CN107022879B

CN107022879B - Washing machine speed reduction clutch

Info

Publication number: CN107022879B
Application number: CN201610072409.3A
Authority: CN
Inventors: 缪立春; 任强军; 许益勇; 许�鹏; 章途隆; 黄厅厅; 陈荣誉
Original assignee: Zhejiang Sanxing Mechanical & Electronical Stock Co ltd
Current assignee: Zhejiang Sanxing Mechanical & Electronical Stock Co ltd
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2023-03-10
Anticipated expiration: 2036-02-01
Also published as: CN107022879A

Abstract

The invention provides a washing machine deceleration clutch, comprising a deceleration wheel train, a shell and a clutch mechanism; the clutch mechanism adopts a ratchet wheel and pawl clutch mode and comprises a ratchet wheel and a pawl arm, and the pawl arm is provided with a pawl which is used for being clamped with/separated from the ratchet wheel to realize washing/dehydration; the speed reducing gear train is arranged in the shell, and a bearing seat is arranged at one end of the shell, which is close to the upper ratchet wheel; the pawl arm is further provided with a positioning mechanism, the surface of the outer ring of the bearing seat is a positioning surface of the positioning mechanism, and the pawl arm can be limited to further move when the positioning mechanism is in contact with the surface of the outer ring of the bearing seat. The positioning mechanism of the pawl arm of the speed reduction clutch takes the outer ring surface of the bearing seat at the end part of the shell of the speed reduction gear train as the positioning surface, and the processing precision requirement of the bearing seat is higher, so that the design of the positioning mechanism is more convenient, the effective positioning of the pawl arm is ensured, and the deviation of the pawl on the pawl arm in the opening and resetting processes of the pawl arm is avoided, thereby ensuring the clutch effect of the clutch.

Description

Washing machine speed reduction clutch

Technical Field

The invention relates to the technical field of washing machines, in particular to a speed reduction clutch of a washing machine.

Background

The speed reducing clutch of washing machine is the main transmission part in automatic washing machine and has the functions of reducing the rotation speed of motor and increasing torque to realize the switching between washing and dewatering.

The pawl arm belongs to an important component in a clutch mechanism of a speed reduction clutch of the washing machine, in a washing state, the brake arm is in an initial state, a pawl on the pawl arm cuts into a ratchet wheel, a clutch holding spring is loosened, a motor drives an input shaft to reduce speed through a planetary gear train, and then an output shaft drives a wave wheel to rotate so as to carry out washing action; in a dehydration state, the pawl arm is separated from the ratchet wheel under the traction of the brake arm, the clutch holding spring holds the torque transmission shaft sleeve and the brake wheel cover tightly, so that the input shaft and the dehydration shaft are integrated, and the aim of centrifugal dehydration is achieved through high-speed unidirectional rotation.

Therefore, the position of the pawl arm directly influences the position of the pawl cutting into the ratchet wheel and the distance of the pawl separating from the ratchet wheel during dehydration. The existing pawl arm is usually positioned at the large outer circle of the lower shell, but the large outer circle of the lower shell is subjected to common stretching processing, and an opening of a brake band is large for assembly, so that the large outer circle is uneven in thickness and low in size precision, and when the pawl arm is positioned at the large outer circle of the lower shell, the deviation between a positioning surface and two pawls is too large, so that the pawl position is easy to deviate in the opening and resetting processes of the pawl arm, and the clutch cannot normally clutch.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

In order to solve the above problems, the present invention provides a decelerating clutch for a washing machine, specifically, the following technical solutions are adopted:

a washing machine deceleration clutch comprises a deceleration gear train, a shell and a clutch mechanism; the clutch mechanism adopts a ratchet wheel and pawl clutch mode and comprises a ratchet wheel and a pawl arm, and the pawl arm is provided with a pawl which is used for being clamped with/separated from the ratchet wheel to realize washing/dehydration; the speed reducing gear train is arranged in the shell, and a bearing seat is arranged at one end of the shell, which is close to the ratchet wheel; the pawl arm is further provided with a positioning mechanism, the surface of the outer ring of the bearing seat is a positioning surface of the positioning mechanism, and the pawl arm can be limited to further move when the positioning mechanism is in contact with the surface of the outer ring of the bearing seat.

Furthermore, the clutch mechanism comprises a clutch holding spring, an upper ratchet wheel, a lower ratchet wheel and a pawl arm, the upper ratchet wheel and the lower ratchet wheel are respectively sleeved at two ends of the clutch holding spring and are linked with the clutch holding spring, a first pawl and a second pawl are arranged on the pawl arm, the first pawl corresponds to the lower ratchet wheel, and the second pawl corresponds to the upper ratchet wheel; the first pawl is clamped with the lower ratchet wheel, when the second pawl is clamped with the upper ratchet wheel, the clutch holding spring is loosened to realize washing, the first pawl is separated from the lower ratchet wheel, and when the second pawl is separated from the upper ratchet wheel, the clutch holding spring is tightened to realize dehydration; the positioning mechanism is used for limiting the further movement of the pawl arm after the first pawl is clamped with the lower ratchet wheel and the second pawl is clamped with the upper ratchet wheel.

