Hidden synchronizing wheel gear transmission anti-loosening mechanism

Abstract

The utility model discloses a hidden synchronizing wheel gear transmission anti-loosening mechanism, which relates to the technical field of synchronizing wheel structures, and comprises a synchronizing wheel, a shaft connecting hole arranged in the middle of the synchronizing wheel, a key chute arranged on the side wall of the shaft connecting hole, and a bolt hole extending from the tooth surface of the synchronizing wheel to the key chute; the connecting key is connected with the key sliding groove and provided with a fastening hole, and the position of the fastening hole is aligned with the position of the plug pin hole. And the fixing pin is in interference connection with the bolt hole and the fastening hole, and the fixing pin is used for fixing the positions of the connecting key and the synchronizing wheel. According to the hidden synchronizing wheel gear transmission anti-loosening mechanism, the connecting key is in interference fit with the key sliding groove through the fixing pin, the position of the connecting key in the synchronizing wheel is relatively fixed, the connecting key can be firmly connected with the position of the shaft body, and therefore the synchronizing wheel can operate more stably and is not prone to loosening. And the interference connection structure is adopted, so that threaded connection looseness caused by vibration is effectively avoided, and the transmission efficiency of the synchronizing wheel can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of synchronous pulley structures, and particularly relates to a concealed synchronous pulley gear transmission anti-loosening mechanism. Background Art

[0002] A synchronous pulley, also known as a timing belt pulley, is a component widely used in mechanical transmission systems. It achieves precise power transmission and synchronous movement by matching with the teeth of a timing belt. When the synchronous pulley is assembled to a drive shaft, it is usually axially positioned by end face screws.

[0003] CN201710875925.4 discloses a high-traction transmission synchronous pulley, which includes a synchronous pulley body, a synchronous pulley retaining ring, and a set screw. Both the synchronous pulley body and the synchronous pulley retaining ring are made of aluminum alloy. The synchronous pulley retaining ring is tightly fitted at both ends of the synchronous pulley body. One end of the synchronous pulley body is integrally formed with a motor connection end. The synchronous belt body is provided with a shaft hole for installing the motor output end, and at least one threaded hole for installing the set screw is provided on the motor connection end.

[0004] Currently, the connection between an existing synchronous pulley and a drive shaft is usually locked and limited by threaded screws. After the synchronous pulley works for a long time or is subjected to vibration, the connection between the screw and the synchronous pulley will gradually loosen, resulting in the loosening and falling off of the synchronous pulley or affecting the transmission accuracy. Content of the Utility Model

[0005] The utility model aims to at least solve the technical problem of "currently, the connection between an existing synchronous pulley and a drive shaft is usually locked and limited by threaded screws. After the synchronous pulley works for a long time or is subjected to vibration, the connection between the screw and the synchronous pulley will gradually loosen, resulting in the loosening and falling off of the synchronous pulley or affecting the transmission accuracy" existing in the prior art. For this purpose, the utility model provides a concealed synchronous pulley gear transmission anti-loosening mechanism, which uses a fixed pin structure to fix the positions of the synchronous pulley and the drive shaft, improves the connection stability of the synchronous pulley, makes the synchronous pulley operate more stably, and has higher transmission efficiency.

[0006] A concealed synchronous pulley gear transmission anti-loosening mechanism according to some embodiments of the utility model includes:

[0007] A synchronous pulley, in which a shaft connection hole is provided in the middle of the synchronous pulley and a key chute is provided on the side wall of the shaft connection hole. The synchronous pulley is provided with a pin hole, and the pin hole extends from the tooth surface of the synchronous pulley to the key chute;

[0008] A connection key, which is connected to the key chute. The connection key is provided with a fastening hole, and the position of the fastening hole is aligned with the position of the pin hole;

[0009] A fixed pin, which is in interference connection with the pin hole and the fastening hole, and the fixed pin is used to fix the positions of the connection key and the synchronous pulley.

[0010] According to some embodiments of the present utility model, the pin hole is provided with a guiding area and an extending area. One end of the extending area communicates with the guiding area, and the other end communicates with the key sliding groove. The aperture of the extending area is smaller than that of the guiding area.

[0011] According to some embodiments of the present utility model, the fixing pin is provided with an abutting portion, an extending portion and a pin portion. The diameter of the abutting portion is equal to the aperture of the guiding area. The diameter of the extending portion is larger than the aperture of the extending area. The diameter of the pin portion is larger than the aperture of the fastening hole. When the fixing pin is inserted into the pin hole, the extending portion and the pin portion are respectively in interference connection with the extending area and the fastening hole.

