Herringbone tooth synchronous pulley and herringbone tooth synchronous belt

Abstract

The utility model relates to the technical field of mechanical transmission, and provides a herringbone tooth synchronous belt wheel and a synchronous belt, the synchronous belt wheel comprises a belt wheel base body, and wheel teeth and tooth grooves which are arranged on the side wall of the belt wheel base body; the assembling holes are formed in the surface of the belt wheel base, the wheel teeth are divided into left-hand teeth and right-hand teeth which are arranged on the two sides in a staggered mode, and a central groove is formed in the portion, between the left-hand teeth and the right-hand teeth, of the belt wheel base; annular grooves are formed in the ends, on the outer sides of the left-hand teeth and the right-hand teeth, of the belt wheel base body, and the belt wheel base body is integrally formed in an injection molding mode. Based on the advantages of transmission of the herringbone tooth synchronous belt, the left-hand teeth and the right-hand teeth which are arranged in a staggered mode can be directly formed on the synchronous belt wheel to achieve the off-tracking prevention effect when the synchronous belt wheel is in meshed transmission with the synchronous belt, and the transmission precision is improved; the belt wheel base body is subjected to integral injection molding, and the synchronous belt is subjected to integral molding, so that the production cost of the synchronous belt wheel and the synchronous belt in the prior art can be greatly reduced and the production procedures can be reduced on the basis of meeting the structural requirements of the driven wheel of the conveying line.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a herringbone gear synchronous belt wheel and a herringbone gear synchronous belt. Background Art

[0002] Synchronous belt transmission involves pulleys and synchronous belts, which is an embedded meshing transmission. However, when the existing synchronous belt pulleys and belts are meshed for transmission, due to installation and manufacturing problems, the belts produce axial movement on the gear teeth. Therefore, the pulleys need flanges or flanges to limit the movement of the belts, which makes the pulley structure complicated. At the same time, the synchronous belts and flanges contact and produce friction, which reduces the service life and transmission efficiency of the belts. Friction will also be accompanied by a certain amount of noise. At the same time, the belts may be transmitted circumferentially in the pulleys, resulting in reduced transmission accuracy. In addition, when traditional synchronous pulleys are used for mechanical transmission, metal materials are widely used for production. Metal processing synchronous pulleys require equipment such as cutting machines, CNC lathes, gear hobbing machines, broaching machines, internal hole grinders, external cylindrical grinders, deburring machines, and riveting machines. Therefore, the production process of synchronous pulleys is numerous, which makes the process complex, the labor and material costs are high, and the production efficiency is low. Utility Model Content

[0003] In order to overcome the above-mentioned technical defects and based on the many advantages of herringbone synchronous belt transmission, the purpose of the utility model is to provide a herringbone synchronous pulley and a herringbone synchronous belt, which is based on a herringbone synchronous pulley with a new tooth shape, so that while keeping the overall structure of the synchronous pulley simple, it has the characteristics of smoother transmission engagement, high transmission accuracy, fewer production processes and low production cost.

[0004] In order to achieve the above object, the utility model provides the following first technical solution:

[0005] The herringbone synchronous pulley comprises a pulley base, and gear teeth and tooth grooves arranged on the side wall of the pulley base; an assembly hole is opened on the surface of the pulley base,

[0006] The gear teeth are divided into left-handed teeth and right-handed teeth staggered on both sides, and the pulley base between the left-handed teeth and the right-handed teeth on both sides is provided with a central groove;

[0007] The pulley base ends outside the left-handed teeth and the right-handed teeth are both provided with annular grooves, and the pulley base is integrally injection-molded.

[0008] Preferably, the radial protrusion on the inner wall of the middle portion of the assembly hole has a boss portion.

[0009] Preferably, a bearing is installed in the inner wall of the assembly hole, and two bearings are provided, which are respectively mounted on the end surfaces of the assembly holes on both sides of the boss portion.

[0010] Preferably, the central groove is arranged in the middle of the side wall of the pulley base, and the outer end surface of the central groove is coaxial and flush with the annular groove.

[0011] Preferably, the normal tooth shape of the tooth groove is composed of a tooth root arc, a tooth side arc, and a tooth top transition arc.

