Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
  • F01L1/265—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder peculiar to machines or engines with three or more intake valves per cylinder
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
  • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
  • F01L13/0005—Deactivating valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
  • F01L2003/25—Valve configurations in relation to engine

Definitions

• the present invention provides a drive rocker arm, which is interlocked with and connected to an intake valve, between at least the intake valve and the camshaft, of the intake valve and the exhaust valve that are spring-biased in the valve closing direction.
• a free rocker arm that can be free with respect to the intake valve is interposed, and each rocker arm is provided with a connection switching mechanism that can switch between connection and disconnection thereof.
• the present invention relates to a valve gear for an internal combustion engine provided with a lost motion mechanism for urging the rocker arm toward the camshaft.
• valve train is known, for example, from Japanese Patent Application Laid-Open No. 63-57806.
• a lost motion mechanism is provided in the cylinder head in order to elastically urge the drive porter arm from below.
• the upper part of the cylinder head is provided with suction and exhaust ports, guide cylinders for guiding the intake and exhaust valves, and intake and exhaust valves in the valve closing direction.
• the shape of the port In order to secure a space for disposing the above-mentioned loss torsion mechanism, the shape of the port, the spring load of the valve spring (outer diameter of the valve spring), etc.
• the degree of freedom in the design of the cylinder is narrowed, and it is difficult to make the cylinder head compact.
• the present invention has been made in view of the above circumstances, and has a valve operating mechanism for an internal combustion engine that increases the degree of freedom in designing the upper part of a cylinder head and makes it possible to make the cylinder head compact.
• the purpose is to provide a device.
• the loss torsion machine is provided with a c-type structure which is disposed on the engine main body at a position above the driving force arm, so that the suction, Sufficient space for arranging exhaust ports, guide cylinders for guiding intake and exhaust valves, and valve springs for biasing intake and exhaust valves in the valve closing direction.
• a c-type structure which is disposed on the engine main body at a position above the driving force arm, so that the suction, Sufficient space for arranging exhaust ports, guide cylinders for guiding intake and exhaust valves, and valve springs for biasing intake and exhaust valves in the valve closing direction.
• One hundred and fifty-five screws can be secured under each of the rocking arms, increasing the degree of freedom in design and making the upper part of the engine more compact.
• FIG. 1 is a fragmentary plan view
• FIG. 2 pi-II line sectional view of FIG. 1
• FIG. 3 is a second view ⁇ - IE z . It is a line sectional view.
• the main part of the engine body E in the S ⁇ HC type multi-cylinder internal combustion engine has a cylinder head 1 and a cylinder head connected to the upper surface of the cylinder block 1. And a plurality of cylinders 3 provided in the cylinder block 1 at intervals in the axial direction of a crank shaft (not shown). 4 are slidably fitted to each other, and a combustion chamber 5 is formed between the upper surface of each of the screws 4 and the cylinder head 2.
• the cylinder head 2 corresponding to each cylinder 3 is provided with a pair of intake valve ports 6 and a pair of exhaust valve ports 7 that open on the ceiling surface of the combustion chamber 5.
• Port 6 is connected to a single intake port 8 opening on one side of cylinder head 2, and both exhaust valve ports 7 are connected to a single exhaust port opening on the other side of cylinder head 2.
• Go to 9 Both intake valve ports 6 individually openable pair of intake valves V,,, V I 2, respectively slidably fitted to the pair of guide tube 1 0 disposed Siri Ndae' de 2 Between the retainers 11, 11 fixed to the upper end of each intake valve V,,, V, 2 protruding from each guide cylinder 10, and the cylinder head 2.
