A belt pulley for a drum washing machine and a drum washing machine

Abstract

The application discloses a pulley for a drum washing machine and the drum washing machine, the pulley is integrally stamped from sheet metal material, comprising a ring and a ring disc, the ring is a hollow cylindrical structure as a whole, one end extends radially outward to form a first flange, the other end contracts radially inward to form a ring disc, a plurality of uniformly distributed lightening process holes are arranged on the ring disc, the ring disc is arranged protruding in the direction away from the ring along the axial direction, the contraction end of the ring disc is formed with a central shaft hole coaxially arranged with the ring, the edge of the central shaft hole is formed with a second flange folded in the direction close to the ring along the axial direction of the pulley, the pulley integrally stamped in the application is different from the die casting material in most pulley schemes at present, the die process of the sheet metal stamping material is lower in cost than die casting, the cost of parts is low, in addition, the sheet metal has good ductility and will not break under high-strength work of the pulley, and simultaneously has the characteristics of low cost and high safety.

Description

Technical Field

[0001] This invention relates to a pulley for a drum washing machine, specifically to a pulley for a drum washing machine and a drum washing machine. Background Technology

[0002] The inner drum of a drum washing machine is usually rotated by a motor-driven belt that drives a pulley. Existing pulley designs are mostly made of cast aluminum, which is expensive and costly.

[0003] Existing pulley designs are primarily made of cast aluminum, resulting in high costs. For example, utility model application CN201220299904.5 discloses a composite pulley for drum washing machines, which is less expensive than all-aluminum pulleys and avoids the drawbacks of low strength, easy deformation, and easy breakage associated with all-aluminum pulleys. It also improves upon the low strength and easy deformation issues at the joint between the all-stamped steel pulley and the central shaft hole. However, this utility model's pulley is not a one-piece structure, which can easily lead to safety hazards due to breakage at the connection point during use. Furthermore, the structure of this utility model's pulley is still complex for drum washing machines, resulting in relatively high costs.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a pulley for a drum washing machine. The pulley is integrally stamped from sheet metal and has an annular ring and an annular disc. The annular ring is a hollow cylindrical structure. One end of the annular ring tapers inward along the radial direction to form the annular disc. The annular disc protrudes axially away from the annular ring, so that the pulley has a recessed structure that matches the assembly structure of the drum washing machine.

[0006] Another object of the present invention is to provide a drum washing machine equipped with the aforementioned pulley.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a pulley for a drum washing machine, the pulley being integrally stamped from sheet metal, comprising:

[0008] The ring-shaped structure is hollow cylindrical in shape.

[0009] The annular disk is formed by radially contracting inward from one end of the annular ring, and the whole is convex in the axial direction away from the annular ring.

[0010] The annular disk has a central shaft hole at its contracted end, and the central shaft hole is coaxially arranged with the annular ring.

[0011] Optionally, the annular disk includes a first pressing pattern, which is formed by gradually shrinking from one end of the annular ring along the axial direction away from the annular ring, forming a frustum-shaped protrusion at one end of the annular ring, with the central shaft hole located at the end of the frustum-shaped protrusion.

[0012] Optionally, at least one through-hole for weight reduction is formed on the circumferential surface of the first molding, and multiple weight reduction holes are distributed in a circumferential array along the first molding.

[0013] Preferably, the weight reduction process hole is obtained by sweeping a circular through hole through the first pressing pattern at a set angle with the center of the central shaft hole as the center.

[0014] Optionally, the annular disk further includes a first annular surface, which is circular and forms by radial contraction from one end of the annular ring. The annular ring is connected to the first pressing mold through the inner edge of the first annular surface.

[0015] Optionally, the annular disk further includes a second pressing pattern, which is formed by contracting axially from the inner peripheral end of the first pressing pattern toward the annular ring, and forming a frustum-shaped recess at the end of the first pressing pattern that is opposite to the protruding direction of the first pressing pattern; the central shaft hole is located at the center of the frustum-shaped recess.

[0016] Preferably, a third annular surface is formed by radially contracting inward from the radial inner edge of the second molding, and a central shaft hole is formed at the radial inner edge of the third annular surface.

