JP2008190361A - Internal combustion engine with auxiliary engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate attachment and detachment work of an auxiliary engine to a cylinder block as an engine body by reduction of fastening parts by a bolt and increase of a freedom degree of a posture of the auxiliary engine in attachment and detachment work. <P>SOLUTION: A water pump 30 of the internal combustion engine E is detachably attached to the cylinder block 1. The water pump 30 is provided with a boss part 51 fastened to an attachment seat 61 on the cylinder block 1 by the bolt 65, and a cylindrical part 52 disposed on the cylinder block 1 in such a manner of being inseparable and inserted into an attachment hole 63 of an attachment wall 62. The cylindrical part 52 is fixed on the attachment wall 62 through a spacer 70 detachably arranged between the attachment wall 62 and the cylindrical part 52 in the attachment hole 63 in the state that the cylindrical part 52 is inserted into the attachment wall 62. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an internal combustion engine provided with an auxiliary machine that is detachably attached to a cylinder block as an engine body, and more specifically to an attachment structure of an auxiliary machine in the internal combustion engine, for example, a water pump.

In an internal combustion engine, a water pump that pumps cooling water is detachably attached to a cylinder block. (For example, see Patent Documents 1 and 2)
JP-A-11-125122 Japanese Patent Laid-Open No. 5-33644

A water pump as an auxiliary machine of an internal combustion engine is usually attached to a cylinder block by a large number of bolts. However, if there are many fastening parts using bolts, it takes time to mount the internal combustion engine during assembly, and the cost increases. And during maintenance of the internal combustion engine, it takes time to remove the water pump.
Further, in order to arrange the water pump compactly in the cylinder block, the water pump may be arranged in a space formed by the cylinder block or the like. In such a case, parts such as auxiliary machines (hereinafter referred to as “peripheral parts”) arranged around the water pump obstruct the mounting or removing operation of the water pump during assembly or maintenance of the internal combustion engine. Sometimes. For this reason, it is desirable to increase the degree of freedom of the posture of the water pump that can be taken during the attachment / detachment work so that the water pump can be attached and detached while avoiding interference with peripheral components.

  The present invention has been made in view of such circumstances, and the inventions according to claims 1 to 4 reduce the number of fastening portions by bolts and increase the degree of freedom of the attitude of the auxiliary machine during mounting / removing work. The purpose of this is to facilitate the attachment / detachment of the auxiliary machine to / from the cylinder block as the engine body. A further object of the present invention is to facilitate the work of attaching / detaching a water pump as an auxiliary machine.

According to a first aspect of the present invention, in the internal combustion engine including an auxiliary machine detachably attached to the cylinder block, the auxiliary machine is fastened with a bolt to a first mounting portion provided in the cylinder block. And a second fixing portion that is inserted into the mounting hole of the second mounting portion that is provided in the cylinder block so as not to be separated, and the second fixing portion is fixed to the second mounting portion by the second fixing portion. An internal combustion engine fixed to the second mounting portion via a spacer detachably disposed between the second mounting portion and the second fixing portion in the mounting hole in a state where the portion is inserted. .
According to a second aspect of the present invention, in the internal combustion engine according to the first aspect, the spacer is formed of a resin member having an engagement portion that engages with the second attachment portion, and the spacer penetrates the attachment hole. The engagement portion is locked to the second attachment portion, and the engagement portion can be reduced in diameter by contact with the second attachment portion in the attachment hole when the spacer is attached to the second attachment portion. There is something.
According to a third aspect of the present invention, in the internal combustion engine according to the first or second aspect, the auxiliary machine is provided with a driven rotating body to which power for driving the auxiliary machine is transmitted, and the inner diameter of the annular spacer is It is larger than the outer diameter of the driven rotating body.
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 auxiliary machine includes a pump housing provided with the first fixed portion and the second fixed portion, and the pump. The pump shaft is rotatably supported by a housing, and the pump housing is larger than the diameter of the mounting hole across the second fixing portion in the rotation axis direction of the pump shaft. It is comprised from a diameter part and a small diameter part smaller than the outer diameter of the said 2nd fixing | fixed part, and the said large diameter part is located near the cylinder axis line of the said cylinder block rather than the said 2nd attachment part.

