KR20130111853A - Friction gear assembly and door locking apparatus for washing machine with use in the same - Google Patents

Abstract

PURPOSE: A friction gear assembly and door locking apparatus for a washing machine are provided to protect a gear by preventing the gear from being influenced by static friction force at the same time. CONSTITUTION: A friction gear assembly comprises a first gear (330a), a second gear (330b), a spring (330c), and a linkage unit. The first gear receives rotary power. The second gear comprises a rotary shaft same as the rotary shaft of the first gear. The spring is installed in the first gear, and comprises a split ring (331c) and two fixing strips (333c, 333c'). The linkage unit is formed in the second gear, and linked to the spring. The linkage unit is placed between the fixing strips.

Description

Friction gear assembly and door locking apparatus for washing machine with use in the same}

The present invention relates to a door lock device for a washing machine mounted on a washing machine main body to lock a closed state of a lid, and more particularly, a friction gear assembly for providing a frictional friction with a friction spring ring having a split ring and a bending piece, and a washing machine using the same. Relates to a door lock.

A conventional door lock for a washing machine is shown in FIGS. 14 to 17.

As shown in Fig. 14 and 16, the conventional door lock device for a washing machine has a housing 10 forming an external shape, a drive unit 30 mounted in the housing 10, the opening 11 of the housing 10. The lock pin 50 is moved forward and backward by the driving of the drive unit 30 is disposed in the. Reference numeral 11 denotes a semicircular opening and a semicircular opening corresponding to the cover 10B is formed to guide the lock pin 50 in a slidable manner. O-ring 12 is installed in the opening to function as a seal to prevent foreign matter from penetrating from the outside.

The housing 10 consists of a case 10A and the cover 10B which covers the upper surface of the case 10A, as shown to FIG. 14 and FIG.

The rubber packing 13 is provided in the edge lower surface 10b of the cover 10B.

Therefore, when the cover 10B is coupled to the case 10A, the rubber packing 13 is pressed against the edge top surface 10a of the case 10A to seal the inside of the housing 10.

Moreover, the outer side wall 11 which surrounds the outer side of the edge of case 10A is formed in the edge of cover 10B.

As such, a separate rubber packing 13 is used to seal the inside of the housing 10, which increases the assembly process and increases the cost.

In addition, as shown in FIG. 14, the housing 10 includes a PCB 20 electrically connected to the driving unit 30 and the lead wires 21 and 23.

That is, the PCB 20 and the driving unit 30 take a structure arranged on the left and right when viewed in a planar manner, and are wider by the width of the PCB 20, thereby increasing the volume.

In addition, the terminals 20 of the terminal unit (not shown) that receive external power are connected to the PCB 20. The terminals 41 are fixed to a terminal box (not shown) formed integrally with the bottom surface of the case 10A.

In this way, since the terminal 20 is installed in the case 10A, the PCB 20 and the motor 10 are mounted in the case 10A, so that at least two assembling steps are performed.

In addition, as shown in FIG. 15, the driving unit 30 includes a motor 31, a worm 33 coupled to a rotation shaft of the motor 31, a friction gear assembly 35, a worm 33, and a friction gear. Intermediate gear assembly 37 interposed between the assembly 35, the rack mechanism 39 for converting the rotational power of the friction gear assembly 35 into the linear motion to the lock pin 50.

Therefore, the arrangement of the intermediate gear assembly 37 occupies such a wider space.

The rack mechanism 39 is composed of a rack 39b formed on one side of the slider 39a on which the lock pin 50 is formed and a pinion 35b of the friction gear assembly 35.

The worm 33 is engaged with the worm wheel 37a of the intermediate gear assembly 37 as a drive gear, and the gear 37b of the intermediate gear assembly 37 is engaged with the gear 35a of the friction gear assembly 35. All.

The worm wheel 37a and the gear 37b are attached to the shaft S1.

