An engine cylinder head

Abstract

This utility model relates to an engine cylinder head, including a cylinder head body with a pressure relief channel. The channel contains a pressure relief port, a valve stem, and a valve spring. The valve stem is slidably disposed within the channel. The valve stem is used to open the pressure relief port forward under the push of a pusher, or to close the pressure relief port backward under the push of the valve spring. The pusher, driven by an external force component, moves to push the valve stem. The pusher has a pushing surface that contacts the valve stem, and the pushing surface is inclined forward. This product is simple to use and facilitates pressure relief operations.

Description

Technical Field

[0001] This utility model relates to an engine cylinder head. Background Technology

[0002] The cylinder head is mounted on top of the cylinder block, sealing the cylinder from above and forming the combustion chamber. It is constantly in contact with high-temperature, high-pressure combustion gases, thus bearing significant thermal and mechanical loads. Air-cooled engines have a cooling jacket inside the cylinder head, and the cooling vents on the lower end face of the cylinder head communicate with the cooling vents in the cylinder block. Circulating air is used to cool the combustion chamber and other high-temperature components. Currently, cylinder head products rarely have pressure relief structures; excessively high cylinder pressure can lead to problems such as detonation, starting difficulties, and unstable operation. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art by providing an engine cylinder head that is simple to use and easy to vent.

[0004] The technical solution of this utility model is as follows: An engine cylinder head includes a cylinder head body with a pressure relief channel. The channel is provided with a pressure relief port, a valve stem, and a valve spring. The valve stem is slidably disposed in the channel. The valve stem is used to open the pressure relief port forward under the push of a pusher or to close the pressure relief port backward under the push of the valve spring. The pusher is driven by an external force member to move and push the valve stem. The pusher has a pushing surface that contacts the valve stem, and the pushing surface is inclined forward.

[0005] By employing the above technical solution, pressure is released through the pressure relief port to ensure engine safety. In use, an external force component moves the valve pusher; this component can be automatic or manual. Because the pushing surface is angled forward, it slides against the valve stem, gradually pushing the valve stem forward to open the pressure relief port for gas release. The pressure relief port is then closed backward by the valve spring. This product is simple to use and facilitates gas release.

[0006] A further feature of this invention is that the pusher is slidably disposed within the movement channel of the cylinder head body, the lower end of the movement channel is connected to the pressure relief channel, the pushing surface is inclined forward from top to bottom, and a pusher spring is also provided within the movement channel to drive the pusher to return to its original position downward.

[0007] With the above-mentioned further configuration, the valve lifter slides upward, gradually pushing the valve stem forward through the pushing surface, while the valve lifter falls back, and the valve stem can be pushed backward by the valve spring.

[0008] A further feature of this invention is that one end of the external force member has a convex ball, and the top has a locking hole for the convex ball to slide in and out radially. The convex ball and the locking hole also form an axial positioning, thereby realizing the linkage between the top and the external force member.

[0009] The above-mentioned further design facilitates the radial movement of the convex ball into and out of the locking hole, and enables axial positioning.

[0010] A further feature of this invention is as follows: the cylinder head body has an installation port on its outer end, the installation port is used for the air valve rod to be installed into the pressure relief channel, a pressure cap is installed in the installation port, the pressure cap has an air outlet hole inside, the front end of the top has the pushing surface, the rear end of the top has a sliding groove that forms a sliding guide with the inner tube head of the pressure cap, the top also has an air passage hole that passes through both the front and rear ends, and there is a gap between the air passage hole and the inner tube head.

[0011] With the above-mentioned further configuration, the sliding of the top can be guided by the cooperation of the inner tube head and the sliding groove. In addition, there is a gap between the vent hole and the inner tube head, which can avoid blocking the vent hole and facilitate the air to be discharged from the vent hole to the vent hole of the pressure cap.

[0012] A further feature of this invention is as follows: a pressure relief seat is provided in the pressure relief channel, and the pressure relief port is provided at the front end of the pressure relief seat. The pressure relief seat has a spring channel inside. The valve stem has a rod portion and a head located at the front end of the rod portion. The head of the valve stem is used to open or close the pressure relief port. The rod portion passes through the spring channel. The valve spring is sleeved on the rod portion of the valve stem and abuts between the boss A on the inner wall of the front end of the spring channel and the boss B on the rear end of the rod portion.

