JP3193462U - Sealing device for washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device for a washing machine capable of improving durability. A washing machine sealing device 1 includes a main body 2 made of an annular elastic body and a reinforcing ring 3 made of an annular metal. The main body includes a gasket portion 4 that is internally fitted into the opening of the casing 72, and a seal portion 5 that is slidably close to the outer surface of the shaft 71 that is inserted into the main body. The seal portion includes a first lip portion 51, a second lip portion 52, a protrusion 53, and a dust strip 57. The dust strip is an extension piece extending in the axial direction x direction from the end portion of the first lip portion on the motor side in the seal portion. With this dust strip, foreign matter can enter the seal portion from the motor side, and it is possible to suppress the occurrence of wear of the lip portion due to the foreign matter. Further, since the annular protrusion 53 is provided, the grease 7 can be stably provided to the first lip portion. [Selection diagram] Fig. 2

Description

  The present invention relates to a sealing device, and more particularly, to a sealing device for a washing machine used in a washing machine.

  Conventionally, in a washing machine, a sealing device has been used to seal a gap between a casing and a shaft that rotates a washing tub. FIG. 3 is a cross-sectional view showing the structure of this type of conventional sealing device.

  As shown in FIG. 3, a conventional washing machine sealing device 100 is provided in this gap to seal the gap between the shaft 101 driven by the motor and the casing 103 of the washing tub 102. . Specifically, in a conventional washing machine, the shaft 101 is rotatably supported by a bearing 105 supported by a housing 104 of the washing machine, and extends into the casing 103 through an opening 106 of the casing 103. ing. The washing tub 102 is rotatably provided inside the casing 103 and is fixed to the shaft 101 so as not to be relatively rotatable. The washing machine sealing device 100 is an annular member centering on an axis, and includes an annular gasket portion 110 on the outer peripheral side and a seal portion 120 on the inner peripheral side, as shown in FIG. The gasket portion 110 is fitted in the opening 106 of the casing 102, and the washing machine sealing device 100 is fitted and fixed in the housing 104.

  The seal part 120 is made of an elastic body such as a rubber material, and includes a first lip part 121 and a second lip part 122 provided above the first lip part 121. The 1st lip part 121 is an annular protrusion body centering on an axis, and as shown in Drawing 3, the section which meets the axis shows a wedge shape. The first lip 121 is in liquid-tight contact with the surface of the shaft 101 at the inner peripheral tip. An annular spring 123 is provided at a position facing the first lip portion 121 in the seal portion 120, and the first lip portion 121 is pressed against the shaft 101 by the spring 123. Similarly, the second lip portion 122 is an annular extending piece centered on the axis, and extends obliquely upward and inward, and is in liquid-tight contact with the surface of the shaft 101 at the tip. ing.

  Further, the seal portion 120 has a protrusion 124 as a grease lip between the first lip portion 121 and the second lip portion 122 and in the vicinity of the first lip portion 121. The projecting portion 124 is an annular portion centering on the axis, and extends obliquely upward and inward, forming a first lip portion 121 and a space 107. The space 107 is filled with grease, and this grease lubricates the contact portion between the shaft 101 and the first lip portion 121.

  For example, in an oil seal or the like used in an automobile, a spring and a first lip portion are disposed on the oil side (liquid side). However, in a sealing device for a washing machine, as described above, it is opposite to the oil seal. In addition, the first lip portion 121 and the spring 123 are provided on the atmosphere side. This is to prevent the laundry from being contaminated by the grease that lubricates the first lip 121 being mixed into the washing water.

  However, in the conventional sealing machine 100 for a washing machine, the first lip portion 121 is exposed to the atmosphere side, that is, the motor side, and foreign matters such as dust adhere to the first lip portion 121 from the motor side. It was. For this reason, foreign matter enters the contact portion between the first lip portion 121 and the shaft 101, the wear of the first lip portion 121 is accelerated by the foreign matter, and the durability of the first lip portion 121 is lowered. It was a problem.

  In order to solve the above problems, an object of the present invention is to provide a washing machine sealing device capable of improving durability.

  In order to achieve the above object, a sealing device for a washing machine according to the present invention is for sealing between a shaft that transmits the power of a motor to rotate the washing tub and a casing that houses the washing tub. A sealing device for a washing machine, comprising an annular main body centered on an axis, wherein the main body is attached to the casing, and is slid on an outer surface of the shaft. A seal portion that is in close contact with the motor, and the seal portion includes an annular dust strip centered on the axis at the end of the motor.

  In the sealing device for a washing machine according to the present invention, the dust lip is an extending piece extending toward the axis.

