CN218093177U - Engine - Google Patents

Abstract

The application relates to the technical field of power systems, in particular to an engine. The engine comprises a shell assembly, a crank connecting rod mechanism and a gas distribution mechanism, wherein the shell assembly comprises a cylinder body and a crankcase; the crank connecting rod mechanism is at least partially arranged on the crankcase; the valve actuating mechanism is at least partially positioned in the crankcase and comprises a camshaft structure and a timing transmission structure, one end of the timing transmission structure is sleeved on at least part of the crank connecting rod mechanism, and the other end of the timing transmission structure is sleeved on at least part of the camshaft structure; the timing transmission structure comprises a timing chain and a tensioner, and the timing chain is respectively wound on the camshaft structure and the crank link mechanism; the tensioning device comprises a tensioning shell, wherein the outer side of the tensioning shell is provided with a tightening thread, and at least part of the tensioning shell penetrates through the cylinder body and is in threaded connection with the cylinder body through the tightening thread. Therefore, the tensioner is convenient to mount and dismount, the assembly time of the tensioner is saved, the cost is reduced, and the weight is reduced.

Description

Engine

Technical Field

The application relates to the technical field of power systems, in particular to an engine.

Background

An engine is a machine capable of converting other forms of energy into mechanical energy, and functions to provide the power required for the operation of a vehicle.

The existing engine comprises a crank connecting rod mechanism, a timing transmission structure and a camshaft structure, wherein the timing transmission structure is respectively connected with the crank connecting rod mechanism and the camshaft structure, the crank connecting rod mechanism rotates to drive the timing transmission structure to move, and the timing transmission structure drives the camshaft structure to rotate, so that air intake and exhaust of the engine are realized.

The timing transmission structure comprises a timing chain and a tensioner, the timing chain is wound on the crank connecting rod mechanism and the camshaft structure respectively, and the tensioner is installed on a cylinder body of an engine through parts such as bolts and flange plates and used for adjusting the tension of the timing chain.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides an engine which can conveniently tension a timing chain.

In order to achieve the above object, the utility model adopts the following technical scheme: an engine, comprising: the shell assembly comprises a cylinder body and a crankcase; the crank connecting rod mechanism is at least partially arranged on the crankcase; the valve actuating mechanism is at least partially positioned in the crankcase and comprises a camshaft structure and a timing transmission structure, one end of the timing transmission structure is sleeved on at least part of the crank-link mechanism, and the other end of the timing transmission structure is sleeved on at least part of the camshaft structure; the timing drive structure includes: the timing chain is respectively wound on the camshaft structure and the crank connecting rod mechanism; the tensioner comprises a tensioning shell, wherein a tightening thread is arranged on the outer side of the tensioning shell, and at least part of the tensioning shell penetrates through the cylinder body and is in threaded connection with the cylinder body through the tightening thread.

Further, the length of the tightening thread in the axial direction of the tension housing is L1, the length of the tension housing is L2, and L1/L2 is greater than or equal to 0.15 and less than or equal to 0.35.

Further, the tension housing includes: the connecting section is screwed on the outer peripheral side of the connecting section, penetrates through the cylinder body and is in threaded connection with the cylinder body; lean on the section, lean on the section to be connected with the linkage segment, and lean on the section to be located the cylinder body outward, and lean on the cylinder body.

Further, the connecting section and the abutting section are integrally formed.

Further, the tensioner further comprises: one end of the tensioning assembly extends into the tensioning shell, and the other end of the tensioning assembly abuts against the timing chain.

The tensioning assembly is at least partially arranged in the first accommodating groove, one end of the first inner oil duct is communicated with the engine main oil duct, the other end of the first inner oil duct is communicated with the second inner oil duct, and the second inner oil duct is respectively communicated with the first inner oil duct and the first accommodating groove; the engine oil in the main oil gallery of the engine can flow into the second inner oil gallery through the first inner oil gallery and then flow into the first accommodating groove so as to push the tensioning assembly to move.

