WO2007097313A1

WO2007097313A1 - Rotation output device

Info

Publication number: WO2007097313A1
Application number: PCT/JP2007/053062
Authority: WO
Inventors: Daijiro Nakamura
Original assignee: Muratechnology Co., Ltd.
Priority date: 2006-02-20
Filing date: 2007-02-20
Publication date: 2007-08-30
Also published as: JP4864481B2; JP2007218411A

Abstract

[PROBLEMS] To provide a lock mechanism which can lock an output shaft surely through rotation of the output shaft by a user after rotation of an input shaft is stopped, and of which the entirety can be constituted compactly. [MEANS FOR SOLVING PROBLEMS] The rotation output device comprises a reversing mechanism (40) for transmitting rotation of a spindle (3) to a control ring (43) while reversing the rotation. The reversing mechanism (40) comprises a steel ball (42b) touching both an outer ring (42a) rotating integrally with the control ring (43) and an inner ring (42c) rotating integrally with the spindle (3), and a fixed gauge (41) for holding the position of the steel ball (42b) in the circumferential direction. A lock mechanism for guiding a float gear (34) located on radial inner side to the radial outer side by rotation from the spindle (3) is constituted of the guide groove (43a) in the control ring (43) and a coil spring (35).

Description

Specification

Rotation output device

Technical field

[0001] The present invention relates to a rotation output device capable of locking an output shaft of an electric tool such as an electric screwdriver after the motor is controlled to stop and the output shaft is stopped.

Background art

Conventionally, an electric tool having a lock function for locking an output shaft (spindle) when a motor is controlled to stop is known (see Patent Document 1).

The lock mechanism described in Patent Document 1 has a free angle between the output shaft and the input shaft, is urged outward (in the locking direction), and engages and locks the fixing member. A plate and a holding plate that restrains the position of the lock plate by a guide groove are provided on the output shaft side.

[0003] In this locking mechanism, when the input shaft rotates (drives), the holding plate restrains the lock plate in the radially inward position, so that the output shaft is not locked and can be freely moved. When the rotating force motor stops and the input shaft stops, the output shaft rotates by the play angle due to inertia, so that the lock plate linked to the input shaft moves through the guide groove of the holding plate. By moving in the radially outward direction, the output shaft is automatically locked.

[0004] Thus, according to the locking mechanism of Patent Document 1, the output shaft is immediately locked using the inertia when the motor is stopped, so that after the stop, the user performs a rotation operation for the play angle. There is no need, and workability is extremely improved.

However, the locking mechanism using the inertia of Patent Document 1 has the following problems.

It is a problem that the automatic lock is not applied in the case where the “rotation due to inertia” does not occur sufficiently, such as when the motor stops at a low rotation speed.

[0006] In this case, when the user rotates the output shaft in the same direction as the previous rotation direction, the output shaft is rotated in the same direction as the “rotation by inertia”. Lock However, when the output shaft is rotated in the opposite direction, the input shaft also rotates together, so there is no relative displacement between the lock plate and the input shaft, and there is a problem that the lock is not applied at all. Arise.

[0007] As described above, unless the output shaft is locked, the function as a locking mechanism cannot be achieved. In addition, since there is no lock, the user has to turn the output shaft under the load of stopping the motor for a long period of time. Arise.

[0008] With respect to this problem, Patent Document 1 adds a new lock operation mechanism using a planetary gear set, so that the output of the output shaft in any direction is always the same as that of the lock plate. The output shaft is configured so that relative displacement occurs between the input shaft and the output shaft is locked.

[0009] When such a lock operation mechanism is newly added, a planetary gear set and a complicated mechanism are separately required, and the reliability and durability of the lock mechanism itself may be deteriorated. In addition, the installation space for such a lock operating mechanism is newly required, and there is a problem that the entire lock mechanism cannot be configured compactly.

Patent Document 1: Japanese Patent Application Laid-Open No. 11 37187

Disclosure of the invention

Problems to be solved by the invention

[0011] According to the present invention, after the rotation of the input shaft is stopped, the output shaft is reliably locked by the rotation of the output shaft by the user, and the rotation output includes a lock mechanism that can be configured compactly as a whole. An object is to provide an apparatus.

Means for solving the problem

[0012] The present invention is a rotary input body for inputting rotational driving force, and the rotational input body is disposed on the same axis as the rotational input body, and rotates by receiving the driving force of the rotational input physical force with a predetermined play angle. Rotation output means for outputting force, a fixing member disposed on the outer peripheral portion of the rotation output means and fixed in rotation, and a movement lock plate for engaging and fixing to the fixing member by moving radially outward An urging body that urges the moving lock plate to the radially outward side, guiding means for guiding the movement of the moving lock plate to the radially outward side, and reversing the rotation of the rotation output means to means And a reversing mechanism configured to include a rolling element that is in contact with both the guiding means and the rotation output means, and a rolling element holding portion that holds a circumferential position of the rolling element. And a release mechanism for releasing the engagement and fixation with the fixing member by guiding the movable lock plate to the radially inner side by rotation from the rotation input body side, and by rotating from the rotation output means The lock mechanism for guiding the movable lock plate on the radially inward side to the radially outward side is composed of the reversing mechanism, the guiding means, and the biasing body.

It is a rotation output device.

The contact includes a point contact or a line contact.

[0013] Thereby, the reversing mechanism transmits the rotation from the rotation output means by reversing it to the guiding means, and the movement lock is released from engagement and fixation with the fixing member on the radially inner side. The plate can be brought into a locked state in which the guide is guided by the guide means, and the movable lock plate from which the biasing body is guided is moved radially outward to engage and fix the fixed member.

In addition, with the rotation of the rotational input body side force that inputs the rotational driving force, the movable lock plate can be automatically guided to the radially inner side to release the engagement and fixation with the fixing member to be in the released state. .

[0014] Further, the reversing mechanism is constituted by a rolling element that contacts both the guiding means and the rotation output means, and a rolling element holding portion that holds the circumferential position of the rolling element. The rotation of the rotation output means can be reliably reversed and transmitted to the guidance means by the respective rolling resistances of the rolling element, the guidance means and the rotation output means.

[0015] In addition, the reversing mechanism is constituted by a rolling element that contacts both the guiding means and the rotation output means, and a rolling element holding portion that holds the circumferential position of the rolling element. While the rotation output means of the rotational input physical force is rotating, the reversing mechanism transmits the rotational force in the opposite direction to the rotation of the rotation output means by the reversing mechanism. The rolling element can be slid and rotated.

[0016] Therefore, during rotation of the rotation output means from the rotary input body, the movable lock plate that is guided radially inward by the release mechanism and released from being engaged with the fixing member is released on the radially inward side. The rotation output means can be rotated while being reliably maintained in the state.

As an aspect of the present invention, a plurality of the rolling elements can be provided in the circumferential direction. Thereby, the rotation of the rotation output means can be reliably transmitted to the guiding means. Therefore, the load on the rolling element that reverses the rotation of the rotation output means and transmits it to the guiding means is reduced, and the durability of the reversing mechanism can be improved.

[0018] As an aspect of the present invention, the rolling element can be formed of a sphere.

As a result, the strength due to the shape of the rolling elements can be improved, and a durable reversing mechanism can be configured. Further, since the rolling element comes into contact with both the guiding means and the rotating output means, the guiding means for sliding and rotating the rolling element together with the rotating output means during rotation of the rotating output means for rotating input body force. The sliding resistance can be reduced. Therefore, it is possible to reduce the loss of rotational force as much as the rotational input physical strength. In addition, the rotational load of the rotation output means for guiding the movable lock plate in the radially outward direction can be reduced, and the satisfaction of the user can be improved.

