JP2010229880A - Internal combustion engine including rotation sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components, miniaturize a rotation transmission mechanism around a cam shaft, and miniaturize an engine body and a cover member covering the rotation transmission mechanism in an internal combustion engine including a rotation sensor for detecting a rotation state of a camshaft. <P>SOLUTION: The internal combustion engine E includes the rotation sensor 80 detecting the rotation position of a detected part 71 provided on a driven rotation member driven and rotated by the rotation transmission mechanism T transmitting rotation of the crankshaft 5 to the camshafts 31, 32. The rotation transmission mechanism T includes an intermediate rotation member 50 rotating at same speed as the camshafts 31, 32 and having a rotation center line L1 closer to a crankshaft 5 than cam center lines Li, Le of the camshafts 31, 32, a primary rotation transmission mechanism 40 transmitting rotation of the crankshaft 5 to the intermediate rotation member 50, and a secondary rotation transmission mechanism 60 transmitting rotation of the intermediate rotation member 50 to each camshaft 31, 32. The detected part 71 is disposed on the intermediate rotation member 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an internal combustion engine provided with a rotation sensor for detecting a rotation state of a camshaft that is driven to rotate by a crankshaft through a rotation transmission mechanism, and more specifically, a target whose rotation position is detected by the rotation sensor. The present invention relates to the structure of a rotating member provided with a detection unit.

  An internal combustion engine includes a rotation transmission mechanism that transmits rotation of a crankshaft to a camshaft, and a rotation sensor that detects a rotation position of a detected portion provided on a driven rotation member that is driven to rotate by the rotation transmission mechanism. A device that detects the rotational state of the camshaft based on the rotational position of the detected portion detected by the sensor is known. (For example, see Patent Document 1)

Japanese Patent No. 2914523

In order to detect the rotation state of the camshaft included in the internal combustion engine, a driven rotation member provided with a detected portion whose rotation position is detected by a rotation sensor is transmitted by a rotation transmission mechanism that transmits the rotation of the crankshaft to the camshaft. Although it is rotationally driven, it itself does not form a rotation transmission path from the crankshaft to the camshaft, and is a dedicated member for providing a detected portion (hereinafter referred to as “detected rotating member”). For example, in the case of the idle pulley disclosed in Patent Document 1), in addition to the members constituting the rotation transmission mechanism, the rotation member for detection is required, so the number of parts is increased and the cost is reduced. Invite an increase.
Further, when the rotation member for detection is coaxial with the cam shaft and the rotation member for detection rotates at the same speed as the cam shaft, the outer diameter of the rotation member for detection is provided on the cam shaft. Since the outer diameter of the cam side rotating body (for example, cam pulley) constituting the rotation transmitting mechanism is the same as that of the cam side rotating body, there is a cover member that covers the engine body and the rotation transmitting mechanism in the radial direction of the cam shaft around the cam side rotating body. Increase in size.
Further, in the internal combustion engine in which each of the plurality of camshafts is provided with a phase control mechanism capable of changing the phase of each camshaft with respect to the crankshaft, the rotation member for detection is provided coaxially with the camshaft so that the cam The engine body and the cover member are enlarged not only in the radial direction of the cam shaft but also in the axial direction of the cam shaft in the vicinity of the side rotating body.

  The present invention has been made in view of such circumstances, and the invention according to claims 1 to 6 is provided in a driven rotating member that is rotationally driven by a rotation transmission mechanism that transmits rotation of a crankshaft to a camshaft. In the internal combustion engine having a rotation sensor for detecting the rotation position of the detected portion to detect the rotation state of the cam shaft, the number of parts is reduced and the rotation transmission mechanism around the cam shaft is downsized. Therefore, it is an object to reduce the size of the cover member that covers the engine main body and the rotation transmission mechanism. According to a second aspect of the present invention, there is a further object of accurately detecting the rotation state of the first and second camshafts by the structure of the second rotation transmission mechanism. For the purpose of accurately detecting the rotation states of the first and second camshafts provided with the first and second phase control mechanisms, respectively, and reducing the size of the first and second phase variable devices. The inventions described in Items 4 and 5 further improve the detection accuracy of the rotation sensor by the structure of the intermediate rotation member provided with the detected portion, and the invention described in Item 6 further includes rotation. It is an object to facilitate the setting of the position of the sensor and the detected portion and increase the accuracy.

