Small-cylinder-center-distance and large-cylinder-diameter cylinder block cooling structure and method
By incorporating transverse water channels and sleeve structures in a cylinder block with a small cylinder center distance and large cylinder diameter, the problem of insufficient cooling effect is solved, achieving more effective cooling, extending the engine's service life, and ensuring structural strength.
Patent Information
- Application Number
- CN202511501441.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-01-09
AI Technical Summary
Existing cylinder blocks with small cylinder center distance and large cylinder diameter have insufficient cooling effect, leading to overheating of the cylinder bores and problems such as cylinder scoring or premature wear.
Water chambers are set on both sides of the cylinder bore, and transverse water channels are opened between adjacent cylinder bores. The water chambers and transverse water channels are connected by a sleeve and an annular water chamber to realize the flow of coolant. The sleeve is installed through the cylinder head bolt holes to support the cylinder liner and prevent strength deformation.
It improves cooling efficiency, extends engine life, ensures the performance of cylinder head bolts is not affected, and meets the requirements of miniaturization design.
Smart Images
Figure CN121296321A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of engine technology, and more specifically, to a cooling structure and method for a cylinder block with a small cylinder center distance and a large cylinder bore. Background Technology
[0002] A cylinder block with a small cylinder center distance and a large cylinder diameter is a type of small cylinder block, such as... Figure 1 As shown, in this cylinder block 9, the diameter d of the cylinder bore 1 is relatively large, while the center distance D between the two cylinder bores 1 is relatively small. In actual production, it is difficult to directly cast a cooling water jacket in this type of cylinder block with a small center distance and large bore. The piston inside the cylinder bore 1 can only be cooled through water chambers A2 and B3 on both sides of the cylinder bore 1. While this structural design can effectively dissipate heat, the inability to allow water to pass between adjacent cylinders means that the area between adjacent cylinders cannot be cooled. The cooling effect still needs improvement, and during long-term engine operation, problems such as cylinder bore overheating leading to cylinder scoring or premature wear are prone to occur.
[0003] Therefore, there is an urgent need to develop and design a cooling structure and method for cylinder blocks with small cylinder center distance and large cylinder diameter to solve the above problems. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter, which can effectively improve the cooling effect and ensure the structural strength of the cylinder block.
[0005] The second objective of this invention is to provide a cooling method for cylinder blocks with small cylinder center distance and large cylinder diameter, which can effectively extend the service life of the engine.
[0006] To achieve the above objective, the present invention provides a cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter, including water chamber A and water chamber B opened on both sides of the cylinder bore. Two cylinder head bolt holes are also provided between two adjacent cylinder bores. At least one transverse water channel is also provided between two adjacent cylinder bores. A sleeve is fixedly installed in one of the cylinder head bolt holes. An annular water chamber is recessed in the outer wall of the sleeve. At least one water passage hole is opened through the annular water chamber and water chamber A. One end of all the transverse water channels is connected to the annular water chamber, and the other end of all the transverse water channels is connected to the top surface of the cylinder block or water chamber B.
[0007] As a further improvement, a stepped hole is provided at the upper part of the cylinder head bolt hole, and the sleeve is fixedly installed in the stepped hole, with the outer diameter of the sleeve matching the inner diameter of the stepped hole and the height of the sleeve matching the height of the stepped hole.
[0008] Furthermore, a sealing ring is provided between the lower part of the sleeve and the side wall of the stepped hole, and the sealing ring is installed on the outer wall of the sleeve below the annular water cavity.
[0009] Furthermore, a sealing gasket is provided between the bottom of the sleeve and the bottom of the stepped hole, and the sealing gasket is placed at the bottom of the stepped hole.
[0010] Furthermore, the center distance between the two cylinder head bolt holes is less than the diameter of the cylinder hole.
[0011] Furthermore, a water collection channel is provided on the cylinder block near the side of the water chamber B, and the other end of all the transverse water channels is connected to the water collection channel, with the end of the water collection channel extending to the top surface of the cylinder block.
[0012] Furthermore, a sleeve is also fixedly installed in another cylinder head bolt hole. At least one water passage hole is opened through the annular water cavity corresponding to the sleeve and water cavity B. The other end of all the transverse water channels is connected to the annular water cavity corresponding to the sleeve.
[0013] To achieve the second objective mentioned above, the present invention provides a cooling method for a cylinder block with a small cylinder center distance and a large cylinder diameter. The cooling method involves the coolant in the water chamber A passing through the water passage and the annular water chamber of the sleeve in sequence, entering the transverse water to cool the position between two adjacent cylinder bores. Finally, the coolant flows back to the cylinder head cooling system on the top surface of the cylinder block or back to the water chamber B.
