Double-cam direct-drive valve engine

Abstract

The utility model provides a double-cam direct-drive valve engine, and belongs to the technical field of engines. Comprising an engine body, an air inlet valve is installed in an air inlet channel of the engine body, an exhaust valve is installed in an exhaust channel of the engine body, a cam shaft is installed at an air cylinder cover of the engine body, tappets are installed on the top of the air inlet valve and the top of the exhaust valve, and the rolling wheel assembly comprises side blocks fixed to the ends of the tappets. A pin shaft is embedded in the side block, an inner wheel body is rotationally connected to the circumferential face of the pin shaft, and the outer wall of the inner wheel body is sleeved with an outer wheel sleeve. Through the arrangement of the inner wheel body, the outer wheel sleeve and the indicating pin, the idler wheel composed of the inner wheel body and the outer wheel sleeve is installed at the end of the tappet, the idler wheel can rotate on the pin shaft to reduce friction force between the cam and the tappet, abrasion of the cam and the tappet is reduced, normal opening and closing time and lift of a valve are powerfully guaranteed, and the service life of the valve is prolonged. Therefore, the stable output of the power of the engine body is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a dual-cam direct-drive valve engine. Background Art

[0002] A dual-cam direct-drive valve engine usually refers to a dual overhead camshaft engine. When the engine is running, the crankshaft drives the intake camshaft and exhaust camshaft to rotate through a timing chain or timing belt. During the intake stroke, the cam protrusion on the intake camshaft pushes the tappet on the intake valve to move downward, thereby opening the intake channel and allowing the air and fuel mixture to enter the cylinder. The working principle of the exhaust camshaft is similar to that of the intake camshaft. During the exhaust stroke, the cam on the exhaust camshaft pushes the tappet on the exhaust valve to move downward, opening the exhaust channel, thereby discharging the burned exhaust gas out of the cylinder. The dual camshaft design can more accurately control the opening and closing time of the intake and exhaust valves according to the different working conditions of the engine, improve the intake and exhaust efficiency, and enable the engine to obtain good power performance at various speeds.

[0003] When a common dual-cam direct-drive valve engine is in use, the raised part of the cam on the camshaft is used to squeeze the tappet installed on the top of the intake and exhaust valves, so that the tappet drives the intake valve or exhaust valve to move downward, thereby realizing the opening and closing of the intake and exhaust passages. However, the top of the tappet is in direct contact with the cam of the camshaft, and the friction between the top of the tappet and the cam is relatively large. Under the action of long-term high friction, scratches, dents and other wear marks may appear on the top of the tappet and the surface of the cam. This wear will change the shape of the tappet and the cam, affecting the normal opening and closing time and lift of the valve, thereby affecting the power output of the engine. Therefore, the present application provides a dual-cam direct-drive valve engine to meet the needs. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a dual-cam direct-drive valve engine to solve the technical problem that the wear between the cam and the tappet is large, which in severe cases affects the normal opening and closing time and lift of the valve, thereby affecting the power output of the engine.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A dual cam direct-drive valve engine comprises an engine body, an intake valve is installed in an intake passage of the engine body, an exhaust valve is installed in an exhaust passage of the engine body, a camshaft is installed on a cylinder head of the engine body, and tappets are installed on top of the intake valve and the exhaust valve, and further comprises:

[0007] The roller assembly includes a side block fixed to the end of the tappet, a pin shaft is embedded in the side block, an inner wheel body is rotatably connected to the circumferential surface of the pin shaft, an outer wheel sleeve is sleeved on the outer wall of the inner wheel body, the outer wall of the outer wheel sleeve is fitted with the cam surface of the camshaft, a plurality of countersunk holes are opened on the outer wall of the outer wheel sleeve, a plurality of circular holes are opened on the outer wall of the inner wheel body, an indicator pin is embedded in the countersunk hole, the indicator pin is inserted into the circular hole and fits with the inner wall of the circular hole, an indicator hole is opened in the indicator pin, and a notch is opened on the end of the indicator pin, and the notch is located inside the circular hole.

