Lead screw transmission assembly and reduction gear box using same

Abstract

The utility model discloses a lead screw transmission assembly and a reduction gear box using the lead screw transmission assembly, and the lead screw transmission assembly comprises a lead screw which comprises a shaft-shaped body and a transmission connecting part arranged at one end of the shaft-shaped body; the planet carrier comprises a carrier body and an assembly hole which penetrates through the carrier body and is used for being tightly matched with the transmission connecting part; the end, extending into the assembling hole, of the transmission connecting part is further sleeved with a first fastening nut, and a limiting face suitable for being matched with one shaft side end of the first fastening nut in an abutting mode is formed in the assembling hole. The bearing set comprises a bearing sleeve arranged on the outer side of the frame body in a sleeving mode and a bearing arranged in the bearing sleeve and used for supporting the frame body to operate. The outer side wall of the frame body is provided with an annular limiting step used for being matched with one shaft side end of the bearing in an abutting mode, and the outer side wall of the frame body is further sleeved with a second fastening nut suitable for being matched with the other shaft side end of the bearing in an abutting mode. According to the utility model, the matching structure of the lead screw and the planet carrier can be optimized, so that the reliability and the stability of the lead screw in the using process are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a screw transmission assembly and a reduction gear box using the same. Background Art

[0002] As a crucial component of modern mechanical transmission systems, screw gearboxes are widely used in various automation equipment and precision manufacturing fields. Their core function is to achieve high-precision, high-efficiency torque transmission and speed conversion. Specifically, the overall structure of a screw gearbox directly affects the accuracy of torque transmission through the coordination between the screw and the gearbox.

[0003] In this regard, regarding the connection between the gearbox and the screw, the existing technology mostly adopts interference fit, interference fit plus spline supplemented by welding and other means. In the actual production and use process, the above connection methods have the following disadvantages:

[0004] The first issue is poor concentricity and perpendicularity of the screw. During the press-fitting process of the screw and the planetary carrier of the gearbox, concentricity and perpendicularity can be difficult to achieve, depending on factors such as screw length, the accuracy of the press-fit tooling, and welding parameters. This can cause the screw to wobble during operation, damaging the nut and reducing transmission efficiency.

[0005] Secondly, the axial force that the screw can withstand is limited.

[0006] Relying only on interference fit and fewer welded parts, the strength is low. When the screw is subjected to a large axial force, there is a risk that the screw will fall off relative to the planetary carrier. As an output transmission component, the main force on the screw itself is the axial force.

[0007] In this regard, publication number CN117090912A discloses a linear drive device, in which the screw shaft and the planetary carrier are connected by screws and glue. Although compared with the interference fit method, it can avoid the problem of the screw shaft falling off when subjected to a large axial force, the use of glue is not friendly to the operator on the one hand, and the control of the amount of glue is easily affected by the operator's experience on the other hand. Too much glue is likely to cause glue overflow, and too little glue will weaken the bonding effect.

[0008] Therefore, with respect to the matching mode of the lead screw and the planetary carrier, in order to address the problems existing in the different solutions adopted in the prior art, it is necessary to further improve the matching mode of the two. Utility Model Content

[0009] The purpose of the utility model is to provide a screw transmission assembly to solve the technical problem of optimizing the matching structure between the screw and the planet carrier.

[0010] The purpose of the utility model is to provide a reduction gearbox to solve the technical problem of optimizing the matching structure between the lead screw and the planet carrier therein.

[0011] The screw drive assembly of the present invention is realized as follows:

[0012] A screw transmission assembly, comprising:

[0013] A lead screw comprising a shaft-shaped body and a transmission connection portion provided at one end of the shaft-shaped body;

[0014] The planetary carrier comprises a frame body and an assembly hole penetrating the frame body for fastening with the transmission connection portion; the transmission connection portion is further provided with a first fastening nut on one end extending into the assembly hole, and a limiting surface is formed in the assembly hole for abutting against one shaft-side end of the first fastening nut;

[0015] The bearing group includes a bearing sleeve mounted on the outside of a frame body and a bearing mounted inside the bearing sleeve and used to support the operation of the frame body; the outer wall of the frame body is provided with an annular limiting step for abutting against one axial side end of the bearing, and the outer wall of the frame body is also provided with a second fastening nut suitable for abutting against the other axial side end of the bearing.

[0016] In an optional implementation of the present invention, the assembly hole is a T-shaped hole; and

[0017] The assembly hole includes a large inner diameter hole for accommodating the first fastening nut and a small inner diameter hole suitable for the transmission connection part to pass through; the limiting surface is formed at the junction of the large inner diameter hole and the small inner diameter hole.

[0018] In an optional implementation of the present invention, the axial depth of the large inner diameter hole is not less than the axial length of the first fastening nut.

