Cylinder cover without oil sprayer spacer bush
By designing upper and lower water jackets and a C-shaped semi-circular channel on the cylinder head to achieve bottom-up cooling, the problems of easy water leakage and low cooling efficiency of the injector bushing are solved, achieving efficient cooling and cost reduction, and improving the reliability and life of the engine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-03-03
AI Technical Summary
In the existing technology, the injector bushing is prone to water leakage, which increases the overall cost of the machine, has low cooling efficiency, and a long cooling water circulation path, resulting in insufficient engine reliability and durability.
The cylinder head is designed without an injector spacer and adopts an upper and lower water jacket structure. The coolant flows directly into the lower water jacket and passes through the upper water channel to the upper water jacket. Combined with the C-shaped semi-circular channel to optimize the flow rate, a bottom-up cooling method is achieved, which avoids water leakage from the spacer and reduces the circulation path.
It improves the reliability and cooling efficiency of the cylinder head, reduces the overall cost of the engine, extends its service life, and enhances the cooling effect in the nose area.
Smart Images
Figure CN223964528U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engine technology, and in particular relates to a cylinder head without an injector spacer. Background Technology
[0002] As a critical component of the engine, the cylinder head operates under high temperature and high pressure for extended periods, and the effective dissipation of internal heat is crucial for engine performance and lifespan. To reduce cylinder head temperature, current technology typically incorporates a cooling water jacket inside the cylinder head, where coolant circulates and removes heat. However, in actual operation, the hottest area of the cylinder head is concentrated in the nose area near the fuel injector holes, and the cooling effect in this area directly impacts the cylinder head's reliability and durability.
[0003] As engine performance continues to improve, the size of the intake manifold and valves gradually increases for the same cylinder diameter, resulting in limited space in the nose area and making it difficult to install traditional cooling water jackets. To solve this problem, existing technologies typically employ a through-type water jacket design, with a spacer at the injector orifice for injector installation. A top-down cooling method is also used, where coolant flows from the engine block to the upper water jacket of the cylinder head, and then from the upper water jacket to the lower water jacket, thus achieving cooling of the nose area.
[0004] However, this design has significant limitations. First, the use of injector bushings increases the overall engine cost. Furthermore, the bushings are threaded to the cylinder head and rely on sealant for sealing. Because the injector bushings are constantly exposed to the impact of high-temperature, high-pressure combustion gases, the sealant is prone to failure, leading to leaks and affecting the normal operation of the engine. In addition, the top-down cooling method requires the coolant to travel a long circulation path, increasing energy loss and reducing cooling efficiency. These problems make the need for improvement of existing technology increasingly urgent. Utility Model Content
[0005] To address the problems existing in the prior art, this utility model provides a cylinder head without an injector spacer, which increases the reliability of the cylinder head, avoids the problem of water leakage from the spacer, reduces the overall cost, and improves cooling efficiency by adopting a bottom-up cooling method.
[0006] To achieve the above objectives, the present invention provides a cylinder head without an injector spacer. The cylinder head is provided with an upper water jacket and a lower water jacket distributed vertically. The upper water jacket and the lower water jacket are connected by an upper water channel. The lower water jacket is close to the engine block, and the coolant flows directly from the engine block into the lower water jacket, then flows through the upper water channel to the upper water jacket. After cooling, the coolant flows out from the upper water jacket into the next cycle. The upper water channel includes perforated channels distributed on both sides of the injector orifice and semi-annular channels distributed around the injector orifice.
[0007] Preferably, both the upper water jacket and the lower water jacket are hollow cavities.
[0008] Preferably, the diameter of the perforated channel cross-section is The cross-section of the semi-annular channel is a C-shaped semi-circular ring.
[0009] Preferably, the semi-annular channel is located near the exhaust nose area. By narrowing the width of the C-shaped semi-circular ring, the flow rate is increased, allowing more coolant to flow to the nose area.