• the camshaft 16 is provided on both sides of the cylinder head 2 and each cylinder 3 along the axis of the crankshaft. Holders 1 9, 1 9 respectively connected on head 2
• the cylinder 3 is rotatably supported while having a horizontal axis orthogonal to the axis of each cylinder 3.
• the cam shaft 16 includes a high-speed cam 21, a low-speed cam 22 adjacent to one side of the high-speed cam 21, and a high-speed cam 22 opposite to the low-speed cam 22.
• a raised portion 20 adjacent to 21 is integrally provided, and exhaust valve cams 23, 23 are provided on both sides of the low-speed force member 22 and the raised portion 20.
• the high-speed cam 21 has a shape for opening and closing the two intake valves V 1, V 2 in the high-speed operation range of the engine, and includes a base circle 21 a and a base circle 21 a. And a high-order portion 21b extending radially outward from the upper part.
• the low-speed cam 22 has a shape for opening and closing the intake valve V in the low-speed operation range of the engine.
• the low-speed cam 22 has a base circular portion 22 a and a radially outer portion of the cam shaft 16. The overhang to the base portion is smaller than the high portion 21b of the high-speed cam 21 and is narrower than the high portion 21b. Has 2b.
• the raised portion 20 basically has a circular outer surface centered on the axis of the camshaft 16 so that the intake valves V, z are substantially at rest in the low-speed operation range of the engine. Slightly protruding projections are provided at positions corresponding to the high-order portions 21b and 22b of the high-speed cam 21 and the low-speed cam 22. ing. In addition, the ridge in the direction along the line of the camshaft 16 The width of 20 is set relatively narrow. Et al is, exhaust valve cam 2 3, 2 3 has a shape for allowing opening and closing operation moving both exhaust valves V E 1, V E 2 regardless of the engine operating state.
• the one of the intake valves V interlocked first Mukurodoro Kkaamu 2 4 is connected, the other intake valve V I 2 interlocking second drive port Kkaamu 2 5, are connected, the intake valves VH, V IZ
• the free rocker arm 26 is disposed adjacent to the first and second drive rocker arms 24 and 25 while allowing the free rocker arm 26 to be free.
• the intermediate portion of each rocker arm 24, 25, 26 is located at a position above the camshaft 16 and the camshaft.
• the intermediate portion between the two exhaust-side port lock arms 29, 30 is swingably supported by the exhaust-side port arm arm shaft 28, which is fixedly supported by 15 das 19, 19, ....
• a port 31 for sliding contact with the low-speed cam 22 provided on the cam shaft 16 is pivotally supported.
• camshaft 16 is provided.
• the slits 32 that are in sliding contact with the raised ridges 20 are provided with a reduced width corresponding to the ridges 20, and the free rocker arms 26 are provided with a high speed provided on the camshafts 16.
• a cam spring 33 is provided in sliding contact with the cam 21.
• Rollers 34, which are in sliding contact with the exhaust valve cams 23, 23 provided on the 5- cam shaft 16, are supported at one end of both exhaust side rocker arms 29> 30 respectively. .
• the first and second drive port Kkaamu 2 4, 2 5 of the other end, the intake valves VH, are those Sessurutape' and the screw 35 to the upper end of the V 12 are engaged freely screw respectively proceeds withdrawal , the intake valves V ⁇ according to the swinging 10 operating motion of the intake-side ⁇ Kkaamu 2 4, 2 5, V IZ is the child opened and closed.
• a tap screw 36 abutting on the upper end of each of the exhaust valves V E 1 and V EZ is screwed so as to be able to advance and retreat, respectively.
• side b Kkaamu 2 9, 3 0 of the rocking operation movement in accordance with the exhaust valves V EI, it becomes a child 'V E2 are opened and closed.
• a support plate 37 is fixed to the support plate 37, and a lost motion is provided on the support plate 37 to urge the free rocker arm 26 from above toward the high-speed cam 21.
• a mechanism 38 is provided.
• the Z 0 loss motion mechanism 38 is a bottomed circle fitted to the support plate 37.
• a cylindrical guide member 39 and a contact portion 40 a that is slidably fitted to the guide member 39 and is in contact with the free mouth hook arm 26 at the end on the free mouth hook arm 26 side.
• the piston 40 is formed in a tapered shape
• the horn 41 is detachably fixed to the inner surface near the opening end of the guide member 39 so as to engage with the piston 40
