Hollowed-out cylinder cover

Abstract

The utility model discloses a hollow-out type cylinder cover which is installed on a valve plate and comprises a high-pressure cavity and an exhaust cavity, the high-pressure cavity is connected with the exhaust cavity, a hollow-out portion is arranged in the area outside the high-pressure cavity and the exhaust cavity, and the valve plate of the hollow-out portion is exposed. The hollow design is carried out on the cylinder cover, due to the existence of the hollow parts, the cavity structures such as the high-pressure cavity and the exhaust cavity are more dispersed and more prominent, more heat dissipation channels are provided, three-dimensional heat dissipation can be carried out through the surfaces in different directions, the heat dissipation capacity is enhanced, and heat is prevented from being excessively transferred to the valve plate and accumulated on the head of the cylinder. By means of the hollowed-out design, cavity structures such as the high-pressure cavity and the exhaust cavity are dispersed, the design of a large-area whole block structure of a traditional air cylinder cover is abandoned, the size of the high-pressure cavity is reduced, the reinforcing ribs are arranged to be connected with the installation part and the high-pressure cavity, the deformation resistance strength of the air cylinder cover can be improved, and therefore after the periphery of the air cylinder cover is locked through screws, the air cylinder cover can not be damaged. The sealing effect of the cylinder cover can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and more specifically, to a hollow cylinder cover. Background Art

[0002] At present, most household refrigerator compressors are of fully enclosed reciprocating structure, with the compressor housing on the outside and the compressor movement on the inside. During operation, the gas flow path is from the intake pipe into the compressor housing, through the intake muffler to the cylinder, and after compression in the cylinder, enters the inner cavity of the cylinder head, and finally leaves the cylinder head and is discharged from the exhaust pipe through the internal exhaust pipe.

[0003] During the operation of the refrigerator compressor, since the compressor is a fully enclosed structure, the temperature inside the compressor housing will rise. Considering the working efficiency of the compressor, it is hoped that the temperature of the gas inhaled by the compressor movement should not be too high. If the temperature of the inhaled gas is too high, it will cause the cylinder head to overheat and affect the performance. When the compressor is working, the gas enters and exits the cylinder through the valve assembly. Therefore, the heat dissipation and heat insulation capabilities of the valve assembly will have a greater impact on the cylinder head temperature. Most of the existing refrigerator compressor valve assembly assemblies are stacked structures, that is, they are stacked layer by layer from the bottom gasket to the top cylinder head, and the cylinder head is the top layer. Most of the existing compressor cylinder heads are integral structures, almost the entire surface is covered on the valve plate, such as Figure 1 As shown, such a structure is not conducive to the heat dissipation of the valve assembly and affects the efficiency of the compressor. The utility model patent with publication number CN218881798U discloses a plug-in assembly tent, which has a simple overall structure and a stable frame without looseness, but needs to be built on site when in use, which is inconvenient to install. Utility Model Content

[0004] Most of the existing cylinder heads are monolithic structures, with a large area covering the valve plate, which is not conducive to the heat dissipation of the valve group components and affects the efficiency of the compressor. To overcome this defect, the utility model provides a hollow cylinder head, which can reduce the contact area between the cylinder head and the valve plate while meeting the cylinder head function, thereby preventing the cylinder head from overheating and achieving the effect of heat dissipation as soon as possible.

[0005] The technical solution of the utility model is: a hollow cylinder head, which is installed on a valve plate, including a high-pressure chamber and an exhaust chamber, the high-pressure chamber and the exhaust chamber are connected, and the area outside the high-pressure chamber and the exhaust chamber has a hollow part, and the valve plate of the hollow part is exposed. During the operation of the compressor, the temperature of the cylinder head part of the movement is relatively high, and the temperature of the gas inside the high-pressure chamber of the cylinder head is correspondingly relatively high. If effective heat dissipation cannot be performed, the temperature is transmitted to the valve plate, thereby affecting the suction temperature and ultimately affecting the performance of the compressor. In addition, on the traditional cylinder head, the volume of the high-pressure chamber in the center is relatively large. When the cylinder head is fixed to the valve plate by screws, it is easy to cause micro-deformation of the cylinder head due to the unbalanced torque of the screws around the cylinder head, thereby causing the sealing effect of the high-pressure chamber to decrease. The utility model performs a hollow design on the cylinder head. The existence of the hollow part makes the cavity structures such as the high-pressure chamber and the exhaust chamber more dispersed and more prominent, and has more heat dissipation channels. Three-dimensional heat dissipation can be performed through surfaces in different directions, thereby enhancing the heat dissipation capacity and preventing excessive heat from being transmitted to the valve plate and accumulating in the cylinder head.