The invention according to claim 1 transmits the rotation of the crankshaft (5) to the camshaft (C) and the engine body (Ea) that rotatably supports the crankshaft (5) and the camshaft (C). A rotation transmission mechanism (T), a cover member (20) attached to the engine body (Ea) and covering the rotation transmission mechanism (T), and a driven rotation member that is rotationally driven by the rotation transmission mechanism (T). In the internal combustion engine comprising a rotation sensor (80) for detecting a rotation position of the detected portion (71) provided and a holding member for holding the rotation sensor (80), the rotation transmission mechanism (T) An intermediate rotating member (50) that rotates at a constant speed with the cam shaft (C) and has a rotation center line (L1) closer to the crank shaft (5) than the cam center lines (Li, Le) of the cam shaft (C). ) And rotation of the crankshaft (5) A primary rotation transmission mechanism (40) for transmitting to the material (50), and a secondary rotation transmission mechanism (60) for transmitting the rotation of the intermediate rotation member (50) to the camshaft (C). The rotating member is an internal combustion engine that is the intermediate rotating member (50).
According to a second aspect of the present invention, in the internal combustion engine according to the first aspect, the cam shaft (C) is a first cam shaft (31) and a second cam shaft (32), and the secondary rotation transmission mechanism ( 60) includes a first cam side rotating body (61i) that can rotate integrally with the first cam shaft (31), and a second cam side rotating body (61e) that can rotate integrally with the second cam shaft (32). And a common secondary intermediate transmission member (62) for transmitting the rotation of the intermediate rotation member (50) to the first cam side rotation body (61i) and the second cam side rotation body (61e). is there.
According to a third aspect of the present invention, in the internal combustion engine according to the second aspect, the first camshaft (31) includes a first cam that controls a phase of the first camshaft (31) with respect to the crankshaft (5). A phase control mechanism (33) is provided, and the second cam shaft (32) has a second phase control mechanism (34) for controlling the phase of the crank shaft (5) with respect to the second cam shaft (32). The first cam side rotating body (61i) transmits rotation to the first cam shaft (31) via the first phase control mechanism (33), and the second cam side rotating body ( 61e) transmits rotation to the second camshaft (32) via the second phase control mechanism (34).
According to a fourth aspect of the present invention, in the internal combustion engine according to any one of the first to third aspects, the holding member holds the rotation sensor (80) and can rotate the intermediate rotation member (50). It has an integrally molded holding body (23) that supports it.
According to a fifth aspect of the present invention, in the internal combustion engine according to any one of the first to fourth aspects, the intermediate rotating member (50) is driven to rotate by the primary rotation transmission mechanism (40). A rotating body (51B) and an intermediate driving gear (52) that rotates integrally with the intermediate driven rotating body (51B) and transmits the rotation of the intermediate driven rotating body (51B) to the secondary rotation transmission mechanism (60). The driven rotating member is the intermediate driven rotating body (51B), and the holding member (23) regulates the axial movement of the intermediate drive gear (52).
According to a sixth aspect of the present invention, in the internal combustion engine according to the fifth aspect, the holding member is the cover member (20), and the cover member (20) moves the intermediate drive gear (52) to the engine body. An inner cover (23) covering from the axial direction to (Ea), and an outer cover (21) covering the intermediate driven rotating body (51B) and the inner cover (23) from the outer side in the axial direction, The rotation sensor (80) has a detection part (80a) that can face the detected part (71) across a gap (G), and the inner cover (23) An opening (23o) through which the detected part (71), the gap (G) and the detection part (80a) are exposed is formed, and the outer cover (21) covers the opening (23o). .

According to the first aspect of the present invention, the primary rotation transmission mechanism, the intermediate rotation member, and the secondary rotation transmission mechanism constituting the rotation transmission mechanism form a rotation transmission path that transmits the rotation of the crankshaft to the camshaft. Since the detected portion detected by the rotation sensor forms a rotation transmission path and is provided on the intermediate rotation member before reaching the camshaft, the detected portion detected by the rotation sensor is provided while the rotation transmission path is formed. Since the rotation member for detection which is a driven rotation member which is not required is not necessary, the number of parts is reduced, and the cost can be reduced.
In addition, since the intermediate rotation member rotates at the same speed as the cam shaft, the secondary rotation transmission mechanism does not need to be a speed reduction mechanism. Therefore, the outer diameter of the cam side rotating body of the secondary rotation transmission mechanism provided on the cam shaft The rotation center line of the intermediate rotation member is positioned closer to the crankshaft than the cam center line of the camshaft. As a result, the rotation transmission mechanism can be reduced in the radial direction around the cam shaft, and the engine body and the cover member can be reduced in the radial direction, and the intermediate rotation member and the cam shaft can be axially aligned in the axial direction. The engine body and the cover member in an integrated state can be reduced in size in the axial direction as compared with the case where they are arranged side by side.
According to a second aspect of the present invention, the secondary rotation transmission mechanism is configured to rotate the intermediate rotation member at a constant speed through the secondary intermediate transmission member common to the first and second camshafts. , The rotation state of the first and second camshafts can be accurately detected by the rotation sensor.
According to a third aspect of the present invention, the first and second phase control mechanisms indicate the rotational states of the first and second camshafts whose phases with respect to the crankshaft are independently changed by the first and second phase control mechanisms. Regardless of the operating state, it can be accurately detected by the rotation sensor.
In addition, the first and second phase control mechanisms can be downsized in the radial direction of each cam shaft, including the case where the first and second cam side rotating bodies are provided in the first and second phase control mechanisms. The main body and the cover member can be downsized in the radial direction.
According to the fourth aspect of the present invention, since the intermediate rotation member provided with the rotation sensor and the detected portion is held by the integrally formed holding body, compared with the case where both are held by separate members. Since the mutual arrangement accuracy of the rotation sensor and the detected part is increased, the detection accuracy of the rotation sensor can be increased.
According to the fifth aspect of the present invention, the detected portion is an intermediate rotating member having an intermediate driven rotating body and an intermediate driving gear, and since the detected portion is provided on the intermediate driven rotating body, the intermediate driving gear is reduced in size. As a result, the secondary rotation transmission mechanism can be reduced in size.
Further, since the axial movement of the intermediate driven rotating body is restricted using the intermediate drive gear whose axial movement is restricted by the holding member, the holding member restricts the axial movement of the intermediate driven rotating body. Therefore, the positional deviation between the detected portion and the rotation sensor in the axial direction is suppressed, and the detection accuracy of the rotation sensor can be improved.
According to the sixth aspect of the present invention, since the detected portion, the gap, and the detecting portion are exposed in the opening when viewed from the axial direction by removing the outer cover, detection of the detected portion and the rotation sensor Setting of the position with the part becomes easy, and the position setting can be performed with high accuracy.

It is a figure of the principal part centering on a rotation transmission mechanism when the internal combustion engine to which the present invention is applied is viewed from one axial direction. It is the II-II sectional view taken on the line of FIG. FIG. 2 is a view of a main part near an intermediate driven pulley of the rotation transmission mechanism when a primary cover that covers a part of the rotation transmission mechanism is removed in the internal combustion engine of FIG. 1.

Embodiments of the present invention will be described below with reference to FIGS.
Referring to FIG. 1, an internal combustion engine E to which the present invention is applied is a V-type internal combustion engine as a multi-cylinder internal combustion engine mounted on a vehicle.
The internal combustion engine E includes an engine body Ea including a pair of banks B1 and B2, a cover member 20 that is attached to the engine body Ea and covers a rotation transmission mechanism T described later, and is rotatably supported by the engine body Ea. A crankshaft 5.
In FIG. 1, the cover member 20 is indicated by a two-dot chain line. For the engine main body Ea indicated by the one-dot chain line, the edge of the engine main body Ea that overlaps with the edge of the cover member 20 when viewed in the axial direction is illustrated. For the sake of convenience, the cover member 20 is shown larger than the edge.

