Timing chain wheel

Abstract

The utility model relates to the technical field of engine parts, and discloses a timing chain wheel which comprises a wheel body, a positioning shaft and a baffle ring, the outer surface of the wheel body is fixedly connected with chain wheel teeth used for driving a chain, an installation groove is formed in the middle of the outer surface of the wheel body, the inner wall of the installation groove is fixedly connected with a positioning ring used for auxiliary positioning, and the baffle ring is fixedly connected with the positioning shaft. A clamping groove used for blocking and limiting is formed in the inner side wall of the positioning ring. According to the timing chain wheel, through cooperative arrangement of the positioning ring, the blades and the positioning shaft, the positioning shaft and the wheel body can be connected and fixed in the wheel body, meanwhile, in the rotating process of the positioning shaft, the positioning ring can be driven to rotate, so that the wheel body is driven to rotate, and in the case of jamming, the positioning ring can be driven to rotate when the positioning shaft rotates, so that the wheel body is driven to rotate. And the blades are twisted off, so that the positioning shaft idles in the wheel body, the wheel body is prevented from being damaged due to overload, and meanwhile, the engine can be protected.

Description

Technical Field

[0001] The utility model relates to the technical field of engine parts, in particular to a timing sprocket. Background Art

[0002] The function of the timing sprocket is equivalent to the timing belt. It is an important part of the engine's valve train. It ensures the accuracy of the intake and exhaust timing by connecting with the crankshaft and coordinating a certain transmission ratio.

[0003] The function of the timing sprocket is to keep the piston stroke, the opening and closing time of the up and down movement valves, and the ignition sequence time synchronous at all times under the connection of timing when the engine is running. During the operation of the automobile engine, the four processes of intake, compression, explosion, and exhaust occur continuously in the cylinder, and the timing of each step must be coordinated with the movement state and position of the piston to coordinate the intake, exhaust and piston rise and fall. The timing sprocket plays the role of a bridge in the engine, transmitting power to the corresponding parts driven by the crankshaft.

[0004] Chinese patent announcement number CN208348435U discloses a timing sprocket, which belongs to the technical field of engine parts. It solves the problem of low assembly efficiency of existing timing sprockets. The timing sprocket includes a sprocket body and an axial hole arranged in the middle of the sprocket body. The end of one side of the sprocket body is provided with a raised ring. The upper surface of the ring located at the axial hole is provided with an inwardly recessed groove portion. The inner wall of the axial hole is provided with two symmetrically eccentrically arranged keyways. The length A of the keyway is less than the length B of the groove portion. The corners of the keyway are provided with chamfered corners. The utility model has the advantage of high assembly efficiency.

[0005] However, the utility model has the following problems when actually used:

[0006] If the sprocket gets stuck during rotation, over-transmission overload may occur, which may easily lead to broken teeth on the chain or sprocket, and in severe cases may cause engine damage. However, the existing synchronous sprocket does not have good overload protection, and the overall practicality is not high. Utility Model Content

[0007] 1. Technical issues to be solved

[0008] In order to overcome the above-mentioned defects of the prior art, the utility model provides a timing sprocket, which solves the problems in the prior art:

[0009] If the sprocket gets stuck during rotation, over-transmission overload may occur, which may easily lead to broken teeth on the chain or sprocket, and in severe cases may cause engine damage. However, the existing synchronous sprocket does not have good overload protection, and the overall practicality is not high.

[0010] (II) Technical solution

[0011] To achieve the above objectives, the utility model is implemented through the following technical solutions: a timing sprocket, including a wheel body, a positioning shaft and a retaining ring, the outer surface of the wheel body is fixedly connected with sprocket teeth for driving the chain, the middle of the outer surface of the wheel body is provided with a mounting groove, the inner wall of the mounting groove is fixedly connected with a positioning ring for auxiliary positioning, the inner side wall of the positioning ring is provided with a slot for blocking and limiting, the inner wall of the slot is plugged with a blade for overload protection, and the other end of the blade is plugged and engaged with the outer surface of the positioning shaft.