As illustrated in FIG. 17, the friction gear assembly 35 has receiving grooves 40a and 40b formed on the upper and lower surfaces of the gear 35a to accommodate washer-type leaf springs 41a and 41b.

Contact protrusions 43a and 43b which are placed at the bottom of the receiving grooves 40a and 40b and are in contact with the washer-type leaf springs 41a and 41b are formed.

The flange 47 formed in the lower end of the pinion 35b side is arrange | positioned on the contact protrusion 43a, and the lower shaft 45a is arrange | positioned under the contact protrusion 43b.

When the screw 49 is fastened to the pinion 35a side through the shaft 45a, the contact protrusions 43a and 43b act as static friction forces to press the flange 47 and the shaft 45a at the lower end up and down. .

Therefore, normally, the rotational force of the gear 35a is transmitted to the pinion 35b through the static frictional force to rotate together.

However, at the time of abnormality, for example, when the lock pin 50 cannot advance due to a clogged foreign object, a torque larger than the static frictional force is caught by the gear 35a, so that the rotational force cannot be transmitted to the pinion 35b, and only the gear 35a is idle. To prevent overload of the motor 31.

In particular, the washer-type leaf springs 41a and 41b have a large static frictional force, and the static frictional force at the time of slippage acts on the gear at a time, which adversely affects the gear.

Reference numeral 45b (S2) is a shaft at the top of the pinion 35b.

Therefore, the rotation shaft of the friction gear assembly 30 is rotatably supported by shaft support grooves (not shown) formed in the upper and lower shafts S2 in the case 10A and the cover 10B.

The present invention has been made in view of the above-described problem, and an object of the present invention is to provide a friction gear assembly that protects the gears by preventing the static friction force from acting on the gears at once and a door lock device for a washing machine using the same.

In order to achieve the above object, the friction gear assembly according to claim 1 of the present invention,

A first gear that receives rotational power; A second gear having the same rotation axis as that of the first gear; A spring installed on the first gear; And a engaging protrusion formed in the second gear and engaging with the spring, wherein the spring comprises a split ring in which the first ring is expanded and closely contacted with the first gear, and two bent pieces having both ends of the split ring bent toward the inner ring. The engaging projection is disposed between the bent piece and the bent piece.

Friction gear assembly according to claim 2 of the present invention,

A first extension tube protrudes from an upper surface of the first gear, and an inner wall of the first extension tube is formed with an accommodation groove in which the split ring is accommodated, and an inner circumferential surface of the lower surface of the second gear on an outer circumferential surface of the first extension portion. The second extension tube to be fitted is formed to protrude.

Friction gear assembly according to claim 3 of the present invention,

The lower surface of the second gear is further formed with an inner protruding frame connected to both sides of the engaging projection while the outer peripheral surface is fitted to the inner peripheral surface of the first extension portion.

Friction gear assembly according to claim 4 of the present invention,

A reinforcing rotary shaft protrudes from an upper surface of the first gear, and a reinforcing support groove for inserting and supporting the reinforcing rotary shaft is formed on a lower surface of the second gear.

The door lock device for a washing machine according to claim 5 of the present invention,

A housing comprising a case and a cover covering an upper surface of the case; A lock pin installed in the opening formed in the housing; A drive unit mounted to the housing to move the lock pin forward and backward; And a motor providing power to the driving unit, wherein the driving unit includes a worm coupled to a rotation shaft of the motor, a friction gear assembly meshing with the worm, and a rotational force of the friction gear assembly in a linear motion to the lock pin. The friction gear assembly includes: a first gear engaged with the worm; A second gear having a same rotation axis as that of the first gear and meshing with the motion conversion mechanism; A spring installed on the first gear; It is formed in the second gear and the engaging projection is engaged with the spring, the spring is composed of a split ring which is in close contact with the first gear, and two bent pieces of which both ends of the split ring is bent toward the inner ring side The engaging projection is disposed between the bent piece and the bent piece.