Further, the tensioning assembly comprises: the one-way valve unit is arranged in the first accommodating groove; one end of the plunger is positioned in the first accommodating groove, the other end of the plunger abuts against the timing chain, the plunger is provided with a second accommodating groove, and the second accommodating groove is communicated with the first accommodating groove; the oil control disc is positioned in the second accommodating groove and abuts against the plunger; plunger spring, plunger spring housing locate at least some accuse food tray, and plunger spring's one end supports and leans on in the check valve unit, and plunger spring's the other end supports and leans on controlling the food tray.

Furthermore, a high-pressure chamber is formed between the one-way valve unit and the plunger, and an oil drainage channel is also formed at one end of the plunger close to the timing chain; the high-pressure chamber is communicated with the oil drainage channel through the oil control disc.

Further, the timing drive structure further includes: the tensioning plate is at least partially located in the cylinder body, and the tensioning plate is located between the tensioner and the timing chain and is connected with the timing chain.

Further, the timing drive structure further includes: the guide plate is at least partially positioned in the cylinder body and connected with the cylinder body, and the guide plate is positioned on one side, far away from the tensioning plate, of the timing chain and connected with the timing chain.

Compared with the prior art, the tensioner of the engine provided by the application is connected with the cylinder body through the screwing thread, so that the tensioner is convenient to mount and dismount, the assembly time of the tensioner is saved, and the cost is reduced. The tensioner is prevented from being installed on the cylinder body through the existing parts such as bolts and flange plates, the structure is complex, and the installation process is complex. And, through screwing up threaded connection can also reduce the space that installation tensioning ware took, reduce the weight of timing drive structure.

Drawings

Fig. 1 is a schematic structural diagram of an engine provided in the present application.

Fig. 2 is a sectional view of a portion of the engine structure provided in the present application.

Fig. 3 is a partial structural schematic diagram of a valve train and a cylinder block provided in the present application.

Fig. 4 is a schematic partial structural diagram of a valve train and a cylinder block provided by the present application.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is a schematic structural view of the tensioner provided herein.

Fig. 7 is a cross-sectional view of fig. 6.

Fig. 8 is a schematic diagram of an internal engine portion configuration provided herein.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

For clarity in illustrating the structure of the engine 100, the present application defines the front, rear, upper, lower, left, and right sides of the engine 100 in fig. 1. The engine 100 is a device that powers a vehicle and is capable of converting other forms of energy into mechanical energy to ensure stable operation of the vehicle.

Referring to fig. 1, an engine 100 includes a housing assembly 10, the housing assembly 10 including a cylinder head cover 11, a cylinder head 12, a cylinder block 13, and a crankcase 14. A cylinder cover 11 is provided to cover the cylinder head 12 and is connected to the cylinder head 12, and the cylinder cover 11 serves to cover and seal the cylinder head 12, to retain lubricating oil inside the engine 100, and to insulate dirt, moisture, and the like from the outside of the engine 100. The end of the cylinder head 12 far away from the cylinder cover 11 is connected with the cylinder block 13, and the cylinder head 12 is connected with the cylinder block 13 to seal gas and form a combustion space to bear high-temperature and high-pressure fuel gas. The end of the cylinder block 13 remote from the cylinder head 12 is connected to a crankcase 14.

Referring to fig. 2 to 4, the engine 100 further includes a valve train 40 and a crank mechanism 50. The crank mechanism 50 is at least partially mounted within the crankcase 14. The valve train 40 is at least partially located within the crankcase 14 and is connected to a crank linkage 50. The crank linkage 50 is capable of transmitting power to the valve train 40 to move the valve train 40.

The valve train 40 includes a camshaft structure 41 and a timing drive structure 42. The camshaft structure 41 is at least partially installed in the cylinder head 12, one end of the timing transmission structure 42 is sleeved on at least part of the crank link mechanism 50, and the other end of the timing transmission structure 42 is sleeved on at least part of the camshaft structure 41. The rotation of the crank link mechanism 50 can drive the timing transmission structure 42 to move, the timing transmission structure 42 drives the camshaft structure 41 to rotate, and the crank link mechanism 50 transmits power to the camshaft structure 41 through the timing transmission structure 42.