Furthermore, the pawl arm comprises a connecting part and an arm body, the connecting part is fixedly mounted on the rotating shaft and rotates along with the rotating shaft, a first pawl is arranged at the end part of the free end of the arm body, a second pawl is arranged in the middle of the arm body, and the positioning mechanism is arranged between the first pawl and the second pawl.

Furthermore, the positioning mechanism comprises a connecting arm and a positioning block, the connecting arm and the arm body of the pawl arm are integrally formed, the connecting arm is arranged on one side, close to the shell, of the arm body of the pawl arm, the positioning block is arranged at one end, extending towards the shell, of the connecting arm, and the positioning block protrudes out of the inner side surface of the connecting arm; the positioning block is provided with a positioning surface contacted with the surface of the outer ring of the bearing seat.

Furthermore, the connecting arm is formed by extending a protruding plane from the side wall of the inner side of the arm body of the pawl arm towards one side of the shell, the upper surface of the protruding plane is provided with a plurality of reinforcing ribs, and the reinforcing ribs are connected with the free end of the protruding plane and the side wall of the outer side of the arm body of the pawl arm.

Furthermore, the positioning mechanism further comprises an elastic cushion pad, and the elastic cushion pad is arranged on the positioning surface of the positioning block.

Further, the positioning block is provided with an arc surface which can be attached to the surface of the outer ring of the bearing seat, and preferably, the central angle corresponding to the arc surface of the positioning block is 20-40 degrees.

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

Further, when the positioning mechanism is contacted with the surface of the outer ring of the bearing seat, the depth of the pawl penetrating into the teeth of the ratchet wheel meets the following requirements: the tooth height of the 1/3 ratchet wheel is 3/4 ratchet wheel.

Furthermore, the first pawl is fixedly arranged, and the second pawl is rotatably arranged; the pawl arm is provided with a second positioning mechanism which is arranged close to the second pawl and used for limiting the rotation angle of the second pawl

And a reinforcing rib structure extends from one side of the pawl arm close to the bearing seat, and a positioning surface is arranged at the position of the reinforcing rib structure close to the second pawl.

According to the speed reduction clutch, the pawl arm is provided with the positioning mechanism, the positioning mechanism takes the outer ring surface of the bearing seat at the end part of the shell of the speed reduction gear train as the positioning surface, and the design of the positioning mechanism is more convenient under the condition of determining the parameters of the bearing seat due to higher requirement on the processing precision of the bearing seat, so that the pawl arm can be effectively positioned, and the pawl on the pawl arm is prevented from deviating in the opening and resetting processes of the pawl arm, and the clutch effect of the clutch is ensured.

Drawings

FIG. 1 is a schematic structural view of a deceleration clutch of a washing machine according to the present invention;

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

FIG. 3 is a front view of the ratchet arm of the present invention;

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

FIG. 5 is a rear view of the ratchet arm of the present invention;

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

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6 in accordance with the present invention;

FIG. 8 is a sectional view of the speed reduction clutch of the washing machine of the present invention;

FIG. 9 is an exploded view of a clutch mechanism of the washing machine of the present invention;

FIG. 10 is a schematic view showing the structure of a braking band of a decelerating clutch of a washing machine according to the present invention.

Reference numbers in the drawings indicate: 100-pulley 200-pawl arm 201-connecting arm 202-first pawl 203-second pawl 204-mounting shaft 205-positioning block 206-connecting part 207-arm 208-fixing hole 209-second positioning mechanism 210-positioning part 211-fixing nut 212-washer 213-return spring 300-housing 301-bearing seat 400-brake arm 401-first connecting shaft 402-second connecting shaft 500-rotating shaft 600-return mechanism 700-upper end cover 800-water seal 900-output shaft sleeve 1000-output shaft 1101-lower ratchet 1102-upper ratchet 1200-clutch holding spring 1300-torque transmission shaft sleeve 1400-input shaft 1500-brake wheel cover 1600-bearing 1700-brake wheel 1800-brake band 1801-band 1802-first bending 1803-first mounting hole 1804-reinforcing rib 1805-first welding point 1806-second welding point 1807-third welding point 1808-second bending point 1809-second mounting hole 1810-fifth welding point 1811-sixth welding point 1812-fourth welding point.

