A high temperature resistant camshaft assembly

Abstract

The utility model discloses a kind of high-temperature-resistant camshaft assemblies, relate to camshaft assembly technical field.The high-temperature-resistant camshaft assembly, including journal, cooling assembly includes multiple cams, the inside of journal is provided with first cooling channel, the inside of journal is provided with four second cooling channels, the inside of multiple cams is provided with third cooling channel, by constructing the three-dimensional cooling network of "axial transport+radial heat dissipation" in journal and cam inside, change the situation of traditional external oil channel cooling deficiency.First cooling channel utilizes the pressure change generated by expansion section and contraction section, so that cooling oil can be accurately and efficiently transported to the key heating area of cam and journal, especially the third cooling channel is close to cam working surface, compared with traditional surface spray lubrication, the cooling efficiency is greatly improved, effectively avoids the deformation problem caused by local overheating of camshaft.

Description

Technical Field

[0001] This utility model relates to the field of camshaft assembly technology, and in particular to a high-temperature resistant camshaft assembly. Background Technology

[0002] In diesel engine systems, the camshaft, as a core transmission component of the valve train and fuel injection system, directly affects the engine's power output, fuel economy, and emissions. Diesel engines, with their advantages of high compression ratio and high thermal efficiency, are widely used in heavy-duty trucks, marine power systems, and power generation equipment (non-road applications). However, the harsh operating environment also places higher demands on the camshaft.

[0003] Currently, diesel engine camshafts generally employ an external oil passage cooling and lubrication system, delivering lubricating oil to the camshaft journal and cam surface via cylinder block oil passages. However, this traditional technology has drawbacks. The layout of the external oil passages is easily constrained by the compact engine structure, making it difficult to achieve precise lubrication of critical camshaft components (such as cam tips and journal transition fillets), leading to insufficient local lubrication. Under high-load conditions, the cooling efficiency of the external oil passages cannot meet the rapid heat dissipation requirements of the camshaft, resulting in localized overheating and deformation, affecting valve timing and fuel injection accuracy, and consequently causing problems such as reduced engine power and increased fuel consumption. Therefore, this invention proposes a novel solution. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a high-temperature resistant camshaft assembly. This assembly can solve the problem that the layout of the external oil passage is easily restricted by the compact structure of the engine, making it difficult to achieve precise lubrication of key parts of the camshaft (such as the cam tip and journal transition fillet), resulting in insufficient local lubrication. Under high load conditions, the cooling efficiency of the external oil passage cannot meet the rapid heat dissipation requirements of the camshaft, leading to local overheating and deformation, which affects valve timing and fuel injection accuracy.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature resistant camshaft assembly, including a journal;

[0006] A cooling assembly is mounted on the journal and includes multiple cams, all of which are integrally formed with the journal.

[0007] The journal has a first cooling channel inside, four second cooling channels inside, and a third cooling channel inside each of the multiple cams. The multiple third cooling channels are connected to the corresponding second cooling channels.

[0008] The first cooling channel has a smooth, expanding, contracting, and smooth continuous structure, and the first cooling channel and the four second cooling channels all pass through the journal.

[0009] Preferably, the cooling assembly further includes a guide block, which is fixed to the right side of the journal by bolts, and the first cooling channel is connected to a plurality of second cooling channels through the guide block;

[0010] An oil passage connector is fixed to the left side of the journal by bolts, and an oil pipe is rotatably connected to the left side of the oil passage connector.

[0011] The oil pipe is connected to the first cooling channel through an oil line connector, which seals off the left side of the second cooling channel.

[0012] Preferably, the contact position between the oil line connector and the oil pipe is rotary sealed.

[0013] Preferably, the plurality of cams are divided into four groups and each group is arranged at a 90° interval.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: This high-temperature resistant camshaft assembly, by constructing a three-dimensional cooling network of "axial transport + radial heat dissipation" inside the journal and cam, changes the situation of insufficient cooling by traditional external oil passages. The first cooling channel utilizes the pressure changes generated by the expansion and contraction sections to enable the cooling oil to be accurately and efficiently delivered to the key heat-generating areas of the cam and journal. In particular, the third cooling channel is close to the working surface of the cam, which significantly improves the cooling efficiency compared with traditional surface spray lubrication and effectively avoids the deformation problem of the camshaft caused by local overheating. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of a high-temperature resistant camshaft assembly according to the present invention;

[0017] Figure 2 This is a schematic diagram of the oil circuit connector of this utility model;

[0018] Figure 3 This is a schematic diagram of the first cooling channel of this utility model;

[0019] Figure 4 This is a schematic diagram of the third cooling channel of this utility model.

