Stroke head structure of tubular motor

Abstract

The utility model discloses a stroke head structure of a tubular motor, which comprises an outer end cover, an inner end cover and a connecting piece, the outer end cover and the connecting piece are respectively connected and fixed with the inner end cover through two opposite sides of the inner end cover along the axial direction of the tubular motor, and the inner end cover comprises a base. One side, far away from the outer end cover, of the base is sunken towards the outer end cover to form an annular slot, and a lug boss which protrudes outwards in the radial direction is formed on the periphery of the slot; the connecting piece comprises a first connecting structure inserted into the inserting groove and the protruding part, and the first connecting structure is matched with the inserting groove and the protruding part in shape. Compared with the prior art, the utility model has the advantages that the connection part of the inner end cover and the connecting piece is not cylindrical, so that the rotating torsion borne by the inner end cover can be dispersedly transmitted to the connecting piece, the stress points are not concentrated, and the structural strength is improved.

Description

Technical Field

[0001] This utility model relates to a power device, and more particularly to a stroke head structure for a tubular motor. Background Technology

[0002] The stroke head is the end of the stroke, the part exposed outside the motor steel tube. One end is fixedly connected to the motor steel tube, and the other end is fixedly connected to the user equipment. It serves to transmit rotational motion and withstand the torsional shear force of the load. For example, Chinese Patent Application No. 202321607756.3 discloses a stroke head for electronic control of a tubular motor, including an electrical control bracket. One end of the electrical control bracket is connected to the circuit board sheath base and the circuit board sheath cover, and the other end of the electrical control bracket is equipped with an internal gear stroke sleeve; an inner end cover, an outer end cover is installed on the outside of the inner end cover, and the outer end cover, inner end cover, internal gear stroke sleeve, and electrical control bracket are fixedly connected; a power cord, one end of which passes through the inner end cover, internal gear stroke sleeve, and electrical control bracket in sequence, and is connected to the circuit board.

[0003] Existing stroke heads are mainly divided into high-power and low-power types, each with its own structural design. The low-power motor stroke head uses plastic injection-molded parts for its main load-bearing bracket. Because it needs to withstand torsional forces, firstly, ordinary plastics are insufficient; high-strength, high-performance plastics are required, inevitably leading to higher prices and costs. Secondly, structurally, hollow, thin-walled structures cannot be used; existing plastic stroke head brackets generally have uneven wall thickness in certain areas. This results in the surface roundness, flatness, and smoothness of the area where the internal gear ring is installed after injection molding not meeting requirements, necessitating further machining, which involves numerous processes. The high-power motor stroke head bracket uses zinc-aluminum alloy parts. This process has relatively high costs, high energy consumption, and is not environmentally friendly. Furthermore, due to limitations in the installation position of internal parts, it usually requires the assembly of multiple parts. The availability of two power specifications also increases material management costs. In actual production applications, both the plastic and zinc-aluminum alloy components still have insufficient load-bearing capacity, leading to some instances of torsional breakage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a stroke head structure for a tubular motor with improved strength, addressing the shortcomings of the existing technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: a stroke head structure for a tubular motor, including an outer end cover, an inner end cover, and a connecting member. Along the axial direction of the tubular motor, the outer end cover and the connecting member are respectively connected and fixed to the inner end cover from opposite sides of the inner end cover. The characteristic of this invention is:

[0006] The inner end cap includes a base, on which an annular slot is formed by a recess on the side away from the outer end cap toward the outer end cap, and a radially outward protrusion is formed around the periphery of the slot.

[0007] The connector includes a first connecting structure that is inserted into a slot and a protrusion, the shape of the first connecting structure matching the slot and the protrusion.

[0008] By making the connection between the inner end cover and the connector non-cylindrical, the rotational torque on the inner end cover can be distributed to the connector, and the stress point is not concentrated, thereby improving the structural strength and load-bearing capacity. It can easily meet the requirements of existing 45 motors for both low and high power. On the one hand, it greatly enhances the load-bearing capacity and reliability and reduces the occurrence of torsion breakage; on the other hand, it eliminates the need for separate design for different specifications and materials, reducing material management costs and production line management costs.

[0009] Furthermore, in order to ensure that the rotational torque on the inner end cap can be evenly transmitted to the connector, the protrusion is in the shape of an outwardly protruding arc, and the protrusion is evenly arranged along the circumference and is centrally symmetrical, with a smooth transition between adjacent protrusions, so that the slot and the protrusion together form a petal-shaped groove.

[0010] To further improve strength, the inner end cap is an integral injection-molded part, and the first connecting structure is a hollow metal part.

[0011] Furthermore, the base is provided with a first receiving groove, which contains a worm gear for adjusting the stroke, thereby facilitating the installation of the worm gear.

[0012] Furthermore, a second receiving groove is provided on the base, the second receiving groove passing through the base in a direction parallel to the axial direction of the tubular motor, and the stroke head structure also includes a power cord and plug passing through the second receiving groove, thereby facilitating the installation of the power cord and plug.

