WO2017133488A1

WO2017133488A1 - Clutch control method and speed reduction clutch for washing machine

Info

Publication number: WO2017133488A1
Application number: PCT/CN2017/071905
Authority: WO
Inventors: 任强军; 薛昌辉; 缪立春
Original assignee: 浙江三星机电股份有限公司
Priority date: 2016-02-01
Filing date: 2017-01-20
Publication date: 2017-08-10

Abstract

Disclosed are a clutch control method and speed reduction clutch for a washing machine. The washing machine comprises a clutch mechanism, wherein the clutch mechanism comprises a clutch holding spring (1200), an upper ratchet wheel (1102), a lower ratchet wheel (1101), a first pawl (202), and a second pawl (203). The lower ratchet wheel (1101) rotates in the same direction as the clutch holding spring (1200) after being mounted, and the upper ratchet wheel (1102) rotates in a direction opposite to that of the clutch holding spring (1200) after being mounted. When the first pawl (202) is fastened with the lower ratchet wheel (1101) and the second pawl (203) is fastened with the upper ratchet wheel (1102), the clutch holding spring (1200) is released, and washing is implemented. When the first pawl (202) is separated from the lower ratchet wheel (1101) and the second pawl (203) is separated from the upper ratchet wheel (1102), the clutch holding spring (1200) is tightened, and spin-drying is implemented. The clutch control method comprises: the washing machine executing a washing/rinsing procedure, and controlling the first pawl (202) and the lower ratchet wheel (1101) to start fastening before the second pawl (203) and the upper ratchet wheel (1102) start fastening. The control method is integrated with the relationship between the working process of the washing machine and the action of the clutch mechanism, thus making the clutch mechanism more stable.

Description

Washing machine clutch control method and deceleration clutch

Technical field

The present invention relates to the field of washing machine technology, and in particular to a washing machine clutch control method and a deceleration clutch.

Background technique

The clutch structure belongs to the core part of the deceleration clutch of the washing machine, and the clutch realizes the mutual conversion of the washing machine from the washing and dehydrating state without stopping the machine mainly depends on the clutch mechanism. The clutch mechanism includes a pawl arm, a brake arm, a ratchet, and a pawl. Usually we use a single pawl, ratchet clutch structure, the pawl arm is fastened to the pawl, the pawl is connected with the ratchet drive, and the ratchet is connected with the clutch retaining spring drive.

The clutch spring of the single pawl and the ratchet clutch has two loops at one end and a radial thread end at the other end, which is embedded in the radial groove of the ratchet. During washing, the pawl on the pawl arm catches the ratchet, and the clutch spring is released. When dehydrating, the pawl on the pawl arm disengages the ratchet, and the clutch spring holds the brake wheel cover and the torque bushing. . The clutch structure is suitable for a clutch with a one-way bearing. For example, when there is no one-way bearing, in the washing, due to the following rotation of the inner tub, in order to ensure that the pawl can effectively catch the ratchet and ensure the release state of the clutch spring, it is necessary to adopt More efficient clutch structure.

The clutch structure adopting the double ratchet pawl is an effective method for solving the damage of the clutch structure caused by the inner bucket following phenomenon when the one-way bearing is not used. In the existing clutch structure of the double ratchet pawl, the two pawls are generally engaged and separated at the same time. In this way, when the washing machine works normally, no problem occurs, but if the clutch structure appears If it is not completely completed, the clutch may be damaged when it starts working.

In view of this, the present invention has been specifically proposed.

Summary of the invention

In order to solve the above problems, a first object of the present invention is to provide a method for controlling a clutch of a washing machine. Specifically, the following technical solution is adopted:

A washing machine clutch control method, the washing machine comprising a clutch mechanism, the clutch mechanism comprising a clutch spring, an upper ratchet, a lower ratchet, a first pawl and a second pawl, the lower ratchet mounted and the clutch spring The rotation direction is the same, and the upper ratchet is opposite to the rotation direction of the clutch spring, the first pawl is engaged with the lower ratchet, and when the second pawl is engaged with the upper ratchet, the clutch spring is loosened to achieve washing. The first pawl is separated from the lower ratchet, and when the second pawl is separated from the upper ratchet, the clutch spring is tightened to achieve dehydration; the clutch control method includes:

The washing machine executes a washing/rinsing process to control the first pawl to engage with the lower ratchet before the second pawl and the upper ratchet begin to engage.

Further, the washing machine performs a washing/rinsing process, when the depth of the first pawl entering the lower ratchet exceeds 1/5 tooth depth, preferably, when the tooth depth exceeds 1/3 tooth depth, the second pawl starts to engage with the upper ratchet .

Further, the clutch control method further includes:

The washing machine executes a dehydration process, and controls the second pawl to start separating from the upper ratchet before the first pawl and the lower ratchet begin to separate.

Further, the washing machine performs a dehydration process, and when the second pawl is away from the top of the upper ratchet by more than 0.5 mm, the first pawl and the lower ratchet begin to separate.

A second object of the present invention is to provide a washing machine reduction clutch, and in particular, the following technical solution is adopted:

The invention relates to a washing machine deceleration clutch, wherein the clutch mechanism comprises a clutch spring, an upper ratchet, a lower ratchet and a pawl arm, and the upper ratchet and the lower ratchet are respectively sleeved on the two ends of the clutch spring and are linked therewith, and the pawl arm is arranged a first pawl and a second pawl, the first pawl corresponding to the lower ratchet, and the second pawl corresponding to the upper ratchet; the first pawl is engaged with the lower ratchet, and when the second pawl is engaged with the upper ratchet The clutch spring is loosened to achieve washing, and the first pawl is separated from the lower ratchet. When the second pawl is separated from the upper ratchet, the clutch spring is tightened to achieve dehydration; the first pawl and the second pawl are The relative angle between the two is satisfied: the washing machine performs a washing/rinsing process, and the first pawl and the lower ratchet begin to engage before the second pawl and the upper ratchet begin to engage; The washing machine performs a dehydration process, and the second pawl and the upper ratchet begin to separate before the first pawl and the lower ratchet begin to separate.

Further, the first pawl has a first acting surface that abuts against the lower ratchet when engaged, and the second pawl has a second acting surface that abuts the upper ratchet when engaged; the first action The angle between the face and the second active surface is 135° to 165°.

Further, the pawl arm comprises a connecting portion and an arm body, the connecting portion is mounted on the rotating shaft and rotatable around the center thereof, the free end of the arm body is provided with a first pawl, and the middle portion of the arm body is provided with a second spine claw.

Further, the first pawl is fixedly disposed on the arm body, and the second pawl is elastic structure or movable relative to the arm body.

Further, the second pawl is rotatably disposed on the arm body, and the second pawl rotates in a direction opposite to the direction in which the upper ratchet rotates during dehydration.