According to the configurations of Claims 1 and 5, the gears are protected by preventing the static friction force from acting on the friction gear at once.

The door lock device for a washing machine according to claim 6 of the present invention,

A first extension tube protrudes from an upper surface of the first gear, and an inner wall of the first extension tube is formed with an accommodation groove in which the split ring is accommodated, and an inner circumferential surface of the lower surface of the second gear on an outer circumferential surface of the first extension portion. The second extension tube to be fitted is formed to protrude.

According to the configurations of Claims 2 and 6, a convenient layout is provided for the mounting of the split ring and the operation during overload.

The door lock device for a washing machine according to claim 7 of the present invention,

The lower surface of the second gear is further formed with an inner protruding frame connected to both sides of the engaging projection while the outer peripheral surface is fitted to the inner peripheral surface of the first extension portion.

According to the configuration of claim 3 and 7, it serves to guide the idling of the first gear relative to the second gear during overload, while inducing deformation to only the inner ring during compression of the split ring.

The door lock device for a washing machine according to claim 8 of the present invention,

A reinforcing rotary shaft protrudes from an upper surface of the first gear, and a reinforcing support groove for inserting and supporting the reinforcing rotary shaft is formed on a lower surface of the second gear.

According to the configurations of claims 4 and 8, the idle gear of the first gear with respect to the second gear when the overload is accurately guided to further increase the protection capability of the gear.

The present invention has the following effects.

By adopting a spring formed with a bending piece in the split ring, the gear is protected by stopping the static friction force from acting on the friction gear at a time.

A first extension tube protrudes from an upper surface of the first gear, and an inner groove is formed with a receiving groove for receiving a split ring, and a second extension tube with an inner circumferential surface fitted to an outer circumferential surface of the first extension on the lower surface of the second gear is formed. This accurately guides the idle operation of the first gear to the second gear when the split ring is mounted and overloaded.

The inner surface of the second gear is formed on the inner circumferential surface of the first extension portion, the inner rim is further connected to both sides of the engaging portion is formed, thereby more accurately guiding the idling of the first gear against the second gear when overloaded. It also acts as a guide to deforming the split ring only towards the inner ring.

The reinforcement rotating shaft is protrudingly formed on the upper surface of the first gear, and the reinforcing support groove is formed on the lower surface of the second gear to support the reinforcing rotating shaft. Increased protection

1 is a perspective view showing the appearance of the door lock device for a washing machine according to a preferred embodiment of the present invention.
2A and 2B are plan views with the cover of FIG. 1 removed, before and after locking.
3 is a front view with the housing of FIG. 1 removed;
4 is a perspective view of the driving unit in FIG.
5A and 5B are a perspective view and a plan view of the stop plate;
5C is a plan view of the cam gear in FIG. 5B.
FIG. 5D is a plan view of a manual unlocking lever installed in FIG. 5C; FIG.
6 is an exploded perspective view of the friction gear assembly;
7 is a cross sectional view of FIG. 6.
8 is a plan view showing the operation sequence of the spring, (a) is before the operation, (b) is a state in which power is transmitted, (c) is a state in which slip occurs.
Figure 9 is a perspective view showing the manual release lever and the ram gear separated.
FIG. 10 is a perspective view showing the cam gear of FIG. 9 from the back; FIG.
11 is a perspective view showing the case and the cover separated.
12 and 13 are cross-sectional views before and after coupling the case and the cover.
14 is a plan view with the cover of the conventional door lock device for a washing machine removed.
FIG. 15 is a plan view of the main drive of FIG. 14; FIG.
Figure 16 is a partial cross-sectional view before and after combining the conventional case and the cover.
FIG. 17 is a sectional view taken along line 17-17 of FIG. 15; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing the appearance of the door lock device for a washing machine according to a preferred embodiment of the present invention, Figures 2a and 2b is a plan view of removing the cover of Figure 1, a state diagram before and after the lock, Figure 3 is Figure 1 4 is a perspective view of the driving unit in FIG. 3, FIGS. 5A and 5B are a perspective view and a plan view of the stop plate, and FIG. 5C is a plan view of the cam gear installed in FIG. 5B, FIG. 5D is a plan view of the manual unlocking lever installed in FIG. 5C, FIG. 6 is an exploded perspective view of the friction gear assembly, FIG. 7 is a sectional view of FIG. 6, and FIG. 8 is a plan view illustrating the operation sequence of the spring. (a) is before the operation, (b) is a state in which power is transmitted, (c) is a state in which slip occurs, Figure 9 is a perspective view showing the manual release lever and the ram gear separated, Figure 10 is a Figure 11 is a perspective view showing the cam gear from the back, and Figure 11 A perspective view showing a separating device and the cover, FIG. 12 and FIG. 13 is a cross-sectional view before and after the coupling of the housing and the cover.