[0014] Furthermore, the coolant in all the transverse channels first flows into a collection channel, and then finally flows back to the cylinder head cooling system on the top surface of the cylinder block.
[0015] Furthermore, a sleeve is fixedly installed in another cylinder head bolt hole. At least one water passage hole is opened through the annular water chamber of the sleeve and water chamber B. The coolant in all the transverse water channels first flows into the annular water chamber of the sleeve, and then flows back to water chamber B through the water passage hole.
[0016] Beneficial effects Compared with the prior art, the advantages of this invention are as follows: 1. The cooling structure of the present invention, by opening a transverse water channel in the cylinder body between two adjacent cylinder bores, can divert water in water chamber A to the space between two adjacent cylinder bores, and finally return to the cylinder head cooling system or return to water chamber B, thereby achieving positional cooling between two adjacent cylinder bores, further improving the cooling effect, and thus extending the service life of the engine.
[0017] 2. The cooling structure of the present invention, by installing a sleeve with an annular water cavity in the cylinder head bolt holes, allows the coolant to enter the transverse water channel after passing through the annular water cavity. This solves the problem of the coolant not being able to connect between the cast cylinder head bolt pillars, making the cylinder block cooling structure layout more reasonable and more in line with the needs of miniaturization design. Furthermore, the coolant does not come into contact with the cylinder head bolts, ensuring that the performance of the cylinder head bolts is not affected. At the same time, the sleeve can effectively support the cylinder liner, preventing cylinder liner strength deformation, effectively solving the contradiction between cylinder liner strength and cooling, and further extending the service life of the engine. Attached Figure Description
[0018] Figure 1 This is a top view of the existing technology. Figure 2 This is a top view of the structure of Embodiment 1 of the present invention; Figure 3 for Figure 2 Enlarged structural diagram of KK; Figure 4 for Figure 3 Enlarged structural diagram at point C; Figure 5 This is an enlarged schematic diagram of the sleeve structure in this invention; Figure 6 This is a top view of the structure of Embodiment 2 of the present invention; Figure 7 for Figure 6 Enlarged structural diagram of II; Figure 8 for Figure 7 A magnified schematic diagram of the structure at point D.
[0019] Wherein: 1-Cylinder bore, 2-Water chamber A, 3-Water chamber B, 4-Cylinder head bolt hole, 5-Transverse water passage, 6-Sleeve, 7-Annular water chamber, 8-Water passage hole, 9-Cylinder block, 10-Step hole, 11-Sealing ring, 12-Sealing gasket, 13-Water collection passage. Detailed Implementation
[0020] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.
[0021] Example 1 See Figure 2-5The present invention discloses a cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter, including water chambers A2 and B3 opened on both sides of the cylinder bore 1. The water chambers A2 and B3 surround the cylinder bore 1. The coolant in the water chambers A2 and B3 serves as the main medium for cooling the cylinder bore 1. Two cylinder head bolt holes 4 are also provided between two adjacent cylinder bores 1. At least one transverse water channel 5 is also provided between two adjacent cylinder bores 1. In this embodiment, to further improve the cooling effect, multiple transverse water channels 5 are provided, specifically a layout of five transverse water channels 5. These five transverse water channels 5 are spaced apart in the vertical direction to avoid excessive unsupported area between adjacent cylinder bores 1, which could lead to deformation. A sleeve 6 is fixedly installed in one of the cylinder head bolt holes 4. This sleeve 6 is a cylindrical shell with an annular water cavity 7 recessed in its outer wall. The annular water cavity 7 is located in the middle of the sleeve 6. At least one water passage hole 8 is provided between the annular water cavity 7 and water cavity A2, and the water passage hole 8 is located inside the cylinder block 9, connecting the annular water cavity 7 and water cavity A2. In this embodiment, the number of water passage holes 8 is the same as the number of transverse water channels 5, ensuring sufficient coolant flow and facilitating machining. One end of all transverse water channels 5 is connected to the annular water cavity 7, and the other end of all transverse water channels 5 is connected to the top surface of the cylinder block 9, enabling coolant circulation. This embodiment is applicable to engines with a cylinder block cooling system and a cylinder head cooling system that are connected for circulating cooling.
[0022] The cooling structure of this invention, by installing a sleeve 6 with an annular water cavity 7 in the cylinder head bolt hole 4, allows the coolant to enter the transverse water channel 5 after passing through the annular water cavity 7. This solves the problem of the coolant not being able to connect between the cast cylinder head bolt pillars, making the cylinder block cooling structure layout more reasonable and more in line with the needs of miniaturization design. Furthermore, the coolant does not come into contact with the cylinder head bolts, ensuring that the performance of the cylinder head bolts is not affected. At the same time, the sleeve can effectively support the cylinder liner, preventing cylinder liner strength deformation, effectively solving the contradiction between cylinder liner strength and cooling, and further extending the service life of the engine.
