WO2008144965A1

WO2008144965A1 - A new self-locking hand tightened drill chuck

Info

Publication number: WO2008144965A1
Application number: PCT/CN2007/001973
Authority: WO
Inventors: Wenhua Zhou; Qiang Zhao
Original assignee: Zhejiang Sanou Machinery Co., Ltd.
Priority date: 2007-05-30
Filing date: 2007-06-25
Publication date: 2008-12-04
Also published as: CN201091927Y

Abstract

A new self-locking hand tightened drill chuck is disclosed. It has a chuck body(1),a jaw(4), a rotary sleeve(2) axially fixed, nut(3), rear sleeve(6) formed behind the rotary sleeve(2). The jaw(4) is screwed with the nut(3), a groove(21) is located within the back end of said rotary sleeve(2), said drill chuck provides a ring-shaped element(5) at the back of the chuck body(1), said ring-shaped element(5) provides spring leaf(51) which has self-locking part (53) fitted with said groove(21), the rear sleeve(6) has control frame (61) and control frame(62), which respectively control the spring leaf(51) locking or unlocking with groove (21),saidfront surface of the chuck body(1) fitted with fixedly centric gear,said drill chuck provides several planetary gears (7) which engage with the centric gear(ll) between rotary sleeve(2) and chuck body(1), said inner surface of the exterior sleeve provides teeth which engage with planetary gears (7).

Description

A novel self-locking hand tight drilling chuck

The present invention relates to a drill chuck, and more particularly to a drill chuck mounted on a machining apparatus and a power tool such as a drill press or an electric drill. Background technique

In the prior art, the hand drill chuck is provided with a drill body, a jaw, a nut, a rotatable rotary sleeve and a rear sleeve, and the rotary sleeve is axially positioned, and the three jaws are respectively disposed on the drill body. In the three inclined holes, a threaded connection is made between the nut and the clamping jaw, and the rotation of the nut is driven by the rotating sleeve to drive the clamping jaws into and out of the inclined hole to clamp or release the drilling tool. The disadvantages of these drilling chucks are: Under the impact load, the bit clamped by the jaw is easy to loosen or even fall off, and it is difficult to maintain the continuity of the processing. Summary of the invention

The technical problem to be solved by the present invention is to provide a novel self-locking hand-tight drill chuck which is not easy to loose and slip under the impact load. To this end, the utility model adopts the following technical solutions: It comprises a drill body, a clamping jaw, an axially positioned rotating sleeve, a nut, a rear sleeve behind the rotating sleeve, the jaws are screwed with the nut, and the rear end of the rotating sleeve a groove for engaging in self-locking is provided, the drill chuck is provided with a loop-shaped element at a rear portion of the drill body that cannot rotate relative to the drill body, and the stirrup-shaped member is provided with a spring piece participating in self-locking, the spring The piece is provided with a self-locking portion that cooperates with the groove in the rear end of the rotating sleeve; the rear sleeve is rotatable in the circumferential direction, and the front end of the rear sleeve is provided with a control spring piece and a groove in the rear end of the rotating sleeve. Control configuration and control structure for controlling the non-locking engagement state of the spring piece and the groove in the rear end of the rotating sleeve; the front outer surface of the drill body is connected with a stationary sun gear, and the drill chuck is rotating A plurality of planet gears coupled to the nut and coupled to the sun gear are disposed between the sleeve and the drill body, and the inner surface of the sleeve is provided with teeth that cooperate with the planet gears. Due to the technical solution of the present invention, the structure of the invention is reasonable, and can be obtained by the cooperation of the rotating sleeve, the planetary gear and the nut. The clamping force is higher, and the spring piece can be matched with the groove in the rear end of the rotating sleeve through the back sleeve control to realize the self-locking function, so that the bit clamped by the jaw is not easy even under the impact load. Loose and slipped off. DRAWINGS

1 is a half cross-sectional view showing an embodiment of the present invention.

Figure 2 is a cross-sectional view taken along line A-A of Figure 1 in a locked state.

Figure 3 is a cross-sectional view taken along line B-B of Figure 1.

Figure 4 is an exploded view of Figure 1.

Figure 5 is a perspective view of the loop member of the embodiment of Figure 1.

Figure 6 is a perspective view of the back cover of the embodiment of Figure 1.