[0006] Preferably, it further comprises a plurality of mounting parts, the mounting parts are provided with mounting holes, the inner end faces of the mounting parts are fitted with the valve plate, and the mounting parts are connected to the high-pressure chamber and the exhaust chamber through reinforcing ribs. The utility model adopts a hollow design, abandons the traditional large-area monolithic structure design of the cylinder head, reduces the volume of the high-pressure chamber, and the smaller volume of the high-pressure chamber is less prone to deformation. The reinforcement ribs are provided to connect the mounting parts and the high-pressure chamber, which can further improve the anti-deformation strength of the cylinder head itself. Therefore, after the screws around the cylinder head are tightened, the sealing effect of the cylinder head can be improved.

[0007] Preferably, the inner end surface of the reinforcing rib is also fitted with the valve plate, so that the fitting area between the cylinder head and the valve plate is larger and the sealing of the cylinder head is more reliable.

[0008] Preferably, sealing rings are provided on the high pressure chamber, the exhaust chamber, and the inner end surface of the mounting portion and the fitting surface of the valve plate.

[0009] Alternatively, a gap is left between the inner end surface of the reinforcing rib and the valve plate.

[0010] Preferably, the mounting portion and the reinforcing ribs are integrally formed with the high pressure chamber and the exhaust chamber.

[0011] Preferably, the mounting parts are connected by reinforcing ribs.

[0012] Preferably, the reinforcing ribs are integrally formed with the mounting portion.

[0013] The beneficial effects of the utility model are:

[0014] Enhanced heat dissipation capacity. The utility model has a hollowed-out design for the cylinder head. The existence of the hollowed-out part makes the cavity structures such as the high-pressure chamber and the exhaust chamber more dispersed and more prominent, with more heat dissipation channels. Three-dimensional heat dissipation can be performed through surfaces in different directions, thereby enhancing the heat dissipation capacity and preventing excessive heat from being transferred to the valve plate and accumulating in the cylinder head.

[0015] Improve the sealing effect of the cylinder head. The utility model disperses the cavity structures such as the high-pressure cavity and the exhaust cavity through a hollow design, abandons the traditional large-area monolithic structure design of the cylinder head, reduces the volume of the high-pressure cavity, and sets a reinforcing rib to connect the mounting part and the high-pressure cavity, which can improve the anti-deformation strength of the cylinder head itself. Therefore, after the screws around the cylinder head are tightened, the sealing effect of the cylinder head can be improved.

[0016] Improve exhaust efficiency. The hollow design of the cylinder head of the utility model reduces the high-pressure chamber, which is conducive to faster exhaust of gas from the high-pressure chamber out of the cylinder head. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a cylinder head in the prior art;

[0018] Figure 2 A structural schematic diagram of the utility model;

[0019] Figure 3 It is a structural schematic diagram of another perspective of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the utility model after installation with the valve plate;

[0021] Figure 5 It is a schematic diagram of the working state of the utility model;

[0022] Figure 6 This is a schematic diagram of the inner structure of the utility model;

[0023] Figure 7 This is another schematic diagram of the inner structure of the utility model.

[0024] In the figure, 1-high pressure chamber, 2-exhaust chamber, 3-valve plate, 4-mounting part, 5-mounting hole, 6-reinforcement rib, 7-sealing ring, 8-enhanced reinforcement rib, 9-cylinder head, 10-muffler head, 11-muffler head mounting seat. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the specific embodiments of the drawings.

