External pressure type split worm

Abstract

The application discloses an external pressure type 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 and 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 a worm thread with the first helical teeth. The end of the transmission part away from the fixed part abuts against the elastic part in a pre-compressed state. The transmission part and the fixed part have an adjusting gap generated after the worm thread and the worm gear are connected. In the application, the surface of the second helical teeth close to the fixed part is in contact with the worm gear and generates relative sliding, and then generates an abrasion amount. Due to the elastic force of the elastic part, the second helical teeth always keep close to the worm gear, the effect of eliminating the matching gap caused by abrasion is achieved, the transmission precision is improved, and the service life of the worm is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical transmission, in particular to an external pressure type split worm. BACKGROUND

[0002] Worm gear transmission is a common mechanical transmission method, which realizes rotation through the meshing of worm gear and worm. The meshing surface of worm gear and worm is spiral, so it is also called spiral transmission. Worm gear transmission has the advantages of large transmission ratio, high transmission efficiency and compact structure, and is widely used in various mechanical equipment.

[0003] The principle of worm gear transmission is to realize rotation by using the meshing of worm gear and worm. Worm gear is a disc-shaped gear, and its tooth surface is spiral, called worm tooth. Worm is a long strip-shaped shaft, and its surface is also spiral, called worm thread. When worm gear and worm mesh, due to the spiral shape of worm tooth and worm thread, worm gear will also move axially along worm shaft while rotating, thereby realizing transmission.

[0004] However, when worm and worm gear transmit, the contact surface of worm thread and worm tooth will produce friction. With the growth of time, slight wear will gradually appear, which will reduce the matching degree of worm thread and worm tooth, affecting the transmission accuracy and service life.

[0005] Therefore, people urgently need an external pressure type split worm with high transmission accuracy and long service life. SUMMARY

[0006] The purpose of the present application is to provide an external pressure type split worm to solve the problems existing in the prior art. The elastic force of the elastic member always compresses the second spiral tooth on the transmission member to tightly match the worm tooth, which can eliminate the gap caused by wear and improve the transmission accuracy and service life of the worm.

[0007] To achieve the above purpose, the present application provides the following scheme: the present application provides an external pressure type split worm, which comprises a shaft, a transmission member and an elastic member. The shaft comprises a fixed part and a connecting part. The transmission member is coaxially arranged with the shaft. The transmission member is axially slidably arranged on the connecting part. The fixed part is provided with a first spiral tooth. The transmission member is provided with a second spiral tooth which forms a worm thread with the first spiral tooth. One end of the transmission member away from the fixed part abuts against the elastic member in a pre-compressed state. The transmission member and the fixed part have an adjustment gap generated after the worm thread and the worm tooth are connected.

[0008] Preferably, an end of the transmission member away from the fixed part is provided with a backing plate, an outer side of the backing plate is provided with a hollow cylindrical cover body, a placement space for placing the elastic member is formed between the backing plate and the cylindrical cover body, the backing plate and the cylindrical cover body are coaxially arranged with the connecting part, the backing plate is slidingly arranged on the connecting part, the cylindrical cover body is only axially slidingly arranged on the connecting part, an end of the cylindrical cover body away from the backing plate is provided with a bearing connecting column for connecting a bearing, and an end of the fixed part away from the connecting part is provided with a motor connecting column for connecting a driving motor.

[0009] Preferably, a plurality of racks parallel to the shaft axis are arranged on the connecting part, and a tooth groove matched with the rack is arranged on an inner wall surface of the slidingly connected cylindrical cover body.

[0010] Preferably, an internally hollow guide rod is arranged at an end of the transmission member away from the fixed part, a through hole of the guide rod is matched with the connecting part, the backing plate is coaxially slidingly arranged on the guide rod, an inner bottom wall of the cylindrical cover body is provided with a positioning groove matched with the guide rod, and an end of the guide rod is inserted into the positioning groove.

[0011] Preferably, the elastic member is a spring or an arc-shaped spring steel sheet.

[0012] Preferably, a positioning hole matched with the guide rod is arranged in the middle of the arc-shaped spring steel sheet, and the arc-shaped spring steel sheet is slidingly arranged on the guide rod; and the spring is sleeved on the guide rod.

[0013] Preferably, the arc-shaped spring steel sheet is provided as two, and convex ends of the two arc-shaped spring steel sheets are oppositely arranged.

[0014] Preferably, the connecting part comprises a cylindrical segment arranged close to the fixed part and a tooth-shaped segment arranged away from the fixed part, teeth of the tooth-shaped segment are distributed around the circumference of the shaft, an inner circumferential wall of an end of the transmission member close to the fixed part is matched with the cylindrical segment, and inner circumferential walls of ends of the transmission member away from the fixed part are all matched with the tooth-shaped segment.

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

[0016] In actual work, the face of the second helical tooth close to the fixed part contacts the worm tooth of the worm wheel and produces relative sliding, thereby producing an amount of wear, but the second helical tooth always maintains a close state with the worm tooth due to the elastic force of the elastic member, plays a role in eliminating the fitting clearance caused by wear, improves the transmission precision, and prolongs the service life of the worm, thereby improving the service life of the worm.