1 to 4, the door lock device for a washing machine according to the present embodiment includes a housing 100, a lock pin 500 installed in an opening 101 formed in the housing 100, and a housing 100. And a drive unit 300 mounted to the lock pin 500 to move forward and backward, and a motor 700 providing power to the drive unit 300.

As shown in FIGS. 11 and 12, the housing 100 includes a case 110 and a cover 130 covering an upper surface of the case 110.

As shown in FIG. 11, the opening 101 includes a semicircular opening 101a formed at one side of the case 110 and a semicircular opening 101b formed at one side of the cover 130.

The semicircular openings 101a and 101b are provided with mounting grooves 103a (not shown) in which the O-rings 510 are mounted.

A fastening protrusion 103 is formed on the side of the case 110, and a U-shaped fastening engaging jaw 105 that is caught by the fastening protrusion 103 is formed on the side of the cover 130.

In addition, as shown in FIG. 1, a fastening protrusion 104 is formed on the rear surface of the case 110, and a fastening engaging jaw 106 having a hook shape that is caught by the fastening protrusion 104 is formed on the rear surface of the cover 130.

12 and 13, the fitting groove 135 having the outer wall 131 and the inner wall 133 is formed at the edge of the cover 130, and the fitting groove (at the edge of the case 110). The fitting protrusion 115 fitted to the 135 is formed.

Through the uneven coupling of the fitting protrusion 115 and the fitting groove 135 can be sealed inside the housing 100 without using a separate sealing member, it is possible to reduce the cost of the assembly process is simple.

In addition, the outer wall 131 or the inner wall 133 preferably has an inclination θ for elastically pressing the inner surface or the outer surface of the fitting protrusion 115.

Such inclination θ can act as a wedging, eliminating the gap between the uneven coupling and more securely sealing the interior of the housing 100.

The fitting protrusion 115 also needs to be embodied in a shape having an inclination so that the width thereof becomes narrower as it goes up to facilitate the initial insertion into the fitting groove 135.

In addition, the inner surface of the fitting protrusion 115 is formed with an inner locking jaw 114 to be caught by the lower end 134 of the inner wall 133, the outer surface of the fitting protrusion 115 on the inner surface of the outer wall 131. It is preferable that the outer engaging jaw 112 is formed to take the formed step 132.

The inner locking jaw 114 and the outer locking jaw 112 is a step coupling between the lower end 134 and the step 132, the inner sealing of the housing 100 can be more surely performed.

As shown in FIGS. 3 and 4, the driving unit 300 includes a worm 310 coupled to a rotation shaft of the motor 700, a friction gear assembly 330 engaged with the worm 310, and a friction gear assembly ( Cam mechanism 350 for converting the rotational power of the 330 to the rock pin 500 in a linear motion.

The worm 310 is a drive gear, and the tip of the shaft 311 is rotatably housed in the support groove 117 formed in the case 110 as shown in FIGS. 2A and 2B.