[0019] Further, as an aspect of the present invention, rolling element loose fitting grooves that are loosely fitted to the rolling element holding part and are arranged at equal intervals in the circumferential direction and an attaching part that is attached to the fixing member are provided in the rolling element holding part. Can be provided.

As a result, the rolling holding portion can be fixed to the fixing member, and the rolling element is loosely fitted in the rolling element loose fitting groove by the rolling holding member fixed to the fixing member, and is held at equal intervals in the circumferential direction. can do. Therefore, the position of the rolling element in the circumferential direction can be reliably held, and the rotation of the rotation output means can be reliably reversed and transmitted to the guiding means.

[0020] Further, as an aspect of the present invention, the rotation output means includes a rotation output body and an output body side contact portion that rotates integrally with the rotation output body, and the guide means includes the guide section and the guide. The rolling element, the output body side contact part, and the guide part side contact part can be configured as an assembly.

By configuring the output body side contact, the guide section side contact section, and the rolling element as an assembly as described above, the assembly accuracy of the reversing mechanism can be improved, and the rolling element is connected to the guide means and the rolling element. It is possible to reliably contact both of the rotation output means. Further, since the rolling element can be assembled to the assembly, the rotation output device can be easily assembled. In addition, the rolling elements can be replaced by replacing the assembly, which is convenient for the user. Will increase.

[0022] Further, as an aspect of the present invention, the reversing mechanism can be provided with preloading means for increasing the contact pressure of the rolling element with the guide portion side contact portion and the output body side contact portion. As a result, the rolling element can be further insulted to both the guiding means and the rotation output means.

[0023] Further, as an aspect of the present invention, the preload means can be made of an elastic material.

Thereby, the contact pressure of the rolling element with the said guidance part side contact part and the said output body side contact part can be easily increased by using the elastic material which has an appropriate elastic force.

[0024] Further, as an aspect of the present invention, the movement lock plate is provided with an engaging convex portion, the guiding means is constituted by a guiding groove with which the engaging convex portion engages, and the release mechanism is configured with the engaging mechanism. It is composed of a release groove that engages with the convex part.

As a result, the release mechanism and the guiding means are each formed by a groove.

Compared with the case where the release mechanism and the guiding means are configured by providing separate members, a compact rotation output device can be configured.

[0025] Further, as an aspect of the present invention, a loose fit between the movement lock plate and the rotation output body that allows the movement lock plate and the rotation output body at a radially inner position to be relatively rotatable. And a fitting groove into which the movable lock plate located at the radially outward position and the rotary output body are fitted.

[0026] By forming the loose fitting portion in this manner, it is possible to prevent the rotation of the rotation output body from being obstructed at the radially inner position where the engagement between the fixed member and the movable lock plate is released. Even when the rotation output means and the rotation output means rotate together without any play angle, the movable lock body can surely obtain a function without rotating together.

In addition, since the fitting groove is formed, the movement lock member and the rotation output means that are engaged and fixed to the fixing member at the radially outer side position where the fixing member and the movement lock plate are engaged with each other. Since it fits, a rotation output body can be fixed to a fixed member via a movement lock member, and a function can be obtained reliably.

[0028] Further, as an aspect of the present invention, a guide holding plate fixed to the rotation output means and rotated together with the rotation output body is provided, and a plurality of the movement lock plates provided in the circumferential direction are integrated. It can be held on the guide holding plate so as to rotate in a general manner.

As a result, since the plurality of movable lock plates are engaged and fixed with the fixing member, the rigidity at the engagement portion is increased, the lock torque at the time of locking can be increased, and a reliable and stable lock function is obtained. be able to.

[0029] As an aspect of the present invention, the rotation output body includes a fitting portion that fits into the fitting groove, and the movable lock plate includes a surrounding portion that surrounds the fitting portion, A fitting groove is provided on the inner peripheral side of the surrounding portion on the opposite side of the movement direction on the radially outer side of the movement lock plate, and two movement lock plates are arranged on the axis of the rotary output body in the movement direction. They can be placed in a symmetrical position and orientation with respect to the heart.

[0030] Thereby, the rotation output body and the movement lock member are fitted and fixed by fitting the fitting portion and the fitting groove in such a manner that the rotation output body is sandwiched from two directions that are symmetrical with respect to the axis. Therefore, the rotation output body can be stably fixed to the fixing member via the movement lock member.

[0031] Further, the rotation output device of the present invention can be used in an apparatus that requires rotation output, in addition to being interposed in the output system of the electric tool.

Thereby, operation at the time of locking of an electric tool etc. can be performed very easily. The invention's effect

[0032] According to the present invention, after the rotation of the input shaft is stopped, the output shaft can be reliably locked by the rotation of the output shaft by the user, and the entire structure can be made compact.

Brief Description of Drawings

FIG. 1 is a side view of an electric tool that employs a rotation output device.

FIG. 2 is a rear view of the rotation output device attached to the gear case.

FIG. 3 is an explanatory diagram illustrating the front and side surfaces of each component of the lock mechanism in the rotation output device.

FIG. 4 is an exploded perspective view of each component of the lock mechanism in the rotation output device.

[Fig. 5] Front view of the output gear.

[Fig. 6] Front view of the output ring.

FIG. 7 is an explanatory diagram of the float gear. 圆 8] Explanatory drawing explaining each state of the float gear.

FIG. 9 is an exploded perspective view of each component of the reversing mechanism.

圆 10] An explanatory view explaining the reversing mechanism in a state assembled to the lock mechanism.

FIG. 11 is a front view of the chuck side force of the output gear in the locked state.

FIG. 12 is a front view from the chuck side of the control ring in the locked state.

FIG. 13 is a front view from the chuck side of the bearing in the locked state.

FIG. 14 is a front view from the chuck side of the output gear in a state where it is rotated to the left.

[Fig.15] Front view of the chuck side force of the output gear when rotated further | 8 ° counterclockwise.

FIG. 16 is a front view of the chuck side force of the bearing in a rotating state driven by a motor.

FIG. 17 is a front view of the chuck side force of the control ring in a rotation state driven by a motor.

FIG. 18 is a front view from the chuck side of the output gear in a state where it is rotated clockwise by rotation from the spindle side.

FIG. 19 is a front view from the chuck side of the control ring in a state where it is rotated counterclockwise by rotating the spindle side clockwise.

FIG. 20 is an exploded explanatory view showing both front and side surfaces of each component of the lock mechanism in the rotation output device according to another embodiment.

21] An exploded perspective view of each component of the reversing mechanism in another embodiment.

圆 22] Explanatory drawing explaining the inversion mechanism of the state assembled | attached to the lock mechanism part in another Example.

Explanation of symbols

3 ... Spin Donore

3f ... notch

10 ··· Rotary output device

31 ... Output gear

31c… Pin insertion hole

32 ... Output ring

33 ··· Lock ring 34 Float gear

34e ... Ring part

34f ... engaging pin

34i ... Fitting fixing groove

34j… Free fitting part

35 ... Coil spring

36

40 ... Reversing mechanism

41 · · · Fixed gauge

41b ... Free fitting recess

42 ··· Bearings

42a ... Watering

42b ... Steel balls

42c, 42 'c ... inner ring

43 ··· Control ring

43a… Guiding groove

44 · · · Backup ring

α ... play angle

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a power tool that employs the rotation output device of the present invention. As shown in FIG. 1, the electric power tool includes a housing 1 having a handle portion la to be gripped by a user during use, a power cord 2 provided at a lower portion of the handle portion la, a spindle 3 provided in front of the housing 1, and its spin. A chuck 4 mounted on the cylinder 3 and a drill bit 5 supported by the chuck 4 are provided.