[0026] Embodiment 1:

[0027] like Figures 2 to 6As shown, a hollow cylinder head is installed on a valve plate 3. The valve plate 3 is a rounded rectangular shape, and threaded holes are provided at the four corners of the valve plate 3. The hollow cylinder head includes a high-pressure chamber 1, an exhaust chamber 2, a muffler head mounting seat 11 and four mounting parts 4. The high-pressure chamber 1 and the exhaust chamber 2 are connected in a V shape. The inner end faces of the high-pressure chamber 1 and the exhaust chamber 2 are both in contact with the valve plate 3. The area outside the high-pressure chamber 1 and the exhaust chamber 2 has a hollow part, and the valve plate 3 in the hollow part is exposed. The mounting part 4 is provided with a mounting hole 5, and the mounting hole 5 is used to install screws. The inner end face of the mounting part 4 is in contact with the valve plate 3. The mounting part 4 is cylindrical, and the mounting holes 5 correspond to the threaded holes at the four corners of the valve plate 3. The mounting part 4 is connected to the high-pressure chamber 1 and the exhaust chamber 2 through a reinforcing rib 6, and the inner end face of the reinforcing rib 6 is also in contact with the valve plate 3. The muffler head mounting seat 11 includes a pair of symmetrically arranged vertical plates and an outer baffle. The vertical plates are integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. The vertical plates are perpendicular to the valve plate 3, and the inner side of the vertical plates faces the valve plate 3. The outer baffle is connected to the outer side of the vertical plates and is integrally formed with the two vertical plates, so that the muffler head mounting seat 11 forms a semi-closed structure. The muffler head 10 is installed in the muffler head mounting seat 11. The inner side surface of the muffler head mounting seat 11 is flush with the inner end surfaces of the high-pressure chamber 1 and the exhaust chamber 2. After the cylinder head and the valve plate 3 are installed, the inner side surface of the muffler head mounting seat 11 also fits with the surface of the valve plate 3. Sealing rings 7 are provided on the fitting surfaces of the high-pressure chamber 1 and the exhaust chamber 2 and the inner end surfaces of the mounting portion 4 and the valve plate 3. The mounting portion 4, the reinforcing ribs 6, and the muffler head mounting seat 11 are integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. The cylinder head 9 of the compressor corresponds to the cylinder cover via the valve plate 3 , and the cylinder head 9 abuts against the valve plate 3 . The valve plate 3 is provided with a passage connecting the cylinder head 9 and the high-pressure chamber 1 and the muffler head 10 .

[0028] When installing the hollow cylinder head and the valve plate 3, the mounting holes 5 of the mounting part 4 are matched one by one with the threaded holes on the valve plate 3, and screws are inserted into the mounting holes 5 and screwed into the threaded holes to tighten. Use a torque wrench to tighten the screws. When the compressor is working, the gas is sucked in from the muffler head 10, passes through the channel on the valve plate 3 and enters the cylinder head 9, and then passes through the valve plate 3 from the cylinder head 9 to enter the high-pressure chamber 1. After being compressed in the high-pressure chamber 1, it passes through the exhaust chamber 2 and then passes through the valve plate 3 to enter the cylinder head 9. The utility model improves the structure of the traditional cylinder head, reduces the volume of the high-pressure chamber 1 of the cylinder head, and hollows out the rest of the part. The hollow design of the cylinder head can increase the heat dissipation capacity and prevent excessive heat from being transferred to the valve plate 3 and accumulating in the cylinder head 9. The hollow design also connects the high-pressure chamber 1 and the mounting portion 4 of the cylinder head through the reinforcing rib 6, which changes the large-area integral structure of the traditional cylinder head. After the screws around the cylinder head are tightened, the reduced high-pressure chamber combined with the reinforcing ribs connecting the mounting portion and the high-pressure chamber can improve the deformation resistance of the cylinder head itself and improve the sealing effect of the cylinder head. After the cylinder head and the valve plate 3 are installed, the sealing ring 7 also helps to achieve a better sealing effect. The hollow design of the cylinder head of the utility model reduces the high-pressure chamber 1, which is conducive to faster discharge of gas from the high-pressure chamber 1 to the cylinder head.