According to the first aspect of the present invention, the second fixing portion that constitutes the fixing portion of the auxiliary machine that is fixed to the mounting portion of the cylinder block is inserted and fixed to the second mounting portion that does not need to be fastened by a bolt. Therefore, the fastening part for attaching the auxiliary machine is reduced, the auxiliary machine can be easily attached and detached, and the cost can be reduced. Further, in the state before the spacer is arranged, there is a gap A between the second fixing part and the second mounting part in the mounting hole, so that the second fixing part with respect to the mounting hole exists. At the time of insertion and removal, the attitude of the auxiliary machine can be obtained by moving the auxiliary machine in the mounting hole using the gap A even though the second mounting part is provided in the cylinder block so as not to be separated. Therefore, the degree of freedom of the attitude of the auxiliary machine in the attachment / removal work is increased, and the attachment / removal work of the auxiliary machine becomes easy.
According to the second aspect of the present invention, since the engaging portion is reduced in diameter when the engaging portion penetrates the mounting hole in order to engage the engaging portion of the spacer with the second mounting portion, the second mounting portion It becomes easy to mount the spacer on the side, making it easy to mount the auxiliary machine.
According to the third aspect of the present invention, the spacer can be attached and detached between the second mounting portion and the second fixed portion so as to pass through the driven rotating body integrated with the auxiliary device. Installation and removal work becomes easier.
According to a fourth aspect of the present invention, a water pump comprising a pump housing having first and second fixing portions is utilized by utilizing a small diameter portion of a pump housing having an outer diameter smaller than the outer diameter of the second fixing portion. In the state where the small diameter portion is inserted into the mounting hole from the cylinder axis side with respect to the second mounting portion in the rotation axis direction, the water pump is mounted and removed while moving the small diameter portion in the radial direction within the mounting hole. Therefore, the water pump can be attached / detached to / from the cylinder block without dividing the pump housing for attaching / detaching work, and the water pump attaching / detaching work is facilitated.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 and 2, an internal combustion engine E to which the present invention is applied is a V-type 6-cylinder water-cooled internal combustion engine as a vehicular multi-cylinder internal combustion engine, and a rotation axis Le of a crankshaft 13 is a front-rear direction. It is mounted on the vehicle in a vertical arrangement that faces the direction.
In the internal combustion engine E, a plurality of cylinders 1a, in this case, six cylinders 1a are alternately arranged in parallel in the direction of the rotation axis Le of the crankshaft 13 (hereinafter referred to as “rotation axis direction”), and the rotation axis direction A pair of cylinder heads 2 coupled to the upper end of each cylinder row composed of three cylinders 1a, each of the cylinder heads 2 An engine body comprising a pair of head covers 3 coupled to the upper end, a lower block 4 coupled to the lower end of the cylinder block 1, and an oil pan 5 coupled to the lower end of the lower block 4 is provided. Further, a water pump 30 for pumping the cooling water is provided.

  In this embodiment, the rotation axis Lp of the water pump 30 is parallel to the rotation axis Le of the crankshaft 13 and parallel to the front-rear direction. Therefore, the rotation axis direction is the rotation axis direction of the water pump 30 or the rotation axis direction of the crankshaft 13. Then, when one of the front and rear in the front-rear direction in the embodiment is one in the rotation axis direction, the other of the front and rear is the other in the rotation axis direction. Further, in the specification, the radial direction and the circumferential direction are respectively a radial direction and a circumferential direction around the rotation axis Lp of the water pump 30 unless otherwise specified. In the embodiment, the vertical direction is a direction orthogonal to the horizontal plane when the rotation axis Lp is parallel to the horizontal plane, as shown in FIGS. The left-right direction is the same as the left-right direction of the vehicle.