[0012] Preferably, the helix angle of the left-handed teeth and the right-handed teeth is 20°-30°.

[0013] Preferably, the arc center of the tooth side arc is located on the pitch line of the pulley.

[0014] In order to achieve the above object, the utility model also provides the following second technical solution:

[0015] The herringbone synchronous belt comprises a synchronous belt body and belt teeth evenly distributed circumferentially on the inner wall of the synchronous belt body.

[0016] The belt teeth are arranged in two rows that are symmetrical and staggered in the circumferential direction, and mesh with the teeth and tooth grooves of the herringbone synchronous belt wheel in the first technical solution.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] Based on the advantages of herringbone synchronous belt transmission, left-handed and right-handed teeth with staggered settings can be directly formed on the synchronous pulley to achieve an anti-deviation effect when meshing with the synchronous belt for transmission, thereby improving transmission accuracy; and the pulley base is integrally injection molded, combined with the integral molding of the synchronous belt, which not only meets the structural requirements of the driven pulley of the conveyor line, but can also greatly reduce the production cost of the existing synchronous pulleys and synchronous belts and shorten the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 of the utility model;

[0020] Figure 2 This is a schematic diagram of the side wall structure of Example 1 of the utility model;

[0021] Figure 3 This is a schematic diagram of the gear teeth and tooth groove structure of Example 1 of the utility model;

[0022] Figure 4 This is a schematic diagram of the bearing installation of Example 1 of the utility model.

[0023] Figure 5 This is a schematic diagram of the main viewing direction of Example 2 of the utility model.

[0024] Figure 6 It is a partial schematic diagram of embodiment 2 of the utility model which is radially cut and spread out into a plane.

[0025] Reference numerals: pulley base 1 , left-handed tooth 2 , right-handed tooth 3 , tooth groove 4 , center groove 5 , annular groove 6 , assembly hole 7 , boss portion 8 , bearing 9 , synchronous belt body 10 , belt tooth 11 . DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] See also Figure 1-4 , the utility model provides a technical solution in embodiment 1:

[0029] A herringbone tooth synchronous pulley comprises a pulley base 1, and gear teeth and tooth grooves 4 arranged on the side wall of the pulley base; an assembly hole 7 is opened on the surface of the pulley base, the gear teeth are divided into left-handed teeth 2 and right-handed teeth 3 which are staggered on both sides, and the pulley base between the left-handed teeth 2 and the right-handed teeth 3 on both sides is provided with a center groove 5; the pulley base ends on the outer sides of the left-handed teeth and the right-handed teeth are provided with annular grooves 6, the pulley base 1 is integrally injection molded, and the integrally injection molded pulley base can greatly reduce the production cost of the existing metal wheel body, the overall process is simple, and the herringbone toothed pulley has a self-guiding function, the pulley teeth are arranged in a herringbone staggered arrangement, and the noise is reduced by about 20 decibels compared with the spur tooth synchronous pulley transmission of the same specification and size, the transmission power is larger, and the structure is more compact.

[0030] Furthermore, in order to realize the setting of a bearing at the inner end of the assembly hole to connect with the driven shaft, a boss portion 8 is radially protruded on the inner wall in the middle of the assembly hole, and the overall boss portion 8 is arranged in a circular ring at the center of the middle of the assembly hole, separating the two sides of the assembly hole to form a docking installation groove; then, a bearing 9 is installed in the inner wall of the assembly hole, and two bearings are provided, which are respectively matched and mounted on the end faces of the assembly holes on both sides of the boss portion, and the boss portion 8 can be arranged in a split circular ring setting, which can be directly placed in the injection mold and integrally injected with the pulley base 1 after being docked with the bearing and limited, so as to realize the integral connection between the bearing and the pulley base.

[0031] Furthermore, the center groove 5 is arranged in the middle of the side wall of the pulley base, and the outer end face of the center groove is coaxial and flush with the annular groove 6. The annular groove and the center groove are set deeper than the overall gear teeth and tooth grooves, which can effectively avoid the side wear between the synchronous belt pulley and the belt when they are engaged for transmission.