  In the specification and claims, the axial direction is assumed to be a direction parallel to a crank center line that is a rotation center line of the crankshaft. Further, in the embodiment, when the crank center line Lo is included in the horizontal plane in the vertical direction, in the V-type engine or the horizontally opposed engine, the cylinder axis Lc of the cylinders 1a of both banks B1 and B2 when viewed from the axial direction. Is the direction in which the bisector of the angle formed extends, and in the example shown, it coincides with the vertical direction, and in a single cylinder or in-line multi-cylinder engine, the direction is parallel to the cylinder axis Lc of the cylinder 1a. And

The engine body Ea is arranged so as to constitute a pair of cylinder portions 2a and 2b and has a cylinder block 1 having a plurality of cylinders 1a integrally formed by integral molding. 2 A pair of cylinder heads 3 coupled to the upper ends of the cylinder portions 2a and 2b, a pair of head covers 4 respectively coupled to the upper ends of the pair of cylinder heads 3, and a lower end of the cylinder block 1 An oil pan (not shown) to be coupled.
The lower part 1c of the cylinder block 1 and the oil pan constitute a crankcase forming a crank chamber in which a crankshaft 5 as an output shaft of the internal combustion engine E is disposed. The crankcase has a crank center line Lo. The shaft 5 is rotatably supported via the main bearing.

Each cylinder part 2a, 2b is comprised from 1 or several cylinder 1a. In this embodiment, both cylinder parts 2a and 2b each have three cylinders 1a as a plurality which are the same number. The bank B1 is composed of the cylinder part 2a, the cylinder head 3 and the head cover 4, and the bank B2 is composed of the cylinder part 2b, the cylinder head 3 and the head cover 4.
Further, in a state in which the internal combustion engine E is mounted on the vehicle, the crank center line Lo is parallel to the longitudinal direction of the vehicle, and in the pair of banks B1 and B2 forming a V shape when viewed from the axial direction, Bank B1 is the left bank and second bank B2 is the right bank.

In each of the banks B1 and B2, a piston 6 that is fitted to each cylinder 1a so as to be able to reciprocate is provided, and a combustion chamber 7 formed by the cylinder 1a, the cylinder head 3, and the piston 6 is provided for each cylinder 1a. The cylinder head 3 includes an intake port 8 that guides intake air flowing through the intake device to the combustion chamber 7, an exhaust port 9 that guides the combustion gas from the combustion chamber 7 to the exhaust device as exhaust gas, an intake port 8 and exhaust gas. An intake valve 10 and an exhaust valve 11 serving as engine valves for opening and closing the ports 9 are provided for each cylinder 1a.
The piston 6 is driven by the pressure of the combustion gas generated by the combustion of the mixture of intake air and fuel in the combustion chamber 7 to reciprocate, and rotationally drives the crankshaft 5 via the connecting rod 12.

Referring also to FIG. 2, the engine main body Ea can be attached to and detached from an end Ea1 on one side A1 in the axial direction (in this embodiment, forward) by bolts 13 and 15 as a number of coupling tools. The cover member 20 to be attached to the primary cover 21 is coupled to the end 1e by a bolt 13 at a joint 21b disposed along the edge that is joined to the end 1e of the cylinder block 1 in a sealed state. Further, in the joint portions 23b and 24b arranged along the edge portions joined in a sealed state to the respective end portions 3e and 4e of the cylinder head 3 and the head cover 4, they are detachably coupled to the respective end portions 3e and 4e by bolts 13. The secondary cover 22 is formed.
Therefore, the end Ea1 of the engine body Ea is composed of the end 1e of the cylinder block 1, the end 3e of the cylinder head 3, and the end 4e of the head cover 4 in one direction A1.

The secondary cover 22 includes a first cover 23 coupled across the end 1e and the end 3e, and an opposing edge coupled to the end 4e of the head cover 4 and joined to the first cover 23 in a sealed state. It is comprised from the 2nd cover 24 couple | bonded by the volt | bolt 14 between the coupling | bond parts 23c and 24c (refer also FIG. 3). Each of the primary cover 21, the first cover 23, and the second cover 24 is a single member formed by integral molding.
As another example, the second cover 24 may be integrally formed with the head cover 4 as a part of the head cover 4, and as another example, the first and second covers 23 and 24 are integrally formed. May be formed.
The primary cover 21 is disposed on the one-way A1 side with respect to the first cover 23 as an inner cover disposed on the one-way A1 side in the axial direction with respect to the end portion 3e of the cylinder head 3, and The outer cover covers a part of the cover 23 from one direction A1, and is coupled to the end 3e together with the first cover 23 by a bolt 15 at the coupling portion 21c.

  The internal combustion engine E is provided in each bank B 1, B 2, and a pair of valve gears 30 including cam shafts C that open and close the intake valves 10 and the exhaust valves 11, and the camshaft C is rotationally driven by the crankshaft 5. A rotation transmission mechanism T for transmitting the rotation of the crankshaft 5 rotating in the rotation direction R to the camshaft C, and a single rotation sensor 80 for detecting the rotation state of the camshaft C such as the rotational speed of the camshaft C; One or more, here four, cam rotation sensors 81 for detecting the rotational position of the camshaft C are provided.

