A camshaft phase disc arrangement structure for a V-type two-cylinder engine and a V-type two-cylinder engine

Abstract

This utility model relates to a camshaft phase plate arrangement structure for a V-type two-cylinder engine and a V-type two-cylinder engine. The utility model includes a camshaft bore, disposed on the engine body and engaging with the camshaft; a camshaft oil seal seat, disposed on the camshaft and located at the front end of the camshaft bore, the camshaft oil seal seat having a camshaft oil seal engaging with the camshaft; and a camshaft phase plate, the camshaft phase plate being clamped between the camshaft gear hub and the camshaft axial positioning shoulder, and separated from the engine body by the camshaft oil seal. This utility model can reduce the overall size of the engine while controlling costs.

Description

Technical Field

[0001] This utility model relates to the field of engine design technology, and in particular to a camshaft phase disk arrangement structure for a V-type two-cylinder engine and a V-type two-cylinder engine. Background Technology

[0002] The key factors in developing low-power range extenders are cost and size. Only when costs are controlled within a certain range will the market accept it, while engine size determines whether a low-power range extender can be matched with the compact engine bays of small vehicles (A00 class, A0 class). Small vehicles are generally equipped with V-type engines as their power source. Conventional V-type engines typically use a double overhead camshaft configuration, meaning there is a pair of valve train camshafts on each of the left and right cylinder heads.

[0003] As a key component of the engine, the camshaft's core function is to convert the crankshaft's rotation into valve opening and closing through precise cam profile design and accurate rotation phase. The camshaft phase plate is another crucial component, primarily providing camshaft angle signals to the engine ECU (Electronic Control Unit). Combined with signals from the crankshaft position sensor, this allows the ECU to accurately determine the cylinder top dead center and valve opening / closing phase, thereby achieving precise control over fuel injection timing and ignition advance angle.

[0004] Normally, the camshaft phase disc rotates with the camshaft, and is typically located at the front or rear end of the camshaft or integrated within the VVT ​​phase adjuster. This results in an excessively long axial dimension of the engine, making it unsuitable for accommodating the layout of range extenders in smaller vehicles.

[0005] Reference Figure 1 The diagram shows the conventional engine camshaft, gear, and signal disc arrangement. Intake camshaft 1-1 and exhaust camshaft 1-2 are arranged longitudinally along the engine on the same cylinder head. Each camshaft has multiple cams machined on it, each corresponding to a specific valve, used to drive the opening and closing of the intake and exhaust valves via tappets, rocker arms, and other transmission components. Intake camshaft gear 1-3 and exhaust camshaft gear 1-4 are fixed to the front ends of the two camshafts, respectively. A phase disc 1-5 is mounted on the end of one camshaft furthest from the corresponding gear. This type of traditional structure has a relatively large overall axial dimension and poor structural compactness. Summary of the Invention

[0006] Therefore, this utility model provides a camshaft phase disc arrangement structure for a V-type two-cylinder engine and a V-type two-cylinder engine, which can reduce the overall size of the engine while controlling costs.

[0007] To solve the above-mentioned technical problems, this utility model provides a camshaft phase disc arrangement structure for a V-type two-cylinder engine. The V-type two-cylinder engine includes an engine block, a camshaft centrally located in the engine block, and a camshaft gear hub connected to the front end of the camshaft. The arrangement structure includes: A camshaft hole is provided on the machine body and mates with the camshaft. A camshaft oil seal seat is disposed on the camshaft and located at the front end of the camshaft hole, and a camshaft oil seal that mates with the camshaft is disposed on the camshaft oil seal seat; A camshaft phase disc is held between the camshaft gear hub and the camshaft axial positioning shoulder, and is separated from the machine body by the camshaft oil seal.

[0008] In one embodiment of this utility model, the camshaft front end is provided with a camshaft bolt pressure block and a camshaft bolt, the camshaft toothed wheel hub is sleeved on the camshaft front end, and the camshaft phase disc is pressed by the camshaft bolt pressure block under the axial preload of the camshaft bolt.