[0008] Preferably, the inner wall of the outer wheel sleeve is provided with an inclined guide surface 1.

[0009] Preferably, a plurality of positioning strips are fixed to the inner wall of the outer wheel sleeve, and a plurality of positioning grooves are opened on the outer wall of the inner wheel body. The positioning strips are inserted into the positioning grooves and fit against the inner walls of the positioning grooves.

[0010] Preferably, the end of the positioning bar is provided with an inclined guiding surface 2.

[0011] Preferably, the plurality of positioning strips are distributed in a circular array with the center of the inner wheel body as the array center.

[0012] Preferably, the head of the indicator pin is provided with an inclined guide surface three, and the end of the indicator pin is provided with an inclined guide surface four.

[0013] Preferably, the inner wall of the indicating hole is tapered on a side away from the pin shaft.

[0014] Preferably, a reinforcing rib is fixed to the side surface of the side block, and the reinforcing rib is fixed to the end of the tappet.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] In the above scheme, through the arrangement of the inner wheel body, the outer wheel sleeve and the indicator pin, the roller composed of the inner wheel body and the outer wheel sleeve is installed at the end of the tappet. The roller can rotate on the pin shaft to reduce the friction between the cam and the tappet, reduce the wear of the cam and the tappet, and effectively ensure the normal opening and closing time and lift of the valve, thereby ensuring the smooth output of the engine power.

[0017] Through the setting of the indicator pin, the indicator pin is installed on the outer wheel sleeve. As the use time increases, the head of the indicator pin will gradually wear. When it is worn to the position of the indicator hole, the indicator hole is exposed from the head position of the indicator pin. When the maintenance personnel observe the indicator hole, the outer wheel sleeve can be replaced. The indicator pin reminds the maintenance personnel of the wear status of the outer wheel sleeve, preventing excessive wear of the outer wheel sleeve, thereby further ensuring the normal opening and closing of the intake valve and exhaust valve.

[0018] By setting the positioning strip, the positioning strip is located in the positioning groove, and the outer wheel sleeve is positioned by the positioning strip to ensure that the countersunk hole on the outer wheel sleeve corresponds to the position of the circular hole on the inner wheel body, thereby facilitating the installation of the indicator pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and enable those skilled in the relevant art to make and use the present disclosure.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a cross-sectional view of the positioning strip of the utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the roller assembly of the present utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the outer wheel sleeve of the utility model;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the indicator pin of the present utility model;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the inner wheel body of the present utility model.

[0026] Reference numerals

[0027] 1. Engine body; 2. Intake valve; 3. Exhaust valve; 4. Camshaft; 5. Tappet; 6. Roller assembly; 7. Inner wheel body; 8. Side block; 9. Pin shaft; 10. Outer wheel sleeve; 11. Guide surface one; 12. Positioning strip; 13. Guide surface two; 14. Indicator pin; 15. Indicator hole; 16. Notch; 17. Guide surface three; 18. Guide surface four; 19. Countersunk hole; 20. Round hole; 21. Positioning groove.

[0028] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION

[0029] The following describes a dual-cam direct-drive valvetrain engine provided by the present invention in detail, with reference to the accompanying drawings and specific embodiments. It is also noted that, for the sake of completeness, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0030] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0031] like Figures 1-6 As shown, the embodiment of the present invention provides a dual cam direct-drive valve engine, comprising an engine body 1, an intake valve 2 installed in the intake passage of the engine body 1, an exhaust valve 3 installed in the exhaust passage of the engine body 1, a camshaft 4 installed on the cylinder head of the engine body 1, and tappets 5 installed on the top of the intake valve 2 and the exhaust valve 3, and further comprising:

[0032] The roller assembly 6 includes a side block 8 fixed to the end of the tappet 5, a pin 9 is embedded in the side block 8, and the inner wheel body 7 is rotatably connected to the circumferential surface of the pin 9. The outer wall of the inner wheel body 7 is covered with an outer wheel sleeve 10, and the outer wheel sleeve 10 and the inner wheel body 7 are interference fit. The outer wall of the outer wheel sleeve 10 fits the cam surface of the camshaft 4, and the outer wall of the outer wheel sleeve 10 is provided with a plurality of countersunk holes 19. The outer wall of the inner wheel body 7 is provided with a plurality of circular holes 20. The countersunk hole 19 is embedded with an indicator pin 14, and the indicator pin 14 is inserted into the circular hole 20 and fits with the inner wall of the circular hole 20. The countersunk hole 19 and the circular hole 20 are interference fit with the indicator pin 14. An indicator hole 15 is provided in the indicator pin 14, and a notch 16 is provided at the end of the indicator pin 14. The notch 16 is located in the circular hole 20 interior; the roller structure composed of the inner wheel body 7 and the outer wheel sleeve 10 is installed at the end of the tappet 5, and is rotated by the pin shaft 9 to achieve a rotational connection, so that the roller can rotate freely when the camshaft 4 rotates. This rotational motion greatly reduces the friction between the camshaft 4 and the tappet 5, and effectively reduces the wear of the cam and the tappet 5 in long-term operation. The reduction in wear effectively guarantees the normal opening and closing time and lift of the intake valve 2 and the exhaust valve 3, and avoids abnormal valve opening and closing due to wear, thereby ensuring the smooth output of power of the engine body 1. At the same time, the indicator hole 15 in the indicator pin 14 on the outer wheel sleeve 10 provides an indication of the degree of wear of the outer wheel sleeve 10, which is convenient for subsequent maintenance and replacement operations, and further improves the overall reliability and durability of the engine.

[0033] like Figure 4 As shown, in this embodiment, the inner wall of the outer wheel sleeve 10 is provided with an inclined guide surface 11; when the outer wheel sleeve 10 is installed on the inner wheel body 7, the outer wheel sleeve 10 and the inner wheel body 7 are easily aligned by the guidance of the guide surface 11, thereby facilitating the installation of the outer wheel sleeve 10.

[0034] like Figure 4 As shown, in this embodiment, a plurality of positioning strips 12 are fixed to the inner wall of the outer wheel sleeve 10, and a plurality of positioning grooves 21 are opened on the outer wall of the inner wheel body 7. The positioning strips 12 are inserted into the positioning grooves 21 and fit with the inner walls of the positioning grooves 21. The fitting relationship between the positioning strips 12 and the positioning grooves 21 is an interference fit. The positioning strips 12 are located in the positioning grooves 21, which can accurately position the outer wheel sleeve 10, ensuring that the outer wheel sleeve 10 will not be offset or misplaced during the rotation process, and ensuring that the countersunk hole 19 on the outer wheel sleeve 10 and the circular hole 20 on the inner wheel body 7 always maintain an accurate corresponding position, which is convenient for the installation and fixation of the indicator pin 14.

[0035] like Figure 4 As shown, in this embodiment, the end of the positioning bar 12 is provided with an inclined guide surface 2 13 ; the guide surface 2 13 is used to guide the positioning bar 12 when it is inserted into the positioning groove 21 , thereby facilitating the insertion of the positioning bar 12 into the positioning groove 21 .

[0036] like Figure 4 As shown, in this embodiment, several positioning strips 12 are distributed in a circular array with the center of the inner wheel body 7 as the array center; multiple positioning strips 12 are distributed in a circular array on the inner wheel body 7, which can evenly position and support the outer wheel sleeve 10 from multiple directions. This uniform distribution method enables the outer wheel sleeve 10 to evenly disperse the force to the inner wheel body 7 when it is subjected to the pressure and friction of the camshaft 4, thereby avoiding deformation or damage of components caused by local uneven force. At the same time, the circular array distribution also ensures that the relative position between the outer wheel sleeve 10 and the inner wheel body 7 is more stable, further improving the overall strength and reliability of the roller assembly 6.