[0036] The housing 1 described above includes a main body case portion 11 and a gear case 12 that is mounted in front of the main body case portion 11. Inside the housing 1, a motor M that can select forward rotation and reverse rotation is selectable. And a rotational output device 10 (see FIG. 2) described later, and the rotational driving force of the motor M is transmitted to the spindle 3 through the rotational output device 10. A switch handle 6 for inputting a drive signal of the motor M is provided above the front surface of the handle portion la of the housing 1.

[0037] In the present embodiment, a general power tool with a cord will be described. However, the invention itself may be a battery-type hand-type power tool that is not a power tool with a limited power source. . In addition, the installation tool may be a screwdriver, a grinder or a router. Further, the drive source may be not only electric but also compressed air or hydraulic drive.

Next, the rotation output device 10 for the electric tool will be described with reference to FIG. The rotation output device 10 includes a lock mechanism 1 OA for transmitting and outputting the rotation output from the output shaft Ml of the motor M and locking and releasing the spindle inside the gear case 12.

[0039] As shown in Fig. 2, the output shaft Ml is arranged so as to be in the direction of about 7 o'clock in the rear view with respect to the spindle 3 (lower left in Fig. 2), and the output shaft Ml is driven to rotate by the output gear. The outer gear of the input gear M2 for transmitting to 31 and the output gear 31 may be constituted by either a helical gear or a spur gear.

As shown in FIG. 3, the lock mechanism portion 10A includes an output gear 31 that receives the rotational driving force of the output shaft Ml, and a lock ring 33 that fixes the lock mechanism portion 10A to the gear case 12. The two float gears 34 (34a and 34b) arranged symmetrically with the inner peripheral surface gear of the lock ring 33 and the float gear 34 are sandwiched from the front and rear in the axial direction and fixed to the spindle 3 And two output gears 32 (32a, 32b).

In the following description of the present specification, the axial direction is referred to as the front-rear direction.

[0041] FIG. 3 is an exploded explanatory view showing the front and side surfaces of each component of the lock mechanism portion 10A of the rotation output device 10 from the chuck side, and an exploded perspective view of each component of the lock mechanism portion 10A. A detailed structure of the lock mechanism portion 10A will be described with reference to FIG.

[0042] As shown in FIG. 3, the lock mechanism 10A is arranged from the chuck side at a fixed plate 36, a fixed gauge 41, a bearing 42, a control ring 43, a chuck side output ring 32b, and vertically symmetrical positions. Two float gears 34 (34a, 34b), two coil springs 35 attached to the two float gears 34, a motor side output ring 32a, and an output gear 31 are provided. Each element except for 35 is formed in a ring shape, Arranged on a concentric axis.

[0043] The spindle 3 is viewed from the chuck 4 side (Fig. 1) in front view substantially inscribed in a chuck shaft mounting portion 3a and a circle having a diameter of about 1.5 times the diameter of the chuck shaft mounting portion 3a. Hexagonal hexagonal cross section 3b and shaft stopper that has the same diameter as the chuck shaft mounting part 3a and is supported by a bearing (not shown) provided inside the front of the gear case 12 (Fig. 2). 3c and a small judgment surface connecting portion 3d having a small judgment surface (a cross section having a straight line portion having a diameter equal to or less than a parallel diameter across the center of the circle) smaller than the chuck shaft insertion portion 3a. A shaft stop portion 3e that is supported by a bearing (not shown) having a diameter about half that of the chuck shaft insertion portion 3a and provided near the center of the gear case 12 is arranged in this order. .

In addition, a notch portion 3f into which a fitting fixing groove 34i of a float gear 34 described later is fitted is provided slightly on the chuck side from the center in the length direction of the small judgment surface connecting portion 3d.

[0044] As shown in Fig. 3, the output gear 31 has a diameter about three times as large as the small judgment surface connecting portion 3d and an appropriate thickness, and has a tooth 3 la having an appropriate tooth height on the outer peripheral portion. Spur gear formed. A shaft through hole 31b loosely fitted to the small judgment surface connecting portion 3d at the center of the output gear 31 as viewed from the front, and a latch provided at the center of the float gear 34 described later at a position facing the shaft through hole 31b. And a pin insertion hole 31c for inserting the stop pin 34f. The output gear 31 should be a helical gear.

In the front view of the output gear 31, the teeth of the spur gear are simplified and the teeth 31a are shown as circles.

[0045] The shaft through hole 31b is formed by a small judgment surface connecting portion 3d loosely fitted with a play angle oc (see FIG. 5), and a top surface and a bottom surface symmetrical with respect to the center are formed in an arc that protrudes outward. It is a zigzag shape when viewed from the front. Further, the pin insertion hole 31c has a substantially isosceles triangular shape in front view formed by continuously arranging circles having a diameter slightly larger than the locking pin of the float gear 34 in three directions, and 1 Z4 of the output gear 31. It is a groove having a certain depth, and is arranged in a convex shape on the radially outward side.

[0046] It should be noted that the center interval of the left and right radial inner circular arc portions formed on the bottom side of the substantially isosceles triangle is twice the play angle α + j8, which is the sum of the play angle a and the play angle β. The width corresponds to the relative movement of the locking pin.

In addition, an outer diameter central arc portion that is a substantially isosceles triangular apex portion of the pin insertion hole 31c When the locking pin is fitted, the float gear 34 is in the out-of-diameter rotation fixed position for engaging and fixing with the lock ring 33. When the locking pin is fitted to the inner diameter circular arc portion on the left and right sides of the bottom side of the pin insertion hole 31c, the float gear 34 engages with the lock ring 33 at the inner diameter fixed release position. is there.

Further, the pin insertion hole 31c may be formed as a hole penetrating the output gear 31.

[0047] The motor-side output ring 32a has a substantially oval shape having a diameter slightly smaller than the outer shape of the output gear 31 and an appropriate thickness, and is formed by folding back to the chuck side in the vicinity of the center of the side straight portion. A fitting latch 32c, a shaft through hole 32d having the same shape as the cross section of the small judgment surface connecting portion 3d at the center, and a central pin through hole 32e at a position corresponding to the pin insertion hole 31c are provided.

The fitting latch 32c is fitted into a fitting hole 32f of a chuck side output ring 32b described later.

[0048] Further, the center pin through hole 32e is provided with a circle having a diameter slightly larger than that of the locking pin of the float gear 34 in three directions. It is a shape having circular arcs in three directions continuously formed by connecting a circle with a length straight line of about 1Z4 radius in the circle in the radial direction of the central pin through hole 32e (see FIG. 7).

The center distance between the left and right radial inner arcs formed on the bottom side of the three-direction arcs is a width corresponding to twice the play angle β.

[0049] Similarly to the pin insertion hole 31c described above, when the locking pin is fitted to the outer central arc portion on the outer diameter side of the three-direction arcs of the central pin through hole 32e, the float The gear 34 is in an outer-diameter rotation fixed position for engaging and fixing with the lock ring 33, and when the locking pin is fitted to the inner radial arc portion on the left and right sides of the bottom side of the central pin through hole 32e, Reference numeral 34 denotes an in-diameter fixed release position where the engagement and fixation with the lock ring 33 are released.