[0010] Preferred, two The channels are arranged on both sides of the injector orifice, connecting the lower water jacket and the upper water jacket to form a flow path for the coolant.
[0011] Preferably, the injector hole is machined directly on the cylinder head without the need for an additional spacer, and the injector is directly mounted on the cylinder head.
[0012] In summary, this utility model has the following beneficial technical effects:
[0013] This invention fundamentally solves the problem of water leakage from the separator. By using a bottom-up cooling method, a C-shaped water channel is set in the exhaust nose area to effectively organize the water flow to cool the hottest area of the cylinder head, reduce the circulation path of the cooling water, and effectively improve the cooling of the nose area. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the bottom structure of a cylinder head without a fuel injector spacer, showing the water supply path.
[0015] Figure 2 This is a schematic diagram of the bottom structure of a cylinder head without an injector bushing, showing the water flow path in the lower water jacket.
[0016] Figure 3 This is a side view of the upper and lower water jackets with water inlet paths marked in a cylinder head without an injector spacer according to the present invention.
[0017] Figure 4This is a schematic diagram of the side structure of the upper and lower water jackets in a cylinder head without an injector spacer, showing the water flow path in the lower water jacket.
[0018] Figure 5 This is a schematic diagram of the lower water jacket structure marked with the water inlet path in a cylinder head without an injector spacer according to the present invention.
[0019] Figure 6 This is a schematic diagram of the lower water jacket structure in a cylinder head without an injector spacer, showing the water flow path in the lower water jacket.
[0020] Figure 7 This is a cross-sectional view of a cylinder head with a water supply path marked on it, which is a cylinder head without an injector spacer according to this utility model.
[0021] Attached reference numerals: 1. Upper water jacket; 2. Lower water jacket; 3. 4. C-shaped semi-circular channel; 5. 6. Injector hole; 7. Cylinder head. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] In existing technology, a cooling water jacket is arranged inside the cylinder head 7. The coolant circulates within the water jacket to remove heat and reduce the temperature of the cylinder head 7. However, the temperature is highest in the nose area near the injector orifice 6. Existing technology uses a top-down cooling method by designing a through-type water jacket and installing a spacer at the injector orifice 6 to install the injector. This method not only increases the number of injector spacers, raising the overall cost, but also has the problem of leakage due to sealant failure. In addition, the cooling water circulation path is long, resulting in significant energy loss.
[0024] To address these issues, this utility model discloses a cylinder head without an injector spacer, aiming to solve the problems existing in the prior art. Through optimized design, this utility model improves the reliability of the cylinder head, avoids spacer leakage problems, reduces costs, and improves cooling efficiency by employing a bottom-up cooling method.
[0025] The cylinder head 7 of this invention has a water jacket cavity divided into an upper water jacket 1 and a lower water jacket 2. The upper water jacket 1 is located at the upper part of the cylinder head 7 and is an internal cavity used to hold coolant. It is connected to the lower water jacket 2 through an upper water channel to receive coolant flowing from the lower water jacket 2 and further cool the upper area of the cylinder head 7. The lower water jacket 2 is located at the lower part of the cylinder head 7 and is also an internal cavity, close to the engine block. Coolant flows directly from the engine block into the lower water jacket 2 and then flows upward through the upper water channel. As the coolant inlet area, it is responsible for receiving coolant from the engine block and guiding it to the upper water jacket 1.
[0026] The water supply channel includes two channels with a diameter of round hole ( Two (hole channels) and a C-shaped semi-circular ring structure (C-shaped semi-circular ring channel 4). The injection nozzles 6 are arranged on both sides, connecting the lower water jacket 2 and the upper water jacket 1 to form a coolant flow path, guiding the coolant from the lower water jacket 2 to the upper water jacket 1, participating in the cooling cycle of the cylinder head 7. The C-shaped semi-circular channel 4 is arranged around the injection nozzles 6, close to the exhaust nose area. By narrowing the width of the C-shaped semi-circular channel, the flow rate is increased, allowing more coolant to flow to the nose area, focusing on cooling the hottest exhaust nose area of the cylinder head 7 and improving cooling efficiency.