[0009] In one embodiment of this utility model, the camshaft is provided with a keyway, and the camshaft phase disk is provided with a mounting groove corresponding to the keyway. The camshaft phase disk and the camshaft are positioned and fixed in the circumferential direction by the keys provided in the keyway and the mounting groove.

[0010] In one embodiment of this utility model, the front end of the machine body is provided with a front timing cover, and the rear end of the machine body is provided with a rear timing cover. The front timing cover and the rear timing cover together form a sealed timing cavity that accommodates the camshaft toothed wheel hub and the camshaft phase disc.

[0011] This utility model also provides a V-type two-cylinder engine, including the aforementioned V-type two-cylinder engine camshaft phase disk arrangement structure.

[0012] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: The present invention discloses a V-type two-cylinder engine camshaft phase disk arrangement structure and a V-type two-cylinder engine, which effectively controls costs while reducing the overall size of the engine. The engine adopts a central camshaft overall arrangement, which makes full use of the central area of ​​the engine body. Structurally, it is beneficial to control the overall height and axial dimensions of the engine, thereby achieving a compact design of the engine size.

[0013] The camshaft phase disc of this invention is located at the front end of the engine block and is separated from the engine block by an oil seal seat. The phase disc is arranged inside the timing cover, which not only achieves a good lubricating oil sealing effect, but also reduces the impact of engine vibration on the phase disc and signal acquisition to a certain extent, ensuring its long-term, stable and reliable operation.

[0014] Furthermore, considering that thermal deformation may cause deformation of the camshaft phase disc or even affect its working reliability, the engine adapted to this utility model adopts an overall layout of front intake and rear exhaust. Therefore, the camshaft phase disc is placed between the engine block and the camshaft gear, close to the front of the engine, so that it is in a relatively low temperature environment, thereby effectively avoiding the problem of the phase disc becoming loose or stuck under high temperature conditions. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the conventional engine camshaft, gears, and signal disc arrangement.

[0017] Figure 2 This is a schematic diagram of the camshaft phase disc arrangement structure of the V-type two-cylinder engine of this utility model.

[0018] Figure 3 This is an exploded view of the timing system and body of this utility model.

[0019] Explanation of reference numerals on the accompanying drawings: 1-1. Intake camshaft; 1-2. Exhaust camshaft; 1-3. Intake camshaft gear; 1-4. Exhaust camshaft gear; 1-5. Phase disc; 2-1 Camshaft bolt clamp; 2-2 Camshaft gear hub; 2-3 Camshaft oil seal; 2-4 Camshaft; 2-5 Engine block; 2-6 Camshaft oil seal seat; 2-7 Camshaft phase disc; 2-8 Camshaft bolt; 3-1. Front timing cover; 3-2. Camshaft gear; 3-3. Rear timing cover; 3-4. Oil pump. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0021] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0022] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0023] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0024] Reference Figure 2 As shown, this utility model discloses a camshaft phase disc arrangement structure for a V-type two-cylinder engine. The V-type two-cylinder engine includes a body 2-5, a camshaft 2-4 centrally located in the body 2-5, and a camshaft gear hub 2-2 connected to the front end of the camshaft 2-4. The arrangement structure includes: A camshaft hole is provided on the machine body 2-5 and mates with the camshaft 2-4; A camshaft oil seal seat 2-6 is disposed on the camshaft 2-4 and located at the front end of the camshaft hole. A camshaft oil seal 2-3 that mates with the camshaft 2-4 is disposed on the camshaft oil seal seat 2-6. Camshaft phase disc 2-7 is clamped between the camshaft gear hub 2-2 and the axial positioning shoulder of the camshaft 2-4, and is separated from the machine body 2-5 by the camshaft oil seal 2-3.

[0025] It should be noted that the V-type two-cylinder engine adopts an overall layout of front intake and rear exhaust. The camshaft phase plate 2-7 is located in the front area of ​​the engine block 2-5 near the engine intake end, so that the camshaft phase plate 2-7 is in a low temperature environment, avoiding loosening or jamming caused by thermal deformation.