[0012] Optionally, a positioning groove adapted to the blade is formed on the outer surface of the positioning shaft, and an inner wall of the positioning groove is engaged with an end of the blade.

[0013] Optionally, both ends of the positioning shaft are fixedly connected with a chuck, and the outer surface of the chuck is provided with a limiting groove.

[0014] Optionally, a blocking ring is sleeved on the outer surface of the chuck, and a blocking block adapted to the limiting groove is fixedly connected to the inner side wall of the blocking ring.

[0015] Optionally, the outer surface of the clamping block is clamped with the inner wall of the limiting groove, so that the retaining ring rotates synchronously with the chuck.

[0016] Optionally, the end of the chuck is fixedly connected to a limit ring, and the end of the limit ring is provided with a key groove.

[0017] Optionally, a pressure ring for blocking is sleeved on the outer surface of the limiting ring, a fixing seat is fixedly connected to the outer surface of the pressure ring on all sides, and a fixing groove matched with the fixing seat is formed on the outer surface of the wheel body.

[0018] Optionally, a fixing bolt for connection and fixation is threadedly penetrated through the outer surface of the fixing seat, and one end of the fixing bolt passes through the fixing seat and is threadedly connected to the inner bottom wall of the fixing groove, so that the pressure ring is tightly connected to the outer wall of the wheel body.

[0019] (III) Beneficial effects

[0020] The utility model provides a timing sprocket, which has the following beneficial effects:

[0021] The timing sprocket can connect and fix the positioning shaft and the wheel body inside the wheel body through the coordinated arrangement of the positioning ring, the blades and the positioning shaft. At the same time, during the rotation of the positioning shaft, the positioning ring can also be driven to rotate, thereby driving the wheel body to rotate. However, in the event of a jam, the blades can be twisted off when the positioning shaft rotates, so that the positioning shaft can idle inside the wheel body, thereby preventing the wheel body from being damaged due to overload. At the same time, the engine can also be protected. Through the arrangement of the retaining ring, the blades can be blocked after being damaged, thereby preventing the blades from leaking out and causing damage to the engine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall installation structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the installation structure of the retaining ring of the utility model;

[0025] Figure 4 This is a schematic diagram of the explosion structure of the blade of the utility model;

[0026] Figure 5 This is a schematic diagram of the positioning shaft structure of the utility model.

[0027] In the figure: 1. wheel body; 2. sprocket teeth; 3. mounting groove; 4. positioning ring; 5. clamping groove; 6. blade; 7. positioning shaft; 8. positioning groove; 9. chuck; 10. limiting groove; 11. limiting ring; 12. keyway; 13. retaining ring; 14. clamping block; 15. pressure ring; 16. fixing seat; 17. fixing groove; 18. fixing bolt. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model provides a technical solution: a timing sprocket, which is specifically as follows:

[0030] See also Figures 1 to 3 In order to enable the wheel body 1 to drive the chain during operation, a sprocket tooth 2 is provided on the outer wall of the wheel body 1;

[0031] The sprocket teeth 2 are fixedly connected to the outer wall of the wheel body 1, so that when the wheel body 1 rotates, the sprocket teeth 2 are driven to rotate synchronously, thereby driving the chain to drive, thereby ensuring normal transmission of the device.