[0037] like Figure 5 As shown, in this embodiment, the head of the indicator pin 14 is provided with an inclined guide surface three 17, and the end of the indicator pin 14 is provided with an inclined guide surface four 18; when installing the indicator pin 14, the guide surface three 17 can help the indicator pin 14 to be more easily inserted into the countersunk hole 19 of the outer wheel sleeve 10, and the guide surface four 18 is used to help the indicator pin 14 to be more easily inserted into the circular hole 20 on the inner wheel body 7, thereby reducing the difficulty and time of installation and improving the assembly efficiency.

[0038] like Figure 2 As shown, in this embodiment, the inner wall of the indicator hole 15 is tapered on the side away from the pin shaft 9; when the indicator pin 14 is worn and the indicator hole 15 is exposed, the exposed area of the indicator hole 15 is small when it is initially exposed. The smaller exposed area can effectively reduce the further wear of the indicator hole 15 itself caused by friction, and also greatly reduces the degree of wear caused by the edge of the indicator hole 15 contacting the cam on the camshaft 4.

[0039] like Figure 3 As shown, in this embodiment, the side of the side block 8 is fixed with a reinforcing rib, which is fixed to the end of the tappet 5; the reinforcing rib is used to improve the connection strength between the side block 8 and the tappet 5, and ensure the stability and firmness of the connection between the side block 8 and the tappet 5.

[0040] Working principle: When the engine body 1 is working, the camshaft 4 rotates under the power drive. The raised part of the cam on the camshaft 4 squeezes the roller assembly 6. The outer wheel sleeve 10 in the roller assembly 6 fits tightly against the cam surface. As the cam rotates, the outer wheel sleeve 10 drives the inner wheel body 7 to rotate around the pin 9. The roller composed of the inner wheel body 7 and the outer wheel sleeve 10 can rotate, greatly reducing the friction between the cam and the tappet 5, effectively reducing the wear of the cam and the tappet 5.

[0041] Driven by the camshaft 4, the tappet 5 and roller assembly 6 precisely control the opening and closing of the intake valve 2 and exhaust valve 3. During the intake stroke, the corresponding intake cam on the camshaft 4 for intake pushes the roller assembly 6 on the top of the intake valve 2, causing the tappet 5 to move downward, thereby driving the intake valve 2 to open and allowing fresh mixed air to smoothly enter the cylinder. During the exhaust stroke, the camshaft 4 for exhaust pushes the roller assembly 6 on the top of the exhaust valve 3 in the same way, causing the exhaust valve 3 to open and discharge the burned exhaust gas out of the cylinder.

[0042] As the engine body 1 continues to operate, the outer wheel sleeve 10 will gradually wear out. The indicator pin 14, which serves as an indicator of the wear degree of the outer wheel sleeve 10, will gradually wear out during use. When the wear reaches a certain extent, that is, the indicator hole 15 is exposed from the head of the indicator pin 14, the maintenance personnel can intuitively judge that the outer wheel sleeve 10 has reached a wear state that requires replacement, and thus replace it in time to avoid excessive wear of the outer wheel sleeve 10 affecting the normal opening and closing of the intake valve 2 and the exhaust valve 3, thereby effectively ensuring the stable operation of the engine body 1 and the smooth output of power.