[0050] In addition, an appropriate width of the outer peripheral portion of the shaft through hole 32d is projected to the chuck side so as to be thicker than the other portions of the output ring 32. Specifically, the outer peripheral portion of the shaft through hole 32d is formed with a thickness of about 1.3 times the thickness of the other portions.

[0051] The float gear 34 includes an upper float gear 34a and a lower float gear 34b.

Each float gear 34 has a plate portion 34 provided with a mating portion 34d composed of three convex teeth that mesh with the inner gear 33a of the lock ring 33 at the apex of the arc-shaped portion projecting radially outward. c and a ring portion 34e surrounding the outer peripheral side of the small judgment surface connecting portion 3d of the spindle 3.

[0052] In the vicinity of the center of the plate portion 34c in the front width direction and the height direction, an engagement pin 34f that penetrates the front and back of the plate portion 34c, and a chuck side to be described later on the chuck side surface of the plate portion 34c on both sides thereof. Engagement projections 34g that engage with the side pin through holes 32g of the output ring 32b are provided, and coil springs 35 are loosely fitted on both lower sides of the ring part 34e on the lower end side of the plate part 34c. It has a spring mounting part 34h.

[0053] The plate portion 34c is formed to be twice as thick as the ring portion 34e, and the upper float gear 34a has the ring portion 34e disposed at the motor side position in the front-rear direction of the plate portion 34c, so that the lower side In the float gear 34b, the ring portion 34e is arranged on the chuck side in the axial direction of the plate portion 34c, and the plate portion 34c and the ring portion 34e are integrally formed. Further, a notch 34k corresponding to the outer shape of the lower end of the other ring portion 34e is formed at the lower end in the width direction of the plate portion 34c on the side where the ring portions 34e are not arranged.

[0054] Note that the engaging pin 34f is formed to have a length protruding from the front and back surfaces of the plate portion 34c by about twice the thickness of the plate portion 34c, and is fixed to the plate portion 34c.

The protrusion length of the engagement pin 34f can be engaged with the guide groove 43a of the control ring 43 and the pin insertion hole 31c of the output gear 31 when the float gear 34 is assembled to the lock mechanism 10A. It is a length that can be stopped.

[0055] Further, the engaging convex portion 34g is formed to have a protruding length that is about half the length of the engaging pin 34f, and is locked to the side pin through hole 32g when assembled to the lock mechanism portion 10A. If it is formed longer than this, it will hinder the rotation of the control ring 43 described later.

[0056] Further, since the engaging protrusion 34g only needs to perform the same operation and the same action as the engaging pin 34f, the engaging protrusion 34g does not have to be formed by protruding part of the float gear 34 as in the present embodiment. Joint pin 34 ^ Similarly, the pin may be fixed to the float gear 34.

[0057] Further, on the plate portion 34c side on the inner peripheral side of the ring portion 34e, a loose fitting portion 34j in which the small judgment surface connecting portion 3d is loosely fitted with a predetermined play angle, and on the opposite side of the plate portion 34c. Includes a fitting fixing groove 34i that fits and fixes the small judgment surface connecting portion 3d by fitting with the cutout portion 3f of the small judgment surface coupling portion 3d. [0058] As shown in Figs. 7 and 8, the upper float gear 34a and the lower float gear 34b configured as described above are arranged such that their ring portions 34e overlap each other in the front-rear direction, and the spring Attach the coil spring 35 to the mounting part 34h and assemble it to the lock mechanism 10A.

Accordingly, the upper float gear 34a and the lower float gear 34b move between the radially inner side and the radially outer side in such a manner that they slide in the radial direction at the respective ring portions 34e.

FIGS. 8 (a) and 8 (b) show a front view and a side view of the upper float gear 34a and the lower float gear 34b. FIGS. 8 (c) and 8 (d) A front view and a side view of the upper float gear 34a and the lower float gear 34b that are assembled to the lock mechanism portion 10A and are in the outside rotation fixed position are shown, and FIGS. 8 (e) and 8 (f) A front view and a side view of the upper float gear 34a and the lower float gear 34b in the in-diameter fixed release position are not shown.

[0060] When the upper float gear 34a and the lower float gear 34b are moved to the lock position where the engagement portion 34d is engaged with the inner gear 33a of the lock ring 33 on the radially outer side by the biasing force of the coil spring 35. (Refer to Fig. 7 (a), Fig. 8 (c), Fig. 8 (d)), the fitting fixing groove 34i of the upper float gear 34a and the lower float gear 34b is connected to the notch 3f of the small judgment surface connecting portion 3d. Fit so that it is pinched from both the top and bottom sides.

[0061] On the contrary, the upper float gear 34a and the lower float gear 34b are opposed to the urging force of the coil spring 35, and the engagement between the engagement portion 34d and the inner gear 33a of the lock ring 33 is eliminated on the radially inner side. (See Fig. 7 (b), Fig. 8 (e), Fig. 8 (f)), the loose fitting portions 34j of the upper float gear 34a and the lower float gear 34b are aligned in the front-rear direction. The small judgment plane connecting part 3d is loosely fitted with a predetermined play angle. At this time, the lower end portion of the ring portion 34e of the other float gear 34 is fitted into the notch 34k.

[0062] The lock ring 33 has a ring shape having an outer shape slightly larger than the tooth tip circle of the output gear 31, and includes an inner surface gear 33a that meshes with the float gear 34 on the inner peripheral surface.

Further, the lock ring 33 is provided with a fixed projection 33b having a circular shape in a front view that is projected by pressing toward the chuck side with a predetermined diameter at a three-direction position that divides the lock ring 33 substantially equally into three in the circumferential direction. Lock ring 33 to prevent interference with the motor output shaft Ml (Fig. 2) The lower part (about 4 o'clock in front view) is provided with a circular arc-shaped notch 33c that protrudes radially inward.

The fixed convex portion 33b is a convex portion for engaging and fixing the lock ring 33 to the gear case 12 (FIG. 2).

[0063] The chuck-side output ring 32b has a circular shape when viewed from the front and has substantially the same outer diameter and appropriate thickness as the motor-side output ring 32a. An axial through hole 32d having the same shape as the cross section of 3d is provided at the center. Further, an appropriate width of the outer peripheral portion of the shaft through hole 32d is protruded toward the chuck side so as to be thicker than other portions, and a central pin through hole 32e is provided in the same manner as the motor side output ring 32a.

[0064] Further, the lateral pin through-holes 32g are symmetrically provided on both the left and right sides of the central pin through-hole 32e with the same interval as the interval between the engagement pin 34f and the engagement protrusion 34g of the spindle 34. I have. The lateral pin through hole 32g is the center side in the width direction of the spindle 32b of the left and right radially inner circular arc portions on the bottom side with respect to the radially outer central arc portion of the three circles constituting the central pin through hole 32e. One of these is a deformed shape with a circular arc in three directions, arranged in a slant so that one of them is on the inside of the diameter and the other is on the outside of the diameter. The side output ring 32b is provided symmetrically so as to be on the vertical center line side in the width direction.

[0065] Further, two fitting holes 32f to be fitted with the fitting clips 32c are provided at positions opposed to each other across the center at a position orthogonal to the two central pin through holes 32e.

The pin insertion hole 31c and the central pin through hole 32e are respectively arranged so as to be at the same position from the center.

