CN112727625A - Cylinder block and engine - Google Patents
Cylinder block and engine Download PDFInfo
- Publication number
- CN112727625A CN112727625A CN202110027180.2A CN202110027180A CN112727625A CN 112727625 A CN112727625 A CN 112727625A CN 202110027180 A CN202110027180 A CN 202110027180A CN 112727625 A CN112727625 A CN 112727625A
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- Prior art keywords
- hole
- engine
- cylinder
- cylinder block
- pressure reducing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a cylinder block and an engine, wherein at least one pressure reducing hole is formed in a cylinder hole of the cylinder block, so that the compression resistance of a piston is reduced when the engine is started; the pressure reducing hole is formed in the cylinder body, so that the compression resistance of the piston can be reduced when the engine is started, and the starting is facilitated; the cylinder body is arranged on the engine, so that the cost of the driving equipment is reduced, the weight of the driving equipment is reduced, the structural compactness of the engine is improved, the overall weight of the engine is reduced, the requirement on lightweight design of the engine is met, and the working reliability and market competitiveness of the engine are improved.
Description
Technical Field
The invention relates to the field of engines, in particular to a cylinder block and an engine.
Background
When the engine is started, the crankshaft of the engine must be rotated by external force to enable the piston to start to reciprocate up and down, and the engine can automatically enter a working cycle after the starting rotating speed is reached; in the prior art, the common starting modes of the engine include manual starting, auxiliary gasoline engine starting, motor starting and other starting modes, and no matter which starting mode is adopted, the resistance of a compression cylinder and the friction resistance between related moving parts when a piston moves upwards need to be overcome, so that when the engine is started, a larger torque needs to be provided for the engine, and a large-power external driving device (the external driving device such as the manual starting, the auxiliary gasoline engine starting, the motor starting and the like) needs to be provided for the larger torque, so that the weight and the production cost of the engine are increased.
The cylinder body is used as a heavy part of the engine, not only has direct effect on resistance when the piston is compressed, but also has the effect of installing external driving equipment; when the engine is started, the resistance generated by piston compression is too large, the power of external driving equipment needs to be increased, and the weight of the external driving equipment is increased, so that the bearing weight of the engine is increased, the weight of the cylinder body is increased, the production and manufacturing cost is increased, the structure compactness is reduced, and the market competitiveness is reduced.
Therefore, in order to solve the above problems, there is a need for a cylinder block capable of reducing the compression resistance of a piston at the time of engine start, thereby reducing the power of an external driving device, improving the compactness, and reducing the manufacturing cost.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the drawbacks of the prior art, and to provide a cylinder block capable of reducing the compression resistance of a piston when an engine is started, thereby reducing the power of an external driving device, improving the compactness, and reducing the manufacturing cost.
The cylinder block of the invention is provided with at least one decompression hole communicated with a cylinder hole of the cylinder block and used for reducing the compression resistance of a piston when an engine is started; by providing the pressure reducing hole, the compression resistance of the piston can be reduced when the engine is started, thereby facilitating the starting.
Further, the decompression hole is communicated between a cylinder hole of the cylinder block and an exhaust passage of the engine; the pressure reducing hole is communicated between the cylinder hole of the cylinder body and the exhaust passage of the engine, so that exhaust gas is directly exhausted through the exhaust passage, the structure compactness is improved, and an exhaust passage is avoided being additionally arranged.
Further, the cylinder block is a two-stroke engine cylinder block, and the pressure reducing hole is formed in a cylinder hole wall at the top of a cylinder hole of the cylinder block; through with the cylinder hole wall at cylinder hole top is seted up to the pressure-reducing vent, when the piston compression, can not only reduce piston compression resistance, still be convenient for manufacturing.
Further, the cylinder body is provided with a middle through hole for communicating the pressure reducing hole to the exhaust passage; through setting up in the middle of the via hole connection pressure release hole and exhaust passage, can not only guarantee that the gas in the pressure release hole can be discharged the exhaust passage through middle via hole in, still reduced the processing degree of difficulty of pressure release hole simultaneously.