Further, the present invention further includes a reduction gear train and a casing; the reduction gear train is disposed in the casing, and a bearing seat is disposed on an end of the casing adjacent to the upper ratchet; the pawl arm is further provided with a positioning mechanism, the bearing seat The outer ring surface is the positioning surface of the positioning mechanism, and when the positioning mechanism is in contact with the outer ring surface of the bearing seat, the pawl cutting depth and the positioning accuracy of the pawl are defined.

A washing machine deceleration clutch comprises a reduction gear train, a housing and a clutch mechanism; the clutch mechanism is a ratchet pawl clutching manner, comprising a ratchet wheel and a pawl arm, and the pawl arm is arranged to be engaged/separated with the ratchet wheel a decelerating/dehydrating pawl; the deceleration wheel is disposed in the casing, and a bearing seat is disposed on one end of the casing near the ratchet; the pawl arm is further provided with a positioning mechanism, and the outer ring surface of the bearing seat is positioned The positioning surface of the mechanism, when the positioning mechanism is in contact with the outer ring surface of the bearing housing, defines the depth at which the pawl is cut into the ratchet and the positioning accuracy of the pawl.

Further, the clutch mechanism includes a clutch spring, an upper ratchet, a lower ratchet and a pawl arm, and the upper ratchet and the lower ratchet are respectively sleeved on the two ends of the clutch spring and interlocked therewith, and the first spine is disposed on the pawl arm a claw and a second pawl, the first pawl corresponding to the lower ratchet, the second pawl corresponding to the upper ratchet; the first pawl engaging with the lower ratchet, and the second pawl engaging with the upper ratchet, the clutch retaining spring Release, to achieve washing, the first pawl is separated from the lower ratchet, and when the second pawl is separated from the upper ratchet, the clutch spring is tightened to achieve dehydration; the positioning mechanism is used for the first pawl to engage the lower ratchet, After the second pawl is engaged with the ratchet, the number of teeth of the ratchet arm is controlled to move the ratchet.

Further, the pawl arm comprises a connecting portion and an arm body, the connecting portion is mounted on the rotating shaft and rotatable around the center thereof, the free end of the arm body is provided with a first pawl, and the middle portion of the arm body is provided with a second spine a claw, the positioning mechanism being disposed between the first pawl and the second pawl.

Further, the positioning mechanism includes a connecting arm and a positioning block, and the connecting arm is integrally formed with the arm body of the pawl arm. The connecting arm is disposed on the arm body of the pawl arm near the side of the housing, and the positioning block is disposed at the connection. An end of the arm extending toward the housing, the positioning block protruding from the inner side surface of the connecting arm; the positioning block having a positioning surface in contact with the outer ring surface of the bearing housing.

Further, the connecting arm is formed by a convex plane extending from the inner side wall of the arm of the pawl arm toward the side of the housing, and the upper surface of the convex plane is provided with a plurality of reinforcing ribs, and the reinforcing ribs are connected to the convex plane. The free end and the outer side wall of the arm of the pawl arm.

Further, the positioning mechanism further includes an elastic cushion, and the elastic cushion is disposed on the positioning surface of the positioning block.

Further, the positioning block has a circular arc surface, and the circular arc surface can be in contact with the outer ring surface of the bearing seat. Preferably, the circular arc angle corresponding to the circular arc surface of the positioning block is 20°. 40°.

Further, the width of the positioning block is 1/3 to 2/3 of the outer ring width of the bearing housing, preferably 1/2 to 2/3.

Further, when the positioning mechanism is in contact with the outer ring surface of the bearing housing, the depth of the pawl deep into the tooth of the ratchet satisfies: the tooth height of the 1/3 ratchet to the tooth height of the 3/4 ratchet.

Further, the first pawl is fixedly disposed, the second pawl is rotatably disposed; the second positioning mechanism is disposed on the pawl arm, and the second positioning mechanism is disposed adjacent to the second pawl, and is defined The positioning accuracy of the pawl; the side of the pawl arm adjacent to the bearing seat extends out of the reinforcing rib structure, and the reinforcing rib structure has a positioning surface near the second pawl.

A washing machine deceleration clutch comprises a brake belt, the brake band comprises a belt body, and the belt body has a flat strip structure, at least one end of the belt body is mounted on the brake arm, and the end of the belt body connected to the brake arm The bending portion has a reverse bending portion, and a mounting hole is formed between the bending portion and the belt body, and the free end of the bending portion and the belt body are welded to form an integral structure.

Further, the bent portion has at least three solder joints between the strip and the strip.

Further, the width of the strip at the mounting hole is narrowed, and the free end of the bent portion is the same as the width of the strip. The bent portion has three solder joints between the strip and the two solder joints. Where the bent portion is the same as the width of the strip body, and symmetrically disposed on both sides of the center line of the strip body, and the other solder joint is disposed at a narrowed width of the strip body.

Further, the two ends of the strip body are respectively mounted on the brake arm, and the two ends of the strip body respectively have a bent portion which is reversely bent, and the bent portions at the two ends respectively form a mounting hole with the strip body, and two The free end of the end bent portion is welded to the belt body to form an integral structure.

Further, one end of the strip body is a first bent portion corresponding to the first mounting hole; the other end is a second bent portion corresponding to the second mounting hole; the first mounting hole is mounted on the system The distal end of the boom, the length of the first bent portion is longer than the second bent portion.

Further, the first bent portion and the strip body have a first solder joint, a second solder joint and a third solder joint, and the first solder joint is disposed adjacent to the first mounting hole; the second bend is a fourth solder joint, a fifth solder joint and a sixth solder joint between the portion and the strip, the fourth solder joint is disposed adjacent to the second mounting hole; the distance between the first solder joint and the first mounting hole is equal to The distance between the fourth solder joint and the second mounting hole.

Further, the distance between the second solder joint and the third solder joint is equal to the distance between the fifth solder joint and the sixth solder joint.

Further, the diameter of the solder joint between the bent portion and the strip body is not less than 4 mm.

Further, the belt body is provided with a reinforcing rib, and the reinforcing rib is disposed along a center line of the belt body, and the length of the reinforcing rib is not less than 85% of the length of the belt body.

In the washing and controlling method of the washing machine of the present invention, when the washing/rinsing is performed, the first pawl and the lower ratchet are controlled to start to engage, and the second pawl and the upper ratchet are engaged to start, so that the first pawl and the lower ratchet are realized first. In combination, since the lower ratchet is installed and the same as the clutch spring, the clutch spring is partially opened when the lower ratchet rotates. At this time, if the motor is started, the washing/rinsing can be realized without causing the clutch mechanism. damage.

Similarly, during dehydration, the second pawl is separated from the upper ratchet, and the clutch spring is still open. At this time, if the motor is started, the clutch spring does not rotate with the shaft, even if the first pawl is not with the lower ratchet Separation will not cause "toothing" and will not cause damage to the clutch mechanism.

Therefore, the clutch control method of the washing machine of the present invention combines the working relationship between the working process of the washing machine and the clutch mechanism to make the clutch mechanism more stable.

The first pawl and the second pawl of the washing machine reduction clutch of the present invention are arranged to satisfy the first pawl "first in and out" during the rotation of the pawl arm, ensuring the overall stability of the clutch mechanism.