Figure 7 is a schematic view showing the cooperation of the nut and the planetary gear of the embodiment shown in Figure 1.

Figure 8 is a perspective view of the rotary sleeve of the embodiment of Figure 1. detailed description

Refer to the attached drawings. The invention comprises a drill body 1, a clamping jaw 4, an axially positioned rotating sleeve 2, a nut 3, and a rear sleeve 6 at the rear of the rotating sleeve. The clamping jaw is screwed with the nut, and the rear end of the rotating sleeve is provided with a groove 21 of the lock, the drill chuck is provided at the rear of the drill body with a loop-like element 5 that cannot rotate relative to the drill body, the loop-shaped element being provided with a spring piece 51 participating in self-locking, the spring piece being provided The self-locking portion 53 is matched with the inner groove of the rear end of the rotating sleeve; the rear sleeve is circumferentially rotatable, and the front end of the rear sleeve is provided with a control spring piece and a groove in the rear end of the rotating sleeve. Control structure 61 and control structure 62 for controlling the non-locking state of the groove in the rear end of the rotating sleeve and the rotating sleeve; the front outer surface of the drill body is connected with a stationary sun gear 11, the drill chuck Also disposed between the rotating sleeve and the drill body are a plurality of planet gears 7 coupled to the nut gear and coupled to the nut, the inner surface of the outer casing being provided with teeth 22 that cooperate with the planet gears.

The ring-shaped element 5 can be realized in such a way that it cannot rotate relative to the drill body: as shown in Fig. 5, the inner ring of the ring-shaped element 5 has a rotation stop edge 54, correspondingly, the drill body also has a rotation stop edge 54. The side of the fit. In this embodiment, the self-locking portion 53 of the spring piece is an outward protrusion on the spring piece, and the groove 21 matched with the self-locking portion may be an arc-shaped groove as shown. The self-locking portion of the spring piece may also be a lift of the end of the spring piece, and the groove 21 may be a toothed groove formed by the teeth. The control configurations 62 and 61 employ grooves, as shown, the H-slot used in the control configuration 61 is between the groove bottom and the centerline of the drill chuck as compared to the groove used in the control configuration 62. The distance is even greater.

In this embodiment, the direction of rotation of the clamping workpiece is a positive direction, and the control configuration of the corresponding non-locking engagement state is in the opposite direction of the control configuration corresponding to the locking engagement state. In this way, when the drill chuck is operated, it is convenient to hold the rear sleeve to operate the rotary sleeve, which is more convenient to use.

The ring-shaped member is provided with a key 52 having a rotation limit function which is lifted toward the rear sleeve, and the rear sleeve is provided with a limiting hole or groove 63 which cooperates with the key. The cooperation of the key 52 and the limiting hole 63 can restrict the rotation of the rear sleeve, so that the rear sleeve can only rotate between the locking position and the non-locking position, which is advantageous for controlling the self-locking operation and the self-locking operation. If the key 52 is tilted in the radial direction of the drill chuck, it can also serve as an axial limit for the back sleeve.

In this embodiment, the rear sleeve can be installed at the rear end of the drill body in the following manner: The rear cover has a rear cover 64, and the rear cover is axially positioned on the step at the rear end of the drill body through the collar 93. . The key 52 provided by the loop member can be tilted toward the back cover of the back cover, and the limit hole 63 or the groove is provided on the back cover.

The sun gear 11 may be a ring of teeth directly formed on the surface of the drill body and connected to the drill body in an integral manner, and the sun gear 11 may also be a separate component connected to the drill body.

The central shaft 71 of the planetary gear 7 is connected to the nut, and thereby the connection of the planetary gear 7 and the nut is realized. As shown, the nut is provided with a mounting groove 31 of the planetary gear and its central axis, The planetary gear and its central shaft are mounted thereto, and the mounting groove is vacant with respect to the portion of the gear such that the planetary gear can be coupled to the teeth 22 of the inner surface of the outer casing and to the sun gear. The planetary gears can also be mounted on a carrier that is coupled to the nut and thereby connects the planetary gear 7 to the nut. The nut may also be provided with teeth that cooperate with the planet gears to achieve connection with the planet gears.