[0012] According to some embodiments of the present utility model, the diameters of the abutting portion, the extending portion and the pin portion gradually decrease.

[0013] According to some embodiments of the present utility model, the fastening hole of the connecting key is a blind hole structure or a through hole structure.

[0014] According to some embodiments of the present utility model, the width of the connecting key is equal to the width of the key sliding groove.

[0015] According to some embodiments of the present utility model, it includes a main shaft. A key groove is provided in the shaft head area of the main shaft, and the contour of the key groove matches the contour of the connecting key.

[0016] According to some embodiments of the present utility model, the length of the shaft head of the main shaft is not less than the depth of the shaft connection hole of the synchronous pulley.

[0017] According to some embodiments of the present utility model, the pin hole is arranged in the tooth groove area of the synchronous pulley.

[0018] According to some embodiments of the present utility model, a baffle is arranged on the end face of the synchronous pulley, and the diameter of the baffle is larger than the tip diameter of the teeth of the synchronous pulley.

[0019] A hidden type synchronous pulley gear transmission anti-loosening mechanism according to some embodiments of the present utility model has at least the following beneficial effects: The connecting key is in interference connection in the key sliding groove through the fixing pin, so that the position of the connecting key in the synchronous pulley is relatively fixed, and the connecting key can firmly connect the position of the shaft body, so that the synchronous pulley runs more stably and is not easy to loosen. The interference connection structure effectively avoids the loosening of the threaded connection caused by vibration, and can also improve the transmission efficiency of the synchronous pulley.

[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0022] Figure 1 is a three-dimensional schematic diagram of a hidden synchronous pulley gear transmission anti-loosening mechanism according to an embodiment of the present utility model;

[0023] Figure 2 is a first cross-sectional view of a hidden synchronous pulley gear transmission anti-loosening mechanism according to an embodiment of the present utility model;

[0024] Figure 3 is a second cross-sectional view of a hidden synchronous pulley gear transmission anti-loosening mechanism according to an embodiment of the present utility model;

[0025] Figure 4 is an exploded schematic diagram of a hidden synchronous pulley gear transmission anti-loosening mechanism according to an embodiment of the present utility model.

[0026] Reference Numerals:

[0027] Synchronous pulley 100, shaft connection hole 110, key chute 120, pin hole 130, guiding area 131, extended area 132, baffle 140,

[0028] Connecting key 200, fastening hole 210,

[0029] Fixed pin 300, abutting portion 310, extending portion 320, pin portion 330,

[0030] Main shaft 400, keyway 410. Detailed Embodiment

[0031] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0032] In the description of the present utility model, it should be understood that regarding the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, top, bottom, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0035] Next, refer to Figures 1-4 Describe a hidden synchronous pulley gear transmission anti-loosening mechanism according to an embodiment of the present utility model.

[0036] As Figures 1-4 shown, a hidden synchronous pulley gear transmission anti-loosening mechanism includes a synchronous pulley 100, a connection key 200, and a fixing pin 300. Specifically, a shaft connection hole 110 is provided at the central axis of the synchronous pulley 100, and a key sliding groove 120 is provided on the side wall of the shaft connection hole 110. The key sliding groove 120 is recessed on the inner wall of the shaft connection hole 110. The synchronous pulley 100 is further provided with a pin hole 130, and the pin hole 130 extends from the tooth surface of the synchronous pulley 100 to the position of the key sliding groove 120, and the pin hole 130 communicates with the shaft connection hole 110.

[0037] The connection key 200 is connected to the key sliding groove 120, and a fastening hole 210 is provided on the surface of the connection key 200. When the connection key 200 is assembled in place with the key sliding groove 120, the position of the fastening hole 210 is aligned with the position of the pin hole 130, that is, the center of the fastening hole 210 and the center of the pin hole 130 are coaxially arranged.

[0038] The fixing pin 300 is in interference connection with the pin hole 130 and the fastening hole 210. The fixing pin 300 is used to fix the positions of the connection key 200 and the synchronous pulley 100, so that the connection key 200 and the synchronous pulley 100 are stably connected, and the connection key 200 is connected to the shaft body, so that the synchronous pulley 100 can operate stably without loosening.