The timing transmission structure 42 includes a timing chain 43 and a tensioner 44. The timing chain 43 is respectively wound on the camshaft structure 41 and the crank link mechanism 50, the crank link mechanism 50 rotates to drive the timing chain 43 to move, and the timing chain 43 drives the camshaft structure 41 to rotate. The tensioner 44 is at least partially installed in the cylinder block 13 and is used for adjusting the tension of the timing chain 43 to keep the timing chain 43 within a preset tension range, so that the tension of the timing chain 43 is ensured, and meanwhile, the abrasion of the timing chain 43 is reduced, thereby prolonging the service life and reducing the maintenance cost.

Referring to fig. 5, the tensioner 44 is at least partially inserted through the cylinder block 13 and is in threaded connection with the inner wall of the cylinder block 13. One end of the tensioner 44 abuts on the timing chain 43, and the other end of the tensioner 44 abuts on the cylinder block 13. By arranging the tensioner 44 to be in threaded connection with the cylinder block 13, the installation and the disassembly of the tensioner 44 are facilitated, the assembly time is saved, and the cost is reduced. The tensioner is prevented from being installed on the cylinder body through the existing parts such as bolts and flange plates, the structure is complex, and the installation process is complex. In addition, the space occupied by the tensioner 44 after installation can be saved through threaded connection, and the weight of the engine 100 is reduced.

Referring to fig. 6 and 7, the tensioner 44 includes a tension housing 441 and a tension assembly 442, a tightening screw 4421 is disposed on an outer side of the tension housing 441, and the tension housing 441 at least partially penetrates through the cylinder block 13 and is in threaded connection with the cylinder block 13 through the tightening screw 4421. The tension assembly 442 is at least partially mounted within the tension housing 441 and is movable in an axial direction of the tension housing 441 to adjust the timing chain 43. One end of the tension unit 442 extends into the tension housing 441, and the other end of the tension unit 442 abuts against the timing chain 43.

The length of the tightening screw 4421 in the axial direction of the tension housing 441 is L1, the length of the tension housing 441 is L2, and L1/L2 is not less than 0.15 and not more than 0.35. In this way, the connection stability of the tensioner 44 and the cylinder block 13 can be ensured, the tensioner 44 is prevented from being separated from the cylinder block 13, the installation and the disassembly of the tensioner 44 are facilitated, the assembly time of the tensioner 44 is saved, and the space occupied by the installation of the tensioner 44 is reduced.

If L1/L2 is less than 0.15, the fastening of the tensioner 44 to the cylinder block 13 is low, the tensioner 44 is easily removed from the cylinder block 13, and the tensioning action of the chain 43 when the tensioner 44 is aligned cannot be achieved. If L1/L2 is greater than 0.35, the tensioner 44 and cylinder block 13 are too costly to machine, wasting material and taking time to install.

The setting of L1/L2 can vary depending on the circumstances, and in one embodiment, L1/L2 is 0.18 or more and 0.3 or less. In another embodiment, L1/L2 is 0.2 or greater and 0.25 or less. With the above arrangement, the firmness of the connection of the tensioner 44 to the cylinder block 13 can be further ensured.

Referring to fig. 7, the tension housing 441 includes a connecting section 4411 and an abutting section 4412. The tightening screw 4421 is provided on the outer peripheral side of the connecting section 4411, one end of the connecting section 4411 is connected to the abutting section 4412, and the other end of the connecting section 4411 is inserted into the cylinder block 13 and is screwed to the cylinder block 13. The abutting section 4412 is located outside the cylinder block 13 and abuts against the cylinder block 13, and the abutting section 4412 is arranged to limit the distance that the connecting section 4411 extends into the cylinder block 13, so that the tensioner 44 can be installed more quickly and conveniently.

In the present embodiment, the connecting section 4411 is integrally formed with the abutting section 4412, which facilitates the machining of the tension housing 441 and saves the assembly time of the tensioner 44, and the abutting section 4412 and the connecting section 4411 do not need to be separately assembled when the tensioner 44 is installed.

