A kind of inner pull type split worm

Abstract

The application discloses an inner-pulling split worm, and relates to the technical field of mechanical transmission, which comprises a shaft rod, a transmission part and an elastic part. The shaft rod comprises a fixed part and a connecting part. The transmission part is coaxially arranged with the shaft rod. The transmission part is axially slidably arranged on the connecting part. The fixed part is provided with first helical teeth. The transmission part is provided with second helical teeth which form worm gears with the first helical teeth. The elastic part in a stretched state is arranged between the transmission part and the fixed part. One end of the elastic part is fixedly connected with the transmission part, and the other end is fixedly connected with the fixed part. An adjusting gap is formed between the transmission part and the fixed part after the worm thread and the worm gear are connected. In the application, the transmission part is subjected to the tension of the elastic part during actual work. The second helical teeth always keep close contact with the worm gear, thereby eliminating the matching gap caused by abrasion, improving the transmission precision, prolonging the service life of the worm, and improving the service life of the worm.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and in particular to an internal pull-type split worm gear. Background Technology

[0002] The worm gear mechanism evolved from the staggered-axis helical cylindrical gear mechanism and is a special type of gear mechanism used to transmit motion between two staggered shafts. Its working principle is as follows: rotation is achieved by the meshing of the worm wheel and the worm. The worm wheel is a disc-shaped gear with helical teeth, called worm teeth. The worm is a long, strip-shaped shaft with a helical surface, called worm grooves. When the worm wheel and the worm mesh, due to the helical shape of the worm teeth and worm grooves, the worm wheel moves along the worm's axial direction while rotating, thus achieving transmission.

[0003] However, when the worm and worm wheel are transmitting power, friction will occur on the contact surface between the worm groove and the worm tooth. Over time, slight wear will gradually occur, reducing the fit between the worm groove and the worm tooth, which will affect the transmission accuracy and service life.

[0004] Therefore, there is an urgent need for an internal pull-type split worm gear with high transmission accuracy and long service life. Summary of the Invention

[0005] The purpose of this invention is to provide an internally pulled split worm gear to solve the problems existing in the prior art. By using the tension of the elastic element to pull the second helical tooth on the transmission component, it can always be in close contact with the worm tooth, thereby eliminating the gap caused by wear, improving the transmission accuracy and the service life of the worm gear.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides an internally pulled split worm gear, including a shaft, a transmission component, and an elastic component. The shaft includes a fixed part and a connecting part. The transmission component is coaxially arranged with the shaft and is axially slidably disposed on the connecting part. The fixed part is provided with a first helical tooth, and the transmission component is provided with a second helical tooth that forms a worm gear with the first helical tooth for worm wheel transmission. The elastic component, which is in a stretched state, is disposed between the transmission component and the fixed part. One end of the elastic component is fixedly connected to the transmission component, and the other end is fixedly connected to the fixed part. An adjustment gap is generated between the transmission component and the fixed part after the worm gear and worm teeth are engaged.

[0007] Preferably, the elastic element is a spring or an arc-shaped spring steel sheet.

[0008] Preferably, the end of the transmission member near the fixed part is provided with a receiving groove for accommodating the elastic member, and one end of the elastic member is fixedly connected to the inner bottom wall of the receiving groove.

[0009] Preferably, the inner bottom wall of the accommodating groove is provided with a guide cylinder, the inner diameter of the guide cylinder matches the outer diameter of the connecting part, the fixed part is provided with an annular groove matching the guide cylinder at the position corresponding to the guide cylinder, the guide cylinder is inserted into the annular groove, the distance between the end of the guide cylinder and the inner bottom wall of the annular groove is not less than the adjusting gap, the spring is sleeved on the guide cylinder, or the middle part of the arc-shaped spring steel sheet is provided with a positioning hole matching the guide cylinder, and the arc-shaped spring steel sheet is slidingly arranged on the guide cylinder.

[0010] Preferably, the guide cylinder is integrally arranged with the transmission part.

[0011] Preferably, the transmission part is provided with a positioning part away from the fixed part, the middle part of the positioning part is provided with a mounting hole matching the connecting part, the positioning part is slidingly arranged on the connecting part in the axial direction only, the end of the fixed part away from the transmission part is provided with a motor connecting column for connecting a driving motor, and the end of the positioning part away from the transmission part is provided with a bearing connecting column for connecting a bearing.