Further, the pressure reducing hole is a straight hole, and an included angle alpha between the pressure reducing hole and the axis of the cylinder hole is 10-90 degrees; the pressure reducing holes are straight holes, so that the gas circulation is facilitated, and the processing is facilitated; the included angle alpha is set to be 10-90 degrees, so that the pressure reducing hole is convenient to process, the resistance in gas circulation can be reduced, and compressed gas is convenient to discharge from the pressure reducing hole to play a pressure reducing role when the piston moves upwards.
Further, the ratio of the diameter of the pressure reduction hole to the diameter of the cylinder hole is 0.0446-0.0447; by adopting the ratio range, the resistance of piston compression can be reduced by smooth discharge of gas in the process of piston compression, and meanwhile, the power can not be reduced, so that the problem that the exhaust is not smooth due to too small diameter of a pressure reducing hole is avoided, the resistance of the piston is larger, and the problem that the power is smaller due to too large diameter of the pressure reducing hole is also avoided.
Further, the flow area of the intermediate via hole is larger than the flow area of the pressure relief hole; by adopting the structure, when the piston is compressed, the piston compression resistance is reduced by being beneficial to the discharge of gas, thereby avoiding unsmooth gas circulation caused by the undersize flow area of the middle through hole and being convenient for processing the middle through hole.
Furthermore, the middle through hole is a straight hole and forms a set included angle beta with the pressure reducing hole; through inciting somebody to action the centre via hole sets up to the straight hole to reduce gaseous circulation resistance, not only be favorable to gaseous circulation, can also be favorable to processing simultaneously.
The included angle beta between the middle through hole and the pressure reducing hole is 30-60 degrees; the included angle beta is set to be 30-60 degrees, so that the gas in the pressure reducing hole can flow into the middle through hole, and meanwhile, the middle through hole can be conveniently processed, the problem that the length of the middle through hole is increased due to the fact that the set angle beta is too small, the structure is compact is avoided, processing is not facilitated, and the problem that the gas cannot smoothly flow at the connection position of the pressure reducing hole and the middle through hole due to the fact that the set angle beta is too large is also avoided.
Furthermore, a reinforcing rib is arranged on the cylinder body, and the middle through hole is arranged in the reinforcing rib; through setting up the stiffening rib, not only provide the position of setting up for middle via hole to increased the scope of seting up of middle via hole, reduced the processing degree of difficulty of middle via hole, simultaneously, still increased the structural strength of cylinder block.
The invention also discloses an engine, wherein the engine is provided with the cylinder body; by installing the cylinder block, when the engine is started, the driving torque of the rotation of the crankshaft can be further reduced, so that the engine is convenient to start, the power of driving equipment (external driving equipment such as a pull disc, an auxiliary gasoline engine, a motor and the like) is reduced, the crankshaft can also be driven to rotate, the cost of the driving equipment is reduced, the weight of the driving equipment is also reduced, the structural compactness of the engine is improved, the overall weight of the engine is reduced, the requirement on the lightweight design of the engine is met, and the working reliability and market competitiveness of the engine are improved.
The invention has the beneficial effects that: according to the cylinder body disclosed by the invention, the pressure reducing hole is formed in the cylinder body, so that the compression resistance of the piston can be reduced when the engine is started, and the cylinder body is convenient to start and has the advantages of simple structure and convenience in production and manufacturing; by mounting the cylinder block on the engine, the power of driving equipment of the engine can be reduced, so that the weight of the engine is reduced, the compactness is increased, and the production cost is reduced.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is an isometric view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
fig. 4 is an enlarged view of the point i in fig. 3.