[0029] Embodiment 2:

[0030] A hollow cylinder head is installed on a valve plate 3. The valve plate 3 is a rounded rectangular shape, and threaded holes are provided at the four corners of the valve plate 3. The hollow cylinder head includes a high-pressure chamber 1, an exhaust chamber 2, a muffler head mounting seat 11, and four mounting parts 4. The high-pressure chamber 1 and the exhaust chamber 2 are connected to form a V shape. The inner end faces of the high-pressure chamber 1 and the exhaust chamber 2 are both in contact with the valve plate 3. The area outside the high-pressure chamber 1 and the exhaust chamber 2 has a hollow part, and the valve plate 3 in the hollow part is exposed. The mounting part 4 is provided with a mounting hole 5, and the mounting hole 5 is used to install screws. The inner end face of the mounting part 4 is in contact with the valve plate 3. The mounting part 4 is cylindrical, and the mounting holes 5 correspond to the threaded holes at the four corners of the valve plate 3. The mounting part 4 is connected to the high-pressure chamber 1 and the exhaust chamber 2 through a reinforcing rib 6, and the inner end face of the reinforcing rib 6 is also in contact with the valve plate 3. The muffler head mounting seat 11 includes a pair of symmetrically arranged vertical plates and an outer baffle. The vertical plates are integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. The vertical plates are perpendicular to the valve plate 3, and the inner side of the vertical plates faces the valve plate 3. The outer baffle is connected to the outer side of the vertical plates and is integrally formed with the two vertical plates, so that the muffler head mounting seat 11 forms a semi-closed structure. The muffler head 10 is installed in the muffler head mounting seat 11. The inner side surface of the muffler head mounting seat 11 is flush with the inner end surfaces of the high-pressure chamber 1 and the exhaust chamber 2. After the cylinder head and the valve plate 3 are installed, the inner side surface of the muffler head mounting seat 11 also fits with the surface of the valve plate 3. Sealing rings 7 are provided on the fitting surfaces of the high-pressure chamber 1 and the exhaust chamber 2 and the inner end surfaces of the mounting portion 4 and the valve plate 3. The mounting portion 4, the reinforcing ribs 6, and the muffler head mounting seat 11 are integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. The cylinder head 9 of the compressor corresponds to the cylinder cover via the valve plate 3 , and the cylinder head 9 abuts against the valve plate 3 . The valve plate 3 is provided with a passage connecting the cylinder head 9 and the high-pressure chamber 1 and the muffler head 10 .

[0031] When installing the hollow cylinder head and the valve plate 3, the mounting holes 5 of the mounting part 4 are matched one by one with the threaded holes on the valve plate 3, and screws are inserted into the mounting holes 5 and screwed into the threaded holes to tighten. Use a torque wrench to tighten the screws. When the compressor is working, the gas is sucked in from the muffler head 10, passes through the channel on the valve plate 3 and enters the cylinder head 9, and then passes through the valve plate 3 from the cylinder head 9 to enter the high-pressure chamber 1. After being compressed in the high-pressure chamber 1, it passes through the exhaust chamber 2 and then passes through the valve plate 3 to enter the cylinder head 9. The utility model improves the structure of the traditional cylinder head, reduces the volume of the high-pressure chamber 1 of the cylinder head, and hollows out the rest of the part. The hollow design of the cylinder head can increase the heat dissipation capacity and prevent excessive heat from being transferred to the valve plate 3 and accumulating in the cylinder head 9. The hollow design also connects the high-pressure chamber 1 and the mounting portion 4 of the cylinder head through the reinforcing rib 6, which changes the large-area integral structure of the traditional cylinder head. After the screws around the cylinder head are tightened, the reduced high-pressure chamber combined with the reinforcing ribs connecting the mounting portion and the high-pressure chamber can improve the deformation resistance of the cylinder head itself and improve the sealing effect of the cylinder head. After the cylinder head and the valve plate 3 are installed, the sealing ring 7 also helps to achieve a better sealing effect. The hollow design of the cylinder head of the utility model reduces the high-pressure chamber 1, which is conducive to faster discharge of gas from the high-pressure chamber 1 to the cylinder head. The rest is the same as Example 1.

