Engine with high-precision valve mechanism and motorcycle

Abstract

The engine with the high-precision valve mechanism comprises a crankshaft box body, a crankshaft and the valve mechanism capable of being driven by the crankshaft, the valve mechanism comprises a timing driving wheel, a timing driven wheel and a cam shaft, and the timing driven wheel is provided with a plurality of kidney-shaped holes evenly distributed in the circumferential direction. The mounting position of the timing driven wheel and the camshaft in the circumferential direction is adjustable; the crankshaft is provided with a primary driving tooth used for outputting power, the primary driving tooth is provided with a timing mark, an observation hole position used for being matched with the timing mark is further arranged on a crankshaft box body, and the timing position of the crankshaft is judged by judging whether the timing mark coincides with the observation hole position or not. The timing gear kidney-shaped hole structure is designed, the timing positioning mode of a valve mechanism is optimized, errors caused by timing gear assembling are eliminated through the kidney-shaped hole, timing of a crankshaft, a cam shaft and a valve is more accurate, and the engine assembling precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of engine valve train mechanisms, and in particular to an engine with a high-precision valve train mechanism. Background Technology

[0002] The timing positioning method for the valve train of existing multi-cylinder motorcycle engines generally involves first positioning the crankshaft timing, then positioning the timing driven pulley via the timing chain (or belt), and finally positioning the camshaft. The conventional operation is to first align the timing marks on the crankcase and crankshaft (or magnets and other components), then roughly position the camshaft in the timing position, and then install the timing driven pulley, straightening the tight end of the timing chain (or belt). At this point, the intake and exhaust timing marks on the intake and exhaust timing driven pulleys should be as parallel as possible to the cylinder head cover mounting surface (visually, the position with the smallest angle between the marks and the plane). The camshaft angle is then adjusted by rotation, and the camshaft timing is positioned through the timing driven pulley mounting holes (usually regular round holes). During this process, the timing chain (or belt) is in a slack state. This method is simple to operate, but it has the following disadvantages:

[0003] 1. Difficult to control: The camshaft is first positioned by the crankshaft, and then the timing driven pulley is positioned by the timing chain (or belt) (the tight end of the chain is straightened) to make its marking line as parallel as possible to the cylinder head plane. Finally, the camshaft angle is indirectly positioned by the timing driven pulley mounting hole. The entire dimensional chain has a large error and is difficult to control.

[0004] 2. Large phase error: In the existing assembly process, the timing chain (or belt) is always in a slack state. When the tensioner works, the chain will be deformed and stretched under force, which will further pull the camshaft to rotate and deviate, resulting in a further deviation between the theoretical installation angle and the actual installation angle of the cam, resulting in valve timing phase error.

[0005] Given the drawbacks of the above-mentioned valve train structure, there is an urgent need to develop an engine and motorcycle with a high-precision valve train. This involves designing a timing gear with a waist-shaped hole structure and optimizing the timing positioning method of the valve train. By eliminating the errors caused by assembling the timing gear through the waist-shaped hole, the timing of the crankshaft, camshaft, and valves can be made more precise, and the valve opening and closing times can be more in line with the theoretical design, thereby improving the engine assembly accuracy and performance consistency. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide an engine and motorcycle with a high-precision valve train mechanism, design a timing gear waist-shaped hole structure, and optimize the timing positioning method of the valve train mechanism. By eliminating the error caused by the assembly of the timing gear through the waist-shaped hole, the timing relationship between the crankshaft, camshaft, and valves is made more accurate, the valve opening and closing time is more in line with the theoretical design, and the engine assembly accuracy is improved.

[0007] This utility model discloses an engine with a high-precision valve train, comprising a crankcase, a crankshaft, and a valve train that can be driven by the crankshaft. The valve train includes a timing drive wheel, a timing driven wheel, and a camshaft. The timing driven wheel is driven and mounted on the camshaft, and its mounting position relative to the camshaft is adjustable in the circumferential direction.

[0008] Furthermore, the timing driven wheel is provided with several evenly distributed waist-shaped holes along the circumference, so that the timing driven wheel and the camshaft mounting position are adjustable in the circumference direction.

[0009] Furthermore, the timing driven wheel is also provided with an intake mark and an exhaust mark for determining the timing position of the timing driven wheel, and the intake mark and the exhaust mark have the same diameter.

[0010] Furthermore, the intake and exhaust markings are engraved lines on the same diameter.

[0011] Furthermore, the crankshaft is provided with a primary drive gear for outputting power. The primary drive gear is provided with a timing mark. The crankshaft housing is also provided with an observation hole for matching the timing mark. The timing position of the crankshaft is determined by whether the timing mark coincides with the observation hole.

[0012] Furthermore, the timing mark is a timing calibration hole opened in the primary drive gear.

[0013] Furthermore, the timing drive gear is provided with an auxiliary timing mark, which corresponds radially to the timing mark of the primary drive gear.