[0012] Preferably, one end of the positioning part close to the transmission part is provided with a positioning cylinder, the inner diameter of the positioning cylinder matches the outer diameter of the connecting part, the end of the transmission part close to the positioning part is provided with a positioning groove, the inner diameter of the positioning groove matches the outer diameter of the positioning cylinder, and the positioning cylinder is slidingly arranged in the positioning groove.

[0013] Preferably, the positioning cylinder is integrally arranged with the positioning part.

[0014] Preferably, a plurality of racks parallel to the axis of the connecting part are arranged on the connecting part, and a tooth groove matching the rack is arranged on the inner wall surface of the transmission part and the positioning part.

[0015] The present application has the following technical effects relative to the prior art:

[0016] In the present application, in actual work, the face of the second spiral tooth close to the fixed part is in contact with the worm tooth of the worm wheel and produces relative sliding, thereby producing an amount of wear, but the second spiral tooth always maintains a close state with the worm tooth due to the pulling force of the elastic part, thereby eliminating the fitting gap caused by wear, improving the transmission precision, and prolonging the service life of the worm, and improving the service life of the worm. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 The structure schematic diagram of the inner pull type split worm of the present application is shown in the figure.

[0019] Figure 2 The structure schematic diagram of the inner shaft of the present application is shown in the figure.

[0020] Figure 3 The sectional view of the present application when not assembled with the worm tooth is shown in the figure.

[0021] Figure 4 The sectional view of the present application after assembled with the worm tooth is shown in the figure.

[0022] Wherein, 1, shaft; 2, transmission part; 3, fixed part; 4, connecting part; 5, first helical tooth; 6, second helical tooth; 7, adjustment gap; 8, arc spring steel sheet; 9, containing groove; 10, guide cylinder; 11, annular groove; 12, positioning part; 13, motor connecting column; 14, bearing connecting column; 15, rack; 16, positioning cylinder; 17, positioning groove. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0024] The purpose of the present application is to provide an inner pull type split worm to solve the problems in the prior art, and the second helical tooth on the transmission part is always closely matched with the worm tooth by the pulling force of the elastic part, so that the gap caused by wear can be eliminated, the transmission accuracy and the service life of the worm are improved.

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Please refer to the accompanying drawings as follows Figures 1-4As shown, an inner pull type split worm is provided, comprising a shaft 1, a transmission member 2 and an elastic member, the shaft 1 comprises a fixed part 3 and a connecting part 4, the connecting part 4 is a cylindrical column or a rectangular column or other column with polygonal cross section, the transmission member 2 is coaxially arranged on the shaft 1, the transmission member 2 is axially arranged on the connecting part 4, the transmission member 2 is limited in the circumferential direction by a key or a tooth and cannot move in the circumferential direction, the fixed part 3 is provided with a first helical tooth 5, the transmission member 2 is provided with a second helical tooth 6 which forms a worm gear with the first helical tooth 5, the transmission member 2 and the fixed part 3 are provided with an elastic member in a stretched state, one end of the elastic member is fixedly connected with the transmission member 2, the other end is fixedly connected with the fixed part 3, the transmission member 2 and the fixed part 3 have an adjusting gap 7, the adjusting gap 7 is generated when the worm and the worm wheel are connected, in the initial state, the end of the transmission member 2 abuts against the fixed part 3 under the influence of the elastic force of the elastic member, at this time, the distance between the two teeth closest to the first helical tooth 5 and the second helical tooth 6 is smaller than the pitch of the worm gear, when installed, the transmission member 2 is first opened against the elastic force under the influence of the inclined surface of the worm gear, and the transmission member 2 and the fixed part 3 are pulled apart to form the adjusting gap 7.

[0027] The provision of the elastic force of the elastic member should not damage the oil film formed by the lubricating oil between the transmission member 2 and the worm wheel.

[0028] The elastic member is a spring or an arc-shaped spring steel sheet 8, when the arc-shaped spring steel sheet 8 is selected, two arc-shaped spring steel sheets 8 can be selected as the elastic member, the convex ends of the two arc-shaped spring steel sheets 8 are welded together or integrally formed, and the opposite ends of the two arc-shaped spring steel sheets 8 are respectively welded to the fixed part 3 and the transmission member 2, so as to improve the pulling force on the transmission member 2.