Each valve gear 30 is disposed in a cam chamber S1 formed by the cylinder head 3, the head cover 4, and the secondary cover 22. Each valve gear 30 includes an intake cam shaft 31 as a first cam shaft for driving an intake valve 10 as a first engine valve and an exhaust cam as a second cam shaft for driving an exhaust valve 11 as a second engine valve. A cam follower such as a rocker arm that is driven by a camshaft C composed of a shaft 32 and a valve operating cam (not shown) provided on each of the camshafts 31 and 32 to open and close the intake valve 10 and the exhaust valve 11 respectively. (Not shown), and the opening and closing timings of the intake valve 10 and the exhaust valve 11 are controlled by controlling the phases of the cam shafts 31 and 32 with respect to the crankshaft 5 provided on the intake cam shaft 31 and the exhaust cam shaft 32, respectively. An intake phase control mechanism 33 as a first phase control mechanism to be controlled and an exhaust phase control mechanism 34 as a second phase control mechanism are provided. The intake phase control mechanism 33 is provided at the shaft end portion of the intake cam shaft 31, and the exhaust phase control mechanism 34 is provided at the shaft end portion of the exhaust cam shaft 32.
In each bank B1, B2, each cam shaft 31, 32 and each phase control mechanism 33, 34 are arranged in a cam chamber S1 as a first storage chamber.

  The camshafts 31 and 32 that are driven by the power of the crankshaft 5 transmitted through the rotation transmission mechanism T and rotate at a rotational speed ½ of the rotational speed of the crankshaft 5 are coupled to the cylinder head 3 by bolts. The cam head 18 is rotatably supported by a cam holder 18 provided integrally with the cylinder head 3 and has cam center lines Li and Le which are rotation center lines parallel to the crank center line Lo. Therefore, each cylinder head 3 rotatably supports the cam shafts 31 and 32 via the cam holder 18.

  Each of the phase control mechanisms 33 and 34 is a known device that causes relative rotation between the rotation transmission mechanism T and the intake cam shaft 31 and the exhaust cam shaft 32. For example, each phase control mechanism 33; 34 as a hydraulic device includes an outer rotating body 33a; 34a and an inner rotating body 33b; 34b that can rotate relative to each other, and is formed by both rotating bodies 33a, 33b; 34a, 34b. The supply and discharge of hydraulic oil to and from the hydraulic chambers 33c; 34c are controlled by hydraulic control valves that are controlled according to the engine operating state by a control device provided in the internal combustion engine E, so that both rotating bodies 33a, 33b; 34a, 34b The phase can be changed by the relative rotation of the rotating bodies 33 and the rotating bodies 33a, 33b; 34a, 34b do not rotate relative to each other in a state where the hydraulic oil is not supplied to or discharged from the hydraulic chambers 33c; 34c. Rotates together.

The rotation transmission mechanism T, which is disposed between the end portions 1e, 3e, 4e and the cover member 20 in the axial direction and is covered by the cover member 20 from one direction A1, is the end portion of the cylinder head 3 in each bank B1, B2. 3e and a pair of intermediate rotating members 50 that rotate at a predetermined rotational speed that is shifted with respect to the rotational speed of the crankshaft 5 and a rotation of the crankshaft 5 is transmitted to the intermediate rotating member 50. A primary rotation transmission mechanism 40 and a pair of secondary rotation transmission mechanisms 60 for transmitting the rotations of both intermediate rotation members 50 to the cam shafts 31 and 32 in the banks B1 and B2, respectively.
In this embodiment, the speed ratio is 1/2, and the predetermined rotational speed is equal to the rotational speed of the cam shafts 31 and 32. Therefore, the intermediate rotating members 50 rotate at the same speed as the cam shafts 31 and 32. To do.

Both intermediate rotating members 50 as driven rotating members that are rotationally driven by one primary rotation transmitting mechanism 40 common to both the secondary rotation transmitting mechanisms 60 have basically the same structure.
The intermediate rotating member 50 rotates integrally with the intermediate driven pulley 51 as an intermediate driven rotating body that is rotationally driven by the primary rotation transmitting mechanism 40, and transmits the rotation of the intermediate driven pulley 51 to the secondary rotation. It has an intermediate drive gear 52 as an intermediate drive rotary member that transmits to the mechanism 60, and an intermediate rotary shaft 53 as a connecting portion that connects the intermediate driven pulley 51 and the intermediate drive gear 52 so as to rotate together. Therefore, each intermediate rotation member 50 is a member in which the intermediate driven pulley 51, the intermediate drive gear 52, and the intermediate rotation shaft 53 are integrated.

Each intermediate driven pulley 51 has a disc-shaped main body 51a having a rim portion 51b that is an outer peripheral portion around which the belt 42 is wound.
The intermediate drive gear 52 and the intermediate rotation shaft 53 are formed by a single member that is integrally formed. The intermediate driven pulley 51 is fixed by fixing means such as press-fitting and bolts, here the bolts 16, while being fitted to the intermediate rotating shaft 53. The intermediate driven pulley 51 and the intermediate driving gear 52 are arranged in the intermediate rotating member 50 so as to be separated from each other in the axial direction with the first cover 23 interposed therebetween, and in the axial direction, the intermediate driven pulley 51 is closer to the primary cover 21 or The intermediate drive gear 52 is disposed near the end 3e or in the axial direction and on the other direction A2 side opposite to the one direction A1.

The primary rotation transmission mechanism 40 covered by the primary cover 21 from the one-way A1 includes a drive pulley 41, a tensioner 43, an idler 44, and a drive rotating body provided to rotate integrally with the crankshaft 5. A winding-type rotation transmission mechanism including a driving pulley 41, a tensioner 43, an idler 44, and a belt 42 as an endless transmission belt that is stretched over both intermediate driven pulleys 51.
The primary rotation transmission mechanism 40 and the intermediate driven pulley 51 are arranged in a belt chamber S2 as a second storage chamber formed by the primary cover 21 and the first cover 23. The cam chamber S1 in which each secondary rotation transmission mechanism 60 is accommodated is an oil atmosphere space, whereas the belt chamber S2 in which the belt 42 is accommodated is a non-oil space substantially free of oil.
Therefore, each intermediate rotation member 50 is disposed in the accommodating chamber S composed of the cam chamber S1 and the belt chamber S2, and is disposed across the cam chamber S1 and the belt chamber S2. The first cover 23 is a partition that separates the oil atmosphere space that is the cam chamber S1 from the non-oil space that is the belt chamber S2.