[0014] Furthermore, it also includes a camshaft flat groove, which works in conjunction with the camshaft flat groove for camshaft timing positioning.

[0015] A motorcycle equipped with an engine having a high-precision valve train as described in any of the above descriptions.

[0016] The beneficial effects of this utility model are as follows: This utility model provides an engine and motorcycle with a high-precision valve train mechanism. By positioning the relative angle between the crankshaft and camshaft using tooling, and by using a waist-shaped hole to install the timing driven wheel, assembly errors in the intermediate transmission process from the crankshaft to the camshaft are eliminated. At the same time, the tensioner is released during assembly, allowing the chain to be in a taut state, so that the assembly is consistent with the actual working state, further reducing the timing error and improving the valve phase accuracy, resulting in higher engine assembly precision, better consistency, and superior performance. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure at point A of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure at point B of this utility model. Detailed Implementation

[0022] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 2 This is a top view of the present invention. Figure 3 This is a schematic diagram of the structure at point A of this utility model. Figure 4 The diagram shows the structure at point B of this utility model. As shown, this embodiment of the engine with a high-precision valve train includes a crankcase, a crankshaft, and a valve train driven by the crankshaft. The valve train includes a timing drive 5, a timing driven 2, and a camshaft 3. The timing driven 2 is driven and mounted on the camshaft 3, and its position relative to the camshaft 3 is adjustable in the circumferential direction. As shown, it includes a crankcase, a crankshaft, and a valve train driven by the crankshaft. The valve train includes a timing drive 5, a timing driven 2, a camshaft 3, a timing chain 1, and a tensioner 4. The timing driven wheel 2 is driven and installed on the camshaft 3. The installation position of the timing driven wheel 2 relative to the camshaft 3 is adjustable in the circumferential direction. After the valve train is installed and the timing chain 1 is tensioned by the tensioner 4, the timing driven wheel 2 bolt is finally tightened. Since the installation position of the timing driven wheel 2 relative to the camshaft 3 is adjustable in the circumferential direction, it can compensate for the deformation error and machining dimension error after the timing chain 1 is tensioned and eliminate the angular error caused by the assembly of the timing gear. This makes the timing of the crankshaft, camshaft 3 and valves more accurate, and the valve opening and closing time more in line with the theoretical design, improving the engine assembly accuracy and performance consistency.

[0023] In this embodiment, the timing driven wheel 2 is provided with several evenly distributed waist-shaped holes 201 along the circumferential direction, so that the timing driven wheel 2 and the camshaft 3 are adjustable in the circumferential direction. As shown in the figure, in order to realize the adjustable installation position of the timing driven wheel 2 and the camshaft 3 in the circumferential direction, the timing drive wheel 2 is provided with several evenly distributed waist-shaped hole structures along the circumferential direction. After the valve train mechanism is installed, and the timing chain 1 is tensioned by the tensioner 4, the timing driven wheel 2 will rotate slightly. Due to the design of the waist-shaped holes 201, the timing driven wheel 2 can be accurately assembled onto the camshaft 3 after slight rotation. This eliminates the deformation error and machining size error after the timing chain 1 is tensioned, and eliminates the angle error caused by the assembly of the timing gear. Finally, the timing driven wheel 2 bolts are tightened.

[0024] In this embodiment, the timing driven wheel 2 is further provided with an intake mark 202 and an exhaust mark 203 for determining the timing position of the timing driven wheel 2. The intake mark 202 and the exhaust mark 203 have the same diameter. As shown in the figure, the wheel surface of the timing driven wheel 2 is also provided with an intake mark 202 for determining the intake timing position of the camshaft 3 and an exhaust mark 203 for determining the exhaust timing position of the camshaft 3. The intake mark 202 and the exhaust mark 203 are on the same diameter of the timing driven wheel 2. When the intake mark 202 and the exhaust mark 203 are on the same horizontal line, it can be determined that the camshaft 3 is in the timing position.

[0025] In this embodiment, the intake mark 202 and the exhaust mark 203 are engraved lines on the same diameter; as shown in the figure, the intake mark 202 and the exhaust mark 203 are engraved lines on the same diameter of the timing driven wheel 2. The intake mark 202 and the exhaust mark 203 can also be marked by a circular hole or other marking method, which will not be described in detail here.

[0026] In this embodiment, the crankshaft is provided with a primary drive gear for outputting power. The primary drive gear is provided with a timing mark 7. The crankshaft housing is also provided with an observation hole 8 for matching the timing mark 7. The timing position of the crankshaft is determined by whether the timing mark 7 and the observation hole 8 coincide. As shown in the figure, the primary drive gear, which is driven on the crankshaft, is provided with a timing mark 7. At the same time, the crankshaft housing is provided with an observation hole 8 that matches the timing mark 7. When the timing hole 7 and the observation hole 8 coincide, it can be determined that the crankshaft is in the timing position. Otherwise, it is determined that the crankshaft is not in the timing position.