Detailed Description

The speed reducing clutch of the washing machine of the invention is described in detail with reference to the accompanying drawings:

as shown in fig. 1, a decelerating clutch of a washing machine includes a decelerating gear train, a housing 300 and a clutch mechanism; the clutch mechanism adopts a ratchet wheel and pawl clutch mode and comprises a ratchet wheel and a pawl arm 200, wherein the pawl arm 200 is provided with a pawl which is used for being engaged with/separated from the ratchet wheel to realize washing/dehydration; the speed reducing gear train is arranged in a shell 300, and a bearing seat 301 is arranged at one end, close to the ratchet wheel, of the shell 300; the pawl arm 200 is further provided with a positioning mechanism, the outer ring surface of the bearing seat 301 is a positioning surface of the positioning mechanism, and when the positioning mechanism is in contact with the outer ring surface of the bearing seat 301, the pawl arm 200 can be limited to further move.

According to the speed reduction clutch, the pawl arm 200 is provided with the positioning mechanism, the positioning mechanism takes the outer ring surface of the bearing seat 301 at the end part of the shell 300 of the speed reduction gear train as the positioning surface, and the bearing seat 301 is higher in machining precision requirement, so that the positioning mechanism is more convenient to design under the condition that the parameters of the bearing seat 301 are determined, the effective positioning of the pawl arm 200 is ensured, the deviation of a pawl on the pawl arm 200 in the opening and resetting processes of the pawl arm 200 is avoided, and the clutch effect of the clutch is ensured.

The positioning mode of the ratchet arm 200 of the invention is suitable for the existing washing machine speed reduction clutch adopting a ratchet-pawl clutch mode, including a ratchet-pawl type and a double-ratchet-pawl type. The present invention will be further described below by taking a double ratchet pawl type clutch mechanism as an example, but the present invention is not limited to this double ratchet pawl type clutch mechanism.

As shown in fig. 8, 9 and 2, the clutch mechanism includes a clutch holding 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 at two ends of the clutch holding spring 1200 and are linked with the same, the pawl arm 200 is provided with a first pawl 202 and a second pawl 203, 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 clamped with the lower ratchet 1101, when the second pawl 203 is clamped with the upper ratchet 1102, the clutch holding spring 1200 is loosened to realize washing, the first pawl 202 is separated from the lower ratchet 1101, and when the second pawl 203 is separated from the upper ratchet 1102, the clutch holding spring 1200 is tightened to realize dehydration; the positioning mechanism is used for limiting the further movement of the pawl arm 200 after the first pawl 202 is clamped with the lower ratchet 1101 and the second pawl 203 is clamped with the upper ratchet 1102.

According to the speed reduction clutch, a double-ratchet wheel and pawl clutch mode is adopted, after the first pawl 202 is clamped with the lower ratchet wheel 1101 and the second pawl 203 is clamped with the upper ratchet wheel 1102, the positioning mechanism is in contact with the outer ring surface of the bearing block 301, further movement of the pawl arm 200 is limited, on one hand, stability of clamping the first pawl 202 with the lower ratchet wheel 1101 and stability of clamping the second pawl 203 with the upper ratchet wheel 1102 can be guaranteed, and on the other hand, extrusion damage to ratchet teeth or pawls due to further movement of the pawl arm 200 can be avoided.

Therefore, as shown in fig. 3, 4 and 5, the pawl arm 200 includes a connecting portion 206 and an arm body 207, the connecting portion 206 is fixedly mounted on the rotating shaft 500 and rotates together with the rotating shaft, the free end of the arm body 207 is provided with the first pawl 202, the middle of the arm body is provided with the second pawl 203, and the positioning mechanism is arranged between the first pawl 202 and the second pawl 203.

The positioning mechanism is arranged between the first pawl 202 and the second pawl 203 and is determined by the position relation after the ratchet pawls are clamped, because after the first pawl 202 is clamped with the lower ratchet 1101 and the second pawl 203 is clamped with the upper ratchet 1102, the part between the first pawl 202 and the second pawl 203 on the pawl arm 200 and the two ratchets are in a concentric state, the distance between the part and the edge of the ratchet is shortest, and because the ratchet and the bearing seat 301 are coaxially arranged, the distance between the part between the first pawl 202 and the second pawl 203 on the pawl arm 200 and the bearing seat 301 is also shortest. Therefore, the positioning mechanism is arranged between the first pawl 202 and the second pawl 203, and is more easily contacted with the outer ring surface of the bearing seat 301, so that the positioning is realized.

The connecting portion 206 of the present invention has a fixing hole 208 for fixing the rotating shaft 500.