  The lower part 1b of the cylinder block 1, the lower block 4 and the oil pan 5 constitute a crankcase forming a crank chamber 6 in which the crankshaft 13 is accommodated. Each cylinder row, cylinder head 2 and head cover 3 constitute a pair of banks forming a V-shape when viewed from the direction of the rotation axis, and a bank space S is formed by the V-shaped banks.

  Each cylinder 1a is fitted with a piston 11 that is driven by the pressure of the combustion gas generated by the combustion of the air-fuel mixture in the combustion chamber 10 provided in the cylinder head 2 to reciprocate. The piston 11 includes the lower part 1b and the lower part. A crankshaft 13 rotatably supported by the block 4 is rotationally driven via a connecting rod 12. A crank pulley 14 around which a belt of a transmission mechanism for driving an auxiliary machine that drives an auxiliary machine such as an AC generator or an air conditioning compressor is wound is provided at a shaft end 13f on the front side of the crankshaft 13.

  A valve operating apparatus including camshafts 15i and 15e for opening and closing an intake valve and an exhaust valve (both not shown) provided in each cylinder head 2 in synchronization with the rotation of the crankshaft 13 includes a cylinder head 2 and a head cover 3. It arrange | positions in the valve operating chamber formed by. The pair of camshafts 15i and 15e are rotationally driven at half the rotational speed of the crankshaft 13 by the power of the crankshaft 13 transmitted through the valve gear transmission mechanism 16 serving as a transmission mechanism. The valve train transmission mechanism 16 spans a drive sprocket 17 provided at the shaft end 13f, a driven sprocket 18 provided on the intake camshaft 15i of each bank, these sprockets 17 and 18, and a driven sprocket 39 described later. A winding transmission mechanism 16a composed of a silent chain 19 as an endless transmission band, and a cam-shaft transmission mechanism 16b composed of a gear pair provided between the intake camshaft 15i and the exhaust camshaft 15e; Consists of

  A chain cover 7 as a transmission cover is coupled to the front end portions 1f and 2f of the cylinder block 1 and the cylinder head 2 by a large number of bolts (not shown), and these front end portions 1f and 2f are covered by the chain cover 7 from the front. Is called. The chain cover 7 is a chain chamber as a transmission chamber in which the transmission mechanism 16a including the chain 19 is housed and arranged together with the front end portions 1f and 2f, the front end portion 3f of the head cover 3 and the front end portion 4f of the lower block 4. 8 is formed. Further, a cover 9 that covers the opening 7a provided at a position facing the water pump 30 and the driven sprocket 39 in the rotational axis direction is detachably coupled to the chain cover 7 by a bolt.

  The cooling system in which cooling water circulates in the internal combustion engine E includes a water pump 30 as an auxiliary machine driven by the power of the internal combustion engine E, and a block-side water jacket 21 provided in the cylinder block 1 (part of FIG. ), A head side water jacket 22 (a part of which is shown in FIG. 1) provided in the cylinder head 2, a radiator 23, and a number of cooling water passages. A pipe group and a thermostat 25 that controls the flow and shut-off of the cooling water to and from the radiator 23 and the bypass pipe 24 in accordance with the warm-up state of the internal combustion engine E.

  Referring also to FIG. 3, the water pump 30 is disposed in the bank space S and is detachably attached to a mounting seat 61 (see also FIG. 1) provided in the valley 1 c of the cylinder block 1. The water pump 30 rotatably supports the pump shaft 31 via a pump shaft 31 that is rotationally driven by the power of the crankshaft 13, an impeller 32 that rotates integrally with the pump shaft 31, and a bearing 35 that includes a ball bearing. A pump body 33, a pump cover 34 coupled to the pump body 33 by a plurality of bolts 38 (see FIGS. 1 and 5), and a mechanical seal 36 disposed on the pump shaft 31 between the bearing 35 and the impeller 32 And a positioning pin 37 (see FIG. 5) as a positioning part for positioning the water pump 30 with respect to the cylinder block 1 at a preset mounting position. Here, the pump body 33 and the pump cover 34 cooperate to form a pump chamber 41 in which the impeller 32 is accommodated, and constitute a pump housing H.