[0017] Optionally, a second flange is formed at the edge of the central shaft hole, which is folded towards the annular ring along the pulley axis.

[0018] Optionally, it also includes a first flange that is circular in shape, which is formed by folding the first flange outward radially from the end of the circular ring;

[0019] Preferably, the first flange is located at the end of the annular ring away from the annular disk.

[0020] Optionally, a second annular surface is formed between the first molding die and the second molding die, and the first molding die and the second molding die are respectively connected to the outer edge and the inner edge of the second annular surface;

[0021] The second annular surface is coaxially arranged with the third and first annular surfaces and is parallel to each other.

[0022] The second aspect of the present invention provides a drum washing machine using the above-mentioned pulley, the technical solution being: a drum washing machine equipped with a pulley.

[0023] It includes an inner cylinder shaft, a pulley, and a pulley screw; the end of the inner cylinder shaft is provided with a threaded hole that matches the pulley screw, and the pulley is fastened to the end of the inner cylinder shaft by the pulley screw;

[0024] A clearance structure is formed at the connection between the threaded hole and the end of the inner cylinder shaft. When the pulley and the inner cylinder shaft are assembled in place, the second flange is embedded in the clearance structure. This invention has at least the following beneficial effects:

[0025] 1. The pulley in this invention is integrally stamped from sheet metal, unlike the die-cast material used in most current pulley solutions. The mold process for sheet metal stamping is cheaper than that for die casting, resulting in lower component costs. In addition, sheet metal has excellent ductility and will not break under high-intensity operation of the pulley, ensuring both safety and durability.

[0026] 2. In this solution, the sheet metal stamping material pulley utilizes a first flange, a second flange, a first pressing, and a second pressing structure to improve the overall strength of the pulley; the first flange also prevents the belt from tangling; the cooperation of the first pressing and the second pressing leaves a gap between the pulley and the bearing support, preventing friction between the pulley and the bearing support during operation and reducing noise; the second flange at the screw mounting point of the pulley prevents deformation when the pulley screws are tightened and also has the function of engaging with the bearing support of the drum washing machine.

[0027] 3. The sheet metal stamping material pulley in this solution has a weight reduction process hole, which further reduces the material cost of the pulley and also reduces the weight of the pulley, which helps to reduce the motor load and improve the energy utilization rate of the washing machine. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the pulley structure of the drum washing machine according to the present invention in one direction.

[0029] Figure 2 This is a schematic diagram of the pulley for the drum washing machine according to the present invention from another direction.

[0030] Figure 3 This is a schematic diagram of a washing machine equipped with the pulley for a drum washing machine according to the present invention.

[0031] 1. Pulley; 11. Annular disc; 12. Annular ring; 13. First flange; 14. Second flange; 111. First annular surface; 112. Second annular surface; 113. Third annular surface; 120. Weight reduction process hole; 121. First pressing; 122. Second pressing; 130. Central shaft hole; 2. Pulley screw; 21. Pulley screw head; 3. Belt; 4. Bearing support seat; 5. Inner cylinder shaft; 6. Motor. Detailed Implementation

[0032] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Those skilled in the art will understand that the following embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] The pulley 1 in this invention is integrally stamped from sheet metal, unlike the die-cast material used in most current pulley 1 designs. The mold process for sheet metal stamping is cheaper than that for die casting, resulting in lower component costs. In addition, sheet metal has excellent ductility and will not break under high-intensity operation, ensuring both safety and durability.

[0036] Example 1

[0037] As a specific embodiment of the present invention, this embodiment provides a washing machine pulley 1. The pulley 1 includes an annular disc 11 and an annular ring 12 integrally stamped. The annular ring 12 has a hollow cylindrical structure. The annular disc 11 is formed by radially contracting from one end of the annular ring 12. The annular disc 11 protrudes outward along the axial direction from the end of the annular ring 12 connected to the annular disc 11, so that the interior of the pulley 1 is recessed towards the side where the annular disc 11 is located. The contracted end of the annular disc 11 forms a central shaft hole 130, which is coaxially arranged with the annular ring 12.