• the first and second springs 42, 43 interposed between the piston 40 and the guide member 39 to resiliently bias the ton 40 in the direction of contact with the free mouth arm 26. Is provided.
• the support plate 37 is provided with a bottomed cylindrical portion 37a which is opened downward at a position corresponding to each free rocker arm 26, and the guide member 39 has an open end. It is fitted into the bottomed cylindrical portion 37a while being in the lower position.
• a spring chamber 44 is defined between the piston 40 and the guide member 39, and a spring constant is set between the retainer 45 and the piston 40 housed in the spring chamber 44.
• a relatively small first spring 42 is contracted, and a second spring 43 having a relatively large spring constant is contracted between the retainer 45 and the closed end of the guide member 39.
• a small-diameter hole 40b with a bottom is formed coaxially on the inner surface of the closed end of the piston 40, and a first spring 42 having a relatively small spring constant is accommodated in the small-diameter hole 40b. This prevents the first spring 42 from falling down. Also, the abutment portion 40 a of the piston 40 has a sliding action of the piston 40. In order to prevent the inside of the spring chamber 44 from being heated or depressurized at the time, an air vent hole 46 communicating the spring chamber 44 with the outside is formed in a cross shape that opens on the outer surface of the contact part 40a. Drilled.
• an oil groove 47 extending parallel to the camshaft 16 is provided on the support plate 37 adjacent to the base end of the bottomed cylindrical portion 37a.
• An oil passage 48 for guiding the oil flowing through the oil groove 47 into the spring chamber 44 is provided at the base end of the guide member 39 and the guide member 39.
• the first drive rocker arm 24, the second drive rocker arm 25, and the free opening force arm 26 are provided with a connection switching mechanism 50 capable of switching between connection and disconnection.
• the connection switching mechanism 50 includes a connection piston 51 capable of connecting the first drive rocker arm 24 and the free rocker arm 26, a free rock arm 26 and a second control rocker arm.
• the first bottomed guide hole 55 that is released is drilled in parallel with the intake side inlet arm arm shaft 27, and the connecting screw 51 can slide in this first guide hole 55.
• a hydraulic chamber 56 is defined between one end of the connection screw 51 and the closed end of the first guide hole 55.
• the first drive rocker arm 24 is provided with a communication passage 57 communicating with the hydraulic chamber 56, and a hydraulic supply passage 58 connected to a hydraulic supply source (not shown) is provided in the intake rocker arm shaft 27.
• the hydraulic supply path 58 is always in communication with the communication path 5, that is, the hydraulic chamber 56, regardless of the swinging state of the drive port arm 24.
• the free rocker arm 26 has a guide hole 59 corresponding to the first guide hole 55, and is formed in parallel between the intake-side inlet locker arm 27 and both side surfaces.
• a connecting pin 52 one end of which is in contact with the other end of the connecting screw 51, is slidably fitted into the guide hole 59.
• the second drive rocker arm 25 has a bottomed second guide hole 60 corresponding to the guide hole 59, which is open to the free rocker arm 26 side to open the suction side port.
• a bottomed cylindrical regulating member 53 which is bored in parallel with 27 and abuts the other end of the connecting pin 52, is slidably fitted in the second guide hole 60. This regulating member 53 is arranged with its opening zo end facing the closed end side of the second guide hole 60.
• a flange 53 a protruding radially outward at the opening end is in sliding contact with the inner surface of the second guide hole 60.
• the return spring 54 is contracted between the closed end of the second guide hole 60 and the closed end of the restricting member 53, and the connection that abuts on each other by the spring force of the return spring 54.
• the screws 51 and the connection bins 52 and the regulating members 53 are urged toward the hydraulic chamber 56.
• a communication hole 61 for air and oil drainage is formed at the closed end of the second guide hole 60.