[0020] Reference numerals: 1. Journal; 2. Cam; 3. Oil passage connector; 4. Guide block; 5. Oil pipe; 6. First cooling channel; 7. Second cooling channel; 8. Third cooling channel. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of this utility model. Preferred embodiments of this utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, enabling a person to intuitively and vividly understand each technical feature and overall technical solution of this utility model. However, they should not be construed as limiting the scope of protection of this utility model. In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0022] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the order of the indicated technical features. In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a high-temperature resistant camshaft assembly, including a journal 1 and a cooling assembly. The cooling assembly is disposed on the journal 1 and includes multiple cams 2, all of which are integrally formed with the journal 1. A first cooling channel 6 is formed inside the journal 1, and four second cooling channels 7 are formed inside the journal 1. A third cooling channel 8 is formed inside each of the multiple cams 2, and the multiple third cooling channels 8 are respectively connected to the corresponding second cooling channels 7. The first cooling channel 6 has a smooth, expanding, contracting, and smooth continuous structure. The first cooling channel 6 and the four second cooling channels 7 all penetrate the journal 1.

[0024] The cooling assembly also includes a guide block 4, which is fixed to the right side of the journal 1 by bolts. The first cooling channel 6 is connected to multiple second cooling channels 7 through the guide block 4. An oil pipe connector 3 is fixed to the left side of the journal 1 by bolts. An oil pipe 5 is rotatably connected to the left side of the oil pipe connector 3. The oil pipe 5 is connected to the first cooling channel 6 through the oil pipe connector 3. The oil pipe connector 3 closes the left side of the second cooling channel 7.

[0025] The contact point between the oil line connector 3 and the oil pipe 5 is rotated to form a seal.

[0026] Multiple cams 2 are divided into four groups and each group (two cams per group) is set apart at 90° intervals (or multiples thereof, 180°).

[0027] When using this camshaft assembly, the oil pipe 5 is connected to an external independent cooling pump to deliver cooling oil to the oil line connector 3; the oil line connector 3 is connected to the oil pipe 5 through a rotary sealing structure to ensure that the oil seal does not leak when the camshaft rotates, and at the same time guides the oil into the first cooling channel 6 inside the journal 1.

[0028] The oil will create a Venturi effect in the first cooling channel 6. The first cooling channel 6 has a continuous structure of "smooth → expansion → contraction → smooth", similar to a Venturi tube. When the cooling oil flows through it:

[0029] Expansion section: The oil flow rate decreases and the pressure increases to ensure that the oil is evenly distributed to each branch channel;

[0030] Contraction section: The flow rate increases sharply, creating a negative pressure effect that accelerates the flow of oil to the guide block 4 and the second cooling channel 7; this structure improves the flow efficiency of the cooling medium and enhances the heat exchange capacity through fluid dynamics optimization.

[0031] The guide block 4 is fixed to the right side of the journal 1 and serves as the connecting hub between the first cooling channel 6 and the four second cooling channels 7, so as to evenly distribute the oil in the main channel to each second cooling channel 7. Each second cooling channel 7 corresponds to a set of cams 2, which is connected to the third cooling channel 8 inside the cam 2. The cooling oil flows directly through the interior of the cam 2 through the third cooling channel 8 to absorb the heat generated by friction and high temperature when the cam 2 is working, especially for targeted cooling of the high-load contact area between the cam and the valve tappet or rocker arm.

[0032] When integrated with the engine lubrication system, the oil flows back to the oil pan to participate in oil circulation and heat dissipation. The oil is then cooled by the cooler and reused.

[0033] Axial channel first cooling channel 6: runs through the entire length of the journal, provides the main cooling path, and balances the overall temperature distribution of the journal;

[0034] Radial channels: Second cooling channel 7 and third cooling channel 8: Perpendicular to the axial direction, they transport the cooling medium to the heat-generating area of ​​the cam core, forming a three-dimensional cooling network of "axial transport + radial heat dissipation".

[0035] Multiple cams 2 are divided into four groups, each group is evenly distributed around the journal 1 with a 90° interval, and each group is independently supplied with liquid by four second cooling channels 7; thus avoiding the problem of "insufficient cooling in overheated areas and excessive cooling in low-load areas".

[0036] The rotary sealing structure of the oil line connector 3 and the oil pipe 5 ensures that the cooling medium does not leak when the camshaft rotates at high speed, while allowing the oil pipe 5 to maintain a fixed direction, such as when connected to the engine's fixed pipeline, to adapt to the continuous rotation of the camshaft.

[0037] Through the pressure regulation of the Venturi-type first cooling channel 6 and the diversion effect of the guide block 4, the cooling medium forms a stable and uniform flow inside the journal and cam, avoiding material softening or wear caused by local overheating.