In addition, as shown in Figure 12 and 13, the cover 130 is formed with a blocking projection 137 to block the upper surface of the support groove 117, the front end of the shaft 311 is constrained up, down, left, right and front The rotation force of the motor 700 is stably provided to the friction gear assembly 330.

The friction gear assembly 330 is located on the same rotation shaft 331 as the worm wheel 330a and the worm wheel 330a as the first gear to be engaged with the worm 310 as shown in FIGS. 6 and 7. Engagement that is formed on the friction gear 330b, the second gear, the spring 330c installed on the worm wheel 330a, and the friction gear 330b, and engages with the spring 330c so as to interlock with each other. It is comprised by the projection 330d. Engagement has a tight fit and a slightly loose fit.

The spring 330c includes a split ring 331c having both ends separated and expanded in close contact with the worm wheel 330a, and two bending pieces 333c and 333c having both ends of the split ring 331c bent toward the inner ring (inner circumference). It is composed of ').

The engaging projection 330d is arranged between the bending piece 333c and the bending piece 333c 'as shown in FIG.

The engagement protrusion 330d is preferably implemented in a fan shape such as a shape between the bending piece 333c and the bending piece 333c '.

6 and 7, the first extension pipe 331a protrudes upward in the direction of the center of rotation on the upper surface of the worm wheel 330a.

In addition, a receiving groove 333a is formed in the inner wall of the first extension pipe 331a to accommodate the outer ring (outer circumference) side of the split ring 330c.

In addition, the engaging projection 330d is disposed as deep as possible between the bending piece 333c and the bending piece 333c 'as much as possible, and the area of contact with the bending piece 333c or the bending piece 333c' is large so that This is because delivery is certainly performed.

Due to this deep arrangement, the groove 335a is preferably formed at the bottom of the upper surface of the worm wheel 330a as shown in FIG. 7.

The groove 335a is configured to reduce frictional resistance during rotation by allowing a part of the lower end surface of the engaging protrusion 330d to contact the receiving groove 333a and not remaining.

Of course, when the bottom surface of the engaging projection 330d does not touch the receiving groove 330a, the groove 335a may not be formed.

On the lower surface of the friction gear 330b, a second extension tube 331b is formed to protrude from the outer circumferential surface of the first extension portion 331a.

In addition, the lower surface of the friction gear 330b is preferably formed with an inner protruding frame 333b connected to both sides of the engaging projection 330d while the outer circumferential surface is fitted to the inner circumferential surface of the first extension portion 331a.

On the other hand, it is preferable that the reinforcement rotating shaft 337a protrudes from the upper surface of the worm wheel 330a, and the reinforcing support groove 337b into which the reinforcing rotating shaft 337a is inserted and formed is formed on the lower surface of the friction gear 330b. .

The rotation center shaft of the worm wheel 330a and the friction gear 330b is rotatably supported by the shaft 331 fixed to the case 110.

The operation of the friction gear assembly 330 will be described.

Usually, the friction gear assembly 330 receives the rotational power of the worm 310 as one body and transmits it to the cam mechanism 350 to move the lock pin 500 forward or backward.

That is, when the worm wheel 330a engaged with the worm 310 rotates in the counterclockwise direction as shown in FIG. 8 (b), the spring 330c is bent while rotating as one body with the worm wheel 330a by the static friction force. The lock pin 500 slides through the cam mechanism 350 because the piece 333c pushes and rotates the engagement protrusion 330d.

When an abnormality such as the lock pin 500 is prevented from moving forward due to a foreign material, the worm wheel 330a tries to rotate while the friction gear 330b is fixed.

The spring 330c should also rotate with respect to the rotation of the worm wheel 330a, but the engaging protrusion 330d is blocking, so that the bending piece 333c compresses slightly further inward as shown in FIG. A portion of the outer ring side of 331c is also compressed inward to fall from the receiving groove 330a.