[0019] In an optional embodiment of the present invention, the end of the frame body facing away from the large inner diameter hole protrudes from one side end of the bearing sleeve; and

[0020] An external thread adapted to a second fastening nut is provided on the outer side wall of the end portion of the frame body facing away from the large inner diameter hole.

[0021] In an optional implementation of the present invention, the small inner diameter hole is a tapered hole, and the inner diameter of the tapered hole gradually decreases from the small inner diameter hole toward the large inner diameter hole; and

[0022] A tapered section adapted to the tapered hole is formed on the transmission connection portion.

[0023] In an optional implementation of the present invention, the bearing is an angular contact bearing.

[0024] The reduction gearbox of the present invention is realized as follows:

[0025] A reduction gearbox, comprising:

[0026] The planetary gear set connected to the planetary carrier of the screw transmission assembly, the inner gear ring arranged outside the planetary carrier and meshing with the planetary gear set, and the motor used to drive the planetary gear set to operate; wherein

[0027] The output shaft of the motor is provided with a transmission gear for connecting to the planetary gear set.

[0028] In an optional implementation of the present invention, a disc-shaped body is provided on the side end of the planet carrier body facing away from the second fastening nut;

[0029] The disc-shaped body is provided with a plurality of gear shafts for supporting the planetary gear set; and

[0030] The outer diameter of the disc-shaped body is smaller than the inner diameter of the inner gear ring.

[0031] In an optional implementation of the present invention, the inner gear ring portion extends to the outside of the bearing sleeve, so that the inner gear ring is fixed to the bearing sleeve through a plurality of first pins.

[0032] In an optional embodiment of the present invention, the motor is connected to the inner gear ring via a connector;

[0033] The connector is adapted to be fastened to the motor via screws; and

[0034] The connector is formed with a protrusion suitable for being embedded in the inner gear ring;

[0035] The protrusion is connected to the inner gear ring via a plurality of second pins.

[0036] By adopting the above technical solution, the utility model has the following beneficial effects: the screw drive assembly of the utility model and the reduction gearbox using the same are provided with an assembly hole in the planetary carrier. The process of assembling the screw and the planetary carrier only requires inserting the screw into the assembly hole, and does not require the assistance of tooling. Therefore, the verticality and concentricity of the screw are only related to the planetary carrier and are not affected by the assembly process. Therefore, by improving the verticality and concentricity of the screw and reducing the shaking of the end of the screw, the bearing capacity of the screw can be increased. Based on this, through the cooperation of the first fastening nut and the second fastening nut, on the basis of tightening the end of the screw, an axial preload force can also be provided to the bearing, which greatly improves the axial connection strength of the screw drive assembly and makes the screw drive assembly more stable and reliable.

[0037] In addition, for the fit between the screw and the assembly hole, the fit between the tapered hole and the tapered section can, on the one hand, eliminate the axis deviation and greatly improve the stability of the screw; on the other hand, the taper fit can increase the fit area between the screw and the assembly hole, thereby improving the bearing capacity of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the exploded structure of the reduction gearbox of the present utility model;

[0039] Figure 2 This is a schematic structural diagram of the reduction gearbox of the present invention from a first perspective;

[0040] Figure 3 This is a schematic structural diagram of the reduction gearbox of the present invention from a second perspective;

[0041] Figure 4 for Figure 3 sectional view of

[0042] Figure 5 This is a schematic structural diagram of the screw transmission assembly of the reduction gearbox of the present utility model.

[0043] In the figure: the shaft-shaped body 11, the transmission connection part 12, the tapered section 121, the first fastening nut 21, the second fastening nut 22, the large inner diameter hole 31, the small inner diameter hole 32, the limiting surface 33, the frame 4, the disc-shaped body 41, the external thread 42, the gear shaft 43, the limiting step 45, the inner ring 5, the planetary gear set 6, the connecting plate 71, the protrusion 72, the first pin shaft 81, the second pin shaft 82, the screw 83, the motor 9, the transmission gear 91, the nut 10, the bearing sleeve 201, the bearing 202, and the gasket 300. DETAILED DESCRIPTION

[0044] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0045] Example 1:

[0046] See also Figures 1 to 5 As shown, this embodiment provides a screw transmission assembly, including: a screw, a planetary carrier and a bearing group used in conjunction with each other.

[0047] Specifically, the lead screw comprises a shaft-like body 11 and a transmission connection portion 12 disposed at one end of the shaft-like body 11. The planetary carrier comprises a frame body 4 and an assembly hole extending through the frame body 4 for fastening with the transmission connection portion 12. The end of the transmission connection portion 12 extending into the assembly hole is also fitted with a first fastening nut 21. The assembly of the lead screw and the planetary carrier requires only the insertion of the lead screw into the assembly hole, without the need for tooling.