  Each of the secondary rotation transmission mechanisms 60 having the same basic structure is covered by the secondary cover 22 from one direction A1. Each rotation transmission mechanism 60 includes a cam side gear 61 as a cam side rotating body provided to rotate integrally with the outer side rotating bodies 33a and 34a of the phase control mechanisms 33 and 34, an intermediate drive gear 52, and a cam side gear. And a gear mechanism including an intermediate gear 62 that is a secondary intermediate rotating member serving as a secondary intermediate transmission member that meshes with 61 and transmits the rotation of the intermediate drive gear 52 to the cam side gear 61. The intermediate gear 62 is rotatably supported by the end 3e and the first cover 23 via a support shaft 63 fixed to the end 3e and the first cover 23.

The cam side gear 61 is a first cam side gear as a first cam side rotating body that can rotate integrally with the intake cam shaft 31, and a second cam side rotating body that can rotate integrally with the exhaust cam shaft 32. And an exhaust gear 61e which is a second cam side gear. The intake gear 61i and the exhaust gear 61e always rotate integrally with the outer rotators 33a and 34a of the phase control mechanisms 33 and 34, while the outer rotators 33a and 34a and the inner rotators rotate during phase control by the phase control mechanisms 33 and 34. When the bodies 33b and 34b rotate relative to each other, they rotate relative to the intake camshaft 31 and the exhaust camshaft 32, respectively. When the outer rotating bodies 33a and 34a and the inner rotating bodies 33b and 34b rotate integrally, The intake camshaft 31 and the exhaust camshaft 32 rotate together.
The intermediate gear 62 is a common member that transmits the rotation of the intermediate rotation member 50 to the intake gear 61i and the exhaust gear 61e. The intake gear 61i transmits the rotation of the intermediate rotation member 50 to the intake camshaft 31 via the intake phase control mechanism 33, and the exhaust gear 61e is transferred to the exhaust camshaft 32 via the exhaust phase control mechanism 34. Transmit the rotation of

  Each intermediate rotation member 50 and each intermediate gear 62 have rotation center lines L1 and L2 parallel to the cam center lines Li and Le, respectively. A rotation center line L1, which is a rotation center line of the intermediate driven pulley 51, the intermediate drive gear 52, and the intermediate rotation shaft 53, is positioned closer to the crankshaft 5 or the crank center line Lo than the cam center lines Li and Le in the cylinder axis direction. The distance between the crank center line Lo and the rotation center line L1 is smaller than the distance between the crank center line Lo and the cam center lines Li and Le.

The intermediate drive gear 52, the intermediate gear 62, the intake gear 61i, and the exhaust gear 61e are disposed in the cam chamber S1. Further, the outer diameters of the intermediate drive gear 52, the intermediate gear 62, the intake gear 61i, and the exhaust gear 61e are smaller than the outer diameter of the intermediate driven pulley 51. The intermediate drive gear 52, the intermediate gear 62, the intake gear 61i, and the exhaust gear 61e rotate at a constant speed and rotate at a rotation speed equal to the rotation speed of the cam shafts 31 and 32. When viewed from the axial direction, the intermediate driven pulley 51 and the intake cam / exhaust gear 61e are in positions that do not overlap.
The intermediate drive gear 52, the intake gear 61i and the exhaust gear 61e are provided with auxiliary gears 54 and 64 biased by a spring (not shown) for eliminating backlash.

Referring to FIG. 2, the intermediate rotation shaft 53 of each intermediate rotation member 50 is a position where the intermediate drive gear 52 is sandwiched in the axial direction by the bearing portion 3 n of the end 3 e of the cylinder head 3 and the bearing portion 23 n of the first cover 23. Both journal portions 53a and 53b provided in the shaft are rotatably supported without a bearing or via a bearing 55.
The intermediate rotating member 50 is in contact with the first cover 23, and the first and second axial contact portions as the restricted portions that restrict the movement of the intermediate rotating member 50 in the axial direction by the first cover 23. 56, 57. The contact portion 56 provided on the rim portion, which is the outer peripheral portion of the intermediate drive gear 52, contacts the first cover 23 in the axial direction, so that the movement of the intermediate rotation member 50 in one direction A1 is restricted, and the intermediate drive When the contact portion 57 provided on the hub portion, which is the inner peripheral portion of the gear 52, contacts the end portion 3e in the other direction A2, the movement of the intermediate rotation member 50 in the other direction A2 is restricted. Therefore, the first cover 23 restricts the axial movement of the intermediate drive gear 52 in the one direction A1, which is the direction toward the intermediate driven pulley 51 in the axial direction, and consequently the shaft of the intermediate driven pulley 51 and the intermediate rotating member 50. Regulate direction movement.

  Referring to FIG. 1, during operation of the internal combustion engine E, the rotation of the crankshaft 5 is caused by the driving pulley 41 and the belt 42 of the primary rotation transmission mechanism 40 and the intermediate driven pulley 51 of the intermediate rotating member 50 in each bank B1 and B2. The intermediate rotation shaft 53 and the intermediate drive gear 52 are transmitted to the intake cam shaft 31 and the exhaust cam shaft 32 through a rotation transmission path formed by the intermediate gear 62 of the secondary rotation transmission mechanism 60, the intake gear 61i, and the exhaust gear 61e. The camshafts 31 and 32 are rotationally driven by the rotation (or power) of the crankshaft 5 transmitted through the rotation transmission mechanism T.