Detailed Description
FIG. 1 is a schematic axial view, FIG. 2 is a schematic structural view, FIG. 3 is a sectional view taken along line A-A of FIG. 2, and FIG. 4 is an enlarged view taken at point I of FIG. 3; as shown in the figure, the cylinder block 1 of the present embodiment is provided with at least one decompression hole 12 for reducing the compression resistance of the piston at the time of engine start, in communication with a cylinder hole 11 of the cylinder block; by arranging the pressure reducing hole 12, when the engine is started, the compression resistance of the piston can be reduced, so that the starting is facilitated; the pressure reducing hole 12 can be opened on the cylinder body or the cylinder head and can be arranged according to specific requirements; the number of the pressure reducing holes 12 can be one or more, and can be set according to specific requirements; when the engine is started at a low rotating speed, the rotating speed of the crankshaft is low, the upward and downward moving speeds of the piston are low, when the piston moves upward, gas in the cylinder is compressed, and part of the gas can be discharged through the pressure reducing hole, so that the compression resistance of the piston is reduced, and the crankshaft can drive the piston to operate under a small starting torque; after the engine is normally started, the rotating speed of the crankshaft is increased, the upward and downward moving speeds of the piston are also increased, and when the piston moves upward, only a small amount of gas compressed in the cylinder can be exhausted out of the cylinder through the pressure reducing hole, so that the influence on the working performance of the engine under normal working is small.
In the present embodiment, the decompression hole 12 communicates between the cylinder hole 11 of the cylinder block and the exhaust passage 14 of the engine; the pressure reducing hole 12 is one, and only one pressure reducing hole is formed, so that the resistance of the piston during compression can be reduced during the compression of the piston, and the normal power of the engine can be ensured not to be influenced during the normal work of the engine, and the pressure reducing hole 12 is communicated between the cylinder hole 11 of the cylinder body and the exhaust passage 14 of the engine, so that the exhausted gas is directly exhausted through the exhaust passage 14, the structure compactness is improved, and an exhaust passage is avoided being additionally arranged; the pressure reducing hole 12 can be directly communicated with the exhaust passage 14, or a middle through hole can be added between the pressure reducing hole and the exhaust passage for communication, and can be selected according to specific requirements, and is not described herein again; for a two-stroke engine, the exhaust passage is arranged on the cylinder block, for a four-stroke engine, the exhaust passage is arranged on the cylinder head, and the specific arrangement of the exhaust passage is the prior art and is not described again.
In the present embodiment, the cylinder block 1 is a two-stroke engine cylinder block 1, and the decompression hole 12 is opened in a cylinder bore wall at a cylinder bore top of the cylinder block; by arranging the pressure reducing hole 12 on the wall of the cylinder hole at the top of the cylinder hole, when the piston is compressed, the compression resistance of the piston can be reduced, and the processing and the manufacturing are facilitated; the top of the cylinder hole is one end of the cylinder hole 12, which is close to the cylinder body and is connected with the cylinder head along the axis direction of the cylinder hole; the arrangement of the cylinder hole (the cylinder hole can be directly arranged on the cylinder block, and can also be arranged by embedding a cylinder sleeve) is the prior art, and is not described in detail herein.
In the embodiment, the cylinder block is provided with a middle through hole 13 for communicating the pressure reducing hole 12 to the exhaust passage 14; the intermediate through hole 13 is arranged to connect the pressure reducing hole 12 and the exhaust passage 14, so that gas in the pressure reducing hole 12 can be exhausted into the exhaust passage 14 through the intermediate through hole 13, and the processing difficulty of the pressure reducing hole is reduced; the number of the intermediate through holes 13 can be one or more, and one intermediate through hole is optionally arranged, so that the structural strength of the cylinder body can be ensured when gas in the pressure reducing hole can be smoothly discharged, and the structural strength of the cylinder body is prevented from being reduced due to the arrangement of too many intermediate through holes.
In this embodiment, the pressure reducing hole 12 is a straight hole, and an included angle α between the pressure reducing hole and the axis of the cylinder hole 11 is 10 ° to 90 °; the pressure reducing holes are straight holes, so that the gas circulation is facilitated, and the processing is facilitated; one end of the pressure reducing hole is arranged on the wall of the air cylinder, the other end of the pressure reducing hole faces one side of the exhaust passage, compressed air can conveniently flow to the exhaust passage, the included angle alpha is set to be 10-90 degrees, the pressure reducing hole can be conveniently machined, resistance in air flowing can be reduced, and compressed air can be conveniently discharged from the pressure reducing hole to play a role in reducing pressure when the piston moves upwards; the included angle alpha is set to be between 10 degrees and 90 degrees, so that the problem that the processing difficulty is increased and the structure compactness is increased due to the fact that the included angle alpha is too small and too large is avoided, 60 degrees is preferably selected for the included angle alpha, the processing and the manufacturing are facilitated, the structure compactness is improved, and of course, other angles alpha in the range of 10 degrees to 90 degrees can be selected for use, and further description is omitted.