[0023] Preferably, a stepped hole 10 is provided at the upper part of the cylinder head bolt hole 4. The diameter of the stepped hole 10 is larger than the diameter of the cylinder head bolt hole 4, so that a step is formed at the bottom of the stepped hole 10 to support the sleeve 6. The sleeve 6 is fixedly installed in the stepped hole 10, and the outer diameter of the sleeve 6 is adapted to the inner diameter of the stepped hole 10, so that the sleeve 6 fits against the inner wall of the stepped hole 10. The height of the sleeve 6 is adapted to the height of the stepped hole 10, so that the top of the sleeve 6 is flush with the top surface of the cylinder block 9, and the cylinder head can press the sleeve 6 tightly. Specifically, the sleeve 6 can be press-fitted into the stepped hole 10 by interference fit, or it can be fastened into the stepped hole 10 by screws or welded to the stepped hole 10.
[0024] Preferably, a sealing ring 11 is provided between the lower part of the sleeve 6 and the side wall of the stepped hole 10 to prevent coolant in the annular water cavity 7 from leaking to the bottom of the cylinder head bolt hole 4, further ensuring the performance of the cylinder head bolts. The sealing ring 11 is installed on the outer wall of the sleeve 6 below the annular water cavity 7. Specifically, a groove is opened on the lower outer wall of the sleeve 6, and the sealing ring 11 is installed in the groove for easy installation. Furthermore, a sealing gasket 12 is also provided between the bottom of the sleeve 6 and the bottom of the stepped hole 10. The sealing gasket 12 is placed at the bottom of the stepped hole 10, which not only plays a secondary sealing role, but also can still achieve a seal even if the sealing ring 11 fails, further improving the sealing effect. Moreover, the axial sealing method of the sleeve 6 pressing the sealing gasket 12, which cooperates with the radial sealing of the sealing ring 1, can greatly improve the sealing effect.
[0025] Preferably, the center distance between the two cylinder head bolt holes 4 is smaller than the diameter of the cylinder hole 1, which satisfies the cylinder head installation requirements while allowing the water chamber A2 and water chamber B3 to have a larger area, further improving the cooling effect.
[0026] Preferably, a water collection channel 13 is provided on the cylinder block 9 near the water chamber B3. The other end of all the transverse water channels 5 is connected to the water collection channel 13. The end of the water collection channel 13 extends to the top surface of the cylinder block 9, so as to facilitate the diversion of coolant from all the transverse water channels 5 to the top of the cylinder block 1.
[0027] This embodiment also provides a cooling method for cylinder blocks with small cylinder center distance and large cylinder diameter. The cooling method involves the coolant in water chamber A2 sequentially passing through water passage 8 and the annular water chamber 7 of sleeve 6 into the transverse water channel 5 to cool the area between two adjacent cylinder bores 1. Finally, the coolant flows back to the cylinder head cooling system on the top surface of the cylinder block 9. Specifically, the coolant in all transverse water channels 5 first flows into a water collection channel 13, and then finally flows back to the cylinder head cooling system on the top surface of the cylinder block 9.
[0028] The cooling method of the present invention, by opening a transverse water channel 5 in the cylinder block 9 between two adjacent cylinder bores 1, can divert water in the water chamber A2 to the area between the two adjacent cylinder bores 1, and finally return it to the cylinder head cooling system, thereby achieving cooling of the area between the two adjacent cylinder bores 1, further improving the cooling effect, and thus extending the service life of the engine.
[0029] Example 2 See Figure 6-8 As shown, this is another embodiment of the present invention. This embodiment is basically the same as Embodiment 1, except that the other end of all the transverse water channels 5 is connected to the water chamber B3 to realize coolant circulation. This embodiment is applicable to engines with self-circulating coolant in the cylinder block cooling system.
[0030] Preferably, a sleeve 6 is also fixedly installed in another cylinder head bolt hole 4. At least one water passage hole 8 is provided through the annular water cavity 7 corresponding to the sleeve 6 and the water cavity B3. In this embodiment, the number of water passage holes 8 is the same as the number of transverse water channels 5 to ensure sufficient coolant flow and facilitate processing. The other end of all transverse water channels 5 is connected to the annular water cavity 7 corresponding to the sleeve 6, so that the coolant can be guided to the water cavity B3. Furthermore, the cylinder head bolt hole 4 corresponding to the sleeve 6 is also provided with a stepped hole 10, a sealing ring 11 and a sealing gasket 13. Its specific structure and installation method are the same as in embodiment 1, and will not be described again here.