1 to 3, in a pair of intermediate driven pulleys 51, a first intermediate driven pulley 51 </ b> A (see FIG. 3) around which a slack side portion of the belt 42 is wound, and a tension side portion of the belt 42 are wound around. The intermediate driven pulley 51B (see FIG. 3), which is one of the second intermediate driven pulleys 51B, is coupled to a rim portion 51b around which the belt 42 is wound by fixing means such as press fitting or caulking. And a to-be-detected rotating body 70 that rotates integrally with the rotating body. The rotating body 70 has eight or more to-be-detected portions 71 equal to the number of one or more cylinders 1a in this case. The rotating body 70, which is a forming body for forming the detected portion 71, projects radially outward with respect to the rim portion 51b and is opposite to the first cover 23 and the end wall 3e in the axial direction. It is provided on the one direction A1 side that is the side.
These detected portions 71 are stepped portions in the radial direction formed on the rotating body 70 by a plurality of protrusions 72 protruding radially outward from the rim portion 51b and spaced apart in the circumferential direction. Consists of.

The protrusion 72 constituting the rotating body 70 and the detected portion 71 protrudes outward in the radial direction from the rim portion 51b around which the belt 42 is wound, and the rim portion 51b has a minute gap G in the axial direction to form the first cover. Opposite to 23. For this reason, with respect to the belt 42 on the rim 51b, the axial movement in one direction A1 is restricted by the rotating body 70 and the detected part 71, and the axial movement in the other direction A2 is restricted by the first cover 23. Thus, an excessive positional shift of the belt 42 in the rim portion 51b is prevented.
The protrusion 72 includes a plurality of first protrusions 72a having the same circumferential length, and a plurality of second protrusions 72b having a circumferential length longer than the first protrusion 72a. The protrusion 72b is formed with a recess 73 recessed in the axial direction to reduce the weight, and the rotating body 70, and thus the intermediate driven pulley 51B, is reduced in weight.
In another example, the intermediate driven pulley 51B and the rotating body 70 may be formed as one member by integral molding.

  In this embodiment, the detected portion 71 is provided corresponding to the rotational position of the crankshaft 5 that is the top dead center position of the piston 6 fitted to the cylinders 1a of both banks B1 and B2. Therefore, the rotation sensor 80 detects the rotational position of the detected portion 71 in order to detect the rotational speed of the camshafts 31 and 32, and also detects the rotational position of the pistons 6 as the rotational states of the camshafts 31 and 32. It also serves as a top dead center sensor that detects the top dead center position.

The rotation sensor 80 is held in a fixed state by a first cover 23 as a holding body that rotatably supports the intermediate rotation member 50. In another example, the rotation sensor 80 may be held by the primary cover 21. Therefore, the first cover 23 and the primary cover 21 constitute a holding member that holds the rotation sensor 80.
The rotation sensor 80 is a magnetic sensor that detects a magnetic change when the detected portion 71 passes in the radial direction, and includes a detection portion 80a that can face the detected portion 71 in the radial direction. The detected portion 71 and the detecting portion 80a face each other with a minute gap G in the radial direction interposed therebetween.
The first cover 23 forms an opening 23o that opens in one direction A1, and the detected portion 71, the gap G, and the detection portion 80a are exposed in the opening 23o when viewed from the axial direction. The primary cover 21 covers the opening 23o from the one direction A1 in the axial direction.

Referring to FIGS. 1 and 2, a cam rotation sensor 81 provided for each of the cam shafts 31 and 32 and held in a fixed state by the second cover 24 is coupled to each of the cam shafts 31 and 32 to rotate integrally. By detecting the rotational positions of four or more cam-side detected portions 83 provided in the cam-side detected rotating body 82 that are equal to the number of cylinders 1a in each of the banks B1 and B2 as a plurality here, The rotational position of each camshaft 31, 32 is detected. Each second rotation sensor 80 is a magnetic sensor in the same manner as the rotation sensor 80.
The rotating body 82 is coupled to the shaft end portions of the cam shafts 31 and 32 by bolts 17 together with the inner rotating bodies 33b and 34b of the phase control mechanisms 33 and 34, and rotates together with the cam shafts 31 and 32.
The control device of the internal combustion engine E sets the opening / closing timing of the intake valve 10 and the exhaust valve 11 in advance according to the engine operating state based on the rotational positions of the cam shafts 31 and 32 detected by the cam rotation sensors 81. The phase control mechanisms 33 and 34 are controlled so that the set timing is reached, and the opening / closing timing is feedback-controlled.

Next, operations and effects of the embodiment configured as described above will be described.
A V-type internal combustion engine E having a rotation sensor 80 for detecting the rotational position of a detected portion 71 provided on a driven rotation member that is rotationally driven by a rotation transmission mechanism T that transmits the rotation of the crankshaft 5 to camshafts 31 and 32. , The rotation transmission mechanism T rotates at a constant speed with each of the cam shafts 31 and 32, and has a rotation center line L1 closer to the crankshaft 5 than the cam center lines Li and Le of the cam shafts 31 and 32. 50, a primary rotation transmission mechanism 40 that transmits the rotation of the crankshaft 5 to the intermediate rotation member 50, and a secondary rotation transmission mechanism 60 that transmits the rotation of the intermediate rotation member 50 to the camshafts 31 and 32. The driven rotating body provided with the detected portion 71 is an intermediate driven pulley 51B of the intermediate rotating member 50 provided in one bank B1.
With this structure, the primary rotation transmission mechanism 40, the intermediate rotation member 50 and the secondary rotation transmission mechanism 60 constituting the rotation transmission mechanism T form a rotation transmission path for transmitting the rotation of the crankshaft 5 to the camshafts 31 and 32. The detected portion 71 detected by the rotation sensor 80 forms the rotation transmission path and is provided on the intermediate rotating member 50 before reaching each of the cam shafts 31 and 32. Therefore, the detected portion detected by the rotation sensor 80 is detected. Since the rotation member for detection, which is a driven rotation member that does not form the rotation transmission path while being provided with the portion 71, is not necessary, the number of parts can be reduced and the cost can be reduced.
In addition, since the intermediate rotation member 50 rotates at the same speed as the cam shafts 31 and 32, the secondary rotation transmission mechanism 60 does not need to be a speed reduction mechanism. The outer diameters of the intake gear 61i and the exhaust gear 61e of the transmission mechanism 60 can be reduced, and the rotation center line L1 of the intermediate rotation member 50 is more crankshaft than the cam center lines Li and Le of the camshafts 31 and 32. Located close to 5. As a result, the intake gear 61i and the exhaust gear 61e of the rotation transmission mechanism T can be reduced in the radial direction around the camshafts 31 and 32. As a result, the cylinder head 3, the head cover 4 and the cover member 20 of the engine body Ea can be reduced. The first and second covers 24 can be reduced in size in the radial direction, and compared with the case where the intermediate rotating member 50 and the intake cam shaft 31 or the exhaust cam shaft 32 are coaxially arranged side by side in the axial direction. The cylinder head 3, the head cover 4, and the first and second covers 23 and 24 in the formed state can be reduced in the axial direction.