In the deceleration clutch of the present invention, a positioning mechanism is disposed on the pawl arm, and the positioning mechanism uses the outer ring surface of the bearing seat of the housing end of the reduction gear train as a positioning surface, and the machining precision of the bearing seat is high, and the bearing seat is Under the condition of parameter determination, the design of the positioning mechanism is more convenient, and the pawl arm can be effectively positioned to avoid the deviation of the pawl on the pawl arm during the opening and resetting of the pawl arm, thereby ensuring the clutching effect of the clutch.

The brake belt of the deceleration clutch of the invention replaces the existing riveting method at both ends of the belt body with welding, and does not need to consider the setting of the riveting hole of the riveting, and can shorten the connection length of the two ends of the belt body to some extent, and can lengthen the belt body. The length of the upper rib is to avoid bending deformation when the brake band is formed by rolling, and the degree of tension of the brake band is ensured when the brake arm opens the brake band to disengage the brake wheel.

DRAWINGS

1 is a schematic structural view of a deceleration clutch of a washing machine of the present invention;

Figure 2 is a partial cross-sectional view of the washing machine reduction clutch of the present invention;

Figure 3 is a front elevational view of the pawl arm of the present invention;

Figure 4 is a left side view of the pawl arm of the present invention;

Figure 5 is a rear elevational view of the pawl arm of the present invention;

Figure 6 is a right side view of the pawl arm of the present invention;

Figure 7 is a cross-sectional view taken along line B-B of Figure 6 of the present invention;

Figure 8 is a cross-sectional view of the washing machine reduction clutch of the present invention;

Figure 9 is an exploded view of the clutch mechanism of the washing machine of the present invention;

Figure 10 is a schematic structural view of a brake belt of a deceleration clutch of the washing machine of the present invention;

Figure 11 is a top plan view of a brake belt of a deceleration clutch of a washing machine;

Figure 12 is a cross-sectional view showing a brake rib of a deceleration clutch of a washing machine of the present invention;

Figure 13 is a partial view of the mounting hole end of the brake belt of the deceleration clutch of the washing machine of the present invention.

DESCRIPTION OF REFERENCE NUMERALS: 100-pulley 200-pawl arm 201-connecting arm 202-first pawl 203-second pawl 204-mounting shaft 205-positioning block 206-connecting portion 207-arm body 208-fixed Hole 209 - second positioning mechanism 210 - positioning portion 211 - fixing nut 212 - washer 213 - return spring 300 - housing 301 - bearing housing 400 - brake arm 401 - first connecting shaft 402 - second connecting shaft 500 - shaft 600-reset mechanism 700-upper cover 800-water seal 900-output sleeve 1000-output shaft 1101-lower ratchet 1102-upper ratchet 1200-clutch retaining spring 1300-torque bushing 1400-input shaft 1500-brake wheel cover 1600-bearing 1700-brake wheel 1800-brake band 1801-belt 1802-first bent part 1803-first mounting hole 1804-reinforced rib 1805-first solder joint 1806-second solder joint 1807-third Solder joint 1808 - second bent portion 1809 - second mounting hole 1810 - fifth solder joint 1811 - sixth solder joint 1812 - fourth solder joint.

detailed description

A washing machine clutch control method and a reduction clutch of the present invention will be described in detail below with reference to the accompanying drawings:

Further, the washing machine performs a washing/rinsing process, and when the first pawl enters the in-tooth depth of the lower ratchet by more than 1/5 tooth depth, the second pawl starts to engage with the upper ratchet. Preferably, when the first pawl enters the in-tooth depth of the lower ratchet by more than 1/3 of the tooth depth, the second pawl and the upper ratchet begin to engage. In this way, it is ensured that the first pawl is engaged with the second pawl. When the first pawl is engaged, even if the motor is started, the washing/rinsing can be achieved without causing damage to the clutch mechanism.

A washing machine clutch control method according to the present invention further includes: the washing machine executes a dehydration process, and controls the second pawl to start separating from the upper ratchet before the first pawl and the lower ratchet start to separate.

Similarly, the second pawl is separated from the upper ratchet first, and the clutch spring is still open. At this time, if the motor is started, the clutch spring does not rotate with the rotating shaft, even if the first pawl is not separated from the lower ratchet, There will be a “toothing” phenomenon that will not cause damage to the clutch mechanism.

Further, the washing machine performs a dehydration process, and when the second pawl is away from the top of the upper ratchet by more than 0.5 mm, the first pawl and the lower ratchet begin to separate. In this way, it is ensured that the second pawl is separated from the first pawl. When the second pawl is separated, even if the first pawl is not separated, if the motor is started, no damage will be caused to the clutch mechanism.

As shown in FIG. 8 and FIG. 9, the present invention also provides a washing machine deceleration clutch. The clutch mechanism includes a clutch buck spring 1200, an upper ratchet 1102, a lower ratchet 1101 and a pawl arm 200, an upper ratchet 1102 and a lower ratchet. The first pawl 202 and the second pawl 203 are disposed on the pawl arm 200. The first pawl 202 corresponds to the lower ratchet 1101, and the second pawl 203 corresponds to the first pawl 202. The upper ratchet 1102; the first pawl 202 is engaged with the lower ratchet 1101, and when the second pawl 203 is engaged with the upper ratchet 1102, the clutch spring 1200 is loosened to achieve washing, When a pawl 202 is separated from the lower ratchet 1101, and the second pawl 203 is separated from the upper ratchet 1102, the clutch spring 1200 is tightened to achieve dehydration; the relative relationship between the first pawl 202 and the second pawl 203 is achieved. The angle is satisfied: the washing machine executes the washing/rinsing process, the first pawl 202 and the lower ratchet 1101 start to engage, and the second pawl 203 and the upper ratchet 1102 start to engage; the washing machine performs the dehydration process, the second pawl 203 and the upper ratchet The separation begins in 1102 prior to the first pawl 202 and the lower ratchet 1101 begin to separate.

The washing machine deceleration clutch of the present invention sets the first pawl 202 and the second pawl 203 at an appropriate angle such that, during washing/rinsing, the first pawl 202 and the lower ratchet 1101 are controlled to start to engage before the second The pawl 203 and the upper ratchet 1102 start to engage, so that the first pawl 202 and the lower ratchet 1101 are first combined. Since the lower ratchet 1101 is mounted and the same as the clutch spring 1200, the clutch spring 1200 is at this time. When the lower ratchet 1101 rotates, it is partially opened. At this time, if the motor is started, the washing/rinsing can be realized without causing damage to the clutch mechanism. Similarly, when dehydrating, the second pawl 203 is separated from the upper ratchet 1102 first. The clutch spring is still open, and if the motor is started, it will not damage the clutch mechanism.

In order to achieve the first pawl 202 and the second pawl 203 on the pawl arm 200 in sequence, the first pawl 202 has a first active surface that abuts the lower ratchet 1101 when engaged. The second pawl 203 has a second acting surface that abuts the upper ratchet 1102 when engaged; the angle between the first active surface and the second active surface is 135° to 165°.