  In the sealing device for a washing machine according to the present invention, the dust lip is an extended piece extending toward the motor.

  In the sealing device for a washing machine according to the present invention, the seal portion is slidably in close contact with the outer surface of the shaft, and has an annular first lip portion centered on the axis, and the first lip portion. In addition, in order to form a space in which the grease is filled and held, an annular projecting portion centered on the axis provided on the washing tub side with respect to the first lip portion is provided.

  In the sealing device for a washing machine according to the present invention, the first lip portion has a protruding ridge body that protrudes toward the axis, and the cross-sectional shape of the ridge body along the axis is a wedge shape. It is.

  In the sealing device for a washing machine according to the present invention, the seal portion is an annular shape centering on the axis that is slidably in close contact with the outer surface of the shaft on the washing tub side with respect to the protrusion. A second lip portion is provided.

  In the sealing device for a washing machine according to the present invention, the second lip portion is an extending piece extending toward the washing tub.

  According to the sealing device for a washing machine according to the present invention, the seal portion includes the annular dust lip centered on the axis at the end portion on the motor side, so that foreign matter enters the seal portion from the motor side by the dust lip. Can be suppressed. For this reason, generation | occurrence | production of the abrasion of the lip | rip part by a foreign material can be suppressed, and durability of this sealing device can be improved.

  According to the washing machine sealing device according to the present invention, since the dust lip is an extending piece extending toward the axis, foreign substances can be effectively prevented from entering the seal portion from the motor side.

  According to the washing machine sealing device according to the present invention, the dust lip is an extended piece extending toward the axis and toward the motor side, so that it is more effective that foreign matter enters the seal portion from the motor side. Can be suppressed.

  According to the washing machine sealing device of the present invention, the seal portion includes the annular first lip portion and the annular protrusion for filling and holding the grease together with the first lip portion. Can be stably provided to the first lip portion. For this reason, it can lubricate between a 1st lip | rip part and a shaft, and can improve the durability of this sealing device.

  According to the sealing device for a washing machine according to the present invention, the first lip portion has a protruding ridge body that protrudes toward the axis, and the cross-sectional shape of the ridge body is a wedge shape. And the shaft can be effectively sealed.

  According to the sealing device for a washing machine according to the present invention, the seal portion includes the annular second lip portion on the side of the washing tub with respect to the projection portion, so that the seal portion and the shaft are more reliably sealed. can do.

  According to the sealing device for a washing machine according to the present invention, since the second lip portion is an extended piece extending toward the washing tub side, the followability of the second lip portion to the shaft is improved. Can do.

It is sectional drawing in the cross section along the axis line of the sealing device which shows schematic structure of the sealing device for washing machines which concerns on embodiment of this invention. It is a fragmentary sectional view for showing the state where the sealing device for washing machines was assembled in the washing machine. It is sectional drawing for showing the structure of the conventional sealing device for washing machines.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view taken along the axis of the sealing device, showing a schematic configuration of the sealing device for a washing machine according to the embodiment of the present invention.

  As shown in FIG. 1, a washing machine sealing device 1 according to an embodiment of the present invention (hereinafter also simply referred to as a sealing device) includes a main body 2 made of an annular elastic body centered on an axis x, an axis and a reinforcing ring 3 made of an annular metal centering on x. Examples of the elastic body of the main body 2 include various rubber materials such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), and synthetic rubber such as silicone rubber. Examples of the metal of the reinforcing ring 3 include stainless steel and SPCC (cold rolled steel).

  The main body 2 includes a gasket portion 4 that is fitted in an opening of a casing (not shown), and a seal portion 5 that is slidably in close contact with an outer surface of a shaft (not shown) that is inserted through the main body 2.

  The gasket portion 4 is a cylindrical annular portion centering on the axis line x on the outer peripheral side in the main body 2. An outer peripheral surface 41 which is a peripheral surface on the outer peripheral side of the gasket portion 4 is defined based on a fastening margin portion 42 having a thickness (a radial dimension) corresponding to a dimension of an opening of a casing (not shown). As will be described later, when the outer peripheral surface 41 of the gasket portion 4 is in close contact with the inner peripheral surface of the opening of the casing, the space between the sealing device 1 and the casing is sealed. Here, for convenience of explanation, in the direction perpendicular to the axis x, the direction away from the axis x (the direction of arrow a in FIG. 1) is the outer peripheral side, and the direction approaching the axis x (the direction of arrow b in FIG. 1) is the inner peripheral side. And Further, as will be described later, in FIG. 1, the upper side is the washing tub side, and the lower side is the motor side.