[0017] 2、The cylindrical cover body, the elastic member, the gasket and the transmission member can be sequentially disassembled and replaced axially when the transmission member and the elastic member need to be replaced, so that the whole does not need to be replaced, and resources are saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a structural schematic diagram of the external pressure type split worm when it is not installed.

[0020] Figure 2 It is a sectional view of the external pressure type split worm after installation.

[0021] Figure 3 It is a structural schematic diagram of the shaft rod.

[0022] Figure 4 It is a connection structure schematic diagram of the transmission member, the gasket and the arc-shaped spring steel sheet.

[0023] Figure 5 It is a structural schematic diagram of the cylindrical cover body.

[0024] Among them, 1, shaft rod; 2, transmission member; 3, fixed part; 4, connecting part; 5, first helical tooth; 6, second helical tooth; 7, adjustment gap; 8, gasket; 9, cylindrical cover body; 10, bearing connecting column; 11, motor connecting column; 12, guide rod; 13, positioning groove; 14, arc-shaped spring steel sheet; 15, rack. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] The purpose of the present application is to provide an external pressure type split worm to solve the problems in the prior art. The elastic force of the elastic member is used to press the second helical tooth on the transmission member to always tightly match the worm tooth, so that the gap caused by wear can be eliminated, the transmission accuracy and the service life of the worm are improved.

[0027] In order to make the above objectives, 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 drawings and specific embodiments.

[0028] Please refer to as Figures 1-5 shown, a kind of external pressure type split worm, including shaft 1, transmission 2 and elastic element, shaft 1 includes fixed part 3 and connecting part 4, connecting part 4 is cylindrical or rectangular column or other cross section is polygonal column etc., transmission 2 is coaxially arranged with shaft 1, sliding hole is axially set in the middle of transmission 2, transmission 2 is only axially slidably arranged on connecting part 4, transmission 2 is limited by key or tooth in circumferential direction, and does not occur circumferential movement, first helical tooth 5 is arranged on fixed part 3, second helical tooth 6 is arranged on transmission 2 and forms worm thread with first helical tooth 5, the end of transmission 2 away from fixed part 3 is in abutment with elastic element in pre-compression state, there is adjustment gap 7 between transmission 2 and fixed part 3, adjustment gap 7 is generated when worm and worm wheel are connected, in initial state, under the influence of elastic force of elastic element, the end of transmission 2 is in abutment with fixed part 3, at this time, the distance between the two teeth closest to first helical tooth 5 and second helical tooth 6 is less than the pitch of worm tooth, when installing, transmission 2 is first overcome elastic force and opens, transmission 2 and fixed part 3 are pulled apart a certain distance to form adjustment gap 7.

[0029] The end of transmission 2 away from fixed part 3 is provided with backing plate 8, hollow cylindrical cover 9 is arranged outside backing plate 8, and placement space for placing elastic element is formed between cylindrical cover 9 and backing plate 8, backing plate 8 and cylindrical cover 9 are coaxially arranged with connecting part 4, backing plate 8 is slidably arranged on connecting part 4, cylindrical cover 9 is only axially slidably arranged on connecting part 4, bearing connecting column 10 for connecting bearing is arranged at the end of cylindrical cover 9 away from backing plate 8, motor connecting column 11 for connecting driving motor is arranged at the end of fixed part 3 away from connecting part 4, bearing seat where bearing is arranged is used to support cylindrical cover 9 when worm is normally used, to provide a fixed end for elastic element, and when transmission 2 and elastic element need to be replaced, cylindrical cover 9, elastic element, backing plate 8 and transmission 2 can be sequentially disassembled and replaced, damaged parts can be replaced, without the need for overall replacement, saving resources.

[0030] The cylindrical cover 9 and the connecting part 4 can be connected by a key or a tooth, when the tooth is selected, a plurality of toothed grooves 15 parallel to the axis of the shaft 1 are arranged on the connecting part 4, and the inner wall surface of the cylindrical cover 9 connected with the connecting part 4 is provided with toothed grooves matched with the toothed grooves 15; when the key is selected, a plurality of keys corresponding to the position of the cylindrical cover 9 are arranged on the connecting part 4, the keys are in strip shape, and the length direction is parallel to the axis of the connecting part 4, and a plurality of strip grooves are arranged on the inner circumferential wall of the cylindrical cover 9, the strip grooves pass through the axial two ends of the cylindrical cover 9, and the keys slide in the strip grooves.

[0031] The end of the transmission part 2 away from the fixed part 3 is provided with a hollow guide rod 12, the through hole of the guide rod 12 is matched with the connecting part 4, the base plate 8 is coaxially and slidingly arranged on the guide rod 12, that is, the base plate 8 is slidingly arranged on the connecting part 4 through the guide rod 12, the inner bottom wall of the cylindrical cover 9 is provided with a positioning groove 13 matched with the guide rod 12, the end of the guide rod 12 is inserted into the positioning groove 13, and the insertion depth should be greater than the adjusting gap 7. The guide rod 12 provides a guide function for the installation of the base plate 8 and the cylindrical cover 9, and the transmission part, the base plate 8, the elastic part and the cylindrical cover 9 can be assembled and then connected with the connecting part 4.