Specifically, the positioning mechanism comprises a connecting arm 201 and a positioning block 205, the connecting arm 201 is integrally formed with an arm body 207 of the pawl arm 200, the connecting arm 201 is arranged on one side, close to the shell 300, of the arm body 207 of the pawl arm 200, the positioning block 205 is arranged at one end, extending towards the shell 300, of the connecting arm 201, and the positioning block 205 is arranged to protrude out of the inner side surface of the connecting arm 201; the positioning block 205 has a positioning surface contacting with the outer ring surface of the bearing seat. The speed reduction clutch of the washing machine only protrudes to the shell 300 by the positioning mechanism, so that the speed reduction clutch is in contact positioning with the bearing seat 301, the material of the pawl arm 200 can be saved, and the cost is reduced.

Further, the connecting arm 201 is formed by extending a protruding plane from the inner side wall of the arm body of the ratchet arm 200 toward one side of the housing, and a plurality of reinforcing ribs are arranged on the upper surface of the protruding plane and connect the free end of the protruding plane and the outer side wall of the arm body of the ratchet arm. Therefore, on the basis of ensuring the integral strength of the positioning mechanism, the material is reduced, and the manufacturing cost is reduced.

Furthermore, the positioning mechanism further comprises an elastic cushion pad, and the elastic cushion pad is arranged on the positioning surface of the positioning block. Because the positioning mechanism is when fixing a position, the locating piece has certain speed impact on the outer lane surface of bearing frame usually, therefore, at the instant of location contact, receive the reverse impulsive force on the outer lane surface of bearing frame great, very easily lead to the locating piece to break. According to the invention, the elastic cushion pad can effectively reduce the impact force on the surface of the outer ring of the bearing seat when the positioning mechanism is positioned, and the fracture between the positioning block and the connecting arm is avoided, so that the positioning effectiveness is ensured, and the service life of the positioning mechanism is prolonged.

Further, the positioning block 205 has an arc surface, and the arc surface can be attached to the outer ring surface of the bearing seat 301. Therefore, the tightness of the fit between the positioning block 205 of the positioning mechanism and the outer ring surface of the bearing seat 301 can be ensured, and the positioning stability can be ensured.

Furthermore, the central angle corresponding to the arc surface of the positioning block 205 is 20 to 40 degrees, so that the area of the positioning surface of the positioning block 205 is ensured, and the positioning stability is ensured.

Still further, the width of the positioning block 205 is 1/3 to 2/3, preferably 1/2 to 2/3, of the width of the outer ring of the bearing seat 301, so as to further ensure the size of the positioning surface area of the positioning block 205 and ensure the positioning stability.

In a preferred embodiment of the present invention, when the positioning mechanism contacts with the outer ring surface of the bearing seat 301, the depth of the pawl penetrating into the teeth of the ratchet wheel is as follows: the tooth height of the 1/3 ratchet wheel is 3/4 ratchet wheel. Therefore, on one hand, the tooth depth at least 1/3 of the ratchet wheel can ensure the effectiveness and stability of clamping, on the other hand, the tooth depth less than 3/4 of the ratchet wheel can ensure the smooth separation of the pawl and the ratchet wheel, and simultaneously, the serious damage of the tooth due to extrusion between the pawl and the ratchet wheel is avoided, and the service life is ensured.

As shown in fig. 6, the first pawl 202 of the present invention is fixedly disposed, and the second pawl 203 is rotatably disposed; the pawl arm 200 is provided with a second positioning mechanism 209, and the second positioning mechanism 209 is arranged near the second pawl 203 and used for limiting the rotation angle of the second pawl. The second detent mechanism 209 limits the second pawl 203 to rotate in only one direction, ensuring overall stability of the clutch mechanism. Correspondingly, the second pawl 203 is provided with a positioning part 210 which is matched with the second positioning mechanism 209.

As shown in fig. 7, the second pawl 203 is rotatably mounted on a mounting shaft 204, one end of the mounting shaft 204 is fixed to the arm 207, and the other end of the mounting shaft 204 is mounted with a fixing nut 211 to limit the axial movement of the second pawl 203. The mounting shaft 204 or the pawl arm 200 is sleeved with a return spring 213, one end of the return spring 213 is abutted against the arm 207, and the other end of the return spring is abutted against the second pawl 203, so that the second pawl 203 is reset to ensure normal clamping.

Specifically, a reinforcing rib structure extends from one side of the pawl arm 200 close to the bearing seat 301, and a positioning surface is arranged on the reinforcing rib structure close to the second pawl 203.

The pawl arm 200 is positioned on the outer ring surface of the bearing seat 301 of the shell 300, the bearing seat 301 is processed by precision stretching, the excircle dimensional precision is higher, and the positioning surface is arranged at the middle position of the two pawls, so that the effective positioning of the pawl arm 200 can be well ensured, the two pawls on the pawl arm 200 are prevented from shifting in the opening and resetting processes of the pawl arm 200, and the clutch effect of the clutch is ensured.