[0029] The end of the transmission member 2 close to the fixed part 3 is provided with a containing groove 9 for containing the elastic member, one end of the elastic member is fixedly connected with the inner bottom wall of the containing groove 9, so as to reduce the influence of the arrangement of the elastic member on the size of the gap between the transmission member 2 and the fixed part 3, and to help shorten the gap between the transmission member 2 and the fixed part 3, so as to adapt to more pitch worm gears and improve the application range.

[0030] The inner bottom wall of the accommodating groove 9 is provided with a guide cylinder 10, the inner diameter of the guide cylinder 10 matches the outer diameter of the connecting part 4, the fixed part 3 is provided with an annular groove 11 which matches the guide cylinder 10 at the position corresponding to the guide cylinder 10, the guide cylinder 10 is inserted into the annular groove 11, the distance between the end of the guide cylinder 10 and the inner bottom wall of the annular groove 11 is not less than the adjusting gap 7 when the worm gear is normally installed, so that the guide cylinder 10 can be completely inserted into the annular groove 11 in the non-installed state, the guide cylinder 10 and the annular groove 11 can guide the movement of the transmission part 2 and improve the movement accuracy, the spring is sleeved on the guide cylinder 10, the spring is prevented from tilting through the guide cylinder 10, or a positioning hole which matches the guide cylinder 10 is formed in the middle of the arc-shaped spring steel sheet 8, the arc-shaped spring steel sheet 8 is slidingly arranged on the guide cylinder 10, considering the deformation of the arc-shaped spring steel sheet 8, the initial outer diameter of the arc-shaped spring steel sheet 8 is smaller than the inner diameter of the accommodating groove 9, in order to ensure the central position of the arc-shaped spring steel sheet 8, the arc-shaped spring steel sheet 8 is guided and installed through the guide cylinder 10.

[0031] The transmission part 2 is provided with a positioning part 12 away from the fixed part 3, the positioning part 12 is provided with an installation hole which matches the connecting part 4 in the middle, the positioning part 12 is slidingly arranged on the connecting part 4 in the axial direction, the positioning part 12 is also fixed in the circumferential direction by using a key or a tooth, the end of the fixed part 3 away from the transmission part 2 is provided with a motor connecting column 13 which is used for connecting a driving motor, the end of the positioning part 12 away from the transmission part 2 is provided with a bearing connecting column 14 which is used for connecting a bearing, a fixed base where the driving motor is located provides a fixed end for the elastic part when the worm is normally used, so that the elastic part can only pull the transmission part 2 to move, the bearing seat where the bearing is located fixes the position of the positioning part 12, prevents the transmission part 2 from being pulled out and avoids the problem of loud noise caused by the shaking of the positioning part 12, in addition, the axial sliding arrangement of the positioning part 12 makes it possible to pull out and replace the positioning part 12 after the bearing is disassembled, and the elastic part and the transmission part 2 can be disassembled by dismounting the fixed connection between the elastic part and the fixed part 3, so that the whole worm is modularly arranged and the damaged parts can be replaced individually.

[0032] When the transmission part 2 and the positioning part 12 use a key as the circumferential positioning, a plurality of strip-shaped keys are arranged on the connecting part 4 at the positions corresponding to the transmission part 2 and the positioning part 12, the length direction of the keys is parallel to the axis of the connecting part 4, a plurality of strip-shaped grooves which match the keys are arranged on the inner circumferential wall of the transmission part 2 and the positioning part 12, the strip-shaped grooves penetrate the axial two ends of the transmission part 2 and the positioning part 12, and the keys slide in the strip-shaped grooves; when the transmission part 2 and the positioning part 12 use a tooth as the circumferential positioning, a plurality of racks 15 which are parallel to the axis of the connecting part 4 are arranged on the connecting part 4, and a plurality of tooth grooves which match the racks 15 are arranged on the inner wall surfaces of the transmission part 2 and the positioning part 12, the tooth grooves also penetrate the axial two ends of the transmission part 2 and the positioning part 12.