[0013] Furthermore, the connector also includes a second connecting structure located outside the base, with an internal gear ring sleeved on the outer periphery of the second connecting structure, thereby facilitating the installation of the internal gear ring for torque transmission.

[0014] Furthermore, to facilitate the transmission of torque to the travel limiting device of the tubular motor, the travel head structure also includes a transmission gear for travel transmission. A through hole is provided on the peripheral wall of the second connecting structure of the connector. An extension portion is formed on the side of the base away from the outer end cover and extending into the second connecting structure. The extension portion corresponds to the through hole and is recessed in the direction away from the through hole. The transmission gear passes through the through hole and is placed on the extension portion. The transmission gear meshes with the internal gear ring.

[0015] Furthermore, the second connecting structure has a mounting hole, and a sealing ring is also fitted around the outer periphery of the second connecting structure. The position of the sealing ring corresponds to the mounting hole. Through the mounting hole, the connecting part can be fixed to the tubular motor housing using fasteners such as screws, while the sealing ring can make the connection have good sealing performance.

[0016] Compared with the prior art, the advantages of this utility model are as follows: by making the connection between the inner end cover and the connector non-cylindrical, the rotational torque on the inner end cover can be distributed to the connector, and the stress point is not concentrated, thereby improving the structural strength and bearing capacity. It can easily meet the requirements of existing 45 motors for both low and high power. On the one hand, it greatly enhances the bearing capacity and reliability and reduces the occurrence of torsion breakage; on the other hand, it eliminates the need for separate design for different specifications and materials, reducing material management costs and production line management costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the stroke head structure according to an embodiment of the present utility model;

[0018] Figure 2 This is an exploded view of the stroke head structure according to an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the inner end cap of the stroke head structure according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the inner end cap of the stroke head structure according to an embodiment of the present invention (and...). Figure 3 (Different perspectives);

[0021] Figure 5 This is a schematic diagram of the connecting component of the stroke head structure according to an embodiment of the present utility model;

[0022] Figure 6 This is a cross-sectional view of the stroke head structure according to an embodiment of the present utility model. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0025] See Figures 1-6 A stroke head structure for a tubular motor includes an outer end cover 1, a power cord and plug 2, an adjusting worm gear 3, an inner end cover 4, a transmission gear 5, a connecting piece 6, and an internal gear ring 7.

[0026] The outer end cover 1 is fixed to the outside of the inner end cover 4, where "outer side" refers to the side away from the motor core along the axial direction of the tubular motor. The inner end cover 4 can be a one-piece injection-molded plastic part, including a base 41. The base 41 has a first receiving groove 42 that penetrates the peripheral wall of the base 41. Thus, the adjusting worm gear 3 can be inserted into the first receiving groove 42 to drive the lead screw of the internal stroke limiting device of the motor for stroke adjustment and setting. The base 41 also has a second receiving groove 43 that penetrates the base 41 in a direction parallel to the axial direction of the tubular motor, for the power cord and plug 2 to pass through. The power cord and plug 2 are a composite part that can be fixed to the base 41 with screws.

[0027] A slot 44 is formed on the side of the base 41 away from the outer end cover 1, recessed towards the outer end cover 1. The slot 44 is annular and allows the connector 6 to be inserted. The connector 6 is a metal part, such as a steel plate or a deep-drawn steel plate, and is an integral structure that is approximately tubular with open ends. The connector 6 includes a first connecting structure 61 and a second connecting structure 62, with the outer diameter of the first connecting structure 61 being larger than that of the second connecting structure 62. The first connecting structure 61 is used to connect with the inner end cover 4, while the internal gear ring 7 is fitted around the outer periphery of the second connecting structure 62. The first connecting structure 61 is inserted into the slot 44, while the second connecting structure 62 protrudes from the side of the base 41 away from the outer end cover 1. The slot 44 is close to the outer peripheral wall of the base 41, meaning that the first connecting structure 61 covers part of the outer periphery of the base 41, effectively giving the base 41 a metal shell. This allows the rotational torque on the inner end cover 4 to be transmitted to the connector 6, improving structural strength.

[0028] During the operation of the tubular motor, the connector 6 is the main component bearing the torsional shear force of the load. The slot 44 is annular, with an outward (radially outward) protrusion 441 formed on its periphery. The slot 44 and the protrusion 441 are connected to transmit rotational torque. To ensure that the rotational torque on the inner end cover 4 can be evenly and dispersedly transmitted to the first connecting structure 61 of the connector 6, preferably, the protrusion 441 is an outwardly protruding arc shape, and the protrusions 441 are evenly arranged circumferentially and are centrally symmetrical. Adjacent protrusions 441 are smoothly transitioned, thereby forming a petal-shaped groove with the slot 44 and the protrusions 441 as a whole. This shape prevents the stress points from concentrating, thereby improving strength. The shape of the first connecting structure 61 matches the overall shape of the slot 44 and the protrusions 441.