Referring to fig. 7 and 8, the engine 100 further includes an engine main oil gallery 17. The tension housing 441 includes a first receiving groove 4413, and the tension assembly 442 is at least partially installed in the first receiving groove 4413. The tensioning housing 441 is provided with a first inner oil passage 4414 and a second inner oil passage 4415, one end of the first inner oil passage 4414 is communicated with the engine main oil passage 17, and the other end of the first inner oil passage 4414 is communicated with the second inner oil passage 4415. The second inner oil passage 4415 communicates with the first inner oil passage 4414 and the first accommodation groove 4413, respectively. The engine oil of the main oil gallery can flow into the second inner oil gallery 4415 through the first inner oil gallery 4414 and then flow into the first accommodating groove 4413, so that the tensioning assembly 442 axially moves to press the tensioning plate 45, and the tensioning force of the timing chain 43 is adjusted.

The tensioning assembly 442 includes a one-way valve unit 443, a plunger spring 445, an oil control disk 446, and a plunger 444. The check valve unit 443 is installed in the first receiving groove 4413, one end of the plunger 444 is located in the first receiving groove 4413, and the other end of the plunger 444 abuts against the tension plate 45. The plunger 444 is formed with a second receiving groove 4443, and the second receiving groove 4443 is communicated with the first receiving groove 4413. The oil control pan 446 is located in the second receiving groove 4443, and the oil control pan 446 abuts against the plunger 444. The plunger spring 445 is sleeved on at least part of the oil control disc 446, one end of the plunger spring 445 is abutted against the one-way valve unit 443, and the other end of the plunger spring 445 is abutted against the oil control disc 446.

Wherein a high pressure chamber 447 is formed between the check valve unit 443 and the plunger 444. The engine oil of the engine main oil gallery 17 enters the first receiving groove 4413 through the first inner oil gallery 4414 and the second inner oil gallery 4415, and when the engine oil pressure is greater than the spring force of the plunger spring 445, the engine oil pushes up the check valve unit 443, the engine oil enters the high-pressure chamber 447, and the plunger 444 is pushed out, so that the plunger 444 moves toward the tension plate 45 in the axial direction of the tension housing 441, thereby pressing the tension plate 45, and adjusting the timing chain 43.

An oil drain passage 4441 is also opened at one end of the plunger 444 near the timing chain 43, and the high-pressure chamber 447 communicates with the oil drain passage 4441 through an oil control pan 446. The oil pan 446 includes labyrinth passages (not shown) that communicate with the high-pressure chamber 447 and the oil release passage 4441, respectively, to regulate the pressure in the high-pressure chamber 447 by continuing oil release.

With reference to fig. 7, the tensioner 44 further includes a locking plate 47, a locking plate groove 4442 is formed on the outer circumference of the plunger 444, and the locking plate 47 is installed in the locking plate groove 4442 to prevent the plunger 444 from extending under the elastic force of the plunger spring 445 during transportation.

The tensioner 44 further includes a first limiting member 48 and a second limiting member 49, and a first installation groove 4416 and a second installation groove 4417 are formed on the groove wall of the first accommodation groove 4413. The first mounting groove 4416 is located on the side of the second mounting groove 4417 away from the timing chain 43. The first position-limiting member 48 is disposed around the plunger 444, and the first position-limiting member 48 is disposed in the first mounting groove 4416. The second limiting member 49 is sleeved on the periphery of the plunger 444, and the second limiting member 49 is located in the second mounting groove 4417. The first stopper 48 and the second stopper 49 can limit the moving distance of the plunger 444 in the axial direction of the tension housing 441.

Referring to fig. 4 and 5, the timing transmission structure 42 further includes a tension plate 45, the tension plate 45 is at least partially located in the cylinder block 13, the tension plate 45 is located between the tensioner 44 and the timing chain 43, and the tension plate 45 is connected to the timing chain 43. One end of the tensioning assembly 442 is located in the tensioning housing 441, and the other end of the tensioning assembly 442 abuts against the tensioning plate 45, so that the tensioning force of the timing chain 43 is adjusted through the matching of the tensioning plate 45, the abrasion of the timing chain 43 is reduced, and the service life is prolonged.