[0039] The strength of the existing thread locking structure is relatively low, and the connection is achieved by relying on threads and pre-tightening force, which is easy to loosen when subjected to a large load, causing the synchronous wheel 100 to loosen and fall off. In addition, there are tiny gaps in the thread locking structure, which can easily aggravate the damage and failure of the threads under long-term operation, and finally lead to loose assembly, reduce the concentricity of the synchronous wheel 100, and cause it to jump or fall off.

[0040] Compared with the existing threaded locking structure of the synchronous wheel 100, the utility model adopts an interference connection structure of the fixing pin 300. The interference connection structure has the advantages of simple structure and good centering performance, ensuring the concentricity of the connection, which is conducive to improving the transmission torque and axial force of the synchronous wheel 100. The interference connection structure can withstand large axial force, torque and dynamic load, and is suitable for heavy load occasions. The interference connection structure of this embodiment can meet the severe use environment and service life requirements of the synchronous wheel 100.

[0041] It should be noted that the anti-loosening mechanism of the present invention can be applied to synchronous wheel structures, gear structures and any structure using key connection. The present invention does not elaborate on the specific structures of the anti-loosening mechanism. It should be understood that the specific structures of the anti-loosening mechanism can be flexibly changed without departing from the basic concept of the present invention, and should be regarded as within the protection scope defined by the present invention.

[0042] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the latch hole 130 is provided with a guide area 131 and an extension area 132 . One end of the extension area 132 is connected to the guide area 131 , and the other end is connected to the key slot 120 . The aperture of the extension area 132 is smaller than that of the guide area 131 .

[0043] Specifically, the extension area 132 and the guide area 131 of the pin hole 130 form a stepped channel, which can set the maximum insertion depth of the fixing pin 300. There is no need for the staff to measure the installation depth of the fixing pin 300 after installation, which effectively improves the installation efficiency of the fixing pin 300.

[0044] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the fixing pin 300 is provided with an abutment portion 310, an extension portion 320 and a pin portion 330, the diameter of the abutment portion 310 is equal to the aperture of the guide area 131, the diameter of the extension portion 320 is larger than the aperture of the extension area 132, and the diameter of the pin portion 330 is larger than the aperture of the fastening hole 210; when the fixing pin 300 is inserted into the pin hole 130, the extension portion 320 and the pin portion 330 are respectively interference connected with the extension area 132 and the fastening hole 210.

[0045] Specifically, the diameters of the extension portion 320 and the pin portion 330 are about 0.1 mm to 0.8 mm larger than the diameters of the corresponding extension area 132 and the fastening hole 210, ensuring that the interference connection strength of the fixing pin 300 is gradually increased during the installation process, and improving the connection firmness between the fixing pin 300 and the synchronous pulley 100.

[0046] Furthermore, as Figures 2-4 shown, the diameters of the abutting portion 310, the extension portion 320, and the pin portion 330 gradually decrease. In order to gradually drive the fixing pin 300 into the insertion hole 130 and the fastening hole 210, the diameters of different parts of the fixing pin 300 gradually decrease, so that the fixing pin 300 gradually penetrates into the insertion hole 130, improving the interference connection strength.

[0047] In some embodiments of the present invention, as Figure 2 and Figure 4 shown, the fastening hole 210 of the connection key 200 is a blind hole structure or a through hole structure. Specifically, when the blind hole structure is adopted for the fastening hole 210 and the fixing pin 300 is inserted to the bottom of the fastening hole 210, the fixing pin 300 is installed in place and the expected installation strength is achieved. The blind hole structure has certain requirements for the processing accuracy of the components. In other embodiments, a through hole structure can also be adopted. When the fixing pin 300 is inserted into the fastening hole 210, the pressing force value can be set. When the installation pressing force reaches the specified value, the fixing pin 300 is installed in place. The through hole structure does not need to control the depth of the fastening hole 210, reducing the processing difficulty.

[0048] In some embodiments of the present invention, as Figure 4 shown, the width of the connection key 200 is equal to the width of the key chute 120. Specifically, the matching of the width of the connection key 200 and the width of the key chute 120 can reduce the shaking of the connection key 200 in the key chute 120, making the connection more stable.