As shown in FIG. 3, FIG. 4 and FIG. 5, the pawl arm 200 includes a connecting portion 206 and an arm body 207. The connecting portion 206 is mounted on the rotating shaft 500 and rotates around the center thereof, and the free end portion of the arm body 207 A first pawl 202 is provided, and a second pawl 203 is disposed in a middle portion of the arm body. The connecting portion 206 of the present invention has a fixing hole 208 on which the rotating shaft 500 is mounted.

As a preferred embodiment of the present invention, the first pawl 202 is fixedly disposed on the arm body 200, and the second pawl 203 is elastic or movable relative to the arm body.

In order to ensure the mold forming effect and control the depth of the pawl cutting into the ratchet, the elastic claw and the fixed claw are matched. It must be ensured that in the initial state, the two pawls are cut into the ratchet 1/3~3/4, preferably 1/2~3/4. In the dehydrated state, when the traction motor opens the brake arm 400, the two pawls need When the ratchet is disengaged, the pawl needs to be disengaged from the ratchet distance by ≥ 1.5 mm, preferably ≥ 2 mm.

The first pawl 202 of the present invention is fixedly disposed, the second pawl 203 is rotatably disposed; the second positioning mechanism is disposed on the pawl arm 200, and the second positioning mechanism is disposed adjacent to the second pawl 203. The rotation angle of the second pawl is defined to ensure the positioning accuracy of the pawl. The second positioning mechanism defines that the second pawl 203 can only rotate in one direction, ensuring overall stability of the clutch mechanism.

The second pawl 203 is rotatably mounted on the mounting shaft 204. The mounting shaft 204 is integrally formed with the arm body 207. The mounting shaft 204 is sleeved with a return spring 213. One end of the return spring 213 is abutted against the arm body 207, and the other end is The second pawl 203 is stopped, so that the second pawl 203 is reset to ensure normal engagement.

Specifically, a side of the pawl arm 200 adjacent to the bearing seat 301 extends a rib structure, and the rib structure has a positioning surface near the second pawl 203.

As shown in FIG. 1, FIG. 2, FIG. 8 and FIG. 9, in the washing state, the brake arm 400 is in an initial state, and the first pawl 202 on the pawl arm 200 is engaged with the lower ratchet 1101, and the second pawl 203 is engaged. Engaged with the upper ratchet 1102, the clutch clutch spring 1200 is released to release the brake wheel cover 1500 and the torque bushing 1300, and the motor drives the input shaft 1400 to rotate the output shaft 1000 through the reduction gear train to realize the washing/rinsing effect; In the dehydrated state, the traction motor pulls the brake arm 400 apart, the pawl arm 200 is opened correspondingly, the second pawl 203 is separated from the upper ratchet 1102, the first pawl 202 is separated from the lower ratchet 1101, and the clutch spring 1200 is tightened. The moving wheel cover 1500 and the torque bushing 1300, at the same time, the braking band 1800 releases the braking wheel 1700, so that the output shaft 1000 and the output bushing 900 as a whole are dehydrated by high-speed one-way rotation.

Embodiment 1

As shown in FIG. 1 , a washing machine deceleration clutch includes a reduction gear train, a housing 300 and a clutch mechanism; the clutch mechanism is a ratchet pawl clutching manner, including a ratchet and pawl arm 200, and the pawl arm 200 is disposed a pawl for engaging/disengaging with the ratchet to achieve washing/dehydration; the reduction gear train is disposed in the housing 300, and a bearing seat 301 is disposed on one end of the housing 300 near the ratchet; the pawl arm 200 is disposed A positioning mechanism is also provided. The outer ring surface of the bearing housing 301 is a positioning surface of the positioning mechanism. When the positioning mechanism is in contact with the outer ring surface of the bearing housing 301, the depth and pawl of the pawl can be ensured. Positioning accuracy.

Further exercise.

In the deceleration clutch of the embodiment, the pawl arm 200 is provided with a positioning mechanism, and the positioning mechanism is used as a positioning surface of the outer ring surface of the bearing housing 301 at the end of the housing 300 of the reduction gear train, because the machining precision of the bearing housing 301 is required. High, the design of the positioning mechanism is more convenient under the conditions determined by the parameters of the bearing housing 301, and the pawl arm 200 can be effectively positioned to avoid the offset of the pawl on the pawl arm 200 during the opening and resetting of the pawl arm 200, thereby Make sure the clutch is clutched.

The positioning method of the pawl arm 200 of the present invention is suitable for the existing washing machine deceleration clutch adopting the ratchet pawl clutching mode, including a single ratchet pawl type and a double ratchet pawl type. In the following embodiment, the double ratchet pawl type clutch mechanism is further illustrated as an example, but the embodiment is not limited to the double ratchet pawl type clutch mechanism.

As shown in FIG. 8, FIG. 9, and FIG. 2, the clutch mechanism includes a clutch spring 1200, an upper ratchet 1102, a lower ratchet 1101, and a pawl arm 200. The upper ratchet 1102 and the lower ratchet 1101 are respectively sleeved on the clutch spring 1200. And the linkage, the first pawl 202 and the second pawl 203 are disposed on the pawl arm 200, the first pawl 202 corresponds to the lower ratchet 1101, and the second pawl 203 corresponds to the upper ratchet 1102; the first pawl 202 is engaged with the lower ratchet 1101, and when the second pawl 203 is engaged with the upper ratchet 1102, the clutch spring 1200 is released to achieve washing, the first pawl 202 is separated from the lower ratchet 1101, and the second pawl 203 and the upper ratchet are separated. When the 1102 is separated, the clutch buck spring 1200 is tightened to achieve dehydration; the positioning mechanism is used for the first pawl 202 to engage the lower ratchet 1101, and the second pawl 203 to engage the upper ratchet 1102 to define further movement of the pawl arm 200. .

The deceleration clutch of the embodiment adopts the clutching mode of the double ratchet pawl. After the first pawl 202 engages the lower ratchet 1101 and the second pawl 203 engages the upper ratchet 1102, the positioning mechanism and the outer ring surface of the bearing housing 301 are The contact defines further movement of the pawl arm 200. On the one hand, the stability of the engagement of the first pawl 202 with the lower ratchet 1101, the second pawl 203 and the upper ratchet 1102 can be ensured, and on the other hand, the pawl can be avoided. The arm 200 is further moved to cause crush damage to the ratchet teeth or the pawl.

It can be seen that the setting manner of the positioning mechanism determines whether the ratchet pawl can be smoothly engaged and disengaged. Therefore, as shown in FIG. 3, FIG. 4 and FIG. 5, the pawl arm 200 includes the connecting portion 206 and the arm. The body 207 is mounted on the rotating shaft 500 and rotates around the center thereof. The free end of the arm body 207 is provided with a first pawl 202, and the middle of the arm body is provided with a second pawl 203. The positioning mechanism is disposed at Between the first pawl 202 and the second pawl 203.