[0038] Furthermore, the end of the annular ring 12 extends radially outward to form a first flange 13, and the provision of the first flange 13 is beneficial to strengthening the structural strength of the pulley 1.

[0039] Preferably, the first flange 13 is located at the end of the annular ring 12 away from the annular disk 11.

[0040] As an embodiment of the present invention, the annular disk 11 includes a first pressing pattern 121 formed by gradually contracting from one end of the annular ring 12 in the axial direction away from the annular ring 12. A frustum-shaped protrusion is formed at one end of the annular ring 12, and the central shaft hole 130 is located at the end of the frustum-shaped protrusion. Since the first pressing pattern 121 forms an inclined surface on the pulley 1, the recessed space inside the pulley 1 is increased. The recessed space can cooperate with the electrical components that assemble the pulley 1, avoiding the pulley 1 from protruding out of the electrical components as a whole, and improving the assembly effect of the pulley 1.

[0041] Furthermore, in order to reduce the overall weight of the pulley 1, without affecting the structural strength of the pulley 1, a plurality of weight-reducing process holes 120 are formed on the circumferential surface of the first pressing 121. The presence of the weight-reducing process holes 120 further reduces the weight and manufacturing cost of the pulley 1.

[0042] Specifically, in this embodiment, the weight reduction process hole 120 is obtained by sweeping a circular through hole through the first pressing 121 at a certain angle with the axis of the pulley 1 as the center; or as an alternative to the above solution, the weight reduction process hole 120 can also be obtained by sweeping a polygonal through hole through the first pressing 121 at a certain angle with the axis of the pulley 1 as the center. The weight reduction process hole 120 formed by sweeping is coaxially arranged with the pulley 1, which is also beneficial to reduce the wind resistance generated when the pulley 1 is working.

[0043] Furthermore, in order to make the center of gravity of the pulley 1 more stable when it is working, the weight reduction process holes 120 are arrayed along the central shaft hole 130 on the first pressing 121, and the number of weight reduction process holes 120 is preferably set to three.

[0044] Furthermore, in order to reduce the weight of the pulley 1 while strengthening its structural strength, a second flange 14 is formed at the edge of the central shaft hole 130, which is folded towards the annular ring 12 along the axial direction of the pulley 1.

[0045] In this embodiment, the pulley 1 is formed by stamping from a passivated hot-dip galvanized sheet, and the surface is treated with anti-rust treatment, such as galvanizing and electrophoresis, which enhances the durability and aesthetics of the pulley 1.

[0046] Conventional improvements to the material of pulley 1 made by those skilled in the art based on the known technical principles of this invention also fall within the protection scope of this invention.

[0047] Example 2

[0048] As one embodiment of the present invention, this embodiment makes the following improvements based on Embodiment 1.

[0049] In this embodiment, the central shaft hole 130 located at the center of the first molding 121 is recessed in the axial direction towards the annular ring 12. The recess accommodates the connection structure of the pulley 1 to the electrical appliance, further improving the assembly effect of the pulley 1.

[0050] Specifically, a second molded form 122 is formed between the first molded form 121 and the central shaft hole 130. The second molded form 122 is formed by contracting axially towards the annular ring 12 from the extension end of the first molded form 121. The inner edge of the second molded form 122 contracts radially inward to form a third annular surface 113. The third annular surface 113 is circular. The central shaft hole 130 is formed on the inner circumference of the third annular surface 113 and is coaxially arranged with the pulley 1. When the pulley 1 is assembled onto the electrical appliance through the central shaft hole 130, the third annular surface 113 can be used for contact connection structure. The cooperation between the third annular surface 113 and the second molded form 122 enhances the strength at the central shaft hole 130, which can prevent deformation when the pulley 1 is assembled in place, and further strengthens the structural strength of the pulley 1.

[0051] Example 3

[0052] As another embodiment of the present invention, this embodiment is further improved on the basis of embodiment two as follows.