In the embodiment, the ratio of the diameter of the pressure reducing hole to the diameter of the cylinder hole is 0.0446-0.0447; by adopting the ratio range, the resistance of piston compression can be reduced by successfully discharging gas when the piston is compressed, and the power can not be reduced, so that the problems of unsmooth exhaust and larger piston resistance caused by too small diameter of a pressure reducing hole are avoided, and the problem of smaller power caused by too large diameter of the pressure reducing hole is also avoided; the preferred ratio is 0.04464, the diameter of the cylinder hole is 56mm in this example, the diameter of the pressure reducing hole is 2.5mm, so that the exhaust can be well satisfied to reduce the compression resistance of the piston, and the power of the engine can not be reduced; of course, any proportion of 0.0446-0.0447 can be selected, and will not be described in detail herein.
In this embodiment, the flow area of the intermediate via hole 13 is larger than the flow area of the pressure relief hole 12; by adopting the structure, when the piston is compressed, the piston compression resistance is reduced by being beneficial to the discharge of gas, thereby avoiding unsmooth gas circulation caused by the undersize flow area of the middle through hole and being convenient for processing the middle through hole.
In this embodiment, the middle via hole 13 is a straight hole and forms a set included angle β with the pressure reducing hole 12; the middle through hole is set to be a straight hole, so that the flow resistance of gas is reduced, the gas can flow conveniently, and the processing is facilitated; the fact that the middle through hole and the pressure reducing hole form a set included angle beta means that a set included angle beta is formed between the axis of the middle through hole and the axis of the pressure reducing hole.
The included angle beta between the middle through hole 13 and the pressure reducing hole 12 is 30-60 degrees; the included angle beta is set to be 30-60 degrees, so that the gas in the pressure reducing hole can flow into the middle through hole conveniently, and the middle through hole can be processed conveniently, so that the situation that the length of the middle through hole is increased due to the fact that the set angle beta is too small, the structure is compact is avoided, the processing is not facilitated, and the situation that the gas flows unsmooth at the connection position of the pressure reducing hole and the middle through hole due to the fact that the set angle beta is too large is avoided; the included angle beta is preferably 45 degrees, which can simultaneously ensure smooth gas circulation, increase the structural compactness and facilitate processing, and other angles of 30-60 degrees can be adopted, which is not described herein again.
In this embodiment, the cylinder block is further provided with a reinforcing rib 15, and the intermediate via hole 13 is arranged in the reinforcing rib 15; by arranging the reinforcing ribs, the arrangement position is provided for the middle through hole 13, so that the arrangement range of the middle through hole 13 is increased, the processing difficulty of the middle through hole is reduced, and meanwhile, the structural strength of the cylinder body is increased; the reinforcing ribs are triangular reinforcing ribs arranged on the outer sides of the cylinder hole of the cylinder body and the exhaust port of the cylinder body, the reinforcing effect of the reinforcing ribs can be improved by adopting the triangular reinforcing ribs, and rectangular rib plates, arc rib plates or rib plates in other shapes can be arranged according to the specific structure of the cylinder body, so that the details are not repeated.
One end of the middle through hole 13, which is far away from the exhaust passage 14, is also provided with a sealing thread 131, and the sealing thread 131 can be matched with a thread plug for sealing, so that the gas entering the middle through hole can only be exhausted from the exhaust passage; of course, the sealing can be performed by interference fit or other sealing methods, which are not described herein; the structure of the threaded plug is the prior art, and is not described in detail herein.