In this embodiment, the positioning mechanism is disposed between the first pawl 202 and the second pawl 203, which is determined by the positional relationship after the ratchet pawl is engaged, because the first pawl 202 engages the lower ratchet 1101. After the two pawls 203 are engaged with the upper ratchet 1102, the portion between the first pawl 202 and the second pawl 203 on the pawl arm 200 and the two ratchets are in the same center, and the distance between the portion and the ratchet edge In the shortest, since the ratchet is disposed coaxially with the bearing housing 301, the distance between the portion between the first pawl 202 and the second pawl 203 on the pawl arm 200 and the bearing housing 301 is also the shortest. Therefore, in the present embodiment, the positioning mechanism is disposed between the first pawl 202 and the second pawl 203, and is more easily contacted with the outer ring surface of the bearing housing 301 to achieve positioning.

The connecting portion 206 of the present embodiment has a fixing hole 208 on which the rotating shaft 500 is mounted.

Specifically, the positioning mechanism includes a connecting arm 201 and a positioning block 205. The connecting arm 201 is integrally formed with the arm body 207 of the pawl arm 200. The connecting arm 201 is disposed on the arm body 207 of the pawl arm 200 near the housing 300. On one side, the positioning block 205 is disposed at one end of the connecting arm 201 extending toward the housing 300, and the positioning block 205 protrudes from the inner surface of the connecting arm 201; the positioning block 205 has contact with the outer ring surface of the bearing housing. Positioning surface. The deceleration clutch of the washing machine of the embodiment only protrudes from the positioning mechanism to the housing 300, thereby achieving contact with the bearing housing 301, which can save material of the pawl arm 200 and reduce cost.

Further, the connecting arm 201 is formed by a convex plane extending from the inner side wall of the arm body of the pawl arm 200 toward the side of the housing, and a plurality of reinforcing ribs are disposed on the upper surface of the convex plane, and the reinforcing ribs are connected and protruded. The free end of the plane and the outer side wall of the arm of the pawl arm. In this way, on the basis of ensuring the overall strength of the positioning mechanism, the material is reduced and the manufacturing cost is reduced.

Further, the positioning mechanism further includes an elastic cushion, and the elastic cushion is disposed on the positioning surface of the positioning block. Since the positioning block usually has a certain speed impinging on the outer ring surface of the bearing seat when positioning, the reverse impact force of the outer ring surface of the bearing seat is large at the moment of the positioning contact, which is easy to cause positioning. The block is broken. The invention can effectively reduce the punching of the outer ring surface of the bearing seat received by the positioning mechanism during positioning by the elastic cushion The force avoids the breakage between the positioning block and the connecting arm, on the one hand, ensuring the effectiveness of the positioning, and on the other hand, prolonging the service life of the positioning mechanism.

Further, the positioning block 205 has a circular arc surface that can be attached to the outer ring surface of the bearing housing 301. In this way, the positioning block 205 of the positioning mechanism can be ensured to be closely attached to the outer ring surface of the bearing housing 301 to ensure the stability of the positioning.

Further, the circular arc angle corresponding to the circular arc surface of the positioning block 205 is 20° to 40°, and the size of the positioning surface of the positioning block 205 is ensured to ensure the stability of the positioning.

Further, the width of the positioning block 205 is 1/3 to 2/3 of the outer ring width of the bearing housing 301, preferably 1/2 to 2/3, further ensuring the positioning surface area of the positioning block 205. The size ensures the stability of the positioning.

As a preferred embodiment of the embodiment, when the positioning mechanism is in contact with the outer ring surface of the bearing housing 301, the depth of the pawl deep into the tooth of the ratchet is satisfied: 1/3 of the ratchet height The tooth height of the 3/4 ratchet. Thus, on the one hand, deepening the tooth height of at least 1/3 of the ratchet ensures the effectiveness and stability of the engagement, on the other hand, deepening the tooth height of the ratchet less than 3/4, ensuring a smooth separation of the ratchet ratchet, meanwhile, Avoid severe damage to the teeth between the pawl and the ratchet to ensure the service life.

As shown in FIG. 6, the first pawl 202 of the embodiment is fixedly disposed, and the second pawl 203 is rotatably disposed; the second positioning mechanism 209 is disposed on the pawl arm 200, and the second positioning mechanism is disposed. 209 is disposed adjacent to the second pawl 203 for defining a rotational angle of the second pawl 203. The second positioning mechanism 209 defines that the second pawl 203 can only rotate in one direction, ensuring the overall stability of the clutch mechanism. Correspondingly, the second pawl 203 has a positioning portion 210 that cooperates with the second positioning mechanism 209.

As shown in FIG. 7, the second pawl 203 is rotatably mounted on the mounting shaft 204. One end of the mounting shaft 204 is fixed to the arm body 207, and the other end of the mounting shaft 204 is mounted with a fixing nut 211 to limit the second pawl. The axial movement of 203. The mounting shaft 204 or the pawl arm 200 is sleeved with a return spring 213. One end of the return spring 213 stops against the arm body 207, and the other end stops against the second pawl 203, so that the second pawl 203 is reset to ensure normal operation. Engage. Specifically, a side of the pawl arm 200 adjacent to the bearing seat 301 extends a rib structure, and the rib structure has a positioning surface near the second pawl 203.

The pawl arm 200 of the embodiment is positioned on the outer ring surface of the bearing housing 301 of the housing 300. Since the bearing housing 301 is subjected to precision drawing processing, the outer circle size accuracy is high, and the positioning surface is in the middle of the two pawls. It can be well ensured that the pawl arm 200 can be effectively positioned to prevent the two pawl positions on the pawl arm 200 from shifting during the opening and resetting of the pawl arm 200, thereby ensuring the clutching effect of the clutch.

Embodiment 2

As shown in FIG. 3, the positioning surface of the positioning mechanism of the pawl arm 200 of the present embodiment is 13 mm from the bottom plane height L1 of the fixing hole 208 of the pawl arm 200. As shown in FIG. 4 and FIG. 5, the positioning surface of the positioning mechanism of the pawl arm 200 is a circular arc surface centered on the center line H1 of the fixing arm 208 of the pawl arm 200, and the arc radius R is 20.8 mm. The angle α between the two sides is 27.6°, and the vertical line H1 is 57 mm at the center line of the fixing hole 208 of the pawl arm 200, and the straight line distance H2 is 11.4 mm and the thickness L2 is 5 mm.

Embodiment 3

As shown in Figures 10-13, the brake band is an important component of the brake clutch of the washing machine. The brake band is formed into a certain shape by rolling forming. When washing, the brake arm is in an initial state, and the brake band prevents the inner tub from following the brake by holding the brake wheel. In the dehydrated state, the brake band is on the brake arm. The traction wheel is released under traction, so that the output shaft and the dewatering shaft are integrated as a whole, and the high-speed one-way rotation achieves the purpose of centrifugal dewatering. In the washing state, the shape of the brake wheel after the roll forming needs to completely conform to the brake wheel, and in the dehydrated state, the brake belt needs a certain degree of tension to maintain the state of completely disengaging the brake wheel.