[0066] The control ring 43 is formed in a circular shape in front view that is slightly smaller than the outer shape of the output ring 32, and a guide groove 43a in which the engagement pin 34f can be locked with play at the upper end and the lower end. The center of the front view includes a through hole 43b that allows the small judgment surface connecting portion 3d to pass therethrough, and a chuck ring side surface of the control ring 43 includes a ring-shaped fixed ring portion 43c that protrudes toward the chuck side. . As shown in FIGS. 9 and 10, the outer periphery of the fixing ring portion 43c is in close contact with the inner peripheral surface of the outer ring 42a of the bearing 42 described later, thereby fixing the control ring 43 to the outer ring 42a. [0067] The bearing 42 is a so-called radial bearing constituted by an outer ring 42a, an inner ring 42c, and a plurality of steel balls 42b arranged in the circumferential direction at a predetermined interval between the outer ring 42a and the inner ring 42c. The outer ring 42a is formed in a ring shape having a slightly smaller outer diameter than the control ring 43 and an inner diameter substantially the same as the outer diameter of the fixing ring portion 43c.

The bearing 42 may be composed of a force thrust bearing composed of a radial bearing as described above.

[0068] The inner ring 42c is spaced apart from the inner peripheral side surface of the water ring 42a and has an outer shape that is slightly larger than the small judgment surface coupling portion 3d, and has a cross-sectional shape of the small judgment surface coupling portion 3d at the center in front view. And formed in a circular shape when viewed from the front with a through hole 42d that allows passage of the small judgment surface connecting portion 3d.

[0069] In addition, an arc-shaped rolling groove 42e (see Fig. 10) with a steel ball 42b fitted around the inner peripheral side surface of the water ring 42a and the central portion in the front-rear direction of the outer peripheral side surface of the inner ring 42c. There are also two.

In the present embodiment, the force provided with 11 steel balls 42b at equal intervals in the circumferential direction is not limited to this, and may be provided with more or less than 11.

[0070] The fixed gauge 41 has an outer diameter substantially the same as the outer diameter of the watering 42a.

It is formed in a ring shape in front view having a passage hole 41c having a diameter substantially the same as that of the through hole 43b and allowing passage of the small judgment surface connecting portion 3d.

[0071] On the side surface of the chuck of the fixed gauge 41, there is provided a fastening convex portion 41d that is inserted into a fastening hole 36f of the fixed plate 36, which will be described later, at a position equally divided into three in the circumferential direction.

The motor side of the fixed gauge 41 is provided with a ring gauge part 41a inserted between the inner ring 42a of the bearing 42 and the outer ring 42c of the inner ring 42c. Eleven loose recesses 41b in which the balls 42b are loosely fitted are formed at equal intervals.

[0072] The fixing plate 36 has substantially the same outer diameter as the lock ring 33, and includes a ring edge portion 36a attached to the chuck side surface of the lock ring 33, and a hollow convex portion 36d protruding to the chuck side. It is a substantially convex shape in side view. The ring edge 36a is provided with mounting through holes 36b through which the fixed protrusions 33b pass, at positions corresponding to the respective fixed protrusions 33b, and also with interference with the output shaft Ml (FIG. 2) of the motor M. A convex arc-shaped notch 36c is provided on the radially inner side to be prevented.

[0073] The convex portion 36d protruded toward the chuck side by the press carriage has three steps toward the chuck side so as not to interfere with the rotation of the engagement pin 34f, the control ring 43, and the bearing 42. The circular cross section is formed small. In the center of the convex portion 36d on the chuck side end face, there is a passage hole 36e that does not hinder the rotation of the small judgment surface coupling portion 3d and allows the small judgment surface coupling portion 3d to pass therethrough, and the passage hole 36e. Three insertion holes 36f are provided at positions corresponding to the attachment protrusions 41d on the outer peripheral side.

[0074] With the above configuration, as shown in FIG. 4, the two float gears 34 are vertically symmetrical, and the respective engaging portions 34d are engaged with the inner gear 33a of the lock ring 33, so that the left and right spring mounting portions are engaged. The coil spring 35 shortened to 34h is loosely fitted and fitted to the lock ring 33. In this state, the engagement pin 34f on the motor side of the float gear 34 is passed through the central pin through hole 32e of the motor side output ring 32a, and the chuck side of the float gear 34 is inserted into the central pin through hole 32e of the chuck side output ring 32b. The engaging pin 34f and the engaging projection 34g are passed through the side pin through hole 32g, and the lock ring 33 and the float gear 34 are sandwiched between the motor side output ring 32a and the chuck side output ring 32b. In the embodiment, the fitting hook 32c penetrating the rectangular through hole 37d and the fitting hole 32f are fitted and assembled.

[0075] The control ring 43, the bearing 42, and the fixed gauge 41 are arranged on the chuck side of the assembled motor side output ring 32a, chuck side output ring 32b, lock ring 33 and float gear 34 in this way. The fixing protrusion 41d of the fixing gauge 41 is attached to the attaching hole 36f of the fixing plate 36, the fixing protrusion 33 3b of the lock ring 33 is attached to the mounting through hole 36b of the fixing plate 36, and the fixing plate 36 36 and fixed gauge 41 are used to assemble bearing 42 and control ring 43 so as to cover the chuck side force.

At this time, as shown in FIG. 10, the chuck-side engagement pin 34f of the float gear 34 that protrudes from the chuck side surface of the chuck-side output ring 32b passes through the central pin through-hole 32e and the control ring ring 43. Assemble the guide groove 43a.

In this state, as shown in FIG. 4, these motor side output rings 32a are threaded and attached. The output gear 31 is arranged on the same axis on the motor side, and the small judgment surface connecting part 3d of the spindle 3 is fitted into the through hole 42d of the inner ring 42c and the shaft through hole 32d of the output ring 32, and the output gear 31 Assemble the spindle 3 from the passage hole 36e side and assemble the lock mechanism 10A so that it is loosely fitted to 3 lb of the shaft through hole.

[0078] At this time, as shown in FIG. 9 and FIG. 10 and the enlarged view of FIG. 10a, the fixed gauge 41, bearing 42 and control ring 43 are configured as described above, so that the spindle 3 and the inner ring 42c Are fixedly fitted and rotated together. Further, since the outer surface of the fixing ring portion 43c and the inner surface of the water ring 42a are in close contact with each other, the control ring 43 rotates together with the water ring 42a. Further, since the steel ball 42b is loosely fitted in the loose fitting recess 41b of the fixed gauge 41 fixed to the lock ring 33 via the fixing plate 36, the circumferential position of the steel ball 42b can be maintained.

Accordingly, the inner ring 42c rotates with the rotation of the spindle 3, and the rotation of the inner ring 42c is inverted and transmitted to the outer ring 42a via the steel ball 42b. Specifically, since the circumferential position of the steel ball 42b is maintained, the steel ball 42b rotates on the spot while maintaining the circumferential position. Therefore, the rotation is transmitted to the counter ring 42a as a rotation in a rotation direction opposite to the rotation direction of the spindle 3 that rotates integrally with the inner ring 42c. At this time, the rotational speed of the water ring 42a is reduced based on the ratio of the diameters of the water ring 42a and the inner ring 42c. The mechanism shown in FIG. 9, which is composed of the fixed gauge 41, the bearing 42, and the control ring 43 and transmits the rotation of the spindle 3 to the engagement pin 34f by reversing the rotation, is referred to as the reversing mechanism 40 in this specification. .

[0080] Next, the operation of the lock mechanism section 10A will be described with reference to FIGS.