• an ignition plug 64 is provided at the center of the ceiling surface of the combustion chamber 5, and a plug pipe 65 for inserting the ignition plug 64 is provided in a series. It is located on the second head.
• the pair of exhaust valve side porter arms 29, 30 are provided on both sides of the first drive rocker arm 24, the free rocker arm 26, and the second drive rocker arm 25, which are arranged adjacent to each other.
• the camshaft 16 is disposed so as to be in sliding contact with the cams 23 and 23 for the exhaust valve. As a result, it is possible to secure a relatively large space between the exhaust side opening arms 29, 30 and the exhaust valves V E , V EZ have a relatively wide space between them. It can be arranged.
• the plug pipe 65 is disposed on the cylinder head 2 so as to be located between the two exhaust valves V ⁇ V ⁇ z and between the two exhaust valve side inlet arms 29, 30.
• connection screw 51 and the connection bin 52 When the engine is running at low speed, the hydraulic pressure in the hydraulic chamber 56 in the connection switching mechanism 50 is released, and the contact surface between the connection screw 51 and the connection bin 52 is set to the first position by the spring force of the return spring 54. It is located at a position corresponding to the movable rocker arm 24 and the free rocker arm 26, and the contact surfaces of the connecting pin 52 and the regulating member 53 are formed by the free rocker arm 26 and the second drive rocker arm. It is in the position corresponding to between 25. Therefore,. Each rocker arm 24, 25, 26 can be displaced relative to each other.
• exhaust valve V E ! , VE 2 is the timing and shape according to the shape of the exhaust valve cams 23, 23.
• the first drive port arm 24 which is operating in the low-speed range where the friction loss of the valve system accounts for a large proportion of the friction loss of the entire engine, is reduced by the low-speed Because of the sliding contact with 2 2, reduction of the valve train friction loss in the low-speed range, that is, reduction of the friction loss of the entire engine
• each mouth arm 2 4 ⁇ 26 are connected.
• both rocker arm and the second drive rocker arm have the largest rocking amount of the free rocker arm 26 sliding on the high-speed power supply 21.
• 24 and 25 swing together with the free-opening arm 26 and both intake valves V,, and V IZ are opened and closed with the timing and lift amount according to the shape of the high-speed power unit 21.
• both exhaust-side outlet locks 29 and 30 are provided with timing and lift according to the shape of the exhaust valve cams 23 and 23 as in low-speed operation. Open and close V E V EZ .
• a lost motion mechanism 38 that urges the free rocker arm 26 toward the camshaft 16 is a support plate that connects the upper ends of the holders 19, 19,.
• the free mouth arm 26 is elastically urged from above to the cam shaft 16 side. Therefore intake boat 8, the exhaust port 9, the intake valves V, V 12 15 and the exhaust valve V E V E2 Guide tube 1 0 for guiding the, 1 3, and the intake valves V, ,, V 12 and exhaust Siri sufficient scan pace to dispose the valve V E 1, the valve spring 1 2 for biasing the V E2 in the valve closing direction, 1 5, etc. below the respective Lock Kaamu 2 4-2 6
• the shape of each of the boats 8 and 9 and the valve spring 1 z can be secured on the head 2. Increase the degree of freedom in design such as the spring load (valve spring outer diameter) of 2, 15 Can also be used for cylinder head 2

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve Device For Special Equipments (AREA)
• Valve-Gear Or Valve Arrangements (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=12569394

Family Applications (1)

Country Status (6)

Families Citing this family (11)

Citations (2)

Family Cites Families (14)

• 1990
  • 1990-04-13 JP JP1990040026U patent/JP2517078Y2/ja not_active Expired - Lifetime
• 1991
  • 1991-04-12 EP EP91907510A patent/EP0524314B1/en not_active Expired - Lifetime
  • 1991-04-12 DE DE69116353T patent/DE69116353T2/de not_active Expired - Fee Related
  • 1991-04-12 WO PCT/JP1991/000484 patent/WO1991016527A1/ja active IP Right Grant
  • 1991-04-12 CA CA002080350A patent/CA2080350C/en not_active Expired - Fee Related
  • 1991-04-12 US US07/960,001 patent/US5363818A/en not_active Expired - Lifetime

Patent Citations (2)

Non-Patent Citations (1)

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