[0053] In this embodiment, the annular disk 11 further includes a first annular surface 111. The first annular surface 111 is circular and is formed by radial contraction from one end of the annular ring 12. The annular ring 12 is connected to the first pressing 121 through the inner edge of the first annular surface 111. The first annular surface 111 and the first flange 13 cooperate to significantly improve the strength of the annular ring 12, prevent the annular ring 12 from deforming, and improve the strength of the pulley 1.

[0054] Furthermore, a second annular surface 112 is provided between the first pressing mold 121 and the second pressing mold 122. The second annular surface 112 is annular in shape, parallel to the third annular surface 113 and the first annular surface 111, and coaxially arranged with the third annular surface 113 and the first annular surface 111. The first pressing mold 121 and the second pressing mold 122 are respectively connected to the outer edge and the inner edge of the second annular surface 112. The arrangement of the first annular surface 111 and the second annular surface 112 not only further strengthens the structural strength of the pulley 1, but also helps to reduce the overall thickness of the pulley 1, so that it can occupy less space when assembled into an electrical appliance.

[0055] To further enhance the structural strength of the pulley 1, the first annular surface 111, the first pressed surface 121, the second annular surface 112, the second pressed surface 122, and the third annular surface 113 are smoothly connected.

[0056] Furthermore, in order to improve the weight reduction effect of the weight reduction process hole 120 on the first molding 121, the first molding 121 has the largest proportion on the annular disk 11.

[0057] In another embodiment of the present invention, the edge of the central shaft hole 130 on the annular disk 11 has a second flange 14 formed by folding it axially toward the annular ring 12, which further improves the strength of the central shaft hole 130.

[0058] A second aspect of the present invention provides a drum washing machine employing the pulley 1 described in the above embodiments, as detailed below.

[0059] Example 4

[0060] As another embodiment of the present invention, such as Figure 3 As shown, this embodiment provides a drum washing machine with a pulley 1 as described in Embodiment 3. The drum washing machine includes an inner drum shaft 5, a bearing support 4, a pulley 1, a pulley screw 2, a belt 3, and a motor 6. The pulley 1 is fastened to the inner drum shaft 5 protruding from the bearing support 4 by the pulley screw 2, and then the belt 3 is installed and fixed on the motor 6 and the pulley 1.

[0061] Furthermore, the pulley 1 in this invention is designed as a protruding hollow structure, which reduces its own weight while ensuring strength. It can also cooperate with the structure of the inner drum shaft 5, bearing support seat 4, and motor 6, so that the pulley 1 can be closer to the bottom of the outer drum when it is assembled, making the components inside the drum washing machine fit together more compactly.

[0062] Furthermore, the motor 6 is a frequency converter, which rotates directly through the belt 3, pulley 1, and inner cylinder shaft 5 connected to the pulley 1.

[0063] Furthermore, the surface of the inner cylinder shaft 5 abuts against the third annular surface 113, and the inner cylinder shaft 5 and the pulley 1 have a sufficiently large contact area, making it easier to install the pulley 1 in place and more stable during operation.

[0064] Furthermore, the inner cylinder shaft 5 has a threaded hole at its center for the pulley screw 2 to be inserted. The opening of the threaded hole is located at the center of the cross section where the inner cylinder shaft 5 abuts against the third annular surface 113. When the pulley 1 is installed in place, one end of the pulley screw 2 is fixed to the inner cylinder shaft 5 by engaging with the threaded hole at the center of the inner cylinder shaft 5 through the central shaft hole 130.

[0065] Furthermore, the other end of the pulley screw 2 has a pulley screw head 21. Due to the presence of the second compression molding 122, the central shaft hole 130 is slightly recessed, which can at least partially accommodate the pulley screw head 21, preventing the pulley screw head 21 from protruding too much and colliding with other structures of the drum washing machine. Furthermore, in order to further reduce the thickness of the outer drum of the drum washing machine, the protrusion height of the annular disc 11 is not higher than the height of the pulley screw head 21, which can prevent the pulley 1 from rubbing against the rear cover of the drum washing machine, further improving the working efficiency of the pulley 1.

[0066] Furthermore, when the pulley 1 is installed in place on the drum washing machine, the second flange 14 is inserted into the threaded hole at the center of the cross-section where the inner drum shaft 5 contacts the third annular surface 113, further enhancing the stability of the connection between the pulley 1 and the inner drum shaft 5.