11, 14, 15, and 18 are front views from the chuck side of the output gear 31 in each state, and FIGS. 12, 17, and 19 are assembled to the lock mechanism 10A in each state. Further, a front view from the chuck side of the control ring 43 portion is shown, and FIGS. 13 and 16 are front views from the chuck side of the bearing 42 portion assembled to the lock mechanism portion 10A in each state. 11, 14, 15, and 18, the chuck side output ring 32 b is shown in order to show the positional relationship between the pin insertion hole 31 c and the central pin through hole 32 e of the outlet ring 32. Is indicated by a dotted line.

First, the locked state will be described. In the locked state, as shown in FIG. 11, the engagement pin 34f on the motor side of the float gear 34 is fitted to the radially outer central arc portion of the pin insertion hole 31c, and as shown in FIG. The engaging pin 34f on the chuck side is fitted to the outer central circular arc portion of the central pin through hole 32e of the output ring 32. In this state, as shown in FIG. 8 (c), the float gears 34 arranged in the vertical direction are in the above-mentioned outside rotation fixed position.

Therefore, the output gear 31 and the output ring 32 rotate to the lock ring 33 via the engagement pin 34f of the float gear 34 that is rotated and fixed to the lock ring 33 fixed to the gear case 12 (see FIG. 2). Since the shaft through hole 32d of the output ring 32 and the small judgment surface connecting part 3d of the spindle 3 are fitted with no play angle, the spindle 3 is fixed and rotated so that the user can replace the bit for exchanging bits. Even if the spindle is rotated, the spindle 3 does not rotate, and the user can safely replace the bit.

Next, a release operation for releasing the lock state of the lock mechanism portion 10A by driving the motor M (FIG. 1) will be described.

When the user operates the switch handle 6 (Fig. 1) and inputs a drive signal, the motor M rotates and the rotational driving force of the motor M is the tooth 3 la that meshes with the input gear M2 (Fig. 2). Is transmitted to the output gear 31 via. In the following description, the rotation of the motor M is defined as a rotational driving force that rotates the output gear 31 counterclockwise (counterclockwise) when viewed from the chuck side force.

Here, FIG. 14 shows a front view from the chuck side of the output gear 31 in a state in which the output gear 31 has been rotated counterclockwise << °, as indicated by an arrow in FIG. 11 from the locked state described above.

When the output gear 31 has rotated left by a degree, the engaging pin 34f that was in the outer central arc of the pin insertion hole 31c is left by the side surface (right side surface) of the pin insertion hole 31c in the rotational direction. It is pressed in the direction of rotation.

[0085] The float gear 34, in which the engagement portion 34d of the float gear 34 is engaged with the inner gear 33a of the lock ring 33, cannot rotate counterclockwise and rotates counterclockwise against the urging force of the internal coil spring 35. The pin insertion hole 31c to be moved moves radially inward along the side surface on the rear side in the rotation direction. In this state, as shown in FIG. 8 (d), the engagement between the engaging portion 34d and the inner gear 33a is eliminated, and the output ring 32 and the pin engaging the engaging pin 34f with the central pin through hole 32e. Insertion hole The rotation of the output gear 31 engaged with 31c with respect to each lock ring 33 is released.

[0086] In this state, the rotation fixing of the output ring 32 is released, and the play angle between the small judgment surface connecting portion 3d of the spindle 3 and the shaft through hole 31b of the output gear 31 is digested, and the left of the output gear 31 continues. By rotation, the rear side surface in the rotational direction of the small judgment surface coupling part 3d is pressed in the rotational direction by the upper part of the side surface of the shaft through hole 31b facing the spindle 3 and the output ring 32 fitted on the spindle 3 It can be rotated.

However, in this state, since the loose fitting portion 34c is provided in the float gear 34, the float gear 34 moved to the in-diameter fixed release position and the small judgment surface connecting portion 3d do not come into contact with each other. In this state, the side surface of the radially inner circular arc portion of the central pin through-hole 32e is also in contact with the engaging pin 34f, and therefore the rotation of the float gear 34 is not transmitted at this in-diameter rotation fixed position.

[0088] Subsequently, as shown by the arrow in FIG. 14, the output gear 31 is further rotated by | 8 ° counterclockwise (from the hooked state to (a + j8) ° counterclockwise). Fig. 15 shows a front view of the chuck side force of the output gear 31, Fig. 16 shows a front view of the chuck side force of the 42 part bearing attached to the lock mechanism 10A, and Fig. 16 shows a front view of the lock mechanism 10A. The control ring 43 part will be described with FIG. 17 showing a front view from the chuck side.

[0089] As described above, the shaft through hole 31b of the output gear 31 that receives the rotational driving force of the motor M presses the rear side surface in the rotation direction of the oval cross-section coupling portion 3d in the left rotation direction, and the omission judgment surface coupling portion 3d. And the attached output ring 32 rotates counterclockwise. However, as described above, since the rotational force is not transmitted to the engaging pin 34f, the engaging pin 34f is fitted to the radially inner circular arc portion on the rear side (right side) in the rotational direction of the pin insertion hole 31c and the central pin through hole 32e. . In this state, the float gear 34 is pressed in the rotational direction by the side surface of the radially inward arc portion on the rear side in the rotational direction of the pin insertion hole 31c and the central pin through hole 32e, so that the spindle 3, the output ring 32, The output gear 31 and the float gear 34 rotate integrally, and rotate in this state while the motor M is rotating.

[0090] In addition, the control ring 43 is reversed with respect to the spindle 3 by the reversing mechanism 40, so that The engaging pin 34f is pressed in the reverse direction (right rotation) on the rear side (left side) in the reverse direction of the guide groove 43a. In other words, the engagement pin 34f is sandwiched between the reverse side rear side surface (left side) of the guide groove 43a and the radially inner circular arc side surface of the central pin through hole 32e rearward (right side). At this time, since the spindle 3, the output ring 32, the output gear 31, and the float gear 34 rotate integrally, the control ring 43 rotates the spindle 3 via the engaging pin 34f. The rotational force of the spindle 3 is transmitted to the outer ring 42a through the fixed ring portion 43c. Accordingly, the steel ball 42b is slid between the water ring 42a and the inner ring 42c, and the spindle 3, the output ring 32, the output gear 31 and the float gear 34 rotate integrally with the control ring 43.

[0091] In the above description, the case where the output gear 31 rotates << ° and the state where it further rotates j8 ° are described separately. However, the actual operation is a series of operations, and the lock mechanism 1 OA is When in the locked state, the user can auto-release and rotate the lock mechanism section 10A that has been in the locked state simply by operating the switch handle 6 (Fig. 1), improving user convenience. be able to.

While the motor M is rotating, the control ring 43 slides with the steel ball 42b and rotates integrally with the spindle 3. However, due to the reversing effect of the reversing mechanism 40, the engaging pin 34f has the guiding groove 43a. Rotating integrally with the spindle 3 while being pressed in the reverse direction.

[0093] Therefore, the pin insertion hole 31c and the central pin through hole 32e can be rotated while the engagement inner pins 34f are securely engaged with the radially inner circular arc portion on the rear side in the rotation direction. The engagement pin 34f is disengaged from the radially inner arc portion at the rear of the direction, preventing the lock mechanism 10A from being inadvertently locked.

[0094] Further, due to the reversal effect of the reversing mechanism 40 described above, after the motor M is stopped, the spindle 3 rotates in the previous rotation direction by the free angle α with the shaft through hole 31b by the inertial force of the spindle 3 ( In the following, inertial force rotation) is prevented. Also, for example, when a tool with a large inertial force such as a rotor is attached to the chuck, the inertial force of the spindle 3 after the motor Μ stops exceeds the reversing force by the reversing mechanism 40, and inertial force rotation occurs. Even in this case, since the inertial force of the inertial force rotation is reduced by the reversing mechanism 40, the lock mechanism In particular, it is possible to reduce the impact and load generated on the loose fitting portion between the small judgment surface connecting portion 3d and the shaft through hole 3 lb with respect to the portion 10A.