As shown in FIG. 10, a washing machine deceleration clutch brake belt includes a belt body 1801. The belt body 1801 has a flat strip structure, and at least one end of the belt body 1801 is mounted on the brake arm 400. The belt body 1801 is manufactured. One end of the boom 400 is connected with a bent portion which is bent in the opposite direction, and a mounting hole is formed between the bent portion and the belt body, and the free end of the bent portion is welded to the belt body to be integrally welded.

The washing machine deceleration clutch brake belt of the present invention connects the belt body 1801 and the brake arm 400 to the current riveting side. The type is changed to welding, and the setting of the riveting hole of the riveting is not necessary, the connection length of the end of the belt body 1801 can be shortened to some extent, the length of the reinforcing bar 1804 on the belt body can be lengthened, and the bending can be avoided when the brake band is rolled and formed. Deformation, and the degree of tension of the brake band is ensured when the brake arm 400 opens the brake band to disengage the brake wheel.

When the riveting method is adopted, since the setting position and size of the riveting hole have certain requirements, the fastening of the connection can be ensured. Therefore, when riveting is used, the connection length is relatively large. The invention replaces it with welding, and by heating the bent portion and the belt body 1801, and then heat-welding and pressing, the connection is integrated, the riveting hole is avoided, and the connection length is shorter.

In addition, the welding method is simpler and easier to implement.

Further, the bent portion has at least three solder joints between the bent portion and the strip body 1801. On the one hand, the strength of the connection can be ensured, and on the other hand, the process difficulty can be reduced.

The width of the strip at the mounting hole of the present invention is narrowed, the free end of the bent portion is the same as the width of the strip, the bent portion has three solder joints between the strip and the two solder joints are set at the bend The portion is the same as the width of the strip, and is symmetrically disposed on both sides of the center line of the strip, and the other solder joint is disposed at a narrowing of the width of the strip. The tape body 1801 is narrowed at the mounting hole in order to realize that the brake band is mounted on the brake arm 400, saving installation space.

The brake band of the present invention can be applied to a washing machine reduction clutch in which one end is fixed to the casing 300 and the other end is connected to the brake arm 400, and can also be applied to a washing machine reduction clutch which is respectively connected to the brake arm 400 at both ends.

As shown in FIG. 8 , FIG. 9 , FIG. 10 and FIG. 11 , a washing machine deceleration clutch braking band is applied to a washing machine deceleration clutch respectively connected to the brake arm 400 at both ends, and the strip body 1801 has two ends respectively Mounted on the brake arm 400, the two ends of the belt body respectively have a bending portion which is bent in the opposite direction, and the bending portions at the two ends respectively form a mounting hole with the belt body, and the free end and the belt body of the bent portion at both ends Welded into a single structure.

Further, one end of the strip body is a first bent portion 1802, corresponding to the first mounting hole 1803; the other end is a second bent portion 1808, corresponding to the second mounting hole 1809; the first installation The hole 1803 is mounted on the distal end of the brake arm 400, and the length of the first bent portion 1802 is longer than the second bent portion 1808. According to the structural feature of the brake band mounted on the brake arm 400, the present invention sets the length of the first bent portion 1802 and the length of the second bent portion 1808 to facilitate connection. Further, since the first mounting hole 1803 is mounted on the distal end of the brake arm 400, the length of the first bent portion 1802 is longer than the second bent portion 1808.

Specifically, the first mounting hole 1803 is mounted on the first connecting shaft 401, the second mounting hole 1809 is mounted on the second connection 402, and the second connection 402 is disposed inside the first connecting shaft 401.

Specifically, the first bent portion 1802 and the strip 1801 have a first solder joint 1805, a second solder joint 1806, and a third solder joint 1807. The first solder joint 1805 is disposed adjacent to the first mounting hole 1803. The second bent portion 1808 and the strip 1801 have a fourth solder joint 1812, a fifth solder joint 1810 and a sixth solder joint 1811, and the fourth solder joint 1812 is disposed adjacent to the second mounting hole 1809; The distance between the first solder joint 1805 and the first mounting hole 1803 is equal to the distance between the fourth solder joint 1812 and the second mounting hole 1809. This is to ensure the tightness of the connection near the mounting hole.

Further, the distance between the second solder joint 1806 and the third solder joint 1807 is equal to the distance between the fifth solder joint 1810 and the sixth solder joint 1811. In this way, the degree of fastening of the end of the bent portion is ensured.

Specifically, the diameter of the solder joint between the bent portion and the strip body is not less than 4 mm. This is to ensure the strength of the weld.

As a preferred embodiment of the present invention, the belt body is provided with a reinforcing rib 1804, and the reinforcing rib 1804 is disposed along the center line of the belt body, and the length of the reinforcing rib 1804 is not less than 85% of the length of the belt body. The brake band of the invention adopts the welding method, shortens the length of the joint, can lengthen the length of the reinforcing rib 1804 as much as possible, avoids bending deformation when the brake band is roll-formed, and opens the brake arm 400. The degree of tension of the brake band is ensured when the brake band is disengaged from the brake wheel.

The brake band of the invention adopts a welded connection, which saves space compared with the riveted connection, and the length of the reinforcing rib 1804 of the brake band can be lengthened accordingly, thereby ensuring the rigidity of the brake band and avoiding bending deformation when the brake band is rolled and formed. And the degree of tension of the brake band is ensured when the brake arm opens the brake band and disengages the brake wheel.

The invention implements the speciality of the working condition of the brake belt of the deceleration clutch of the washing machine, and optimizes the relationship between the size of the rib and the size of the brake band.

The reason for the limitation is that the brake band includes both the tightening and the loosening state in use. When braking, the brake band is subjected to a large tensile force by the brake arm pulling surface, and when it is released, it is The bending arm is under the push of the brake arm, which is repeated The force, as the use time is prolonged, may cause the brake band to plastically deform and cannot be restored.

However, the rib specifications in the prior art are often not carefully selected, and the conventional design rules are not satisfactory, because the usual rib setting only considers the torsion and bending resistance, but due to the brake band The work is curved and subjected to different forces of stretching and bending, so it is necessary to optimize the setting of the ribs on the brake band.

Specifically, as shown in FIG. 12, the thickness of the brake band is set to a width D ₀ of W ₀ . Reinforcing rib height H and a width of 1804 ₀ C ₀ D ₀ and the thickness of the brake band width W ₀ a certain relationship, for reinforcing rib height H of 1804 played function, in substantially locally increased braking band The thickness, that is, the torsional strength of the brake band is locally enhanced. However, if the height of the rib 1804 is too large, the strength of the rib 1804 is not increased, and it is easy to break or plastically deform. The inventors of the present invention have finally determined a large number of experiments to determine the rib. The height of the rib 1804 is in the range of D ₀ /2 ≤ H ≤ 2D ₀ .