[0038] The cam 2 and journal 1 are integrally formed, reducing the thermal resistance caused by assembly gaps. The third cooling channel 8 is close to the working surface of the cam, directly carrying away the high heat at the contact point, which improves the cooling efficiency compared to traditional surface spray lubrication.

[0039] Structural Description: Journal 1: As the basic support structure of the camshaft assembly, it not only supports multiple cams 2 and other components, but also has a first cooling channel 6 and a second cooling channel 7 inside, which form the main channel for axial cooling medium transmission, providing a basic path for the cooling and lubrication of the entire assembly, while balancing the overall temperature distribution of the journal.

[0040] Cam 2: It is integrally formed with journal 1 and is a key actuator for realizing valve timing and fuel injection functions; its internal third cooling channel 8 is close to the working surface and can directly remove the heat generated by high-load contact areas such as valve tappets, achieving targeted cooling of key parts of the cam, reducing wear, and ensuring working accuracy.

[0041] The first cooling channel 6 has a Venturi-style "smooth → expansion → contraction → smooth" structure and is the main transport channel for cooling oil. The expansion section reduces the oil flow rate and increases the pressure to achieve uniform oil distribution. The contraction section accelerates the oil flow and generates negative pressure. Together with the guide block 4, the oil is efficiently transported to each branch channel, optimizing the fluid dynamics performance and enhancing the heat exchange capacity.

[0042] Second cooling channel 7: Perpendicular to the axial direction, it serves as a transition channel connecting the first cooling channel 6 and the third cooling channel 8. It radially transports the cooling oil from the main channel to the corresponding cam assembly. After connecting with the third cooling channel 8, it enables the cooling oil to accurately reach the cam heating area, forming a three-dimensional cooling network of "axial transport + radial heat dissipation".

[0043] The third cooling channel 8 is directly located inside the cam 2 and is a key structure for achieving efficient local cooling of the cam. When the cooling oil flows through this channel, it can directly absorb the large amount of heat generated by friction during the operation of the cam. Compared with traditional surface spray lubrication, it significantly improves the cooling efficiency and avoids local overheating of the cam.

[0044] Guide block 4: Fixed on the right side of journal 1, serving as the connecting hub between the first cooling channel 6 and the second cooling channel 7. Its function is to evenly distribute the oil from the main channel to the four second cooling channels 7, ensuring that each cam assembly can obtain an equal and stable amount of cooling oil, thus guaranteeing the uniformity of cooling and lubrication.

[0045] Oil line connector 3: Fixed on the left side of journal 1, it is rotatably connected to oil pipe 5 to introduce oil delivered by external cooling pump into the first cooling channel 6; on the other hand, it seals the left side of the second cooling channel 7 to prevent oil leakage; its rotary sealing structure with oil pipe 5 ensures the sealing and reliability of the cooling system when the camshaft rotates at high speed.

[0046] Oil pipe 5: Serves as the connection medium between the external cooling system and the camshaft assembly. It is rotatably connected to the oil circuit connector 3 to stably deliver the cooling oil provided by the external independent cooling pump to the internal oil circuit of the camshaft, while adapting to the continuous rotation of the camshaft.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-temperature resistant camshaft assembly, characterized in that: Including journal (1); A cooling assembly is provided on the journal (1). The cooling assembly includes multiple cams (2), all of which are integrally formed with the journal (1). The journal (1) has a first cooling channel (6) inside, and four second cooling channels (7) are provided inside the journal (1). The multiple cams (2) each have a third cooling channel (8) inside, and the multiple third cooling channels (8) are connected to the corresponding second cooling channels (7). The first cooling channel (6) has a smooth, expanding, contracting, and smooth continuous structure. The first cooling channel (6) and the four second cooling channels (7) all pass through the journal (1).

2. The high-temperature resistant camshaft assembly according to claim 1, characterized in that: The cooling assembly also includes a guide block (4), which is fixed to the right side of the journal (1) by bolts. The first cooling channel (6) is connected to a plurality of second cooling channels (7) through the guide block (4). An oil pipe (5) is rotatably connected to the left side of the journal (1) by bolts. The oil pipe (5) is connected to the first cooling channel (6) through the oil line connector (3), and the oil line connector (3) seals the left side of the second cooling channel (7).

3. The high-temperature resistant camshaft assembly according to claim 2, characterized in that: The contact position of the oil line connector (3) and the oil pipe (5) is rotated and sealed.

4. A high-temperature resistant camshaft assembly according to claim 1 or 2, characterized in that: The multiple cams (2) are divided into four groups and each group is arranged at a 90° interval.

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