In this way, it acts to protect the gears by not giving the gears the stopping force due to the static friction force at the beginning of the operation (i.e., it protects the gear because the maximum static friction is lower than the conventional friction spring).

In this separated state, the worm wheel 330a rotates only with the worm wheel 330a while the slippage occurs with the spring 330c, and the spring 330c and the friction gear 330b are kept in a non-rotating state, thereby providing a motor 700. ) To prevent overload.

The cam mechanism 350 includes a cam gear 351 having an eccentric pin 352 as shown in FIG. 9, and a slider 353 having a long cam groove 354 into which the eccentric pin 352 is inserted. do.

The lock pin 500 is provided in the slider 353.

On the other hand, a switch 650 for monitoring the distance forward and backward of the slider 353 is provided on the lower surface of the PCB 600 as shown in FIG.

That is, a switching piece 660 for switching the switch 650 is suspended below one side of the slider 353, and the switch 650 is operated while the switching piece 660 moves along with the forward and backward movement of the slider 353. Let's do it.

In addition, the lower end of the switching piece 660 is installed in a guide rail groove (not shown) formed in the bottom of the case 110, the guide rails 661 are formed.

In addition, the cam gear 351 is formed as a kind of sector gear in which a tooth is formed in part.

The cam mechanism 350 rotates the slider 353 while the eccentric pin 352 rotates in the cam groove 354 when the cam gear 351 rotates in the unlocked state (lock pin retreats) as shown in FIG. 2A. It linearly moves in the forward direction as shown in Figure 2b.

Of course, a guide groove 355 guided to a guide rail (not shown) formed on the cover 130 is formed on the upper surface of the slider 353, so as to be stably guided up and down together with the switching piece 660.

In addition, the opening 101 also serves as a guide for the linear motion of the lock pin 500.

The cam gear 351 is provided in the stop plate 400 described later.

The cam mechanism 350 also has a greater force for pushing the lock pin 500 than the conventional rack and pinion mechanism.

That is, if the force for pushing the lock pin by the rack and pinion mechanism is 1, the cam mechanism 350 is 1 / cosθ.

In addition, since 0 <θ <90 ° as in FIG. 2A, 1 / cosθ is always greater than 1.

By adopting and combining the cam mechanism 350 which gives such a large force, it is possible to fully advance and retract the lock pin 500 without intervening the intermediate gear as in the prior art, and the housing 100 of the housing 100 can be as much as the space of the intermediate gear. The size can be reduced.

In addition, the cam gear 351 is rotatably installed on the shaft 420 of the intermediate plate 400 to prevent the width from being widened.

Meanwhile, as illustrated in FIGS. 2A to 4, the terminal box 800 having the PCB 600 electrically connected to the driver 300 and the terminals 810 connected to the PCB 600 are directly or indirectly connected. It is.

In particular, the PCB 600 is disposed on the stop plate 400, as shown in FIGS. 2A-5B.

That is, the motor 700 is connected to the PCB 600, and the intermediate plate 400 is disposed between the motor 700 and the PCB 600.

Therefore, as shown in FIG. 3, the motor 700, the intermediate plate 400, and the PCB 600 are arranged in a structure in which they are stacked up and down with each other, thereby reducing the charge space of the PCB 600.

Since the intermediate plate 400 and the PCB 600 have a thin plate shape, the height of the housing 100 is very fine and does not correspond to the occupied space as a whole.

On the other hand, the case 110 is formed with a receiving hole 120 for receiving the terminal box 800 as shown in FIG.

Due to the configuration of the receiving hole 120, the terminal box 800 can also be stored in a state arranged in the rear side of the motor 700, it is possible to implement a narrow housing 100 narrow.

In addition, a plurality of bushes 410 and 430 through which the lead wires 710 and 730 connecting the motor 700 and the PCB 600 are inserted are formed at the rear side of the stop plate 400. Do.