  The intermediate driven pulley 51B provided with the detected portion 71 is provided with the detected portion 71 on the first intermediate driven pulley 51A around which the slack side portion of the belt 42 is wound by winding the tight side portion of the belt 42. As compared with the case where the rotation is performed, the rotational position of the detected portion 71 is less affected by the slackness of the belt 42, and the rotational states of the intake and exhaust camshafts 31 and 32 in both banks B1 and B2 can be accurately detected.

  The secondary rotation transmission mechanism 60 includes an intake gear 61i that can rotate integrally with the intake camshaft 31, an exhaust gear 61e that can rotate integrally with the exhaust camshaft 32, and the rotation of the intermediate rotation member 50 to the intake gear 61i and the exhaust gear 61e. By providing the common intermediate gear 62 for transmission, the secondary rotation transmission mechanism 60 allows the rotation of the intermediate rotation member 50 to move at a constant speed through the intermediate gear 62 common to the intake and exhaust camshafts 31 and 32. Since the rotation is transmitted to the rotating intake and exhaust camshafts 31 and 32, the rotation sensor 80 can detect both the rotational states of the intake camshaft 31 and the exhaust camshaft 32 with high accuracy.

The intake camshaft 31 is provided with an intake phase control mechanism 33, the exhaust camshaft 32 is provided with an exhaust phase control mechanism 34, and the intake gear 61i is connected to the intake camshaft 31 via the intake phase control mechanism 33 with an intermediate rotation member. 50, the rotation of the intermediate driven pulley 51 is transmitted, and the exhaust gear 61e transmits the rotation of the intermediate driven pulley 51 to the exhaust camshaft 32 via the exhaust phase control mechanism 34, whereby the intake and exhaust phase control mechanisms 33, 34 are transmitted. Thus, the rotation state of the intake and exhaust camshafts 31 and 32 whose phases with respect to the crankshaft 5 are independently changed can be accurately detected by the rotation sensor 80 regardless of the operating states of the phase control mechanisms 33 and 34.
In addition, the intake and exhaust phase control mechanisms 33 and 34 are downsized in the radial direction of the cam shafts 31 and 32, including the case where the intake and exhaust phase control mechanisms 33 and 34 are provided with the intake and exhaust gears 61i and 61e, respectively. Therefore, the cylinder head 3 and the head cover 4 and the first and second covers 23 and 24 can be reduced in size in the radial direction.

  The holding member constituted by the first and second covers 23 and 24 to hold the rotation sensor 80 is a first integrally formed holding body that holds the rotation sensor 80 and rotatably supports the intermediate rotation member 50. Since the intermediate rotation member 50 provided with the rotation sensor 80 and the detected portion 71 is held by the integrally formed first cover 23 by having the one cover 23, both (that is, the rotation sensor 80 and the detected portion). As compared with the case where the intermediate rotation member 50 provided with 71 is held by separate members, the mutual arrangement accuracy of the rotation sensor 80 and the detected portion 71 is increased, so that the detection accuracy of the rotation sensor 80 is increased. Can do.

  The intermediate rotation member 50 is an intermediate driven pulley 51 that is rotationally driven by the primary rotation transmission mechanism 40, and an intermediate rotation that rotates integrally with the intermediate driven pulley 51 and that transmits the rotation of the intermediate driven pulley 51 to the secondary rotation transmission mechanism 60. The first cover 23, which is a holding member that holds the rotation sensor 80, restricts axial movement of the intermediate drive gear 52. In the intermediate rotating member 50 having the intermediate driven pulley 51B and the intermediate driving gear 52, the detected portion 71 is provided on the intermediate driven pulley 51B, so that the intermediate driving gear 52 can be reduced in size, and 2 The next rotation transmission mechanism 60 can be downsized. In addition, since the axial movement of the intermediate driven pulley 51B is restricted by using the intermediate drive gear 52 whose axial movement is restricted by the first cover 23, the first cover 23 is used to restrict the axial movement of the intermediate driven pulley 51B. The positional deviation between the detected portion 71 and the rotation sensor 80 in the axial direction can be suppressed, and the detection accuracy of the rotation sensor 80 can be improved while eliminating the need for a dedicated restricted portion restricted by the one cover 23.

  The cover member 20 includes a first cover 23 that is an inner cover that covers the intermediate drive gear 52 from 3e of the cylinder head 3 constituting the end Ea1 of the engine body Ea from one axial direction A1, and an intermediate driven pulley. 51B and the primary cover 21 that is an outer cover that covers the first cover 23 in the axial direction from the outer side in the one direction A1, and the rotation sensor 80 can face the detected portion 71 with the gap G interposed therebetween. The first cover 23 has a detection unit 80a, and the detection target unit 71, the gap G, and the detection unit 80a of the rotation sensor 80 are exposed when viewed from the primary cover 21 side (or one direction A1) in the axial direction. By forming the opening 23o, the primary cover 21 covers the opening 23o, and the primary cover 21 is removed, so that the detected portion 71, the gap G, and the detecting portion 80a are open when viewed from the axial direction. Since it is exposed in 23o, the position of the detected portion 71 and the detecting portion 80a is set. It can be accurately the position setting with is facilitated.