[0026] This V-type two-cylinder engine is a V-type two-cylinder four-valve engine. It uses a centrally mounted camshaft 2-4 in conjunction with pushrods and rocker arms to drive the intake and exhaust valves of each cylinder. The camshaft phase plate 2-7 rotates synchronously with the centrally mounted camshaft 2-4 to provide the engine control unit with the position and speed information of the camshaft 2-4, so as to achieve precise control of the valve timing of this V-type two-cylinder engine.

[0027] This V-type two-cylinder engine has only one centrally mounted camshaft 2-4. The centrally mounted camshaft 2-4, located in the middle of the engine block 2-5, works with pushrods and rocker arms to drive the intake and exhaust valves of the left and right cylinder heads respectively. This eliminates the need for multiple overhead camshafts 2-4 and their phase discs on each cylinder head, reducing the engine's height and axial dimensions, as well as the number of camshafts 2-4. This effectively controls the overall size and cost of the engine while ensuring the performance of the V-type two-cylinder engine.

[0028] In one embodiment, the camshaft 2-4 is provided with a camshaft bolt clamping block 2-1 and a camshaft bolt 2-8 at its front end. The camshaft gear hub 2-2 is sleeved on the front end of the camshaft 2-4. The camshaft phase disc 2-7 is pressed by the camshaft bolt clamping block 2-1 under the axial preload of the camshaft bolt 2-8, so that the camshaft phase disc 2-7 is reliably locked on the camshaft 2-4.

[0029] In one embodiment, the camshaft 2-4 is provided with a keyway, and the camshaft phase disk 2-7 is provided with a mounting groove corresponding to the keyway. The camshaft phase disk 2-7 and the camshaft 2-4 are positioned and fixed in the circumferential direction by the keys provided in the keyway and the mounting groove, so as to ensure that the phase signal output by the camshaft phase disk 2-7 corresponds precisely to the angular position of the camshaft 2-4.

[0030] In one embodiment, refer to Figure 3 As shown, the engine block 2-5 has a front timing cover 3-1 at its front end and a rear timing cover 3-3 at its rear. The front and rear timing covers 3-1 together form a sealed timing cavity that accommodates the camshaft gear hub 2-2 and the camshaft phase disc 2-7. The front and / or rear timing covers 3-1 are made of plastic. The camshaft phase disc 2-7 is completely enclosed within the plastic timing cover to reduce the impact of engine vibration on the operation of the camshaft phase disc 2-7. Additionally, an oil pump 3-4 is also provided. This arrangement of a centrally located camshaft 2-4 achieves a compact arrangement of the camshaft phase disc 2-7 close to the front end of the engine block 2-5.

[0031] In one embodiment, the camshaft phase disc 2-7 is made of low-carbon steel to improve the strength and durability of the phase disc under long-term engine operating conditions while ensuring machinability and signal characteristic accuracy.

[0032] It should be noted that this V-type two-cylinder engine camshaft phase disc arrangement structure proposes a camshaft phase disc 2-7 arrangement scheme that matches the structure of a V-type two-cylinder engine using a centrally located camshaft 2-4 and pushrod and rocker arm drive method. This reduces the overall engine size while effectively controlling costs. The overall arrangement of the engine with a centrally located camshaft 2-4 makes full use of the central area of ​​the engine block 2-5, which is structurally beneficial for controlling the overall height and axial dimensions of the engine, thereby achieving a compact engine design.

[0033] Specifically, the camshaft phase disc 2-7 is preferably made of low carbon steel. The camshaft phase disc 2-7 is arranged between the machine body 2-5 and the camshaft pulley. During installation, the camshaft 2-4 is arranged in the middle. The camshaft 2-4 is inserted into the machine body 2-5 from the front end. The oil seal seat is installed in front of the camshaft 2-4 hole on the machine body 2-5. The camshaft bolt 2-8 is installed in front of the camshaft 2-4. The bolt is tightened into a pressure block. The pressure block squeezes the camshaft gear hub 2-2. The hub presses the camshaft phase disc 2-7 onto the camshaft 2-4.