[0029] The protrusion 441 extends at least partially through the outer peripheral wall of the base 41 in the circumferential direction, thereby exposing the first connecting structure 61 on the peripheral wall of the base 41. The user equipment (load) fixing component is snapped onto the outer periphery of the first connecting structure 61, and the force is directly transmitted to the housing of the tubular motor through the connector 6 (the connection method between the housing and the connector 6 will be described in detail below). The inner end cover 4 and the connector 6 can be assembled as two parts, or the connector 6 can be injection molded as an insert of the inner end cover 4. Injection molding as an insert can better solve the sealing problem.

[0030] The second connecting structure 62 of the connector 6 is generally cylindrical, with a through hole 621 on its peripheral wall. An extension 45 extends from the side of the base 41 away from the outer end cover 1 into the second connecting structure 62. The extension 45 corresponds to the through hole 621 and is recessed away from the through hole 621. This allows the transmission gear 5 to be inserted into the connector 6 through the through hole 621 after the inner end cover 4 and the connector 6 are installed, and thus placed on the extension 45. The transmission gear 5 meshes with the internal gear ring 7 and is also interlocked with the intermediate gear of the motor's internal stroke, achieving stroke transmission.

[0031] The second connecting structure 62 has mounting holes 622, through which screws can be passed to fix the connector 6 and the housing of the tubular motor. The inner end cover 4 can also be fixed to the plastic bracket inside the tubular motor with screws. That is, both the connector 6 and the inner end cover 4 are fixed parts. When the tubular motor is running, the fixed parts will be subjected to torque when the shaft outputs torque. A sealing ring 8 is also fitted around the outer periphery of the second connecting structure 62. The internal gear ring 7 is located on the side closer to the first connecting structure 61, while the sealing ring 8 is located on the side away from the first connecting structure 61. The position of the sealing ring 8 corresponds to the mounting holes 622, that is, the screws that fix the connector 6 to the housing also pass through the sealing ring 8. The sealing ring 8 seals the connection between the connector 6 and the housing of the tubular motor.

Claims

1. A stroke head structure for a tubular motor, comprising an outer end cover (1), an inner end cover (4), and a connecting member (6), wherein, along the axial direction of the tubular motor, the outer end cover (1) and the connecting member (6) are respectively connected and fixed to the inner end cover (4) by opposite sides of the inner end cover (4), characterized in that: The inner end cap (4) includes a base (41), and an annular slot (44) is formed on the side of the base (41) away from the outer end cap (1) in the direction of the outer end cap (1). A radially outward protrusion (441) is formed around the slot (44). The connector (6) includes a first connection structure (61) that is inserted into a slot (44) and a protrusion (441), the shape of which matches the slot (44) and the protrusion (441).

2. The stroke head structure of the tubular motor according to claim 1, characterized in that: The protrusion (441) is an outwardly protruding arc shape, and the protrusions (441) are evenly arranged along the circumference and are centrally symmetrical. The adjacent protrusions (441) are smoothly transitioned, so that the slot (44) and the protrusions (441) together form a petal-shaped groove.

3. The stroke head structure of the tubular motor according to claim 1, characterized in that: The inner end cap (4) is an integral injection molded part, and the first connecting structure (61) is a hollow metal part.

4. The stroke head structure of the tubular motor according to claim 1, characterized in that: The base (41) is provided with a first receiving groove (42), and the first receiving groove (42) contains a worm gear (3) for adjusting the stroke.

5. The stroke head structure of the tubular motor according to claim 1, characterized in that: The base (41) is also provided with a second receiving groove (43), which penetrates the base (41) in a direction parallel to the axial direction of the tubular motor. The stroke head structure also includes a power line and plug (2) passing through the second receiving groove (43).

6. The stroke head structure of the tubular motor according to claim 1, characterized in that: The connector (6) further includes a second connecting structure (62) located outside the base (41), and an internal toothed ring (7) is sleeved on the outer periphery of the second connecting structure (62).

7. The stroke head structure of the tubular motor according to claim 6, characterized in that: The stroke head structure also includes a transmission gear (5) for stroke transmission. The second connecting structure (62) of the connector (6) has a through hole (621) on its peripheral wall. The base (41) extends into the second connecting structure (62) from the side away from the outer end cover (1) to form an extension (45). The extension (45) corresponds to the through hole (621) and is recessed in the direction away from the through hole (621). The transmission gear (5) passes through the through hole (621) and is placed on the extension (45). The transmission gear (5) meshes with the internal gear ring (7).

8. The stroke head structure of the tubular motor according to claim 6, characterized in that: The second connecting structure (62) has an installation hole (622), and a sealing ring (8) is also fitted around the outer periphery of the second connecting structure (62). The position of the sealing ring (8) corresponds to the installation hole (622) mentioned above.

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