  The seal part 5 is a cylindrical annular part centering on the axis line x on the inner peripheral side in the main body 2, and as shown in FIG. 1, a first lip part 51 and a second lip part 52. And a protrusion 53.

  As shown in FIG. 1, the first lip 51 has a wedge shape that is convex in the inner circumferential direction in a cross section including the axis x (hereinafter also simply referred to as a cross section), and is annular with the axis x as the center. It is a ridge. The first lip 51 is provided at the end of the seal 5 on the motor side. As will be described later, a lip tip portion 54 which is a tip portion on the inner peripheral side of the first lip portion 51 is brought into contact with the shaft, and the space between the first lip 51 and the shaft is sealed.

  The second lip portion 52 is an annular portion centered on the axis line x, and is an extended piece extending from the end portion of the seal portion 5 on the washing tub side toward the inner peripheral side and the washing tub side. . Specifically, the second lip portion 52 is a conical cylindrical portion extending from the end portion of the seal portion 5 on the washing tub side, the diameter of which is gradually reduced toward the washing tub side. As will be described later, in the assembled state, the tip portion of the second lip portion 52 abuts on the shaft, and the space between the second lip 52 and the shaft is sealed. Moreover, since the 2nd lip | rip part 52 is an extended piece, the followable | trackability to a shaft can be made high.

  The protruding portion 53 is an annular portion that is provided between the first lip portion 51 and the second lip portion 52 with the axis line x as the center, and is on the inner peripheral side and the second lip portion 52 side. It is the extended piece extended in the direction. Specifically, the protrusion 53 has a conical cylindrical shape extending gradually from the first lip portion 51 and the second lip portion 52 toward the second lip portion 52 side in the seal portion 5. Part. Further, as will be described later, in the assembled state, the tip portion of the protrusion 53 abuts on the shaft.

  As described above, an annular space 55 is formed between the first lip 51 and the protrusion 53. As will be described later, the annular space 55 is filled with grease in the assembled state.

  In the seal portion 5, an annular recess 56 is formed on the inner peripheral side surface facing the first lip portion 51, and the annular spring 6 is accommodated in the recess 56, and the first lip portion 51 is urged in the inner circumferential direction.

  Further, the seal portion 5 includes a dust lip 57. The dust lip 57 is an extended piece that extends from the end of the first lip 51 on the motor side toward the axis x direction in the seal portion 5. For example, the dust lip 57 is a conical cylinder-shaped portion in the seal portion 5 that extends by being gradually reduced in diameter from the end of the first lip portion 51 on the motor side toward the motor side. As will be described later, in the assembled state, the tip portion of the dust lip 57 is set in shape and size so as to contact the shaft, but the dust lip 57 does not contact the shaft. It may be.

  The reinforcing ring 3 is covered with the main body 2 and integrated with the main body 2 to reinforce the main body 2. The cross section of the reinforcing ring 3 is substantially L-shaped, and has a cross-sectional shape corresponding to the cross-sectional shape of the main body 2. Specifically, the cross-sectional shape of the reinforcing ring 3 corresponds to the cross-sectional shape of the gasket portion 4 and reinforces the gasket portion 4 and the connection portion between the gasket portion 4 and the seal portion 5. The reinforcing ring 3 may be partially covered by the main body 2 or entirely covered by the main body 2 as long as the main body 2 can be reinforced.

  The reinforcing ring 3 is manufactured by, for example, pressing or forging, and the main body 2 is formed by vulcanization molding using a molding die. At the time of this vulcanization molding, the reinforcing ring 3 is disposed in the mold, and the reinforcing ring 3 and the main body 2 are integrally molded.

  Next, the assembled state of the washing machine sealing device 1 having the above-described configuration assembled to the washing machine will be described. FIG. 2 is a partial cross-sectional view schematically showing a state in which the washing machine sealing device 1 is assembled to the washing machine.

  As shown in FIG. 2, the sealing machine 1 for a washing machine has a gap between a shaft 71 driven by a motor of a washing machine (not shown) and a casing 72 of a washing tub (not shown). Is provided. The shaft 71 is rotatably supported in the washing machine via a bearing or the like (not shown), and extends into the casing 72 through an opening 73 of the casing 72.

  In the sealing device 1, the gasket portion 4 is fixed to the casing 72 by being fitted into the opening 73 of the casing 72. The tightening margin 42 of the gasket portion 4 is compressed, the outer peripheral surface 41 is in close contact with the inner peripheral surface 74 of the opening 73 of the casing 72, and the gasket portion 4 and the casing 72 are sealed.