[0034] Reference Figure 3 As shown, this is an exploded structural diagram of the timing system and engine block 2-5. Compared with the traditional double overhead camshaft structure, the dimensions of this engine in both height and axial direction are significantly reduced. At the same time, the number of camshafts 2-4 is reduced from four to one, which effectively simplifies the valve train structure and further reduces the overall size of the engine. With the reduction in the number of parts, it has a significant cost reduction advantage.

[0035] In summary, compared with existing technologies, by rationally arranging the camshaft 2-4 and its phase disc, a V-type two-cylinder four-valve engine with a centrally located camshaft 2-4, pushrod, and rocker arm drive configuration is achieved. This allows for more efficient use of the central space of the engine block 2-5, ensuring both valve timing and control precision while maintaining structural compactness and manufacturing economy.

[0036] Considering that thermal deformation may cause deformation of the camshaft phase disc 2-7 and even affect its working reliability, the engine adapted to this utility model adopts an overall layout of front intake and rear exhaust. Therefore, the camshaft phase disc 2-7 is set between the engine block 2-5 and the camshaft gear 3-2, close to the front of the engine, so that it is in a relatively low temperature environment, thereby effectively avoiding the problem of the phase disc becoming loose or stuck under high temperature conditions.

[0037] In addition, the camshaft phase disc 2-7 is located at the front end of the engine block 2-5 and is separated from the engine block 2-5 by an oil seal seat. The phase disc is arranged inside the timing cover made of plastic material, which not only achieves a good lubricating oil sealing effect, but also reduces the impact of engine vibration on the phase disc and signal acquisition to a certain extent, ensuring its long-term, stable and reliable operation.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A camshaft phase disc arrangement structure for a V-type two-cylinder engine, the V-type two-cylinder engine comprising an engine block (2-5), a camshaft (2-4) centrally disposed in the engine block (2-5), and a camshaft gear hub (2-2) connected to the front end of the camshaft (2-4), characterized in that, The layout structure includes: A camshaft hole is provided on the machine body (2-5) and mates with the camshaft (2-4); A camshaft oil seal seat (2-6) is provided on the camshaft (2-4) and located at the front end of the camshaft hole. A camshaft oil seal (2-3) that mates with the camshaft (2-4) is provided on the camshaft oil seal seat (2-6). The camshaft phase disc (2-7) is held between the camshaft toothed wheel hub (2-2) and the axial positioning shoulder of the camshaft (2-4), and is separated from the machine body (2-5) by the camshaft oil seal (2-3).

2. The camshaft phase disc arrangement structure for a V-type two-cylinder engine according to claim 1, characterized in that, The camshaft (2-4) is provided with a camshaft bolt pressure block (2-1) and a camshaft bolt (2-8) at the front end. The camshaft toothed wheel hub (2-2) is sleeved on the front end of the camshaft (2-4). The camshaft phase disc (2-7) is pressed by the camshaft bolt pressure block (2-1) under the axial preload of the camshaft bolt (2-8).

3. The camshaft phase disc arrangement structure for a V-type two-cylinder engine according to claim 1, characterized in that, The camshaft (2-4) is provided with a keyway, and the camshaft phase disk (2-7) is provided with a mounting groove corresponding to the keyway. The camshaft phase disk (2-7) and the camshaft (2-4) are positioned and fixed in the circumferential direction by the keys provided in the keyway and the mounting groove.

4. The camshaft phase disc arrangement structure for a V-type two-cylinder engine according to claim 1, characterized in that, The front end of the body (2-5) is provided with a front timing cover (3-1), and the rear end of the body (2-5) is provided with a rear timing cover (3-3). The front timing cover (3-1) and the rear timing cover (3-3) together form a sealed timing cavity that accommodates the camshaft toothed wheel hub (2-2) and the camshaft phase disc (2-7).

5. A V-type two-cylinder engine, characterized in that, Includes the V-type two-cylinder engine camshaft phase disk arrangement structure as described in any one of claims 1-4.

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