[0027] In this embodiment, the timing mark 7 is a timing calibration hole opened on the primary drive tooth; as shown in the figure, the timing mark 7 provided on the primary drive tooth is a timing calibration hole, and a pin can be inserted to determine whether it is in the timing position. At the same time, the timing mark 7 can also adopt other styles, which will not be described in detail here.

[0028] In this embodiment, the timing drive wheel 5 is provided with an auxiliary timing mark 501, which corresponds radially to the timing mark 7 of the primary drive gear. As shown in the figure, the disc surface of the timing drive wheel 5, which is coaxially mounted with the primary drive gear, is also provided with an auxiliary timing mark 501 that corresponds radially to the timing mark 7 of the primary drive gear. Since the timing drive wheel 5 rotates synchronously with the primary drive gear, the rotation position of the timing mark 7 of the primary drive gear can be determined by the auxiliary timing mark 501 on the timing drive wheel 5. This design makes it convenient for installers to determine the timing mark covered by the crankcase by using the exposed auxiliary timing mark 501 of the timing drive wheel 5, thereby improving the installation efficiency of the valve train.

[0029] In this embodiment, a camshaft flat groove 6 is also included, which works with the camshaft flat groove to perform timing positioning of the camshaft 3; as shown in the figure, before assembling the timing driven wheel 2, a camshaft 3 timing fixture is used to position the cylinder head cover mounting plane, and works with the camshaft flat groove to perform timing positioning of the camshaft 3.

[0030] A motorcycle is equipped with an engine having a high-precision valve train as described above. Preferably, when installing the valve train on the engine, the crankshaft is rotated, and the auxiliary timing mark 501 on the timing drive 5 is observed. When the timing hole 7 on the primary drive gear of the crankshaft and the observation hole 8 on the crankshaft housing coincide (which can be confirmed using a pin), the crankshaft timing position is determined. Before assembling the timing driven 2, a camshaft 3 timing fixture is used, positioned using the cylinder head cover mounting plane, and the camshaft 3 timing is determined in conjunction with the camshaft flat plate. After confirming the crankshaft and camshaft 3 timing, the timing chain 1 and the timing wheel 2 are assembled. After aligning the intake marking 202 and exhaust marking 203 on the timing driven wheel 2, two bolts are pre-installed on the timing driven wheel 2 to prevent it from being unbalanced after the timing chain 1 is tensioned. Finally, the tensioner 4 is installed to tension the timing chain 1. After the timing chain 1 is tensioned, the timing driven wheel 2 will rotate slightly. Due to the design of the waist-shaped hole 201, the timing driven wheel 2 can still be accurately assembled onto the camshaft 3 after slight rotation. This eliminates the deformation error and machining dimension error of the timing chain 1 after tensioning and eliminates the angular error caused by the assembly of the timing gear. Finally, the bolts of the timing driven wheel 2 are tightened to complete the valve train installation.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An engine with a high-precision valve train, characterized in that: The device includes a crankcase, a crankshaft, and a valve train that can be driven by the crankshaft. The valve train includes a timing drive, a timing driven, and a camshaft. The timing driven is driven and mounted on the camshaft, and its mounting position relative to the camshaft is adjustable in the circumferential direction.

2. The engine with a high-precision valve train according to claim 1, characterized in that: The timing driven wheel is provided with several evenly distributed waist-shaped holes along the circumference, so that the timing driven wheel is adjustable in the circumferential direction relative to the camshaft mounting position.

3. The engine with a high-precision valve train according to claim 2, characterized in that: The timing driven wheel is also provided with an intake mark and an exhaust mark for determining the timing position of the timing driven wheel, and the intake mark and the exhaust mark have the same diameter.

4. The engine with a high-precision valve train according to claim 3, characterized in that: The intake and exhaust markings are engraved lines on the same diameter.

5. The engine with a high-precision valve train according to claim 1, characterized in that: The crankshaft is provided with a primary drive gear for outputting power. The primary drive gear is provided with a timing mark. The crankshaft housing is also provided with an observation hole for matching the timing mark. The timing position of the crankshaft is determined by whether the timing mark coincides with the observation hole.

6. The engine with a high-precision valve train according to claim 5, characterized in that: The timing mark is a timing calibration hole opened on the primary drive gear.

7. The engine with a high-precision valve train according to claim 1, characterized in that: The timing drive gear is provided with an auxiliary timing mark, which corresponds radially to the timing mark of the primary drive gear.

8. The engine with a high-precision valve train according to claim 1, characterized in that: It also includes a camshaft flat groove, which works with the camshaft flat groove for camshaft timing positioning.

9. A motorcycle, characterized in that: The motorcycle is equipped with an engine having a high-precision valve train as described in any one of claims 1-8.

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