Hereinafter, an embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
The winding type rotation transmission mechanism constituting the primary rotation transmission mechanism may be a chain type in which the endless transmission band is a chain and the driving rotating body is a sprocket. In this case, the driven rotation of the intermediate rotation member The body is a driven sprocket. Further, the primary rotation transmission mechanism may be constituted by a gear train. In this case, the driven rotating body of the intermediate rotating member is a driven gear.
One valve operating device may be provided with three or more cam shafts such as first and second intake cam shafts and exhaust cam shafts. In this case, the second cam shaft includes a plurality of cam shafts.
The intermediate drive rotor may be a sprocket or pulley, the secondary intermediate transmission member of the secondary rotation transmission mechanism may be a chain or belt as an endless transmission band, and the cam side rotor may be a sprocket or pulley. The secondary rotation transmission mechanism may be a winding type rotation transmission mechanism.
The internal combustion engine may be a single cylinder internal combustion engine or a series internal combustion engine in which a plurality of cylinders are arranged in a row.
The rotation sensor 80 may be an optical sensor, and the detection unit may be held so as to be opposed to the detected unit in the axial direction.
In the intermediate rotating member, an intermediate driven rotating body may be disposed near the end Ea1 of the engine main body Ea in the axial direction, and an intermediate driving rotating body may be disposed near the cover member 20. In this case, the rotation sensor 80 is held. The holding member may be the end Ea1 to which the cover member 20 is attached.
The detected portion 71 may be provided in the intermediate drive gear 52 of the intermediate rotation member 50.
The phase control mechanism may be provided only on the intake camshaft 31 or only on the exhaust camshaft 32, and may not be provided on either the intake camshaft 31 or the exhaust camshaft 32.
The valve gear may be provided with one common cam shaft that drives the intake valve and the exhaust valve.
Although the internal combustion engine is used for a vehicle in the embodiment, it may be used for a ship propulsion device such as an outboard motor having a crankshaft oriented in the vertical direction.

DESCRIPTION OF SYMBOLS 1 ... Cylinder block, 3 ... Cylinder head, 4 ... Head cover, 5 ... Crankshaft, 20 ... Cover member, 21 ... Primary cover, 22 ... Secondary cover, 23 ... First cover, 23o ... Opening port, 24 ... First 2 covers, 31 ... intake camshaft, 32 ... exhaust camshaft, 33, 34 ... phase control mechanism, 40 ... primary rotation transmission mechanism, 41 ... drive pulley, 42 ... belt, 50 ... intermediate rotation member, 51, 51B ... Intermediate driven pulley, 52 ... intermediate drive gear, 60 ... secondary rotation transmission mechanism, 61i ... intake gear, 61e ... exhaust gear, 62 ... intermediate gear, 71 ... detected portion, 80 ... rotation sensor, 81 ... cam rotation sensor,
E ... Internal combustion engine, Ea ... Engine body, Li, Le ... Cam center line, L1 ... Rotation center line, C ... Cam shaft, T ... Rotation transmission mechanism, G ... Gap.

Claims (6)

An engine body that rotatably supports a crankshaft and a camshaft; a rotation transmission mechanism that transmits rotation of the crankshaft to the camshaft; a cover member that is attached to the engine body and covers the rotation transmission mechanism; An internal combustion engine comprising: a rotation sensor that detects a rotation position of a detected portion provided in a driven rotation member that is rotationally driven by a rotation transmission mechanism; and a holding member that holds the rotation sensor.
The rotation transmission mechanism rotates at a constant speed with respect to the cam shaft and has an intermediate rotation member having a rotation center line closer to the crank shaft than the cam center line of the cam shaft, and rotation of the crank shaft to the intermediate rotation member A primary rotation transmission mechanism that transmits to the camshaft, and a secondary rotation transmission mechanism that transmits the rotation of the intermediate rotation member to the camshaft,
The internal combustion engine, wherein the driven rotating member is the intermediate rotating member. The internal combustion engine of claim 1,
The cam shafts are a first cam shaft and a second cam shaft,
The secondary rotation transmission mechanism rotates a first cam-side rotating body that can rotate integrally with the first cam shaft, a second cam-side rotating body that can rotate integrally with the second cam shaft, and rotation of the intermediate rotating member. An internal combustion engine comprising: a common secondary intermediate transmission member that transmits to the first cam side rotating body and the second cam side rotating body. The internal combustion engine according to claim 2,
The first camshaft is provided with a first phase control mechanism for controlling the phase of the first camshaft with respect to the crankshaft,
The second camshaft is provided with a second phase control mechanism for controlling the phase of the second camshaft with respect to the crankshaft,
The first cam-side rotating body transmits rotation to the first camshaft via the first phase control mechanism,
The internal combustion engine, wherein the second cam-side rotating body transmits rotation to the second cam shaft through the second phase control mechanism. The internal combustion engine according to any one of claims 1 to 3,
The internal combustion engine, wherein the holding member has an integrally formed holding body that holds the rotation sensor and rotatably supports the intermediate rotation member. The internal combustion engine according to any one of claims 1 to 4,
The intermediate rotating member rotates integrally with the intermediate driven rotating body that is rotationally driven by the primary rotation transmitting mechanism and the intermediate driven rotating body, and rotates the intermediate driven rotating body to the secondary rotation transmitting mechanism. An intermediate drive gear for transmission,
The driven rotating member is the intermediate driven rotating body,
The internal combustion engine, wherein the holding member restricts axial movement of the intermediate drive gear. The internal combustion engine according to claim 5,
The holding member is the cover member;
The cover member includes an inner cover that covers the intermediate drive gear between the engine body from the axial direction, and an outer cover that covers the intermediate driven rotating body and the inner cover from the outer side in the axial direction.
The rotation sensor has a detection unit that can be opposed to the detected unit across a gap,
The inner cover, when viewed from the axial direction, forms an opening through which the detected portion, the gap, and the detection portion are exposed,
The internal combustion engine, wherein the outer cover covers the opening.

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