  In the seal portion 5, the first lip portion 51 and the second lip portion 52 are in liquid-tight contact with the outer surface 75 of the shaft 71, and the first lip portion 51 and the second lip portion are in contact with each other. The space between the portion 52 and the shaft 71 is sealed. Thereby, the two-stage washing water is sealed. Further, the tip of the protrusion 53 is in contact with the outer surface 75 of the shaft 71.

  As described above, the space 55 defined by the first lip 51 and the protrusion 53 is sealed by the outer surface 75 of the shaft 71. The space 55 is filled with grease 7, and the filled grease 7 lubricates the contact portion between the lip tip 54 of the first lip 51 and the shaft 71.

  The seal portion 5 is provided with a dust lip 57 on the motor side of the first lip portion 51. For this reason, the dust lip 57 can prevent foreign matter from entering between the first lip portion 51 and the shaft 71 from the motor side. Further, the dust lip 57 extends toward the outer surface 75 of the shaft 71 obliquely toward the inner peripheral side in the motor side direction, and between the first lip portion 51 and the shaft 71 from the motor side. It effectively prevents foreign objects from entering.

  As described above, according to the washing machine sealing device 1 according to the embodiment of the present invention, the dust lip 57 suppresses the entry of foreign matter from the motor side toward the first lip portion 51. The occurrence of wear of the first lip portion 51 due to the above can be suppressed, and the durability of the sealing device 1 can be improved.

  In the washing machine sealing device 1 according to the embodiment of the present invention, the seal portion 5 includes the two seal portions of the first seal portion 51 and the second seal portion 52. The seal part 5 may not include the second seal part 52. In addition, although the protruding portion 53 is in contact with the shaft 71, the protruding portion 53 may have a gap between the protruding portion 53 and the shaft 71.

  The embodiment of the present invention has been described above, but the present invention is not limited to the embodiment of the present invention, and includes all aspects included in the concept of the present invention and the scope of the utility model registration request. In addition, the configurations may be appropriately combined as appropriate so as to achieve at least part of the problems and effects described above. For example, the shape, material, arrangement, size, and the like of each component in the above embodiment can be changed as appropriate according to the specific usage mode of the present invention. Specifically, the shapes of the gasket portion 4, the seal portion 5, and the reinforcing ring 3 are not limited to the shapes described above. Further, the present invention can be applied to all configurations that can utilize the effects produced by the present invention.

1,100 Washing machine sealing device 2 Main body 3 Reinforcing ring 4,110 Gasket portion 5,120 Seal portion 6,123 Spring 7 Grease 41 Outer peripheral surface 42 Fastening margin portions 51, 121 First lip portion 52, 122 Second Lip part 53, 124 Projection part 54 Lip tip part 55, 107 Space 56 Recess 57 Dustrip 71, 101 Shaft 72, 103 Casing 73, 106 Opening 74 Inner peripheral surface 75 Outer surface 102 Washing tub 104 Housing 105 Bearing x Axis line

Claims (7)

A sealing device for a washing machine for sealing between a shaft that transmits the power of a motor to rotate the washing tub and a casing that houses the washing tub,
It has an annular body centered on the axis,
The main body includes an annular gasket portion centered on an axis, which is attached to the casing, and a seal portion that is slidably in close contact with the outer surface of the shaft,
The sealing device according to claim 1, wherein the seal portion includes an annular dust strip centered on the axis at an end of the motor.   The sealing device for a washing machine according to claim 1, wherein the dust lip is an extending piece extending toward the axis.   3. The sealing device for a washing machine according to claim 2, wherein the dust lip is an extending piece extending toward the motor.   The seal portion forms an annular first lip portion centered on the axis and slidably in close contact with the outer surface of the shaft, and a space filled with grease and held together with the first lip portion. In order to do this, it is provided with the cyclic | annular protrusion part centering on the said axis line provided in the said washing tub side with respect to the said 1st lip | rip part. The sealing device for a washing machine as described.   The said 1st lip | rip part has a protruding ridge body toward the said axis line, The shape of the cross section in the surface along the said axis line of this ridge body is a wedge shape, It is characterized by the above-mentioned. Sealing device for washing machines.   The seal portion includes an annular second lip portion centered on the axis, which is slidably in close contact with the outer surface of the shaft, on the side of the washing tub with respect to the protrusion portion. The sealing device for a washing machine according to claim 4 or 5.   The sealing device for a washing machine according to claim 6, wherein the second lip portion is an extended piece extending toward the washing tub.

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