[0032] The elastic part is a spring or an arc-shaped spring steel sheet 14, when the arc-shaped spring steel sheet 14 is selected, a positioning hole matched with the guide rod 12 is arranged in the middle of the arc-shaped spring steel sheet 14, and the arc-shaped spring steel sheet 14 is slidingly arranged on the guide rod 12. Because the initial outer diameter of the arc-shaped spring steel sheet 14 itself will be smaller than the inner diameter of the placement space considering the deformation of the arc-shaped spring steel sheet 14, the guide rod 12 is used to guide the installation of the arc-shaped spring steel sheet 14 to ensure the central position. When the spring is selected, the spring is sleeved on the guide rod 12, and the guide rod 12 is used to prevent the spring from tilting.

[0033] The arc-shaped spring steel sheet 14 can be provided as two to enhance the elastic force, and the protruding ends of the two arc-shaped spring steel sheets 14 are oppositely arranged.

[0034] When the connection between the connecting part 4 and the transmission rod part is a key connection, a plurality of strip keys corresponding to the position of the transmission part 2 are arranged on the connecting part 4, the length direction of the strip keys is parallel to the axis of the connecting part 4, a plurality of strip grooves are arranged on the inner circumferential wall of the transmission part 2, the strip grooves pass through the axial two ends of the transmission part 2, and the keys slide in the strip grooves; when the connection between the connecting part 4 and the transmission part 2 is a tooth connection, the connecting part 4 includes a toothed section, and the teeth of the toothed section are distributed around the shaft 1. The teeth here can be integrally arranged with the toothed grooves 15 at the corresponding cylindrical cover 9, and the inner circumferential wall of the transmission part 2 is matched with the toothed section.

[0035] The connecting part 4 further comprises a cylindrical section arranged close to the fixed part 3, and the cylindrical section and the tooth-shaped section form the complete connecting part 4, and the cylindrical section is arranged close to the fixed part 3, at this time, the inner circumferential wall of the end of the transmission member 2 close to the fixed part 3 matches the cylindrical section, and the inner circumferential wall of the end away from the fixed part 3 matches the tooth-shaped section.

[0036] In actual use, when the tooth surface of the transmission member 2 is worn, the elastic force of the elastic member can eliminate the fitting gap caused by the wear, so that the teeth of the transmission member 2 are always matched with the teeth of the worm gear, the transmission precision is improved, and the transmission member 2 does not need to be replaced even if it is slightly worn, 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, 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 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 illustrate 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 mode and application range will be changed. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. An externally pressurized 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 volute with the first helical tooth. The end of the transmission component away from the fixed part abuts against the elastic component in a pre-compressed state. There is an adjustment gap between the transmission component and the fixed part after the volute and the helical tooth are engaged. A pad is provided at the end of the transmission component away from the fixed part. A hollow cylindrical cover is provided on the outside of the pad. A placement space for placing the elastic element is formed between the cylindrical cover and the pad. Both the pad and the cylindrical cover are coaxially arranged with the connecting part. The pad is slidably disposed on the connecting part. The cylindrical cover is slidably disposed on the connecting part only along the axial direction. A bearing connecting post for connecting a bearing is provided at the end of the cylindrical cover away from the pad. A motor connecting post for connecting a drive motor is provided at the end of the fixed part away from the connecting part. The connecting part is provided with a plurality of racks parallel to the axis of the shaft, and the inner wall surface of the cylindrical cover that is slidably connected to the connecting part is provided with tooth grooves that match the racks; The transmission component has a hollow guide rod at one end away from the fixed part. The through hole of the guide rod matches the connecting part. The pad is slidably mounted on the guide rod on the same axis. The inner bottom wall of the cylindrical cover has a positioning groove that matches the guide rod. The end of the guide rod is inserted into the positioning groove.

2. The externally pressurized split worm gear according to claim 1, characterized in that, The elastic element is a spring or an arc-shaped steel sheet.

3. The externally pressurized split worm gear according to claim 2, characterized in that, The arc-shaped spring steel sheet has a positioning hole in the middle that matches the guide rod, and the arc-shaped spring steel sheet is slidably mounted on the guide rod; the spring is sleeved on the guide rod.

4. The externally pressurized split worm gear according to claim 2, characterized in that, The arc-shaped spring steel sheet is provided in two parts, and the protruding ends of the two arc-shaped spring steel sheets are arranged opposite each other.

5. The externally pressurized split worm gear according to claim 1, characterized in that, The connecting portion includes a cylindrical segment disposed near the fixed portion and a toothed segment disposed away from the fixed portion. The teeth of the toothed segment are distributed circumferentially around the shaft. The inner peripheral wall of the end of the transmission member near the fixed portion matches the cylindrical segment, and the inner peripheral wall of the end away from the fixed portion matches the toothed segment.

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