Example one

As shown in fig. 3, the positioning surface of the positioning mechanism of the ratchet arm 200 of the present embodiment has a height L1 of 13mm from the bottom plane of the fixing hole 208 of the ratchet arm 200. As shown in fig. 4, the positioning surface of the positioning mechanism of the pawl arm 200 is an arc surface centered at a position 57mm below the center line H1 of the fixing hole 208 of the pawl arm 200, the arc radius R1 is 20.8mm, the included angle α between both sides is 27.6 °, and is symmetrical around the perpendicular line at a position 57mm below the center line H1 of the fixing hole 208 of the pawl arm 200, the linear distance H2 between both sides is 11.4mm, and the thickness L2 is 5mm.

Example two

A washing machine clutch control method comprises a clutch mechanism, wherein the clutch mechanism comprises a clutch holding spring, an upper ratchet wheel, a lower ratchet wheel, a first pawl and a second pawl, the rotation direction of the lower ratchet wheel is the same as that of the clutch holding spring after installation, the rotation direction of the upper ratchet wheel is opposite to that of the clutch holding spring after installation, the first pawl is clamped with the lower ratchet wheel, the clutch holding spring is loosened when the second pawl is clamped with the upper ratchet wheel, washing is realized, the first pawl is separated from the lower ratchet wheel, and the clutch holding spring is tightened when the second pawl is separated from the upper ratchet wheel, so that dehydration is realized; the clutch control method comprises the following steps:

the washing machine executes a washing/rinsing program, and controls the first pawl to be engaged with the lower ratchet wheel before the second pawl is engaged with the upper ratchet wheel.

The method for controlling the clutch of the washing machine controls the first pawl to be engaged with the lower ratchet wheel before the second pawl is engaged with the upper ratchet wheel during washing/rinsing, so that the first pawl and the lower ratchet wheel are combined firstly, the lower ratchet wheel is installed and then has the same rotating direction with the clutch holding spring, at the moment, the clutch holding spring is partially opened when the lower ratchet wheel rotates, and at the moment, if the motor is started, washing/rinsing can be realized without damaging the clutch.

Furthermore, the washing machine executes a washing/rinsing program, and when the depth of the first pawl entering the teeth of the lower ratchet wheel exceeds 1/5 of the tooth depth, the second pawl and the upper ratchet wheel start to be clamped. Preferably, when the depth of the first pawl entering the teeth of the lower ratchet wheel exceeds 1/3 of the depth of the teeth, the second pawl and the upper ratchet wheel start to be clamped. Therefore, the first pawl can be guaranteed to complete clamping before the second pawl, when the first pawl completes clamping, washing/rinsing can be achieved even if the motor is started, and the clutch machine cannot be damaged.

The washing machine clutch control method of the embodiment further comprises the following steps: the washing machine executes a dehydration program, and controls the second pawl to start to separate from the upper ratchet wheel before the first pawl starts to separate from the lower ratchet wheel.

In a similar way, the second pawl and the upper ratchet wheel are separated firstly, the clutch holding spring is still in an opening state, at the moment, if the motor is started, the lower ratchet wheel cannot rotate along with the rotating shaft, even if the first pawl is not separated from the lower ratchet wheel, the tooth punching phenomenon cannot occur, and the clutch machine cannot be damaged.

Further, the washing machine performs a dehydration process, and when the second pawl is more than 0.5mm away from the top of the upper ratchet wheel, the first pawl starts to separate from the lower ratchet wheel. Therefore, the second pawl can be guaranteed to be separated before the first pawl, and after the second pawl is separated, even if the first pawl is not separated completely, if the motor is started, the clutch machine cannot be damaged.

Therefore, the clutch control method of the washing machine of the embodiment combines the working process of the washing machine and the action relation of the clutch mechanism, so that the clutch mechanism is more stable.

As shown in fig. 8 and 9, the present embodiment also provides a decelerating clutch for a washing machine, the clutch mechanism includes a clutch holding 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 at two ends of the clutch holding spring 1200 and are linked therewith, the pawl arm 200 is provided with a first pawl 202 and a second pawl 203, 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 clamped with the lower ratchet 1101, when the second pawl 203 is clamped with the upper ratchet 1102, the clutch holding spring 1200 is loosened to realize washing, the first pawl 202 is separated from the lower ratchet 1101, and when the second pawl 203 is separated from the upper ratchet 1102, the clutch holding spring 1200 is tightened to realize dehydration; the relative angle between the first pawl 202 and the second pawl 203 satisfies: the washing machine executes a washing/rinsing program, and the first pawl 202 and the lower ratchet wheel 1101 start to be clamped before the second pawl 203 and the upper ratchet wheel 1102 start to be clamped; the washing machine performs a spin-drying process in which the second pawl 203 starts to disengage from the upper ratchet 1102 before the first pawl 202 starts to disengage from the lower ratchet 1101.