The invention also discloses an engine, wherein the engine is provided with the cylinder body 1; by installing the cylinder block, when the engine is started, the driving torque of the rotation of the crankshaft can be further reduced, so that the engine is convenient to start, the power of driving equipment (external driving equipment such as a pull disc, an auxiliary gasoline engine, a motor and the like) is reduced, the crankshaft can also be driven to rotate, the cost of the driving equipment is reduced, the weight of the driving equipment is also reduced, the structural compactness of the engine is improved, the overall weight of the engine is reduced, the requirement on the lightweight design of the engine is met, and the working reliability and market competitiveness of the engine are improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A cylinder block characterized in that: at least one decompression hole for reducing compression resistance of the piston at the time of engine start is provided in communication with the cylinder hole of the cylinder block.
2. The cylinder block according to claim 1, characterized in that: the decompression hole is communicated between a cylinder hole of the cylinder body and an exhaust passage of the engine.
3. The cylinder block according to claim 2, characterized in that: the cylinder block is a two-stroke engine cylinder block, and the pressure reducing hole is formed in the wall of a cylinder hole at the top of a cylinder hole of the cylinder block.
4. The cylinder block according to claim 3, characterized in that: the cylinder body is provided with a middle through hole for communicating the pressure reducing hole to the exhaust passage.
5. The cylinder block according to claim 3, characterized in that: the pressure reducing hole is a straight hole, and the included angle between the pressure reducing hole and the axis of the cylinder hole is 10-90 degrees.
6. The cylinder block according to claim 5, characterized in that: the ratio of the diameter of the pressure reduction hole to the diameter of the cylinder hole is 0.0446-0.0447.
7. The cylinder block according to claim 4, characterized in that: the flow area of the intermediate via hole is larger than the flow area of the pressure relief hole.
8. The cylinder block according to claim 7, characterized in that: the middle through hole is a straight hole and forms a set included angle beta with the pressure reducing hole;
the included angle beta between the middle through hole and the pressure reducing hole is 30-60 degrees.
9. The cylinder block according to claim 8, characterized in that: the cylinder body is further provided with a reinforcing rib, and the middle through hole is formed in the reinforcing rib.
10. An engine, characterized in that: the engine is equipped with the cylinder block defined in any one of claim 1 through claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110027180.2A CN112727625A (en) | 2021-01-09 | 2021-01-09 | Cylinder block and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110027180.2A CN112727625A (en) | 2021-01-09 | 2021-01-09 | Cylinder block and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112727625A true CN112727625A (en) | 2021-04-30 |
Family
ID=75590046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110027180.2A Pending CN112727625A (en) | 2021-01-09 | 2021-01-09 | Cylinder block and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112727625A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204704019U (en) * | 2015-05-15 | 2015-10-14 | 秦建法 | A kind of cylinder with automatic pressure reducing function |
| JP2016138482A (en) * | 2015-01-27 | 2016-08-04 | 三菱重工業株式会社 | Cylinder structure and piston engine |
| CN106762322A (en) * | 2016-11-30 | 2017-05-31 | 河北华北柴油机有限责任公司 | Diesel engine quick starts structure and method |
| JP2019127837A (en) * | 2018-01-22 | 2019-08-01 | トヨタ自動車株式会社 | Processing method of cylinder bore |
| CN212054920U (en) * | 2020-05-27 | 2020-12-01 | 重庆宗申航空发动机制造有限公司 | Engine and in-cylinder pressure relief structure thereof |
-
2021
- 2021-01-09 CN CN202110027180.2A patent/CN112727625A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016138482A (en) * | 2015-01-27 | 2016-08-04 | 三菱重工業株式会社 | Cylinder structure and piston engine |
| CN204704019U (en) * | 2015-05-15 | 2015-10-14 | 秦建法 | A kind of cylinder with automatic pressure reducing function |
| CN106762322A (en) * | 2016-11-30 | 2017-05-31 | 河北华北柴油机有限责任公司 | Diesel engine quick starts structure and method |
| JP2019127837A (en) * | 2018-01-22 | 2019-08-01 | トヨタ自動車株式会社 | Processing method of cylinder bore |
| CN212054920U (en) * | 2020-05-27 | 2020-12-01 | 重庆宗申航空发动机制造有限公司 | Engine and in-cylinder pressure relief structure thereof |
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Application publication date: 20210430 |