[0033] The positioning member 12 is provided with a positioning cylinder 16 near one end of the transmission member 2, the inner diameter of the positioning cylinder 16 matches the outer diameter of the connecting part 4, the transmission member 2 is provided with a positioning groove 17 near the end of the positioning member 12, the inner diameter of the positioning groove 17 matches the outer diameter of the positioning cylinder 16, the positioning cylinder 16 is slidingly arranged in the positioning groove 17, the positioning cylinder 16 and the positioning groove 17 can provide guidance for the installation of the transmission member 2 and the positioning member 12, and improve the installation precision.

[0034] In order to improve the structural strength, the positioning cylinder 16 is integrally arranged with the positioning member 12, and the guide cylinder 10 is integrally arranged with the transmission member 2.

[0035] The inner peripheral wall of the positioning cylinder 16 and the guide cylinder 10 can also be provided with a gear slot or a strip-shaped groove, which is matched with the gear rack 15 or the key arranged on the connecting part 4 to realize axial sliding.

[0036] In actual use, when the tooth surface of the transmission member 2 is worn, the transmission member 2 can be subjected to the tension of the elastic member, the fitting gap caused by wear can be eliminated, the teeth of the transmission member 2 can be always matched with the teeth of the worm gear, the transmission precision can be improved, the transmission member 2 does not need to be replaced even if slight wear occurs, and the service life is improved.

[0037] The adaptive changes according to actual needs are within the protection scope of the present application.

[0038] It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0039] In the present application, specific examples are applied to describe the principles and implementation modes of the present application, and the above embodiment descriptions are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. An internal pull-type split worm gear, characterized in that, The device includes a shaft, a transmission component, and an elastic component. The shaft includes a fixed part and a connecting part. The transmission component is coaxially arranged with the shaft and is axially slidable only on the connecting part. The fixed part is provided with a first helical tooth, and the transmission component is provided with a second helical tooth that forms a worm gear with the first helical tooth for worm gear transmission. An elastic component in a stretched state is provided between the transmission component and the fixed part. One end of the elastic component is fixedly connected to the transmission component, and the other end is fixedly connected to the fixed part. An adjustment gap is formed between the transmission component and the fixed part after the worm gear and worm teeth are engaged. The elastic element is a spring or an arc-shaped spring steel sheet; The end of the transmission member near the fixed part is provided with a receiving groove for accommodating the elastic member, and one end of the elastic member is fixedly connected to the inner bottom wall of the receiving groove; a positioning member is provided on the side of the transmission member away from the fixed part.

2. The internal pull-type split worm gear according to claim 1, characterized in that, The inner bottom wall of the receiving groove is provided with a guide cylinder, the inner diameter of the guide cylinder is matched with the outer diameter of the connecting part, the fixing part is provided with an annular groove matching the guide cylinder at the position of the guide cylinder, the guide cylinder is inserted into the annular groove, the distance between the end of the guide cylinder and the inner bottom wall of the annular groove is not less than the adjustment gap, the spring is sleeved on the guide cylinder, or the arc-shaped spring steel sheet is provided with a positioning hole matching the guide cylinder in the middle, and the arc-shaped spring steel sheet is slidably disposed on the guide cylinder.

3. The pull-in type split worm gear according to claim 2, characterized in that, The guide cylinder is integrally formed with the transmission component.

4. The internal pull-type split worm gear according to claim 1, characterized in that, The positioning member has a mounting hole in the middle that matches the connecting part. The positioning member is slidably mounted on the connecting part only along the axial direction. The end of the fixing part away from the transmission member is provided with a motor connecting post for connecting the drive motor. The end of the positioning member away from the transmission member is provided with a bearing connecting post for connecting the bearing.

5. The pull-in type split worm gear according to claim 4, characterized in that, The positioning member has a positioning cylinder at one end near the transmission member. The inner diameter of the positioning cylinder matches the outer diameter of the connecting part. The transmission member has a positioning groove at the end near the positioning member. The inner diameter of the positioning groove matches the outer diameter of the positioning cylinder. The positioning cylinder is slidably disposed in the positioning groove.

6. The pull-in type split worm gear according to claim 5, characterized in that, The positioning cylinder is integrally formed with the positioning component.

7. The internal pull-type split worm gear according to claim 4, characterized in that, The connecting part is provided with a plurality of racks parallel to the axis of the connecting part, and the inner wall surfaces of the transmission component and the positioning component are provided with tooth grooves that match the racks.

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