The decelerating clutch of the washing machine of the embodiment, by setting the first pawls 202 and the second pawls 203 at appropriate angles, makes: during washing/rinsing, the first pawl 202 and the lower ratchet 1101 are controlled to be engaged before the second pawl 203 and the upper ratchet 1102 are controlled to be engaged, so that the first pawl 202 and the lower ratchet 1101 are combined firstly, the lower ratchet 1101 is installed and then is the same as the rotating direction of the clutch holding spring 1200, at the moment, the clutch holding spring 1200 is partially opened when the lower ratchet 1101 rotates, and at the moment, if the motor is started, washing/rinsing can be realized without damaging the clutch; similarly, when dewatering, the second pawl 203 is separated from the upper ratchet 1102 first, the clutch holding spring is still in an open state, and at the moment, if the motor is started, the clutch machine cannot be damaged.

In order to realize the sequential engagement of the first pawl 202 and the second pawl 203 on the pawl arm 200, the first pawl 202 has a first acting surface which abuts against the lower ratchet 1101 when engaged, and the second pawl 203 has a second acting surface which abuts against the upper ratchet 1102 when engaged; the included angle between the first acting surface and the second acting surface is 135-165 degrees.

As shown in fig. 3, 4 and 5, the pawl arm 200 includes a connecting portion 206 and an arm body 207, the connecting portion 206 is fixedly mounted on the rotating shaft 500 and rotates together with the rotating shaft, a first pawl 202 is disposed at a free end of the arm body 207, and a second pawl 203 is disposed at a middle of the arm body. The connecting portion 206 of the present invention has a fixing hole 208 for fixing the rotating shaft 500.

As a preferred embodiment of this embodiment, the first pawl 202 is fixedly disposed on the arm 200, and the second pawl 203 is of a resilient structure or is movable relative to the arm.

In order to ensure the molding effect of the mold and control the depth of the pawl cut into the ratchet wheel, the elastic claw and the fixed claw are designed to be matched. The two pawls are ensured to cut into 1/3-3/4, preferably 1/2-3/4, of the ratchet wheel in the initial state, and when the traction motor opens the brake arm 400 in the dehydration state, the two pawls need to disengage the ratchet wheel, and when the brake arm 400 opens the rated stroke, the distance between the pawls and the ratchet wheel needs to be disengaged is more than or equal to 1.5mm, preferably more than or equal to 2mm.

The first pawl 202 of the embodiment is fixedly arranged, and the second pawl 203 is rotatably arranged; the pawl arm 200 is provided with a second positioning mechanism, and the second positioning mechanism is arranged close to the second pawl 203 and used for limiting the rotation angle of the second pawl. The second positioning mechanism limits the second pawl 203 to rotate only in one direction, ensuring the overall stability of the clutch mechanism.

The second pawl 203 is rotatably installed on the installation shaft 204, the installation shaft 204 and the arm body 207 are integrally formed, the installation 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 of the return spring is abutted against the second pawl 203, so that the second pawl 203 is reset to ensure normal clamping.

As shown in fig. 1, 2, 8 and 9, in the washing state, the brake arm 400 is in the initial state, the first pawl 202 on the pawl arm 200 is engaged with the lower ratchet 1101, the second pawl 203 is engaged with the upper ratchet 1102, the clutch spring 1200 is pushed to release the brake wheel cover 1500 and the torque transmission shaft sleeve 1300, the motor drives the input shaft 1400 to rotate the output shaft 1000 through the speed reduction of the speed reduction gear train, so as to realize the washing/rinsing effect; in the dehydration state, the traction motor pulls the brake arm 400 open, the pawl arm 200 is opened correspondingly, the second pawl 203 is separated from the upper ratchet wheel 1102, the first pawl 202 is separated from the lower ratchet wheel 1101, the clutch holding spring 1200 holds the brake wheel cover 1500 and the torque transmission shaft sleeve 1300 tightly, and meanwhile, the brake belt 1800 releases the brake wheel 1700, so that the output shaft 1000 and the output shaft sleeve 900 are integrated into a whole to realize dehydration in high-speed unidirectional rotation.

EXAMPLE III

As shown in fig. 10, the brake band of the decelerating clutch of the washing machine comprises a band body 1801, wherein the band body 1801 is a flat strip structure, at least one end of the band body 1801 is installed on the brake arm 400, one end of the band body 1801 connected with the brake arm 400 is provided with a bending part which is bent reversely, a mounting hole is formed between the bending part and the band body, and a free end of the bending part and the band body are welded into an integral structure.