In the present invention, the number of the planetary gears is three, and is uniformly disposed along the circumferential direction of the drill chuck.

Reference numeral 91 is a bearing, and reference numeral 92 is a washer which is located between the nut and the nut step behind the nut. Reference numeral 94 is a collar that is coupled to the drill body and defines a rotating sleeve at the front end. After rotating the sleeve The axial definition of the end can be achieved by the cooperation of the rotating sleeve with the nut or the back sleeve. Reference numeral 95 is a nut sleeve. When the tool is clamped, the rotating sleeve is twisted, and the tooth 22 drives the planetary gear to move circumferentially on the surface of the sun gear, thereby driving the nut to move, clamping the tool, and inputting a larger torque, so that the drill chuck has a larger clip. Tight force.

When clamping the tool, the rotating sleeve is rotated clockwise from the front end of the drill chuck, and the nut is rotated to clamp the jaws; the side wall of the rear sleeve limiting hole is closely attached to the key 52, which is a counterclockwise rotation trend. At this time, the self-locking portion 53 is in the recess 72 and is in a disengaged state from the recess 21, and the drill chuck is in a non-locking state. After the tool is clamped, the sleeve is rotated clockwise to the other side wall of the rear sleeve limiting hole to be in close contact with the key 52, and the self-locking portion 53 is turned into the groove 61 and falls into the groove 21, thereby realizing the self-locking lock. tight. In the locked state, even if the drill chuck is subjected to an impact load, the nut does not loose relative to the drill body due to the engagement of the self-locking portion 53 and the recess 21, and the jaws maintain the clamped state of the tool. When the tool is to be removed, the back sleeve is rotated counterclockwise to disengage the self-locking portion 53 from the recess 21, and the rotating sleeve can be rotated to release the jaws.

Claims

Claim

1. A novel self-locking hand-tight drill chuck comprising a drill body, a jaw, an axially positioned rotary sleeve, a nut, a rear sleeve behind the rotary sleeve, a jaw and a nut threaded connection, characterized in that said rotation The rear end of the sleeve is provided with a groove for participating in self-locking, and the drill chuck is provided with a loop-shaped member at a rear portion of the drill body that cannot rotate relative to the drill body, and the loop-shaped member is provided with a spring piece participating in self-locking The spring piece is provided with a self-locking portion that cooperates with the inner groove of the rear end of the rotating sleeve; the rear sleeve is circumferentially rotatable, and the front end of the rear sleeve is provided with a control spring piece and a groove at the rear end of the rotating sleeve a control configuration of the locking engagement state and a control configuration for controlling the non-locking engagement state of the groove in the rear end of the spring piece and the rotating sleeve; the front outer surface of the drill body is connected with a stationary sun gear, the drill The collet further has a plurality of planet gears coupled to the nut that are coupled to the sun gear between the rotating sleeve and the drill body, and the inner surface of the outer sleeve is provided with teeth that cooperate with the planetary gears.

2. A novel self-locking hand-tight drill chuck according to claim 1, wherein the ring-shaped member is provided with a key having a rotation limit function which is lifted toward the rear sleeve, and the rear sleeve is provided. A limiting hole or slot that cooperates with the key.

3. A novel self-locking hand-tight drill chuck according to claim 2, wherein said rear sleeve has a rear cover, said rear cover being axially positioned at a rear end of the drill body, said loop member The provided button is tilted toward the back cover of the back cover, and the limit hole or slot is provided on the back cover.

4. A novel self-locking hand-tight drill chuck according to claim 1, wherein the self-locking portion of the spring piece is an outward projection on the spring piece, and the control configuration is a groove.

5. A novel self-locking hand-tight drill chuck according to claim 1, 2, 3 or 4, characterized in that the direction of rotation of the clamping workpiece is positive, and the control of the corresponding non-locking cooperation state is provided. The configuration is in the opposite direction of the control configuration corresponding to the locked-fit state.

6. A novel self-locking hand drill chuck according to claim 1, wherein said nut is provided with a mounting groove of a planetary gear and a central shaft thereof, said planetary gear and its central shaft being mounted thereto The mounting groove is vacant with respect to the portion of the gear.

7. A novel self-locking hand-tight drill chuck according to claim 1, wherein the number of said planetary gears is three and is evenly arranged along the circumference of the drill chuck.