[0043] The replacement method is as follows: remove the tappet 5 from the intake valve 2 and the exhaust valve 3, use a tool to knock the pin 9 off the side block 8, and after the pin 9 is removed, use a hook-shaped tool to insert it into the indicator hole 15 of the indicator pin 14, and make the hook-shaped tool hook the notch 16 at the end of the indicator pin 14, pull the indicator pin 14 out of the round hole 20 and the countersunk hole 19, and then use the tool to separate the outer wheel sleeve 10 from the inner wheel body 7. After separation, align the new outer wheel sleeve 10 with the inner wheel body 7, and use a hydraulic tool to press the outer wheel sleeve 10 against the outer wall of the inner wheel body 7 to achieve the outer wheel sleeve 10 and the inner wheel body 7. The interference fit connection is made, and the positioning strip 12 is inserted into the positioning groove 21 of the inner wheel body 7 to ensure that the countersunk hole 19 on the outer wheel sleeve 10 and the circular hole 20 on the inner wheel body 7 always maintain accurate corresponding positions. Then the new indicator pin 14 is pressed into the countersunk hole 19 and the circular hole 20, and then the inner wheel body 7 is placed between the two side blocks 8, and the pin shaft 9 passes through one of the side blocks 8 and the inner wheel body 7 and then inserted into the other side block 8. The pin shaft 9 and the side block 8 are also interference fit. Then the tappet 5 is installed on the intake valve 2 and the exhaust valve 3.

[0044] The present invention encompasses any substitutions, modifications, equivalent methods, and solutions that are not within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail in the preferred embodiments of the present invention above, but those skilled in the art can fully understand the present invention without these detailed descriptions.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A dual cam direct-drive valve engine, comprising an engine body (1), an intake valve (2) installed in an intake passage of the engine body (1), an exhaust valve (3) installed in an exhaust passage of the engine body (1), a camshaft (4) installed at a cylinder head of the engine body (1), and tappets (5) installed at the tops of the intake valve (2) and the exhaust valve (3), characterized in that: Also includes: The roller assembly (6) includes a side block (8) fixed to the end of the tappet (5), a pin shaft (9) is embedded in the side block (8), an inner wheel body (7) is rotatably connected on the circumferential surface of the pin shaft (9), an outer wheel sleeve (10) is sleeved on the outer wall of the inner wheel body (7), the outer wall of the outer wheel sleeve (10) is fitted with the cam surface of the camshaft (4), a plurality of countersunk holes (19) are opened on the outer wall of the outer wheel sleeve (10), a plurality of circular holes (20) are opened on the outer wall of the inner wheel body (7), an indicator pin (14) is embedded in the countersunk hole (19), the indicator pin (14) is inserted into the circular hole (20) and fits with the inner wall of the circular hole (20), an indicator hole (15) is opened in the indicator pin (14), and a notch (16) is opened at the end of the indicator pin (14), and the notch (16) is located inside the circular hole (20).

2. The dual cam direct drive valve engine according to claim 1, characterized in that: The inner wall of the outer wheel sleeve (10) is provided with an inclined guide surface (11).

3. The dual cam direct drive valve engine according to claim 1, characterized in that: A plurality of positioning strips (12) are fixed to the inner wall of the outer wheel sleeve (10), and a plurality of positioning grooves (21) are opened on the outer wall of the inner wheel body (7). The positioning strips (12) are inserted into the positioning grooves (21) and fit with the inner walls of the positioning grooves (21).

4. The dual cam direct drive valve engine according to claim 3, characterized in that: The end of the positioning strip (12) is provided with an inclined guiding surface 2 (13).

5. The dual cam direct drive valve engine according to claim 4, characterized in that: The plurality of positioning bars (12) are distributed in a circular array with the center of the inner wheel body (7) as the array center.

6. The dual cam direct drive valve engine according to claim 1, characterized in that: The head of the indicating pin (14) is provided with an inclined guide surface three (17), and the end of the indicating pin (14) is provided with an inclined guide surface four (18).

7. The dual cam direct drive valve engine according to claim 1, characterized in that: The inner wall of the indicating hole (15) is tapered on a side away from the pin (9).

8. The dual cam direct drive valve engine according to claim 1, characterized in that: A reinforcing rib is fixed to the side surface of the side block (8), and the reinforcing rib is fixed to the end of the tappet (5).

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