In the braking band of the decelerating clutch of the washing machine, the connection end of the band body 1801 and the braking arm 400 is changed from the existing riveting mode to welding, the arrangement of riveting holes does not need to be considered, the connection length of the end part of the band body 1801 can be shortened to a certain extent, the length of the reinforcing rib 1804 on the band body can be lengthened, the bending deformation is avoided when the braking band is subjected to roll forming, and the tension of the braking band is ensured when the braking arm 400 opens the braking band to be disengaged from the braking wheel.

When the riveting mode is adopted, the connection tightness can be ensured only if the opening position and the size of the riveting hole have certain requirements, so that the connection length is relatively large when the riveting mode is adopted. This embodiment changes it into the welding, through with kink and area body 1801 heating, the hot welding pressfitting makes it connect as an organic wholely, has avoided the riveting hole, and connection length is shorter.

In addition, the welding mode is simpler and is easier to realize.

Further, at least three welding points are arranged between the bending part and the belt body 1801. On one hand, the connection strength can be ensured, and on the other hand, the process difficulty can be reduced.

The width of the belt body at the mounting hole is narrowed, the free end of the bending part is the same as the width of the belt body, three welding spots are arranged between the bending part and the belt body, the two welding spots are arranged at the same positions of the bending part and the width of the belt body and are symmetrically arranged at two sides of the central line of the belt body, and the other welding spot is arranged at the narrowed position of the width of the belt body. The purpose of narrowing the strap 1801 at the mounting hole is to mount the brake strap on the brake arm 400, thereby saving the mounting space.

The brake band of this embodiment is applicable to a deceleration clutch of a washing machine having one end fixed to housing 300 and the other end connected to brake arm 400, and also applicable to a deceleration clutch of a washing machine having both ends connected to brake arm 400, respectively.

As shown in fig. 8, 9 and 10, the braking belt of the speed reduction clutch for the washing machine is suitable for the speed reduction clutch of the washing machine with two ends respectively connected to the braking arm 400, two ends of the belt body 1801 are respectively installed on the braking arm 400, two ends of the belt body are respectively provided with a bending part which is bent reversely, mounting holes are respectively formed between the bending parts of the two ends and the belt body, and a free end of the bending part of the two ends and the belt body are welded into an integral structure.

Further, one end of the tape body is a first bending portion 1802, and is correspondingly provided with a first mounting hole 1803; the other end is a second bending part 1808, which is correspondingly provided with a second mounting hole 1809; the first mounting hole 1803 is mounted at the distal end of the brake arm 400, and the length of the first bent portion 1802 is longer than that of the second bent portion 1808. The present embodiment sets the length of the first bend 1802 and the length of the second bend 1808 different according to the structural characteristics of the brake band mounted on the brake arm 400 for easy connection. Further, since the first mounting hole 1803 is mounted at the distal end of the brake arm 400, the first bent portion 1802 has a length longer than that of the second bent portion 1808.

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

Specifically, a first welding point 1805, a second welding point 1806, and a third welding point 1807 are disposed between the first bending portion 1802 and the tape body 1801, and the first welding point 1805 is disposed near the first mounting hole 1803; a fourth welding point 1812, a fifth welding point 1810 and a sixth welding point 1811 are arranged between the second bending part 1808 and the tape body 1801, and the fourth welding point 1812 is arranged close to the second mounting hole 1809; the distance between the first welding point 1805 and the first mounting hole 1803 is equal to the distance between the fourth welding point 1812 and the second mounting hole 1809. Thus, the connection fastening degree near the installation hole is ensured.

Further, the distance between the second welding point 1806 and the third welding point 1807 is equal to the distance between the fifth welding point 1810 and the sixth welding point 1811. Thus, the connection fastening degree of the end of the bent part is ensured.

Specifically, the diameter of the welding point between the bending part and the belt body is not less than 4mm. Thus, the strength of the welding is ensured.

As a preferred embodiment of this embodiment, the belt body is provided with a reinforcing rib 1804, the reinforcing rib 1804 is disposed along the central 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 embodiment adopts a welding mode, so that the length of the joint is shortened, the length of the reinforcing ribs 1804 can be lengthened as much as possible, bending deformation is avoided when the brake band is subjected to roll forming, and the tension of the brake band is ensured when the brake arm 400 is opened and the brake band is separated from the brake wheel.

The brake band of the embodiment is welded, compared with riveting connection, the space is saved, the length of the reinforcing rib 1804 of the brake band can be correspondingly lengthened, so that the rigidity of the brake band is guaranteed, bending deformation is avoided when the brake band is subjected to roll forming, and the tension of the brake band is guaranteed when the brake arm is opened and the brake band is separated from the brake wheel.