[0048] Based on the above structure, it should be noted that the assembly hole is a T-shaped hole; the assembly hole includes a large inner diameter hole 31 for accommodating the first fastening nut 21 and a small inner diameter hole 32 for the transmission connection part 12 to pass through. The inner diameter of the small inner diameter hole 32 is smaller than that of the large inner diameter hole 31.

[0049] In more detail, the small inner diameter hole 32 in this embodiment is a tapered hole, and the inner diameter of the tapered hole gradually decreases from the small inner diameter hole 32 toward the large inner diameter hole 31. In this regard, since the transmission connection part 12 on the lead screw is gradually inserted from one end of the small inner diameter hole 32 until the end of the lead screw is inserted into the large inner diameter hole 31, the first fastening nut 21 is then placed in the large inner diameter hole 31 and tightened on the lead screw. In this regard, a tapered section 121 is formed on the transmission connection part 12 to adapt to the tapered hole. Here, the cooperation between the tapered hole and the tapered section 121 can, on the one hand, eliminate axial deviation and greatly improve the stability of the lead screw; on the other hand, the tapered cooperation can increase the cooperation area between the lead screw and the assembly hole, thereby improving the bearing capacity of the lead screw.

[0050] Regarding the above situation, it is necessary to add that, first, the axial depth of the large inner diameter hole 31 is not less than the axial length of the first fastening nut 21, so that the first fastening nut 21 can be fastened with the screw without affecting the normal cooperation between the planetary carrier and the planetary gear set.

[0051] Furthermore, when the first fastening nut 21 is secured to the lead screw, a stopper surface 33 is formed at the junction of the large inner diameter hole 31 and the small inner diameter hole 32 of the assembly hole, adapted to abut against one axial end of the first fastening nut 21. The abutment between the first fastening nut 21 and the stopper surface 33, as well as the fit between the tapered hole and the tapered section 121, ensures that the lead screw and the assembly hole do not become axially loose.

[0052] Next, we will explain the bearing assembly, which includes a bearing sleeve 201 mounted on the outside of the frame 4 and a bearing 202 mounted inside the bearing sleeve 201 and used to support the operation of the frame 4. The bearing 202 here can be an angular contact bearing, which is characterized by being able to withstand both radial and axial loads.

[0053] The screw drive assembly needs to withstand unidirectional or bidirectional axial forces during power transmission. To this end, in this embodiment, an annular limiting step 45 is provided on the outer wall of the frame body 4 for abutting against one axial end of the bearing 202, and the outer wall of the frame body 4 is also sleeved with a second fastening nut 22 suitable for abutting against the other axial end of the bearing 202. Under this structure, the limiting step 45 and the second fastening nut 22 cooperate to limit the two axial ends of the bearing 202, allowing the screw drive assembly to withstand axial forces while also bearing bidirectional axial forces.

[0054] In this regard, in order to meet the requirements of the use of the frame body 4 and the second fastening nut 22, the end of the frame body 4 facing away from the large inner diameter hole 31 protrudes from one side end of the bearing sleeve 201; and the outer side wall of the end of the frame body 4 facing away from the large inner diameter hole 31 is provided with an external thread 42 that is adapted to the second fastening nut 22.

[0055] In summary, for the screw transmission assembly of this embodiment, the structure of the planetary frame is optimized so that it can not only achieve reliable cooperation with the screw, but also simultaneously achieve axial limitation of the bearing 202, thereby ensuring the reliability and stability of the screw transmission assembly during operation.

[0056] Example 2:

[0057] See also Figures 1 to 5 As shown, based on the screw drive assembly of Example 1, this embodiment provides a reduction gearbox, comprising: a planetary gear set 6 connected to the planetary carrier of the screw drive assembly of Example 1, an inner ring gear 5 disposed outside the planetary carrier and meshing with the planetary gear set 6, and a motor 9 for driving the planetary gear set 6; wherein the output shaft of the motor 9 is provided with a transmission gear 91 for connecting to the planetary gear set 6. The screw is the core component of the reduction gearbox, and its surface is threaded, and linear motion is achieved by cooperating with the nut 10.

[0058] Based on the above structure, the motor 9 transmits rotational power to the planetary gear set 6 via the transmission gear 91, causing the planetary gear set 6, the planetary carrier, and the lead screw to generate rotational motion. The rotational motion of the lead screw is then converted into linear motion of the nut 10. The linear motion of the nut 10 can drive other components to perform corresponding linear motion or position adjustment.

[0059] What should be explained next is that, first, a disc-shaped body 41 is provided on the side end of the planetary carrier body 4 facing away from the second fastening nut 22; a plurality of gear shafts 43 for supporting the planetary gear set 6 are provided on the disc-shaped body 41; and the outer diameter of the disc-shaped body 41 is smaller than the inner diameter of the inner gear ring 5.