Next, the locking operation after the rotation of the motor M is stopped will be described.

As described above, when the inertial force does not rotate after the motor is stopped, the float gear 34 is in the radially fixed release position on the radially inward side and stopped in the state shown in FIGS. 15, 16, and 17. However, in this state, since the mating portion 34d and the inner gear 33a are not mated, the spindle 3 is in a rotatable state.

[0096] In order to perform bit exchange or the like, the user is assumed to rotate the spindle 3 in either the right rotation or the left rotation in this state.

First, a case will be described in which the user rotates the spindle 3 counterclockwise by the motor M in the same direction as before.

[0097] When the spindle 3 rotates counterclockwise, the output ring 32, which is rotationally fixed to the spindle 3, rotates counterclockwise integrally with the spindle 3, and in the float gear 34, the engagement pin 34f rotates the central pin through hole 32e. Since it is pressed by the rear side (right side) in the direction, it rotates integrally with the spindle 3. However, since there is a play angle in front of the rotation between the shaft through hole 31b and the small judgment surface connecting portion 3d, the output gear 31 and the spindle 3 do not rotate integrally.

Accordingly, the engagement pin 34 f pressed against the side surface of the central pin through-hole 32e in the rotational direction is urged by the outward biasing force of the coil spring 35 in the rotational direction of the pin insertion hole 31c. The float gear 34 moves to the outside rotation fixed position. Therefore, as described above, the engaging portion 34d and the inner gear 33a are engaged (see FIG. 8C), and the lock mechanism portion 10A is in the fixed state shown in FIGS. 11, 12, and 13.

[0099] Next, a case where the user rotates the spindle 3 to the right, which is the direction opposite to the direction in which the motor M has been rotated, will be described.

When the spindle 3 is rotated to the right as shown by the arrow A in FIG. 16, the output ring 32 fixed to the spindle 3 is rotated to the right integrally with the spindle 3, and the float gear 34 has the engagement pin 34f. Since the center pin through hole 32e is pressed by the rear side surface (left side surface) in the rotation direction, it rotates integrally with the spindle 3. Here, unlike the case of left rotation, In this case, since there is no play angle α in the forward direction of rotation between the shaft through hole 31b of the output gear 31 and the small judgment surface connecting portion 3d of the spindle 3, as shown in FIG. 18, the spindle 3 and the output gear 31 And rotate together. However, by rotating the spindle 3 to the right, the inner ring 42c fitted and fixed to the small judgment surface coupling part 3d through the through hole 42d rotates to the right, and the inner ring 42c rotates clockwise through the steel ball 42b. Rotate 42a counterclockwise as shown by arrow B in Fig. 16. As a result of the reversal effect of the reversing mechanism 40, the counter ring 42a and the control ring 43, which is rotationally fixed, rotate counterclockwise as indicated by an arrow C in FIG.

Accordingly, as shown in FIG. 19, the reverse side (right side) side surface of the guide groove 43a presses the engagement pin 34f in the direction of arrow D in FIG. The engaging pin 34f, which is locked to the radially inner arc portion on the rear side (right side) of the through-hole 32e driven by the motor, is driven by the biasing force of the coil spring 35 in the radially outward direction. 31c and the central pin through-hole 32e are moved radially outward along the rear side (right side) of the motor driven by the motor, and the float gear 34 is located at the above-mentioned outer rotation fixed position shown in FIG. 8 (c). Move to. Therefore, as described above, the engaging portion 34d and the inner gear 33a are engaged, and the lock mechanism portion 10A is in the fixed state shown in FIGS. 11, 12, and 13.

[0101] With this, rotation of the output gear 31 side force that inputs rotational driving force automatically guides the float gear 34 to the radially inner side to release the engagement with the lock ring 33 and release it. It can be Further, the rotation of the spindle 3 by the reversing mechanism 40 is reversed and transmitted to the control ring 43 by the rotation mechanism 40 by the user or the like, and the reversed control ring 43 is located at the radially inner position. The float gear 34 thus guided can be moved to the radially outward position by the urging force of the coil spring 35 to lock the lock mechanism 10A.

[0102] Therefore, after the motor M stops, the user rotates the spindle 3 in the same direction or in the opposite direction when the spindle 3 stops in a rotatable state. Thus, the spindle 3 can be automatically locked. Therefore, as described above, when the user rotates the spindle 3 for bit exchange etc. Even if it is, the rotation of the spindle 3 is fixed, and the user can safely replace the bit.

[0103] In addition, the control ring 43 that is transmitted by reversing the rotation of the spindle 3 by the reversing mechanism 40 is rotated together with the spindle 3 by sliding the steel ball 42b during rotation by the motor drive. Therefore, the engagement pin 34f can be reliably held at the radially inward release position. Therefore, it is prevented that the float gear 34 is inadvertently moved to the lock position on the radially outer side during the rotation by the motor drive and the lock is applied.

[0104] Further, since the release mechanism for guiding the engaging convex portion 34g to the in-diameter fixed release position is formed by the pin insertion hole 31c, the rotation output device is compact compared to the case where another member is provided. 10 can be configured.

[0105] In addition, the float gear 34 is formed with the loosely fitting portion 34c to which rotation is not transmitted from the spindle 3, so that the float gear 34 reliably ensures that the rotation angle of the loosely fitting portion 34c is equal to the spindle 3. Co-rotation can be surely prevented. Even when the output gear 31 and the spindle 3 rotate together in the absence of the play angle α, the movable lock body can reliably function without rotating together.

In addition, since the two float gears 34 are fixedly engaged with the lock ring 33, the rigidity at the engaging portion is increased, the lock torque at the time of locking can be increased, and a reliable and stable lock function can be obtained. Can do.

[0106] Further, the float gear 34 includes a ring portion 34e that surrounds the small judgment surface coupling portion 3d and includes a fitting fixing groove 34i on the lower side of the inner circumference, and includes an upper float gear 34a and a lower float gear 34b. Are arranged in a vertically symmetrical position so that the ring portions 34e overlap in the front-rear direction, so that each fitting fixing groove 34i of the float gear 34 at the lock position on the radially outer side is judged small. The notch 3f of the surface connecting part 3d can be fitted in such a manner as to be sandwiched from two directions. Therefore, the spindle 3 can be reliably rotated and fixed by the float gear 34 which is engaged with the lock ring 33 and fixedly rotated.

[0107] Further, by increasing the thickness of the output ring 32 at the fitting portion with the spindle 3, the pressure receiving area with the spindle 3 can be increased, and the rotational torque from the spindle 3 can be increased. On the other hand, while the output ring 32 itself is thinned, the output ring 32 is securely rotated. You can receive Therefore, while the output ring 32 is made compact, the rotational torque from the spindle 3 can be reliably received, and the lock torque can be increased.

[0108] In addition, since the reversing mechanism 40 includes the fixed gauge 41, the bearing 42, and the control ring 43, the assembly of the lock mechanism portion 10A is facilitated. Further, for example, even if the reversing mechanism 40 is worn, the reversing mechanism 40 can be replaced, so that the satisfaction of the user can be improved.

Note that the fixing plate 36 in the present embodiment may be formed integrally with the lock ring 33. Specifically, when the lock ring 33 is formed, a portion corresponding to the convex portion 36d of the present embodiment may be formed by a press cage in the disk-shaped steel material force. In this way, it is possible to reduce the number of parts constituting the lock mechanism portion 10A and to reduce a part of the assembly process.