[0032] Embodiment 3:

[0033] like Figure 7As shown, a hollow cylinder head is installed on a valve plate 3. The valve plate 3 is a rounded rectangular shape, and threaded holes are provided at the four corners of the valve plate 3. The hollow cylinder head includes a high-pressure chamber 1, an exhaust chamber 2, a muffler head mounting seat 11 and four mounting parts 4. The high-pressure chamber 1 and the exhaust chamber 2 are connected in a V shape. The inner end faces of the high-pressure chamber 1 and the exhaust chamber 2 are both in contact with the valve plate 3. The area outside the high-pressure chamber 1 and the exhaust chamber 2 has a hollow part, and the valve plate 3 in the hollow part is exposed. The mounting part 4 is provided with a mounting hole 5, and the mounting hole 5 is used to install screws. The inner end face of the mounting part 4 is in contact with the valve plate 3. The mounting part 4 is cylindrical, and the mounting holes 5 correspond to the threaded holes at the four corners of the valve plate 3. The mounting part 4 is connected to the high-pressure chamber 1 and the exhaust chamber 2 through a reinforcing rib 6, and the inner end face of the reinforcing rib 6 is also in contact with the valve plate 3. The muffler head mounting seat 11 includes a pair of symmetrically arranged vertical plates and an outer baffle. The vertical plates are integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. The vertical plates are perpendicular to the valve plate 3, and the inner side of the vertical plates faces the valve plate 3. The outer baffle is connected to the outer side of the vertical plates and is integrally formed with the two vertical plates, so that the muffler head mounting seat 11 forms a semi-closed structure. The muffler head 10 is installed in the muffler head mounting seat 11. The inner side surface of the muffler head mounting seat 11 is flush with the inner end surfaces of the high-pressure chamber 1 and the exhaust chamber 2. After the cylinder head and the valve plate 3 are installed, the inner side surface of the muffler head mounting seat 11 also fits with the surface of the valve plate 3. Sealing rings 7 are provided on the fitting surfaces of the high-pressure chamber 1 and the exhaust chamber 2 and the inner end surfaces of the mounting portion 4 and the valve plate 3. The mounting portion 4, the reinforcing ribs 6, and the muffler head mounting seat 11 are integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. The cylinder head 9 of the compressor corresponds to the cylinder head through the valve plate 3, the cylinder head 9 abuts against the valve plate 3, and the valve plate 3 is provided with a channel connecting the cylinder head 9 and the high-pressure chamber 1 and the muffler head 10. The mounting parts 4 are connected by reinforcing ribs 8. The reinforcing ribs 8 are integrally formed with the mounting parts 4. The rest is the same as in Example 2.

[0034] When installing the hollow cylinder head and the valve plate 3, the mounting holes 5 of the mounting part 4 are matched one by one with the threaded holes on the valve plate 3, and screws are inserted into the mounting holes 5 and screwed into the threaded holes to tighten. Use a torque wrench to tighten the screws. When the compressor is working, the gas is sucked in from the muffler head 10, passes through the channel on the valve plate 3 and enters the cylinder head 9, and then passes through the valve plate 3 from the cylinder head 9 to enter the high-pressure chamber 1. After being compressed in the high-pressure chamber 1, it passes through the exhaust chamber 2 and then passes through the valve plate 3 to enter the cylinder head 9. The utility model improves the structure of the traditional cylinder head, reduces the volume of the high-pressure chamber 1 of the cylinder head, and hollows out the rest of the part. The hollow design of the cylinder head can increase the heat dissipation capacity and prevent excessive heat from being transferred to the valve plate 3 and accumulating in the cylinder head 9. The hollow design also connects the high-pressure chamber 1 and the mounting portion 4 of the cylinder head through the reinforcing rib 6, which changes the large-area integral structure of the traditional cylinder head. After the screws around the cylinder head are tightened, the reduced high-pressure chamber combined with the reinforcing ribs connecting the mounting portion and the high-pressure chamber can improve the deformation resistance of the cylinder head itself and improve the sealing effect of the cylinder head. After the cylinder head and the valve plate 3 are installed, the sealing ring 7 also helps to achieve a better sealing effect. The hollow design of the cylinder head of the utility model reduces the high-pressure chamber 1, which is conducive to faster discharge of gas from the high-pressure chamber 1 to the cylinder head.