The embodiment also provides a washing machine speed reduction clutch with the speed reduction clutch brake belt.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A washing machine deceleration clutch comprises a deceleration wheel train, a shell and a clutch mechanism; the clutch mechanism adopts a ratchet wheel and pawl clutch mode and comprises a ratchet wheel and a pawl arm, and the pawl arm is provided with a pawl which is used for being clamped with/separated from the ratchet wheel to realize washing/dehydration; the speed reducing wheel train is arranged in the shell, and a bearing seat is arranged at one end of the shell, which is close to the ratchet wheel; the positioning mechanism is characterized in that the pawl arm is further provided with a positioning mechanism, the surface of the outer ring of the bearing seat is a positioning surface of the positioning mechanism, and the pawl arm can be limited to further move when the positioning mechanism is in contact with the surface of the outer ring of the bearing seat.

2. The decelerating clutch of the washing machine as claimed in claim 1, wherein the clutch mechanism comprises a clutch holding spring, an upper ratchet wheel, a lower ratchet wheel and a pawl arm, the upper ratchet wheel and the lower ratchet wheel are respectively sleeved at two ends of the clutch holding spring and are linked with the clutch holding spring, the pawl arm is provided with a first pawl and a second pawl, the first pawl corresponds to the lower ratchet wheel, and the second pawl corresponds to the upper ratchet wheel; the first pawl is clamped with the lower ratchet wheel, when the second pawl is clamped with the upper ratchet wheel, the clutch holding spring is loosened to realize washing, the first pawl is separated from the lower ratchet wheel, and when the second pawl is separated from the upper ratchet wheel, the clutch holding spring is tightened to realize dehydration; the positioning mechanism is used for limiting the further movement of the pawl arm after the first pawl is clamped with the lower ratchet wheel and the second pawl is clamped with the upper ratchet wheel.

3. A decelerating clutch for a washing machine according to claim 1 or 2, wherein the pawl arm comprises a connecting portion and an arm body, the connecting portion is fixedly mounted on the shaft and rotates therewith, a first pawl is arranged at the end of the free end of the arm body, a second pawl is arranged at the middle of the arm body, and the positioning means is arranged between the first pawl and the second pawl.

4. The decelerating clutch for the washing machine as claimed in claim 3, wherein the positioning mechanism comprises a connecting arm and a positioning block, the connecting arm is integrally formed with the arm body of the ratchet arm, the connecting arm is disposed on one side of the arm body of the ratchet arm close to the housing, the positioning block is disposed on one end of the connecting arm extending towards the housing, and the positioning block is protruded out of the inner side surface of the connecting arm; the positioning block is provided with a positioning surface contacted with the surface of the outer ring of the bearing seat.

5. The decelerating clutch for washing machine as claimed in claim 4, wherein the connecting arm is formed by a protruding plane extending from the inner side wall of the body of the ratchet arm toward the housing, and a plurality of ribs are provided on the upper surface of the protruding plane, the ribs connecting the free end of the protruding plane and the outer side wall of the body of the ratchet arm.

6. The decelerating clutch for washing machine as claimed in claim 4, wherein the positioning mechanism further comprises a resilient cushion disposed on the positioning surface of the positioning block.

7. The decelerating clutch for washing machine as claimed in claim 4, wherein the positioning block has a circular arc surface, and the circular arc surface can be engaged with the outer ring surface of the bearing seat.

8. The decelerating clutch for washing machine according to claim 7, wherein a central angle corresponding to the arc surface of the positioning block is 20 ° to 40 °.

9. The decelerating clutch for washing machine as claimed in claim 4, wherein the width of the positioning block is 1/3-2/3 of the width of the outer ring of the bearing seat.

10. The decelerating clutch for washing machine as claimed in claim 9, wherein the width of the positioning block is 1/2-2/3 of the width of the outer ring of the bearing seat.

11. A decelerating clutch for washing machine according to claim 1 or 2, wherein when the positioning means is in contact with the outer race surface of the bearing housing, the depth of the pawl penetrating into the teeth of the ratchet wheel is such that: the tooth height of the 1/3 ratchet wheel is 3/4 ratchet wheel.

12. The decelerating clutch for a washing machine as claimed in claim 2, wherein the first pawl is fixedly arranged and the second pawl is rotatably arranged; the pawl arm is provided with a second positioning mechanism which is arranged close to the second pawl and used for limiting the rotation angle of the second pawl; a reinforcing rib structure extends from one side of the pawl arm close to the bearing seat, and a positioning surface is arranged at the position, close to the second pawl, of the reinforcing rib structure.