Further, the selection of the width C ₀ of the rib 1804 and the width W _{0 of the} brake band have a certain relationship. If the width C _{0 of the} rib 1804 is too large, the friction area between the brake band and the brake wheel is reduced, and the influence is affected. Braking effect. If the width of the rib 1804 is too small, the strength may not be required, and the local stress may easily be excessively broken. Therefore, the inventors of the present application finally determined through a large number of experiments that the rib 1804 width C ₀ satisfies W ₀ /20 ≤ C ≤ W ₀ /5.

The above data is a more optimized configuration obtained by a person skilled in the art in a large number of experiments.

Further, the reinforcing rib 1804 is a stamped and formed structure, one side of which is a convex structure higher than the surface of the brake band, and the other side is a corresponding concave structure.

Further, the middle portion of the reinforcing rib 1804 is the highest portion, and both sides are symmetric inclined inclined inclined surfaces, and the inclination angle α _{0 of} the inclined surface is satisfied, 30°≤α ₀ ≤50°.

For the setting of the inclination angle α ₀ of the inclined surface, considering the two aspects of strength and toughness, if the inclination angle α _{0 is} too small to be close to the vertical state, although the strength is large, the reinforcing ribs are easily broken during the bending and twisting of the reinforcing rib 1804. If the inclination angle α _{0 is} too large, the toughness is large, but the strength is not enough, and the inclination angle α _{0 is} too large, which causes the bottom area of the rib 1804 to be excessively large, and the effective friction area of the brake band affects the braking effect. The inventors of the present application finally determined through a large number of experiments that the inclination angle a of the inclined surface satisfies 30° ≤ α ₀ ≤ 50°.

Further, a connecting edge of the two ends of the reinforcing rib and the surface of the braking band is an arc, and the rounded corner R ₀ is 1-1.5D ₀ .

The stress at the edge of the reinforcing rib at both ends of the strong rib is large. If a right angle is used, the crack is likely to occur during the press working, so the rounded corner is used. The inventors of the present application finally determined through a large number of experiments that the circular arc fillet R ₀ is 1-1.5D ₀ .

Further, the rib height is preferably H ₀ =0.8D ₀ .

This size is finally determined by a large number of experiments by the inventors of the present application, and the rib height is preferably H ₀ = _0.8 D ₀ .

Further, the rib width is preferably C ₀ = 3W ₀ /20.

This size is finally determined by a large number of experiments by the inventors of the present application, and the rib width is preferably C ₀ = 3W ₀ /20.

Further, the angle between the slopes on both sides of the reinforcing rib and the plane of the brake band is preferably α ₀ = 45°.

The size is determined according to a large number of experiments by the inventors of the present application, and the angle between the slopes on both sides of the reinforcing rib and the plane of the brake band is preferably α ₀ = 45°.

The present invention also provides a washing machine reduction clutch having the above-described deceleration clutch brake band.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any technology that is familiar with the present patent. Those skilled in the art can make some modifications or modifications to equivalent embodiments by using the technical content of the above-mentioned hints without departing from the technical scope of the present invention, but the technology according to the present invention does not deviate from the technical solution of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the present invention.

Claims

A washing machine clutch control method, the washing machine comprising a clutch mechanism, the clutch mechanism comprising a clutch spring, an upper ratchet, a lower ratchet, a first pawl and a second pawl, the lower ratchet mounted and the clutch spring The rotation direction is the same, and the upper ratchet is opposite to the rotation direction of the clutch spring, the first pawl is engaged with the lower ratchet, and when the second pawl is engaged with the upper ratchet, the clutch spring is loosened to achieve washing. The first pawl is separated from the lower ratchet, and when the second pawl is separated from the upper ratchet, the clutch spring is tightened to achieve dehydration; and the clutch control method includes:

The washing machine executes a washing/rinsing process to control the first pawl to engage with the lower ratchet before the second pawl and the upper ratchet begin to engage.
A washing machine clutch control method according to claim 1, wherein the washing machine executes a washing/rinsing program, and when the depth of the first pawl entering the lower ratchet exceeds 1/5 tooth depth, preferably more than 1/1 When the tooth depth is 3, the second pawl and the upper ratchet begin to engage.
The method for controlling a clutch of a washing machine according to claim 1 or 2, further comprising:

The washing machine executes a dehydration process, and controls the second pawl to start separating from the upper ratchet before the first pawl and the lower ratchet begin to separate.
The clutch control method of a washing machine according to claim 3, wherein the washing machine executes a dehydration process, and the first pawl and the lower ratchet start to separate when the second pawl is away from the top of the upper ratchet by more than 0.5 mm.
A washing machine deceleration clutch using the clutch control method according to any one of claims 1 to 4, wherein the clutch mechanism comprises a clutch spring, an upper ratchet, a lower ratchet and a pawl arm, and the upper ratchet and the lower ratchet are respectively sleeved a first pawl and a second pawl are disposed on the pawl arm at both ends of the clutch spring, the first pawl corresponding to the lower ratchet, and the second pawl corresponding to the upper ratchet; the first pawl and the first pawl When the lower ratchet is engaged, when the second pawl is engaged with the upper ratchet, the clutch spring is released to achieve washing, the first pawl is separated from the lower ratchet, and when the second pawl is separated from the upper ratchet, the clutch spring is tightened. Realize dehydration;