The bushes 410 and 430 prevent the movement of the stop plate 400 by the lead wires 710 and 730 to maintain a stable position.

In addition, a pillar 401 is formed in the stop plate 400, and an insertion hole 601 into which the pillar 401 is inserted is formed in the PCB 600.

By inserting the insertion hole 601 into the pillar 401, the PCB 600 is also prevented from moving or shaking with respect to the stop plate 400.

The bottom surface 403 of the front side of the stop plate 400 is supported by the support groove 122 formed on one side of the case 110 is fixed to the front and rear stably.

The first catching piece 405 and the second catching piece 407 are formed at one front side of the stop plate 400, and the catching wall 124 and the second catching piece 405 are caught in the case 110. An insertion groove 126 into which the locking piece 407 is inserted is formed, so that the front side of the stop plate 400 is securely fixed to the case 110.

On the other hand, as shown in FIG. 5B, the stopper 450U (450L) which controls the upper limit (maximum advance of the lock pin) and the lower limit (maximum retraction of the lock pin) rotation amount of the cam gear 351 with respect to the stop plate 400. Is preferably formed.

The upper limit stopper 450U includes a first movable protrusion 451U protruding outside the cam gear 351 and a first fixed protrusion 453U formed on the stop plate 400 and caught by the first movable protrusion 451U. Consists of.

The lower limit stopper 450L has a second movable circular arc groove 451L formed at the bottom of the cam gear 351 and a second fixing groove formed at the stop plate 400 to allow rotation in the second movable groove 451L. It consists of the projections 453L.

In addition, an arc inner wall 412 and an arc outer wall 414 are formed on the stop plate 400.

A first fixing protrusion 453U is formed on the inner side surface of the arc inner wall 412.

In addition, the outer surface of the inner wall 412 of the arc is formed with a locking jaw 416 is engaged with the locking projection 413 of the manual unlocking lever 470 described later, as shown in Figure 9, the operation of the manual unlocking lever 470 It acts as a stopper that can rotate as far as possible.

On the other hand, the cam gear 351, the manual unlock lever 470 is further assembled, it is possible to manually retract the lock pin 500 to release the lock.

As shown in FIGS. 2A and 9, the manual unlocking lever 470 is installed on the ring 471, the unlocking protrusion 473 formed on the inner surface of the ring 471, and the outer surface of the ring 471. It is composed of a pull ring 475.

On the upper surface of the cam gear 351, a protruding disk 357 into which the inner surface of the ring 471 is fitted is formed.

On the protruding disc 353, a lock release groove jaw 359 to which the lock release protrusion 473 is engaged is formed.

Therefore, when pulling the string (not shown) out of the housing 100, when the pull ring 475 is pulled and the ring 471 rotates, the unlocking projection 473 is the unlocking groove jaw (359) Force to rotate together.

In addition, the ring 471 is formed with a first ring guide 471a guided along the outer surface of the arc inner wall 412, and a second ring guide 473a guided along the inner surface of the arc outer wall 414. have.

Therefore, the rotation of the manual unlocking lever 470 is reliably guided by the first ring guide 471a and the second ring guide 473a.

As described above, although described with reference to a preferred embodiment of the present invention, the present invention can be variously changed or modified within the scope without departing from the spirit and scope of the present invention described in the claims Those skilled in the art will appreciate.