[0032] Furthermore, the normal tooth shape of the tooth groove 4 is composed of a tooth root arc, a tooth side arc, and a tooth top transition arc, wherein the arc center of the tooth side arc is located on the pitch line of the pulley. This arrangement facilitates smoother embedding of the belt teeth into the wheel tooth groove when the tooth groove and the belt teeth in the synchronous belt are engaged for transmission, allowing for a smaller side gap between the pulley tooth groove and the belt teeth, eliminating the polygonal effect and improving transmission accuracy.

[0033] Furthermore, the helix angles of the left-handed teeth 2 and the right-handed teeth 3 are 20°-30°. In the present embodiment, the helix angle is set to 21°-22°, which is a more practical and preferred embodiment. In addition, the radius of the corresponding normal tooth root arc is 0.85-0.95mm, and the radius of the normal tooth side arc is 7.8-8.2mm. Therefore, the radius of the normal tooth top transition arc of the previous month is 0.55-0.65mm, which is a more suitable gear tooth arc setting.

[0034] See also Figure 5 , 6 , a technical solution is provided in the second embodiment of the present utility model:

[0035] A herringbone tooth synchronous belt comprises a synchronous belt body 10 and belt teeth 11 uniformly distributed circumferentially on the inner wall of the synchronous belt body, wherein the belt teeth 11 are arranged in two rows symmetrically and staggered circumferentially, and mesh with the teeth and tooth grooves of the herringbone tooth synchronous belt wheel in the first embodiment to achieve a smooth herringbone tooth meshing transmission effect.

[0036] Therefore, the synchronous pulley group combining the first embodiment and the second embodiment is based on the advantages of the herringbone synchronous belt transmission, and adopts the corresponding combination of the center groove 5 and the annular groove 6, and is matched with the boss portion 8 to connect the bearing limit setting, which can facilitate the quick installation and use of the bearing and the drive shaft, and can directly form the left-handed and right-handed teeth with staggered settings on the synchronous pulley to achieve the anti-deviation effect when meshing with the synchronous belt, thereby improving the transmission accuracy; and adopts the one-piece injection molding of the pulley base, combined with the one-piece molding of the synchronous belt, on the basis of meeting the requirements of the driven wheel structure of the conveyor line, it can greatly reduce the production cost of the existing synchronous pulley and synchronous belt and shorten the production process. In addition to achieving good transmission in various fields, it can also be used as a good anti-deviation transmission structure for the conveyor line body.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A herringbone synchronous pulley, comprising a pulley base, and gear teeth and tooth grooves arranged on the side wall of the pulley base; an assembly hole, which is opened on the surface of the pulley base, characterized in that: The gear teeth are divided into left-handed teeth and right-handed teeth staggered on both sides, and the pulley base between the left-handed teeth and the right-handed teeth on both sides is provided with a central groove; The pulley base ends outside the left-handed teeth and the right-handed teeth are both provided with annular grooves, and the pulley base is integrally injection-molded.

2. The herringbone synchronous pulley according to claim 1, characterized in that: The radial protrusion on the inner wall of the middle part of the assembly hole has a boss portion.

3. The herringbone synchronous pulley according to claim 2, characterized in that: A bearing is arranged in the inner wall of the assembly hole. Two bearings are provided and are respectively matched and mounted on the end faces of the assembly holes at both sides of the boss portion.

4. The herringbone synchronous pulley according to claim 3, characterized in that: The central groove is arranged in the middle of the side wall of the pulley base, and the outer end surface of the central groove is coaxially flush with the annular groove.

5. The herringbone synchronous pulley according to claim 4, characterized in that: The normal tooth shape of the tooth groove is composed of a tooth root arc, a tooth side arc, and a tooth top transition arc.

6. The herringbone synchronous pulley according to claim 5, characterized in that: The helix angles of the left-handed teeth and the right-handed teeth are 20°-30°.

7. The herringbone synchronous pulley according to claim 6, characterized in that: The arc center of the tooth side arc is located on the pitch line of the pulley.

8. A herringbone tooth synchronous belt, comprising a synchronous belt body and belt teeth uniformly distributed circumferentially on the inner wall of the synchronous belt body, characterized in that: The belt teeth are arranged in two rows that are symmetrical and staggered in the circumferential direction, and the teeth and tooth grooves of the herringbone synchronous pulley corresponding to any one of claims 1 to 7 are meshed with each other.

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