[0013] With the above-mentioned further design, the pressure relief seat, valve spring, and valve stem are easy to install and fit together, facilitating valve stem sliding.

[0014] A further feature of this invention is that the external force component is a manual pull rod or a pull rope, and extends outside the cylinder head body.

[0015] With the above-mentioned further settings, the top can be slid by manually pulling the external force component outward, making operation convenient.

[0016] A further feature of this invention is that the cylinder head body also has a cooling jacket inside. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a specific embodiment of the present utility model; Figure 2 This is a structural diagram of the cylinder head in a specific embodiment of the present utility model; Figure 3 This is an internal structural diagram of a specific embodiment of the present utility model; Figure 4 for Figure 3 A magnified view of part I in the middle; Figure 5 This is a diagram showing the fit between the valve stem, top plate, and pressure cap in a specific embodiment of this utility model. Figure 6 This is a split view of the valve stem and pressure relief seat in a specific embodiment of this utility model; Figure 7 This is a diagram showing the fit between the top and the external force component in a specific embodiment of this utility model; Figure 8 This is a diagram showing the fit between the top and the cover in a specific embodiment of this utility model.

[0018] In the diagram: Cylinder head body 1, pressure relief channel 11, pressure relief port 2, valve stem 3, valve spring 4, valve pusher 5, external force component 6, push surface 51, motion channel 12, pusher spring 7, ball joint 61, locking hole 52, mounting port 13, pressure cap 8, exhaust port 81, inner tube head 82, slide groove 53, air passage 54, clearance 55, pressure relief seat 9, spring channel 91, stem 31, head 32, boss A911, boss B10, cooling sleeve 14, retaining ring 15. Detailed Implementation

[0019] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figure 1-8As shown, an engine cylinder head of this utility model includes a cylinder head body 1, a pressure relief channel 11 on the cylinder head body 1, and a cooling gas jacket 14 inside the cylinder head body 1. The pressure relief channel 11 is connected to the combustion chamber and its outer end is connected to the outside. The channel is provided with a pressure relief port 2, a valve stem 3 and a valve spring 4 (which can be a compression spring or a tension spring). The valve stem 3 is slidably disposed in the channel. The valve stem 3 is used to open the pressure relief port 2 forward under the push of the pusher 5, or to close the pressure relief port 2 backward under the push of the valve spring 4. The pusher 5 is driven by an external force member 6 to move and push the valve stem 3. The pusher 5 has a pushing surface 51 that contacts the valve stem 3. The pushing surface 51 is inclined forward. The pusher 5 is slidably mounted within the movement channel 12 of the cylinder head body 1. The lower end of the movement channel 12 is connected to the pressure relief channel 11. The pushing surface 51 is inclined forward from top to bottom. A pusher spring 7 for driving the pusher 5 to return to its downward position is also provided within the movement channel 12. The lower end of the external force member 6 has a convex ball 61. The pusher 5 has a locking hole 52 for the convex ball 61 to slide radially in and out. The convex ball 61 and the locking hole 52 also form an axial positioning (i.e., vertical direction), thereby realizing the vertical linkage between the pusher 5 and the external force member 6. The locking hole 52 can be a T-shaped hole. The external force member 6 is a manual pull rod or pull rope, extending outside the cylinder head body 1. The external force member 6 can also be automatically driven by a motor or cylinder. The cylinder head body 1 has a mounting port 13 on its outer end, which communicates with the pressure relief channel 11. The mounting port 13 is used for the valve stem 3 to be inserted into the pressure relief channel 11. A pressure cap 8 is installed in the mounting port 13, and the pressure cap 8 has an air outlet 81 inside. The front end of the top 5 has the pushing surface 51, and the rear end of the top 5 has a sliding groove 53 that forms a sliding guide with the inner tube head 82 of the pressure cap 8. The top 5 also has an air passage 54 that passes through both the front and rear ends, and there is a gap 55 between the air passage 54 and the inner tube head 82. Of course, the top 5 can also be configured for horizontal sliding.