[0067] To ensure the stability of belt 3 working on pulley 1, the width of ring 12 in the axial direction of pulley 1 is greater than the width of belt 3.

[0068] Furthermore, when the motor 6 is installed in place, in order to ensure the stability of the belt 3 during operation, the part of the motor 6 that connects to the belt 3 is flush with the height of the annular ring 12.

[0069] Furthermore, in order to ensure the stability of the pulley 1 during operation, a coating is provided on the surface of the annular ring 12 that contacts the belt 3 to increase the friction of the belt 3, which can prevent the pulley 1 from slipping during operation and thus enhance the stability of the drum washing machine during operation.

[0070] Furthermore, due to the presence of the first flange 13, while strengthening the pulley 1, it also prevents the belt 3 from coming off the pulley 1 towards the outer drum, and prevents the belt 3 from getting tangled, further enhancing the safety of the drum washing machine during operation.

[0071] In another embodiment of the present invention, in order to strengthen the connection between the pulley screw 2, the pulley 1 and the inner cylinder shaft 5, the end of the central shaft hole 130 of the pulley 1 is preferably set as a polygonal structure. At the same time, the threaded holes at the center of the pulley screw 2 and the inner cylinder shaft 5 are also set as corresponding shapes.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A drum washing machine, comprising a pulley (1), characterized in that, The pulley (1) is integrally stamped from sheet metal, and the pulley (1) includes: The ring (12) has a hollow cylindrical structure. An annular disk (11) is disposed on the end face of the annular ring (12), including a first pressing mold (121) and a second pressing mold (122). The first pressing mold (121) gradually contracts from one end of the annular ring (12) in the axial direction away from the annular ring (12) to form a frustum-shaped protrusion; the second pressing mold (122) contracts from the inner circumferential end of the first pressing mold (121) in the axial direction towards the annular ring (12) to form a frustum-shaped recess opposite to the protrusion direction of the first pressing mold (121). A third annular surface (113) is formed by radially contracting inward from the radial inner edge of the second molding (122). A central shaft hole (130) is formed on the radial inner edge of the third annular surface (113). The central shaft hole (130) is coaxially arranged with the annular ring (12). A second flange (14) is formed at the edge of the central shaft hole (130) by folding it in the direction close to the annular ring (12) along the axial direction of the pulley (1). The annular disk (11) further includes a first annular surface (111), which is circular. The first annular surface (111) is formed by radial contraction from one end of the annular ring (12). The annular ring (12) is connected to the first molded form (121) through the inner edge of the first annular surface (111). A second annular surface (112) is formed between the first molding (121) and the second molding (122). The first molding (121) and the second molding (122) are respectively connected to the outer edge and the inner edge of the second annular surface (112). The second annular surface (112) is coaxially arranged with the third annular surface (113) and the first annular surface (111) and is parallel to each other. The pulley screw (2) is inserted into the central shaft hole (130); The inner cylinder shaft (5) has a threaded hole at its end that is compatible with the pulley screw (2), and the pulley (1) is fastened to the end of the inner cylinder shaft (5) by the pulley screw (2); The connection between the threaded hole and the end of the inner cylinder shaft (5) forms a clearance structure. When the pulley (1) and the inner cylinder shaft (5) are assembled in place, the second flange (14) is embedded in the clearance structure.

2. A drum washing machine according to claim 1, characterized in that, At least one through-hole (120) is formed on the circumferential surface of the first molding (121), and multiple weight reduction process holes (120) are distributed in a circumferential array along the first molding (121).

3. A drum washing machine according to claim 2, characterized in that, The weight reduction process hole (120) is obtained by sweeping the circular through hole through the first pressing (121) at a set angle with the center of the central shaft hole (130) as the center.

4. A drum washing machine according to claim 1, characterized in that, It also includes, The first flange (13) is circular in shape and is formed by folding outward radially from the end of the ring (12).

5. A drum washing machine according to claim 4, characterized in that, The first flange (13) is located at the end of the annular ring (12) away from the annular disk (11).

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