[0027] The injector hole 6 is machined directly onto the cylinder head 7, located near the C-shaped semi-circular channel 4. No additional spacer is needed; the injector is directly mounted on the cylinder head 7, avoiding spacer leakage and reducing costs. The entire cylinder head 7 water jacket cavity is divided into an upper water jacket 1 and a lower water jacket 2, containing a cooling water jacket. Coolant flows from the engine block into the lower water jacket 2 and then upwards through the upper water channel, ultimately cooling the entire cylinder head 7. This allows it to withstand the impact of high-temperature, high-pressure combustion gases. The optimized cooling design (bottom-up cooling method) improves the cooling effect in the nose area, extending the service life of the cylinder head 7.
[0028] The coolant flow path is as follows: it flows directly from the engine block into the lower water jacket 2, and then through the upper water channel ( The coolant flows upward through the perforated channel and the C-shaped semi-circular channel 4, entering the upper water jacket 1. The C-shaped semi-circular channel 4 increases the flow velocity by narrowing its width, allowing more coolant to flow to the exhaust nose area, achieving efficient cooling. After cooling is complete, the coolant flows out from the upper water jacket 1 and enters the next cycle.
[0029] The technical improvements and effects of this invention are significant: the injector-free spacer design avoids spacer leakage problems and reduces costs. The bottom-up cooling method reduces the coolant circulation path, lowers energy loss, and improves cooling efficiency. The optimized C-shaped semi-circular channel 4 increases the flow rate by adjusting its width, allowing the coolant to preferentially flow to the hottest exhaust nose area, thus solving the high-temperature problem. The attached diagram shows in detail the flow path of the coolant inside the cylinder head 7, further illustrating the cooling effect and structural design of this invention.
[0030] This invention provides a cylinder head 7 without an injector spacer. Through a bottom-up cooling method and a C-shaped water channel design, it effectively improves the cooling efficiency of the nose area, reduces the circulation path of the cooling water, lowers the cost, and improves the reliability and service life of the cylinder head 7.
[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A cylinder head without a fuel injector spacer, characterized in that The cylinder cover (7) is provided with an upper water jacket (1) and a lower water jacket (2) distributed in upper and lower positions, and the upper water jacket (1) is communicated with the lower water jacket (2) through an upper water channel; the lower water jacket (2) is close to the engine body, and the cooling liquid directly flows into the lower water jacket (2) from the engine body, then flows to the upper water jacket (1) through the upper water channel, and then flows out from the upper water jacket (1) to enter the next cycle after being cooled; the upper water channel includes a hole-shaped channel distributed on both sides of an oil injector hole (6) and a semi-ring-shaped channel distributed around the oil injector hole (6).
2. A cylinder head without fuel injector spool piece according to claim 1, characterized in that The upper water jacket (1) and the lower water jacket (2) are both hollow cavities.
3. A cylinder head without fuel injector spool sleeve according to claim 1, characterized in that The hole-like passage cross section diameter is The semi-ring-like passage cross section is a C-shaped semi-circle ring.
4. A cylinder head without fuel injector spool sleeve according to claim 3, characterized in that The semi-ring-shaped channel is close to the exhaust nose bridge area, and the width of the C-shaped semi-circle ring is narrowed to increase the flow rate, so that more cooling liquid flows to the nose bridge area.
5. A cylinder head without fuel injector spool sleeve according to claim 1, characterized in that Two The two hole channels are arranged on both sides of the fuel injector hole (6) respectively, connecting the lower water jacket (2) and the upper water jacket (1) to form a flow path of the cooling liquid.
6. A cylinder head without fuel injector spool sleeve according to claim 1, characterized in that The oil injector hole (6) is directly formed on the cylinder cover (7) without an additional spacer, and the oil injector is directly installed on the cylinder cover (7).