Next, another embodiment shown in FIGS. 20 to 22 will be described. In this embodiment, in the reversing mechanism 40, the back-up ring 44 is disposed between the control ring 43 and the bearing 42 to increase the rolling resistance of the steel ball 42b of the bearing 42. Is to act reliably.

[0111] Specifically, the knock-up ring 44 is a circular ring shape having a square cross section and substantially the same front view outer diameter as the inner ring 42'c, and as shown in FIG. Fit inside the diameter and assemble to reverse mechanism 40. Note that the knock-up ring 44 is formed of a hard rubber having an appropriate strength. Further, the knock-up ring 44 includes a radial cut portion 44a that penetrates the outer peripheral side and the inner peripheral side in a part of the circumferential direction in order to facilitate the fitting of the fixing ring portion 43c to the inner diameter side. RU

The rolling groove 42e of the inner ring 42'c has a substantially J-shaped groove shape extending linearly in the axial direction from the apex of the circular groove in the cross section to the chuck side.

[0112] As described above, the backup ring 44 is arranged between the control ring 43 fixed to the outer ring 42a via the fixing ring portion 43c and the inner ring 42'c. The inner ring 42, c can be pressed to the spindle 3 side using the control ring 43 as a reaction force.

[0113] Therefore, the inner ring 42'c is attached to the chuck in the front-rear direction with respect to the watering 42a. As shown in Fig. 22b, the steel ball 42b is positioned in front of the rolling groove 42e of the watering 42a (right side in the figure) and behind the rolling groove 42e of the inner ring 42'c (in the figure). Contact pressure increases with the left side). Therefore, the steel ball 42b can be reliably transmitted by the watering 42a by reversing the rotation of the inner ring 42 'from the spindle 3.

[0114] Further, even when the bearing 42 of the reversing mechanism 40 is worn or the like due to use, the knock-up ring 44 presses the inner ring 42'c toward the chuck side, so that the spindle 3 is reliably rotated. It can be inverted and transmitted to the control ring 43.

[0115] Further, in this embodiment, the backup ring 44 is formed of hard rubber, but is not limited to this, and in accordance with the contact pressure of the steel ball 42b with respect to the rolling groove 42e, fluorine resin, nylon (Polyamide resin), leather, light metal, etc. may be used. Accordingly, for example, the material of the backup ring 44 having a desired strength can be selected and adopted in accordance with the material strength of the bearing 42.

[0116] The rotation output device of the present invention corresponds to the rotation output device 10,

Similarly,

The rotary input body corresponds to the output gear 31.

The play angle corresponds to the play angle α,

The rotation output means corresponds to spindle 3 and watering 42a,

The fixing member corresponds to the lock ring 33,

The movement lock plate corresponds to the float gear 34,

The biasing body corresponds to the coil spring 35,

The guiding means corresponds to the control ring 43 and the inner rings 42c, 42, c, the reversing mechanism corresponds to the reversing mechanism 40,

The rolling element holder corresponds to the fixed gauge 41,

The release mechanism corresponds to the pin insertion hole 31c,

The rolling element loose fitting groove corresponds to the loose fitting recess 41b,

The mounting part corresponds to the fixed plate 36,

The rolling element corresponds to the steel ball 42b, The rotating output body corresponds to spindle 3,

Output body side contact part corresponds to watering 42a,

The guiding part corresponds to the control ring 43,

Guide part side contact part corresponds to inner ring 42c, 42'c,

The assembly corresponds to the bearing 42,

The preload means corresponds to the knock-up ring 44,

The engaging projection corresponds to the engaging pin 34f,

The release groove corresponds to the pin insertion hole 31c,

The guide groove corresponds to the guide groove 43a,

The loose fitting portion corresponds to the loose fitting portion 34j,

The fitting groove corresponds to the fitting fixing groove 34i,

The guide holding plate corresponds to the output ring 32,

The fitting part corresponds to the notch 3f,

The go part corresponds to the ring part 34e,

The present invention is not limited to the configuration of the above-described embodiment.

Claims

The scope of the claims

[1] A rotational input body for inputting rotational driving force;

A rotation output means arranged on the same axis as the rotation input body, and having a play angle of a predetermined angle, receiving a driving force from the rotation input body and outputting a rotation force;

A fixing member disposed on the outer periphery of the rotation output means and fixed in rotation;

A movable lock plate that moves radially outward and engages and fixes to the fixing member; and a biasing body that biases the movable lock plate radially outward;

Guiding means for guiding the movement of the movable lock plate to the radially outward side;

A reversing mechanism for reversing the rotation of the rotation output means and transmitting it to the guiding means.

A rolling element that contacts both the guiding means and the rotation output means; and a rolling element holding portion that holds a circumferential position of the rolling element,

Provided in the rotary input body is a release mechanism that releases the engagement and fixation with the fixing member by guiding the movable lock plate radially inward by rotation from the rotary input body side,

A rotation output device comprising a lock mechanism that guides a movable lock plate located radially inward to the radially outward side by rotation from the rotation output means, comprising the reversing mechanism, the guiding means, and the biasing body.

[2] A plurality of the rolling elements are provided in the circumferential direction.

The rotation output device according to claim 1.

[3] The rolling element is formed of a sphere.

The rotation output device according to claim 1 or 2.

[4] In the rolling element holding part,

Loosely fitting the rolling elements, and rolling element loose fitting grooves arranged at equal intervals in the circumferential direction;

Provided with an attachment part to be attached to the fixing member

The rotation output device according to claim 2 or 3.

[5] The rotation output means includes a rotation output body and an output body side contact portion that rotates integrally with the rotation output body, The guide means includes a guide portion and a guide portion side contact portion that rotates integrally with the guide portion, and the rolling element, the output body side contact portion, and the guide portion side contact portion are configured as an assembly.

The rotation output device according to any one of claims 1 to 4.

[6] In the reversing mechanism,

Preloading means for increasing the contact pressure of the rolling element with the guide portion side contact portion and the output body side contact portion is provided.

The rotation output device according to claim 5.

[7] The preload means is made of an elastic material.

The rotation output device according to claim 6.

[8] The moving lock plate includes an engaging convex portion,

A guide groove for engaging the engaging projection with the guide portion;

The release mechanism is configured with a release groove with which the engagement convex portion engages.

The rotation output device according to claim 5, 6 or 7.

[9] Between the movement lock plate and the rotation output body,

A loosely fitting portion that enables relative rotation between the movable lock plate and the rotation output body at a radially inward position;

Formed is a fitting groove into which the movable lock plate located at the radially outward position and the rotary output body are fitted.

The rotation output device according to any one of claims 5 to 8.

[10] A guide holding plate fixed to the rotation output body and rotating integrally with the rotation output body,

A plurality of the movement lock plates provided in the circumferential direction are held on the guide holding plate so as to rotate integrally.

The rotation output apparatus in any one of Claims 5-9.

[11] The rotation output body includes a fitting portion that fits into the fitting groove,

The moving lock plate includes an encircling portion that encloses the fitting portion,

The fitting groove is formed on the side of the surrounding portion opposite to the moving direction on the radially outer side of the moving lock plate. Prepare for the inner circumference,

Two movement lock plates are arranged at positions and orientations symmetrical with respect to the axis of the rotary output body in the movement direction.

The rotation output device according to any one of claims 5 to 10.

An electric tool having the rotation output device according to any one of claims 1 to 11 interposed in an output system.