The feature is that the relative angle between the first pawl and the second pawl is such that the washing machine performs a washing/rinsing process, and the first pawl and the lower ratchet begin to engage before the second pawl and the upper ratchet start. Engagement; the washing machine performs a dehydration process, and the second pawl and the upper ratchet begin to separate before the first pawl and the lower ratchet begin to separate.
A washing machine deceleration clutch according to claim 5, wherein said first pawl has a first acting surface that abuts against the lower ratchet when engaged, and the second pawl has a catching time and an upper The second active surface of the ratchet is opposite to each other, and the angle between the first active surface and the second active surface is 135° 165°.
A washing machine reduction clutch according to claim 5 or claim 6, wherein said pawl arm comprises a connecting portion and an arm body, and the connecting portion is mounted on the rotating shaft and rotatable therearound, the free end of the arm body The first pawl is disposed, and the second pawl is disposed at a middle portion of the arm body.
A washing machine reduction clutch according to claim 7, wherein said first pawl is fixed Disposed on the arm body, the second pawl is elastic or movable relative to the arm body.
A washing machine reduction clutch according to claim 8, wherein said second pawl is rotatably disposed on the arm body, and the second pawl rotates in a direction opposite to the direction in which the upper ratchet rotates during dehydration.
A washing machine reduction clutch according to claim 5 or claim 6, further comprising a reduction gear train and a casing; wherein the reduction gear train is disposed in the casing, and the bearing seat is disposed on the casing near the end of the upper ratchet The pawl arm is further provided with a positioning mechanism. The outer ring surface of the bearing seat is a positioning surface of the positioning mechanism. When the positioning mechanism is in contact with the outer ring surface of the bearing seat, the pawl cutting depth and the positioning of the pawl are defined. Precision.
A washing machine deceleration clutch comprises a reduction gear train, a housing and a clutch mechanism; the clutch mechanism is a ratchet pawl clutching manner, comprising a ratchet wheel and a pawl arm, and the pawl arm is arranged to be engaged/separated with the ratchet wheel a decelerating/dehydrating pawl; the deceleration wheel is disposed in the casing, and a bearing seat is disposed on an end of the casing adjacent to the ratchet; wherein the pawl arm is further provided with a positioning mechanism, and the bearing seat is externally The surface of the ring is the positioning surface of the positioning mechanism. When the positioning mechanism is in contact with the outer ring surface of the bearing housing, the depth of the ratchet and the positioning accuracy of the pawl are defined.
A washing machine deceleration clutch according to claim 11, wherein said clutch mechanism comprises a clutch spring, an upper ratchet, a lower ratchet and a pawl arm, and the upper ratchet and the lower ratchet are respectively sleeved on the clutch spring. The first pawl and the second pawl are disposed on the pawl arm, the first pawl corresponds to the lower ratchet, and the second pawl corresponds to the upper ratchet; the first pawl is engaged with the lower ratchet, When the second pawl is engaged with the upper ratchet, the clutch spring is released to achieve washing, and the first pawl is separated from the lower ratchet. When the second pawl is separated from the upper ratchet, the clutch spring is tightened to achieve dehydration; The positioning mechanism is configured to control the number of teeth of the ratchet arm to move the ratchet after the first pawl engages the lower ratchet and the second pawl engages the ratchet.
A washing machine deceleration clutch according to claim 11 or 12, wherein said pawl arm comprises a connecting portion and an arm body, and the connecting portion is mounted on the rotating shaft and rotatable around the center thereof, and the arm body is free The end portion is provided with a first pawl, and the middle portion of the arm body is provided with a second pawl, and the positioning mechanism is disposed between the first pawl and the second pawl.
A washing machine reduction clutch according to claim 13, wherein said positioning mechanism comprises a connecting arm and a positioning block, and the connecting arm is integrally formed with the arm body of the pawl arm, and the connecting arm is disposed on the arm of the pawl arm a positioning block is disposed on a side of the body adjacent to the housing, and the positioning block is disposed at an end of the connecting arm extending toward the housing, and the positioning block protrudes from an inner side surface of the connecting arm; the positioning block has a positioning contact with an outer ring surface of the bearing housing surface.
A washing machine reduction clutch according to claim 14, wherein said connecting arm is formed by a convex plane extending from an inner side wall of the arm of the pawl arm toward a side of the housing, protruding from a plane The surface is provided with a plurality of reinforcing ribs, and the reinforcing ribs connect the free ends of the convex planes and the outer side walls of the arms of the pawl arms.
A washing machine deceleration clutch according to claim 14, wherein the positioning mechanism further comprises an elastic cushion, and the elastic cushion is disposed on the positioning surface of the positioning block.
A washing machine deceleration clutch according to claim 14, wherein said positioning block has a circular arc surface which is engageable with an outer ring surface of the bearing housing, preferably said positioning The central angle of the circular arc surface of the block is 20° to 40°.
A washing machine reduction clutch according to claim 14, wherein the width of the positioning block is 1/3 to 2/3 of the outer ring width of the bearing housing, preferably 1/2 to 2/ 3.
A washing machine deceleration clutch according to claim 11 or 12, wherein when the positioning mechanism is in contact with the outer ring surface of the bearing housing, the depth of the pawl deep into the tooth of the ratchet satisfies: 1 The tooth height of the /3 ratchet is ~3/4 ratchet.
A washing machine deceleration clutch according to claim 12, wherein said first pawl is fixedly disposed, said second pawl is rotatably disposed; and said pawl arm is provided with a second positioning a second positioning mechanism is disposed adjacent to the second pawl to define a positioning accuracy of the pawl; a side of the pawl arm adjacent to the bearing seat extends a reinforcing rib structure, and the reinforcing rib structure has a positioning surface near the second pawl .
A washing machine deceleration clutch according to any one of claims 1 to 20, characterized in that it comprises a brake band, the brake band comprises a belt body, and the belt body has a flat strip structure, and at least one end of the belt body is mounted on the system. The boom is characterized in that: one end of the belt body connected to the brake arm has a bent portion which is reversely bent, and a mounting hole is formed between the bent portion and the belt body, and the free end of the bent portion and the belt The body is welded into a unitary structure.
A washing machine deceleration clutch comprises a brake band, the brake band comprises a belt body, the belt body is a flat strip structure, and at least one end of the belt body is mounted on the brake arm, characterized in that the belt body and the brake arm One end of the connection has a bent portion which is reversely bent, and a mounting hole is formed between the bent portion and the belt body, and the free end of the bent portion is welded to the belt body to be integrally formed.
A washing machine deceleration clutch brake belt according to claim 22, wherein said bent portion and said belt body have at least three weld points.
A brake belt for a deceleration clutch of a washing machine according to claim 22, wherein the width of the belt at the mounting hole is narrowed, and the free end of the bent portion is the same as the width of the belt, and the bending is There are three solder joints between the part and the strip body, and the two solder joints are disposed at the same width of the bent portion and the strip body, and are symmetrically disposed on both sides of the center line of the strip body, and the other solder joint is set at the width of the strip body to be narrowed. At the office.
A brake belt for a deceleration clutch of a washing machine according to claim 22, wherein the two ends of the belt body are respectively mounted on the brake arm, and the two ends of the belt body respectively have a bent portion which is reversely bent. The bending portions at the two ends respectively form a mounting hole with the belt body, and the free ends of the bent portions at both ends are welded to the belt body to form an integral structure.
A washing machine deceleration clutch brake belt according to claim 25, wherein said belt body One end is a first bent portion corresponding to the first mounting hole; the other end is a second bent portion corresponding to the second mounting hole; the first mounting hole is mounted on the distal end of the brake arm, A bent portion has a length longer than the second bent portion.
A brake belt for a deceleration clutch of a washing machine according to claim 26, wherein said first bending portion and said belt body have a first welding point, a second welding point and a third welding point, a solder joint is disposed adjacent to the first mounting hole; the second bent portion and the strip body have a fourth solder joint, a fifth solder joint and a sixth solder joint, and the fourth solder joint is disposed adjacent to the second mounting hole; The distance between the first solder joint and the first mounting hole is equal to the distance between the fourth solder joint and the second mounting hole.
A brake belt for a deceleration clutch of a washing machine according to claim 26, wherein a distance between said second welding point and said third welding point is equal to a distance between said fifth welding point and said sixth welding point .
A brake belt for a deceleration clutch of a washing machine according to any one of claims 22-28, characterized in that the belt body is provided with a reinforcing rib, and the reinforcing rib is arranged along the center line of the belt body, and the length of the reinforcing rib Not less than 85% of the length of the strip.