[0021] A pressure relief seat 9 is provided within the pressure relief channel 11. The pressure relief seat 9 is threadedly installed within the pressure relief channel 11. The pressure relief port 2 is provided at the front end of the pressure relief seat 9. The pressure relief seat 9 has a spring channel 91 inside. The valve stem 3 has a stem portion 31 and a head 32 located at the front end of the stem portion. The head 32 of the valve stem 3 is used to open or close the pressure relief port 2. The stem portion 31 passes through the spring channel 91. The valve spring 4 is sleeved on the stem portion 31 of the valve stem 3 and abuts against the boss A911 on the inner wall of the front end of the spring channel 91 and the boss B10 on the rear end of the stem portion 31. The boss A911 is integrally or fixedly provided on the inner wall of the front end of the spring channel 91, and the boss B10 is sleeved on the rear end of the stem portion 31. A spring plate 15 is snapped onto the rear end of the stem portion of the valve stem 3. During installation, first insert the rod 31 backward into the spring channel 91, with the rear end of the rod 31 protruding from the spring channel 91. Then, fit the boss B10 onto the rear end of the rod 31 and install the spring 15. The boss B10 is supported by the spring 15, and multiple air holes are provided on the outer periphery of the boss B.

[0022] This invention allows for pressure relief through the pressure relief port 2, ensuring engine safety. In use, pulling the external force member 6 upwards causes the pusher 5 to slide upwards. Because the pushing surface 51 is tilted forward, it slides and contacts the valve stem 3, gradually pushing the valve stem 3 forward, causing it to separate and open the pressure relief port 2 for pressure release. Release the external force component 6, and the push spring 7 drives the pusher 5 to slide downwards and reset. The push surface 51 then contacts the valve stem 3 as it slides down, and the valve spring 4 pushes it back to close the pressure relief port 2. This product is simple to use and easy to operate for venting.

[0023] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An engine cylinder head, comprising a cylinder head body (1), characterized in that: The cylinder head body (1) has a pressure relief channel (11), in which a pressure relief port (2), a valve stem (3) and a valve spring (4) are provided. The valve stem (3) is slidably arranged in the channel. The valve stem (3) is used to open the pressure relief port (2) forward under the push of the pusher (5) or to close the pressure relief port (2) backward under the push of the valve spring (4). The pusher (5) is driven by an external force member (6) to push the valve stem (3). The pusher (5) has a push surface (51) that contacts the valve stem (3). The push surface (51) is inclined forward.

2. The engine cylinder head according to claim 1, characterized in that: The pusher (5) is slidably disposed in the movement channel (12) of the cylinder head body (1). The lower end of the movement channel (12) is connected to the pressure relief channel (11). The pushing surface (51) is inclined forward from top to bottom. A pusher spring (7) for driving the pusher (5) to reset downward is also provided in the movement channel (12).

3. The engine cylinder head according to claim 1, characterized in that: The external force member (6) has a convex ball (61) at one end, and the top (5) has a locking hole (52) for the convex ball (61) to slide in and out radially. The convex ball (61) and the locking hole (52) also form an axial positioning, thereby realizing the linkage between the top (5) and the external force member (6).

4. The engine cylinder head according to claim 1, 2, or 3, characterized in that: The cylinder head body (1) has an installation port (13) on its outer end. The installation port (13) is used for the air valve rod (3) to be installed into the pressure relief channel (11). A pressure cap (8) is installed in the installation port (13). The pressure cap (8) has an air outlet (81) inside. The front end of the top (5) has the pushing surface (51). The rear end of the top (5) has a sliding groove (53) that forms a sliding guide with the inner tube head (82) of the pressure cap (8). The top (5) also has an air passage (54) that passes through both the front and rear ends. There is a gap (55) between the air passage (54) and the inner tube head (82).

5. The engine cylinder head according to claim 1, 2, or 3, characterized in that: A pressure relief seat (9) is provided in the pressure relief channel (11), and the pressure relief port (2) is provided at the front end of the pressure relief seat (9). The pressure relief seat (9) has a spring channel (91) inside. The valve stem (3) has a rod (31) and a head (32) located at the front end of the rod. The head (32) of the valve stem (3) is used to open or close the pressure relief port (2). The rod (31) passes through the spring channel (91). The valve spring (4) is sleeved on the rod (31) of the valve stem (3) and abuts between the boss A (911) on the inner wall of the front end of the spring channel (91) and the boss B (10) on the rear end of the rod (31).

6. The engine cylinder head according to claim 1, 2, or 3, characterized in that: The external force component (6) is a manual pull rod or pull rope, and extends out of the cylinder head body (1).

7. The engine cylinder head according to claim 1, 2, or 3, characterized in that: The cylinder head body (1) also has a cooling jacket (14) inside.

Images