[0032] See also Figures 1 to 5 In order to prevent the wheel body 1 from being overloaded and affecting the sprocket teeth 2 during operation, blades 6 are provided in the wheel body 1;

[0033] The middle part of the outer surface of the wheel body 1 is provided with a mounting groove 3, and a positioning ring 4 is fixedly connected to the inner wall of the mounting groove 3. A clamping groove 5 is provided on the inner wall of the positioning ring 4, and a blade 6 is inserted into the inner wall of the clamping groove 5. When the positioning ring 4 is installed in the mounting groove 3, the blade 6 can be fixed with the help of the clamping groove 5 provided inside the positioning ring 4, so that the thrust of the blade 6 can be transmitted to the positioning ring 4, and then the wheel body 1 can be driven with the help of the positioning ring 4; the other end of the blade 6 is clamped with the outer surface of the positioning shaft 7, and the surface of the positioning shaft 7 is provided with a positioning groove 8, and the outer surface of the positioning groove 8 is clamped with the end of the blade 6, and then the positioning shaft 7 is installed in the middle part of the positioning ring 4, and at the same time, the power of the positioning shaft 7 is transmitted to the positioning ring 4 with the help of the blade 6, so as to drive the wheel body 1 to rotate; and the arrangement of the blade 6 can ensure that the positioning shaft 7 can be fixed with the help of its own structural strength. In order to stably transmit the positioning ring 4, however, when the wheel body 1 is stuck or the engine has problems, the overload torque can break the blade 6, so that the positioning shaft 7 will idle inside the wheel body 1, thereby avoiding continued power transmission to damage the engine, thereby improving the practicality of the device; and the setting of the blade 6 can not only avoid damage to the wheel body 1 caused by overload by virtue of its own damage, but also make use of the toughness of the blade 6 itself. When the chain vibrates, the elastic force of the blade 6 can offset the vibration, thereby ensuring the generation of noise, further improving the practicality of the device, and the blade 6 is installed between the positioning ring 4 and the positioning shaft 7 in the form of a ring array, and then the direction of the blade 6 can be changed according to the different transmission directions, so that the device is suitable for different usage requirements, further improving the scope of application of the device.

[0034] See also Figures 1 to 3 In order to prevent the blades 6 from scattering outwards and causing secondary damage after breaking, retaining rings 13 are provided on both sides of the wheel body 1;

[0035] The two ends of the positioning shaft 7 are fixedly connected with a chuck 9, and the outer surface of the chuck 9 is sleeved with a retaining ring 13, which can form a barrier between the positioning shaft 7 and the positioning ring 4; a limiting groove 10 is provided on the outer surface of the chuck 9, and the inner wall retaining rod of the retaining ring 13 is connected with a clamping block 14 adapted to the limiting groove 10, and then with the help of the mutual cooperation between the clamping block 14 and the limiting groove 10, the retaining ring 13 is driven to rotate when the positioning shaft 7 drives the chuck 9 to rotate; even after the blade 6 is damaged, the positioning shaft 7 can still drive the retaining ring 13 to rotate, so that the retaining ring 13 can block the damaged blade 6, thereby preventing the broken blade 6 from causing secondary damage to the engine, and at the same time, after the staff removes the retaining ring 13, it is convenient to collect and replace the blade 6.

[0036] See also Figures 1 to 5 In order to drive the positioning shaft 7 and the chuck 9 to rotate, a limiting ring 11 is provided on the surface of the chuck 9;

[0037] The end of the limiting ring 11 is provided with a keyway 12, which makes it easy to install and fix the device; a pressure ring 15 is sleeved on the outer surface of the limiting ring 11, and the pressure ring 15 can block the internal retaining ring 13, thereby ensuring the rotation stability of the retaining ring 13 during rotation; the outer surface of the pressure ring 15 is fixedly connected with a fixing seat 16 all around, and the outer surface of the wheel body 1 is provided with a fixing groove 17 adapted to the fixing seat 16, so that the pressure ring 15 can be fixed to the outer wall of the wheel body 1 with the help of a fixing bolt 18, so that the wheel body 1 and the pressure ring 15 can rotate synchronously, but the pressure ring 15 rotates coaxially with the positioning shaft 7 but is not fixed to each other, so that even after the positioning shaft 7 breaks the blade 6, the pressure ring 15 can still be supported by the limiting ring 11, so as to avoid the displacement of the wheel body 1 after losing the support of the blade 6, thereby avoiding the situation where it falls off and causes secondary damage to the engine;