[0060] Secondly, regarding the assembly process of the inner gear ring 5, the inner gear ring 5 partially extends to the outside of the bearing sleeve 201, so that the inner gear ring 5 is fixed to the bearing sleeve 201 via multiple first pins 81. In other words, the bearing sleeve 201 of this embodiment not only plays a role in cooperating with the bearing 202, but also plays a role in fixing the inner gear ring 5.

[0061] Furthermore, in order to better ensure the matching effect between the transmission gear 91 and the planetary gear set 6, the motor 9 of this embodiment is connected to the inner ring gear 5 through a connector. The connector here is roughly T-shaped, and the connector includes a connecting disk 71 and a protrusion 72 formed on one side end face of the connecting disk 71, wherein the protrusion 72 is suitable for being embedded in the inner ring gear 5, and the protrusion 72 and the inner ring gear 5 are connected by a plurality of second pins 82; a through nail hole suitable for matching the screw 83 is provided between the protrusion 72 and the connecting disk 71. In order to avoid interference between the screw 83 and the second pin 82, it is only necessary to design the nail hole in the protrusion 72 to be staggered. Under this structure, for the protrusion 72 extending into the inner ring gear 5, a gasket 300 can be optionally provided between the protrusion 72 and the planetary gear set 6.

[0062] In summary, for the reduction gearbox of this embodiment, the design of the connector allows the motor 9 and the inner ring gear 5 to form a reliable connection, thereby ensuring a reliable and stable matching effect between the transmission gear 91 of the motor 9 and the planetary gear set 6.

[0063] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0064] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0065] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0066] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0067] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0068] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A screw transmission assembly, characterized in that: include: A lead screw comprising a shaft-shaped body and a transmission connection portion provided at one end of the shaft-shaped body; The planetary carrier comprises a frame body and an assembly hole penetrating the frame body for fastening with the transmission connection portion; the transmission connection portion is further provided with a first fastening nut on one end extending into the assembly hole, and a limiting surface is formed in the assembly hole for abutting against one shaft-side end of the first fastening nut; The bearing group includes a bearing sleeve mounted on the outside of a frame body and a bearing mounted inside the bearing sleeve and used to support the operation of the frame body; the outer wall of the frame body is provided with an annular limiting step for abutting against one axial side end of the bearing, and the outer wall of the frame body is also provided with a second fastening nut suitable for abutting against the other axial side end of the bearing.

2. The screw transmission assembly according to claim 1, characterized in that The assembly hole is a T-shaped hole; and The assembly hole includes a large inner diameter hole for accommodating the first fastening nut and a small inner diameter hole suitable for the transmission connection part to pass through; the limiting surface is formed at the junction of the large inner diameter hole and the small inner diameter hole.

3. The screw transmission assembly according to claim 2, characterized in that: The axial depth of the large inner diameter hole is not less than the axial length of the first fastening nut.

4. The screw transmission assembly according to claim 2, characterized in that: The end of the frame body facing away from the large inner diameter hole protrudes from one side end of the bearing sleeve; and An external thread adapted to a second fastening nut is provided on the outer side wall of the end portion of the frame body facing away from the large inner diameter hole.

5. The screw transmission assembly according to any one of claims 2 to 4, characterized in that: The small inner diameter hole is a tapered hole, and the inner diameter of the tapered hole decreases gradually from the small inner diameter hole to the large inner diameter hole; and A tapered section adapted to the tapered hole is formed on the transmission connection portion.

6. The screw transmission assembly according to claim 1, characterized in that The bearing is an angular contact bearing.

7. A reduction gearbox, characterized in that: include: A planetary gear set connected to the planetary carrier of the screw transmission assembly according to any one of claims 1 to 6, an inner ring gear provided on the outside of the planetary carrier and meshing with the planetary gear set, and a motor for driving the planetary gear set; wherein The output shaft of the motor is provided with a transmission gear for connecting to the planetary gear set.

8. The reduction gearbox according to claim 7, characterized in that: The planet carrier is provided with a disc-shaped body at the side end facing away from the second fastening nut; The disc-shaped body is provided with a plurality of gear shafts for supporting the planetary gear set; and The outer diameter of the disc-shaped body is smaller than the inner diameter of the inner gear ring.

9. The reduction gearbox according to claim 7 or 8, characterized in that: The inner gear ring portion extends to the outside of the bearing sleeve, so that the inner gear ring is fixed to the bearing sleeve through a plurality of first pins.

10. The reduction gearbox according to claim 7 or 8, characterized in that: The motor is connected to the inner gear ring through a connector; The connector is adapted to be fastened to the motor via screws; and The connector is formed with a protrusion suitable for being embedded in the inner gear ring; The protrusion is connected to the inner gear ring via a plurality of second pins.

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