The timing drive structure 42 also includes a guide plate 46, the guide plate 46 being at least partially located within the cylinder block 13 and connected to the cylinder block 13. And the guide plate 46 is located on the side of the timing chain 43 remote from the tension plate 45 and is connected to the timing chain 43. The guide plate 46 guides the movement of the timing chain 43, and the movement of the timing chain 43 is made smoother.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims (10)

1. An engine, comprising:

a housing assembly including a cylinder block and a crankcase;

a crank linkage at least partially mounted to the crankcase;

the valve actuating mechanism is at least partially positioned in the crankcase and comprises a camshaft structure and a timing transmission structure, one end of the timing transmission structure is sleeved on at least part of the crank-link mechanism, and the other end of the timing transmission structure is sleeved on at least part of the camshaft structure;

characterized in that the timing drive structure comprises:

the timing chains are respectively wound on the camshaft structure and the crank link mechanism;

the tensioning device comprises a tensioning shell, wherein a tightening thread is arranged on the outer side of the tensioning shell, and the tensioning shell at least partially penetrates through the cylinder body and is in threaded connection with the cylinder body through the tightening thread.

2. The engine of claim 1, wherein the tightening thread has a length L1 in the axial direction of the tension housing, the tension housing has a length L2, and L1/L2 is 0.15 or more and 0.35 or less.

3. The engine of claim 2, wherein the tension housing comprises:

the tightening screw is arranged on the outer peripheral side of the connecting section, and the connecting section penetrates through the cylinder block and is in threaded connection with the cylinder block;

the abutting section is connected with the connecting section, and the abutting section is located outside the cylinder body and abuts against the cylinder body.

4. The engine of claim 3, wherein the connecting section is integrally formed with the abutting section.

5. The engine of claim 1, wherein the tensioner further comprises:

one end of the tensioning assembly extends into the tensioning shell, and the other end of the tensioning assembly abuts against the timing chain.

6. The engine of claim 5, further comprising an engine main oil gallery, wherein the tensioning housing includes a first receiving slot, a first inner oil gallery and a second inner oil gallery, wherein the tensioning assembly is at least partially mounted in the first receiving slot, wherein one end of the first inner oil gallery is in communication with the engine main oil gallery, wherein the other end of the first inner oil gallery is in communication with the second inner oil gallery, and wherein the second inner oil gallery is in communication with the first inner oil gallery and the first receiving slot, respectively;

the engine oil in the engine main oil gallery can flow into the second inner oil gallery through the first inner oil gallery and then flow into the first accommodating groove to push the tensioning assembly to move.

7. The engine of claim 6, wherein the tensioning assembly comprises:

the one-way valve unit is arranged in the first accommodating groove;

one end of the plunger is located in the first accommodating groove, the other end of the plunger abuts against the timing chain, the plunger is provided with a second accommodating groove, and the second accommodating groove is communicated with the first accommodating groove;

the oil control disc is positioned in the second accommodating groove and abuts against the plunger;

and the plunger spring is sleeved on at least part of the oil control disc, one end of the plunger spring is abutted against the one-way valve unit, and the other end of the plunger spring is abutted against the oil control disc.

8. The engine of claim 7, characterized in that a high-pressure chamber is formed between the check valve unit and the plunger, and a drain passage is opened at one end of the plunger close to the timing chain; the high-pressure chamber is communicated with the oil drainage channel through the oil control disc.

9. The engine of claim 1, wherein the timing drive structure further comprises:

a tensioning plate located at least partially within the cylinder block, the tensioning plate located between the tensioner and the timing chain and connected to the timing chain.

10. The engine of claim 9, wherein the timing drive structure further comprises:

the guide plate is at least partially positioned in the cylinder body and connected with the cylinder body, and the guide plate is positioned on one side, away from the tensioning plate, of the timing chain and connected with the timing chain.

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