[0049] In some embodiments of the present invention, as Figure 1 , Figure 2 and Figure 4 shown, it includes a main shaft 400. A key groove 410 is provided in the shaft head area of the main shaft 400, and the contour of the key groove 410 matches the contour of the connection key 200. Specifically, the main shaft 400 and the synchronous pulley 100 are key-connected through the connection key 200, and then the position of the connection key 200 is fixed by the fixing pin 300 to prevent axial slip between the synchronous pulley 100 and the main shaft 400.

[0050] Furthermore, as Figure 2As shown, the length of the shaft head of the main shaft 400 is not less than the depth of the shaft connection hole 110 of the synchronous pulley 100. Specifically, the length of the shaft head of the main shaft 400 is longer than the depth of the shaft connection hole 110, which can ensure that the synchronous pulley 100 is completely installed on the shaft head of the main shaft 400.

[0051] In some embodiments of the present utility model, as Figures 1-4 shown, the pin hole 130 is provided in the tooth groove area of the synchronous pulley 100. Specifically, the pin hole 130 penetrates from the tooth groove area to the position of the shaft connection hole 110, which can reduce the transmission influence on the transmission connection between the transmission belt and the synchronous pulley 100.

[0052] In some embodiments of the present utility model, as Figures 1-4 shown, a baffle 140 is provided on the end face of the synchronous pulley 100, and the diameter of the baffle 140 is larger than the tip diameter of the teeth of the synchronous pulley 100. Specifically, the baffle 140 is integrally formed with the synchronous pulley 100, which can prevent the transmission belt from shifting on the synchronous pulley 100 during the transmission process between the synchronous pulley 100 and the transmission belt, and effectively prevent the transmission belt from falling off.

[0053] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A hidden synchronous wheel gear transmission anti-loosening mechanism, characterized in that: include: A synchronous wheel (100), wherein a shaft connection hole (110) and a keyway (120) are arranged in the middle of the synchronous wheel (100), and the synchronous wheel (100) is provided with a latch hole (130), and the latch hole (130) extends from the tooth surface of the synchronous wheel (100) to the keyway (120); A connecting key (200) connected to the key slide groove (120), the connecting key (200) being provided with a fastening hole (210), the position of the fastening hole (210) being aligned with the position of the latch hole (130); A fixing pin (300) is interference-connected with the pin hole (130) and the fastening hole (210), and the fixing pin (300) is used to fix the positions of the connecting key (200) and the synchronous wheel (100).

2. A hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 1, characterized in that: The latch hole (130) is provided with a guide area (131) and an extension area (132); one end of the extension area (132) is connected to the guide area (131), and the other end is connected to the key slide groove (120); the hole diameter of the extension area (132) is smaller than the hole diameter of the guide area (131).

3. A hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 2, characterized in that: The fixing pin (300) is provided with an abutment portion (310), an extension portion (320) and a pin portion (330); the diameter of the abutment portion (310) is equal to the hole diameter of the guide area (131); the diameter of the extension portion (320) is larger than the hole diameter of the extension area (132); and the diameter of the pin portion (330) is larger than the hole diameter of the fastening hole (210); when the fixing pin (300) is inserted into the pin insertion hole (130), the extension portion (320) and the pin portion (330) are respectively interference-connected with the extension area (132) and the fastening hole (210).

4. A hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 3, characterized in that: The diameters of the abutting portion (310), the extending portion (320) and the pin portion (330) gradually decrease.

5. The hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 1 is characterized in that: The fastening hole (210) of the connecting key (200) is a blind hole structure or a through hole structure.

6. A hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 5, characterized in that: The width of the connecting key (200) is equal to the width of the key sliding groove (120).

7. The hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 1, characterized in that: It comprises a main shaft (400), wherein a keyway (410) is arranged in a shaft head region of the main shaft (400), and the contour of the keyway (410) matches the contour of the connecting key (200).

8. A hidden synchronous wheel gear transmission anti-loosening mechanism according to claim 7, characterized in that: The shaft head length of the main shaft (400) is not less than the depth of the shaft connection hole (110) of the synchronous wheel (100).

9. A hidden synchronous wheel gear transmission anti-loosening mechanism according to any one of claims 1 to 8, characterized in that: The latch hole (130) is arranged in the tooth groove area of ​​the synchronous wheel (100).

10. A hidden synchronous wheel gear transmission anti-loosening mechanism according to any one of claims 1 to 8, characterized in that: The end surface of the synchronous wheel (100) is provided with a baffle (140), and the diameter of the baffle (140) is larger than the tooth top diameter of the synchronous wheel (100).

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