaft seat (10) is fixed on the integral guiding portion (4); the thrust rolling bearing (14) comprises the shaft seat (10), a plurality of balls (11), and is disposed on the main body (1) The upper annular shoulder (9), and the integral guide (4), the ball (11) is disposed between the lower end of the shaft seat (10) and the annular shoulder (9).

The composite bearing for a self-tightening chuck according to claim 2, wherein the integral guide portion (4) is provided with an annular step (8), the annular shoulder (9) Located on the outer circumference of the main body (1), the annular shoulder (9) is arranged on the annular step (8), the lower part of the shaft seat (10) and the upper part of the annular shoulder (9) The plurality of balls (11) are disposed therebetween, and the balls (11) are respectively in contact with the lower portion of the shaft seat (10) and the upper portion of the annular shoulder (9), and the inner side of the shaft seat (10) is disposed outside the body (1) a bearing of a radial sliding bearing (13) between the main journal (12) of the face and the integral receiving portion (4), wherein the lower end of the bearing block (10) is a race of the thrust rolling bearing (14), The upper part of the annular shoulder (9) is the shaft of the thrust rolling bearing (14).

The composite bearing for a self-tightening chuck according to claim 1 or 2 or 3, characterized in that the upper end surface of the shaft seat (10) and the upper bearing portion (4) are upper The end faces are substantially flush.

The composite bearing for a self-tightening chuck according to claim 1 or 2 or 3, wherein the integral inner guiding portion (4) has a connecting snail on the upper inner side thereof Claim

The segment (16) is provided with a positioning step (17) above the connecting thread segment (16), the shaft seat (10) is provided with a shaft seat thread segment (18), and the shaft seat thread segment (18) The upper part is provided with a radially protruding positioning portion (19), the connecting thread segment (16) is screwed with the shaft seat thread segment (18), and the positioning portion (19) is embedded in the positioning step (17) .

A composite bearing for a self-tightening chuck according to claim 5, wherein said positioning step (Π) is tightly fitted with the positioning portion (19).

The composite bearing for a self-tightening chuck according to claim 3, wherein the lower end of the shaft seat (10) has an annular curved raceway (20), the annular shoulder (9) The upper portion has an upper annular plane (21), and the plurality of balls (11) are disposed between the annular curved raceway (20) and the upper annular plane (21), and the plurality of balls (11) are respectively upper and upper The annular plane (21) is in contact with the annular curved raceway (20).

A composite bearing for a self-tightening chuck according to claim 7, characterized in that an annular oil reservoir (25) is provided between the upper annular plane (21) and the main journal (12).

The composite bearing for a self-tightening chuck according to claim 1 or 2 or 3, characterized in that the upper end surface of the shaft seat (10) is provided with at least two process holes (22) The process holes (22) are symmetrically distributed in the circumferential direction.