[0038] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0039] In the utility model, the working steps of the device are as follows:

[0040] First, the positioning ring 4 is installed inside the mounting groove 3 in the wheel body 1 in an interference fit manner, and then the positioning shaft 7 is inserted into the positioning ring 4, and then the blades 6 are installed between the card slot 5 and the positioning groove 8 in a circular array, so that the rotation of the positioning shaft 7 can drive the positioning ring 4 and the wheel body 1 to rotate, and then the retaining ring 13 is clamped into the surface of the chuck 9 with the help of the clamping block 14, and the clamping block 14 is inserted into the limiting groove 10, so that the internal blades 6 can be blocked and protected, and the pressure ring 15 is sleeved on the surface of the limiting ring 11, and the fixing seat 16 can be clamped into the fixing seat 16. The fixing seat 16 and the fixing groove 17 are installed and fixed by means of the fixing bolts 18 to complete the assembly of the device. The device can be installed at a suitable position of the engine. In the event of overload, the blade 6 can be broken by means of the excessive torque of the positioning shaft 7, so that the positioning shaft 7 idles inside the positioning ring 4. When replacing, the staff removes the fixing bolts 18, the pressure ring 15 and the retaining ring 13, and replaces the internal blade 6. If the positioning ring 4 and the positioning shaft 7 are damaged, the designated parts can be replaced separately.

[0041] 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 timing sprocket, comprising a wheel body (1), a positioning shaft (7) and a retaining ring (13), characterized in that: The outer surface of the wheel body (1) is fixedly connected with a sprocket (2) for driving a chain, a mounting groove (3) is provided in the middle of the outer surface of the wheel body (1), a positioning ring (4) for auxiliary positioning is fixedly connected to the inner wall of the mounting groove (3), a clamping groove (5) for blocking and limiting is provided on the inner side wall of the positioning ring (4), a blade (6) for overload protection is inserted into the inner wall of the clamping groove (5), and the other end of the blade (6) is inserted and clamped with the outer surface of the positioning shaft (7).

2. A timing sprocket according to claim 1, characterized in that: The outer surface of the positioning shaft (7) is provided with a positioning groove (8) adapted to the blade (6), and the inner wall of the positioning groove (8) is clamped with the end of the blade (6).

3. A timing sprocket according to claim 1, characterized in that: Both ends of the positioning shaft (7) are fixedly connected to a chuck (9), and a limiting groove (10) is provided on the outer surface of the chuck (9).

4. A timing sprocket according to claim 3, characterized in that: A blocking ring (13) is sleeved on the outer surface of the chuck (9), and a blocking block (14) adapted to the limiting groove (10) is fixedly connected to the inner side wall of the blocking ring (13).

5. A timing sprocket according to claim 4, characterized in that: The outer surface of the clamping block (14) is clamped with the inner wall of the limiting groove (10), so that the retaining ring (13) rotates synchronously with the chuck (9).

6. A timing sprocket according to claim 4, characterized in that: The end of the chuck (9) is fixedly connected to a limiting ring (11), and the end of the limiting ring (11) is provided with a key groove (12).

7. A timing sprocket according to claim 6, characterized in that: The outer surface of the limiting ring (11) is sleeved with a pressure ring (15) for blocking, and the outer surface of the pressure ring (15) is fixedly connected to a fixing seat (16) on all sides, and the outer surface of the wheel body (1) is provided with a fixing groove (17) adapted to the fixing seat (16).

8. A timing sprocket according to claim 7, characterized in that: The outer surface of the fixing seat (16) is threadedly provided with a fixing bolt (18) for connection and fixing. One end of the fixing bolt (18) passes through the fixing seat (16) and is threadedly connected to the inner bottom wall of the fixing groove (17), so that the pressure ring (15) is tightly connected to the outer wall of the wheel body (1).

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