[0031] This embodiment also provides a cooling method for cylinder blocks with small cylinder center distance and large cylinder diameter. The cooling method involves the coolant in water chamber A2 sequentially passing through a water passage hole 8 and the annular water chamber 7 of a sleeve 6 into the transverse water channel 5 to cool the area between two adjacent cylinder bores 1. Finally, the coolant flows back into water chamber B3. Specifically, a sleeve 6 is fixedly installed in another cylinder head bolt hole 4. At least one water passage hole 8 is formed between the annular water chamber 7 of the sleeve 6 and water chamber B3. All the coolant in the transverse water channel 5 first flows into the annular water chamber 7 of the sleeve 6, and finally flows back into water chamber B3 through the water passage hole 8.
[0032] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.
Claims
1. A cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter, comprising water chambers A (2) and B (3) opened on both sides of a cylinder bore (1), and two cylinder head bolt holes (4) provided between two adjacent cylinder bores (1), characterized in that, At least one transverse water channel (5) is provided between two adjacent cylinder bores (1). A sleeve (6) is fixedly installed in one of the cylinder head bolt holes (4). An annular water cavity (7) is recessed in the outer wall of the sleeve (6). At least one water passage (8) is provided between the annular water cavity (7) and the water cavity A (2). One end of all the transverse water channels (5) is connected to the annular water cavity (7), and the other end of all the transverse water channels (5) is connected to the top surface of the cylinder block (9) or the water cavity B (3).
2. The cylinder block cooling structure with small cylinder center distance and large cylinder diameter according to claim 1, characterized in that, The upper part of the cylinder head bolt hole (4) is provided with a stepped hole (10), the sleeve (6) is fixedly installed in the stepped hole (10), and the outer diameter of the sleeve (6) is adapted to the inner diameter of the stepped hole (10), and the height of the sleeve (6) is adapted to the height of the stepped hole (10).
3. The cylinder block cooling structure with small cylinder center distance and large cylinder diameter according to claim 2, characterized in that, A sealing ring (11) is provided between the lower part of the sleeve (6) and the side wall of the stepped hole (10), and the sealing ring (11) is installed on the outer wall of the sleeve (6) below the annular water cavity (7).
4. The cylinder block cooling structure with small cylinder center distance and large cylinder diameter according to claim 3, characterized in that, A sealing gasket (12) is provided between the bottom of the sleeve (6) and the bottom of the stepped hole (10), and the sealing gasket (12) is placed at the bottom of the stepped hole (10).
5. The cylinder block cooling structure with small cylinder center distance and large cylinder diameter according to claim 1, characterized in that, The center distance between the two cylinder head bolt holes (4) is less than the diameter of the cylinder hole (1).
6. A cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter according to any one of claims 1-5, characterized in that, A water collection channel (13) is provided on the cylinder body (9) near the water cavity B (3). The other end of all the transverse water channels (5) is connected to the water collection channel (13), and the end of the water collection channel (13) extends to the top surface of the cylinder body (9).
7. A cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter according to any one of claims 1-5, characterized in that, Another cylinder head bolt hole (4) is also fixedly installed with a sleeve (6). At least one water passage hole (8) is opened between the annular water cavity (7) corresponding to the sleeve (6) and the water cavity B (3). The other end of all the transverse water channels (5) is connected to the annular water cavity (7) corresponding to the sleeve (6).
8. A cooling method for a cylinder block cooling structure with a small cylinder center distance and a large cylinder diameter according to claim 1, characterized in that, The cooling method is as follows: the coolant in the water chamber A (2) passes through the water passage (8) and the annular water chamber (7) of the sleeve (6) in sequence and enters the transverse water channel (5) to cool the position between two adjacent cylinder bores (1). Finally, the coolant flows back to the cylinder head cooling system on the top surface of the cylinder block (9) or flows back to the water chamber B (3).
9. The cooling method according to claim 8, characterized in that, All the coolant in the transverse channels (5) first flows into a collection channel (13) and then flows back to the cylinder head cooling system on the top surface of the cylinder block (9).
10. The cooling method according to claim 8, characterized in that, A sleeve (6) is fixedly installed in another cylinder head bolt hole (4). At least one water passage hole (8) is opened between the annular water chamber (7) of the sleeve (6) and the water chamber B (3). The coolant in all the transverse water channels (5) first flows into the annular water chamber (7) of the sleeve (6), and then flows back to the water chamber B (3) through the water passage hole (8).