[0035] Embodiment 4:

[0036] A hollow cylinder head is installed on a valve plate 3. The valve plate 3 is a rounded rectangular shape, and threaded holes are provided at the four corners of the valve plate 3. The hollow cylinder head includes a high-pressure chamber 1, an exhaust chamber 2, a muffler head mounting seat 11, and four mounting parts 4. The high-pressure chamber 1 and the exhaust chamber 2 are connected to form a V shape. The inner end faces of the high-pressure chamber 1 and the exhaust chamber 2 are both in contact with the valve plate 3. The area outside the high-pressure chamber 1 and the exhaust chamber 2 has a hollow part, and the valve plate 3 in the hollow part is exposed. The mounting part 4 is provided with a mounting hole 5, and the mounting hole 5 is used to install screws. The inner end face of the mounting part 4 is in contact with the valve plate 3. The mounting part 4 is cylindrical, and the mounting holes 5 correspond to the threaded holes at the four corners of the valve plate 3. The mounting part 4 is connected to the high-pressure chamber 1 and the exhaust chamber 2 through a reinforcing rib 6, and the inner end face of the reinforcing rib 6 is also in contact with the valve plate 3. The muffler head mounting seat 11 is a cylindrical body with a rounded rectangular cross section. The axis of the muffler head mounting seat 11 is parallel to the valve plate 3. The muffler head mounting seat 11 is integrally formed with the high-pressure chamber 1 and the exhaust chamber 2. One end of the muffler head mounting seat 11 is a closed end and the other end is an open end. The closed end is connected to the high-pressure chamber 1 and the exhaust chamber 2. The muffler head 10 is installed in the muffler head mounting seat 11, and the muffler head 10 is installed from the open end of the muffler head mounting seat 11. The inner side surface of the muffler head mounting seat 11 is slightly higher than the inner end surface of the high-pressure chamber 1 and the exhaust chamber 2. Therefore, after the cylinder head and the valve plate 3 are installed, there is a gap between the inner side surface of the muffler head mounting seat 11 and the surface of the valve plate 3. The high-pressure chamber 1 and the exhaust chamber 2 and the inner end surface of the mounting portion 4 and the fitting surface of the valve plate 3 are all provided with a sealing ring 7. The mounting portion 4, the reinforcing rib 6, the muffler head mounting seat 11, the high-pressure chamber 1 and the exhaust chamber 2 are integrally formed. The cylinder head 9 of the compressor corresponds to the cylinder cover through the valve plate 3, the cylinder head 9 abuts against the valve plate 3, and the valve plate 3 is provided with a channel connecting the cylinder head 9 and the high-pressure chamber 1 and the muffler head 10. The rest is the same as in the first embodiment.

Claims

1. A hollow cylinder head, mounted on a valve plate (3), characterized in that: It comprises a high-pressure chamber (1) and an exhaust chamber (2), wherein the high-pressure chamber (1) and the exhaust chamber (2) are connected, and an area outside the high-pressure chamber (1) and the exhaust chamber (2) has a hollow portion, and a valve plate (3) in the hollow portion is exposed.

2. The hollow cylinder head according to claim 1, characterized in that: It also comprises a plurality of mounting parts (4), each of which is provided with a mounting hole (5), an inner end surface of the mounting part (4) is in contact with the valve plate (3), and the mounting part (4) is connected to the high-pressure chamber (1) and the exhaust chamber (2) via reinforcing ribs (6).

3. The hollow cylinder head according to claim 2, characterized in that: The inner end surface of the reinforcing rib (6) is also in contact with the valve plate (3).

4. The hollow cylinder head according to claim 3 is characterized in that: Sealing rings (7) are provided on the high-pressure chamber (1), the exhaust chamber (2), and the inner end surface of the mounting portion (4) and the contact surface of the valve plate (3).

5. The hollow cylinder head according to claim 2, characterized in that: A gap is left between the inner end surface of the reinforcing rib (6) and the valve plate (3).

6. The hollow cylinder head according to claim 2, characterized in that: The mounting portion (4) and the reinforcing rib (6) are integrally formed with the high-pressure chamber (1) and the exhaust chamber (2).

7. The hollow cylinder head according to any one of claims 2 to 6, characterized in that: The mounting parts (4) are connected via reinforcing ribs (8).

8. The hollow cylinder head according to claim 7, characterized in that: The reinforcing rib (8) is integrally formed with the mounting portion (4).

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