100 housing 101 opening
101a, 101b: semicircular opening 103a: mounting groove
103,104: fastening protrusion 105: locking jaw
106: fastening hook jaw 110: case
112: outer locking jaw 114: inner locking jaw
115: fitting protrusion 117: support groove
120: receiving hole 122: support groove
124: blocking wall 126: insertion groove
130: cover 131: outer wall
132: step 133: inner wall
134: bottom 135: fitting groove
137: blocking projection 300: drive unit
310: worm 311: shaft
330: friction gear assembly 330a; Worm wheel (first gear)
330b: Friction gear (second gear) 330c: spring
331a: First Extension Officer 333a: Reception Home
331b: second extension pipe 333b: inner protruding frame
337a: reinforcement shaft 337b: reinforcement support groove
331c: Split ring 333c, 333c ': Bending piece
330d: engagement protrusion 331c: split ring
335a: groove 331: shaft (rotation shaft)
350: cam mechanism 351: cam gear
352: eccentric pin 353: slider
354: cam groove 355: guide groove
357: protruding disc 359: lock release groove jaw
400: stop plate 401: pillar
403: Bottom 405, 407: First and Second Fasteners
420: shaft 410,430: bush
412: inner wall of the arc 413: obstacle
414: outer wall of the arc 416: locking jaw
450U: Upper limit stopper 451U: First movable projection
453U: 1st fixing protrusion 450L: Lower limit stopper
451L: 1st movable arc groove 453L: 2nd fixing protrusion
470: manual unlocking lever 471: ring
471a, 473a: Ring guide 473: Lock release protrusion
475: pull string 500: rock pin
510: O-ring 600: PCB
601: insertion hole 650: switch
660: Switching Piece 661: Guide Rail
700: Motor 710,730: Lead Wire
800: terminal box 810: terminal

Claims (8)

A first gear that receives rotational power;
A second gear having the same rotation axis as that of the first gear;
A spring installed on the first gear;
And an engaging portion formed in the second gear and engaging with the spring.
The spring is composed of a split ring which is in close contact with the first gear and two bent pieces of which both ends of the split ring are bent to the inner ring side,
And the engagement portion is disposed between the bent piece and the bent piece.
The method according to claim 1,
The first extension tube protrudes upward from the upper surface of the first gear,
The inner wall of the first extension pipe is formed with a receiving groove for receiving the outer ring side of the split ring,
And a second extension tube protruding from the lower surface of the second gear to the inner circumferential surface of the first extension portion.
The method according to claim 2,
And an inner protruding frame connected to both sides of the engaging portion while the outer peripheral surface is fitted to the inner peripheral surface of the first extension portion.
The method according to any one of claims 1 to 3,
A reinforcement rotating shaft protrudes from an upper surface of the first gear,
And a reinforcement support groove in which the reinforcement rotating shaft is inserted and supported at a lower surface of the second gear.
A housing comprising a case and a cover covering an upper surface of the case;
A lock pin installed in the opening formed in the housing;
A drive unit mounted to the housing to move the lock pin forward and backward;
Including; a motor for providing power to the drive unit;
The drive unit is composed of a worm coupled to the rotation shaft of the motor, a friction gear assembly for engaging the worm, and a motion conversion mechanism for converting the rotational power of the friction gear assembly into the linear motion to the lock pin,
The friction gear assembly may include a first gear engaged with the worm; A second gear having a same rotation axis as that of the first gear and meshing with the motion conversion mechanism; A spring installed on the first gear; And engaging portions formed on the second gear and engaging with the springs,
The spring is composed of a split ring which is in close contact with the first gear and two bent pieces of which both ends of the split ring are bent to the inner ring side,
The engagement portion is a door lock device for a washing machine disposed between the bending piece and the bending piece.
The method according to claim 5,
The first extension tube protrudes upward from the upper surface of the first gear,
The inner wall of the first extension pipe is formed with a receiving groove for receiving the outer ring side of the split ring,
The lower door of the second gear is a door lock device for a washing machine in which a second extension tube is inserted into the outer circumferential surface of the first extension portion protruding.
The method of claim 6,
And an inner protruding frame connected to both sides of the engaging portion while an outer circumferential surface is fitted to an inner circumferential surface of the first extension part, and formed on the lower surface of the second gear.
The method according to any one of claims 5 to 7,
A reinforcement rotating shaft protrudes from an upper surface of the first gear,
And a reinforcing support groove in which the reinforcement rotating shaft is inserted and supported on a lower surface of the second gear.

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