  In the pump shaft 31 having the rotation axis Lp which is the rotation axis of the water pump 30, the front shaft end 31f of the pump shaft 31 having the impeller 32 coupled to the rear shaft end is provided with power for driving the water pump 30 to rotate. A driven sprocket 39, which is a driven rotating body as an input unit, is coupled. A chain 19 is wound around the driven sprocket 39 disposed in the chain chamber 8 on the back side thereof, and the pump shaft 31 is driven to rotate by the power of the crankshaft 13 transmitted to the driven sprocket 39 via the chain 19. Is done. A tooth portion 39a as a winding portion of the chain 19 in the driven sprocket 39 is in a position overlapping the bearing 35 in the rotation axis direction. The front shaft end 31f of the pump shaft 31 and the front end 39f of the driven sprocket 39 are disposed in the opening 7a.

  Referring to FIGS. 1 and 2, the pump cover 34 has an inlet port 42 through which cooling water from the radiator 23 and the bypass pipe 24 flows through the thermostat 25, and an outlet port through which cooling water pumped by the impeller 32 flows out. 43 is provided. Connected to the pump cover 34 is an inlet pipe 44 that guides the cooling water after passing through the thermostat 25 to the inlet port 42. The inlet pipe 44 is disposed in the bank space S in an integrated state with the water pump 30. The outlet port 43 communicates with the cooling water inflow passage 45 that opens to the mounting seat 61 through the mounting seat 61, and the cooling water from the outlet port 43 passes through the cooling water inflow passage 45 to block the water jacket 21 on the block side of each bank. Distributed to.

  Cooling water that circulates through each block-side water jacket 21 and cools the cylinder block 1 flows into each head-side water jacket 22, cools the cylinder head 2, and then flows out from each cylinder head 2. The pipes 26 connected to each other join together. The cooling water in the pipe 26 flows into the inlet pipe 44 through the bypass pipe 24 opened by the thermostat 25 when the internal combustion engine E is warmed up, and then is sucked into the water pump 30 and flows through the radiator 23 after the internal combustion engine E is warmed up. Then, after radiating heat, it flows into the inlet pipe 44 through the radiator side pipe 27 opened by the thermostat 25 and then sucked into the water pump 30.

  Referring to FIGS. 2, 3, and 5, the water pump 30 includes one or more bolts 65 fastened to a mounting seat 61 as a first mounting portion provided in the valley portion 1 c of the cylinder block 1. Here, from four boss portions 51 as first fixing portions (in FIG. 2, the right boss portion 51 of the two boss portions 51 provided on the left and right is shown) and the trough portion 1c. And a cylindrical portion 52 as a second fixing portion that is inserted into an attachment hole 63 provided in the attachment wall 62 as one second attachment portion that protrudes upward. A mounting hole 63 formed of a circular hole passes through the mounting wall 62 in parallel to the rotation axis direction.

The mounting seat 61 and the mounting wall 62 are integrally formed with the cylinder block 1, and thus are integrated with the cylinder block 1 so as not to be separated. Each boss 51 is integrally formed with the pump cover 34, and the cylinder 52 is integrally formed with the pump body 33. The water pump 30 is fixed to the cylinder block 1 by bolts 65 that are inserted into the through holes provided in the boss portions 51 and screwed into the screw holes provided in the mounting seat 61. Therefore, each boss part 51 is a fastening part by the bolt 65 to the mounting seat 61. In each boss portion 51, the water pump 30 is in a direction perpendicular to the rotation axis direction by the bolt 65 or a plane perpendicular to the plane including the rotation axis Lp, for example, a horizontal plane perpendicular to the vertical direction. It is fastened and fixed in a direction (vertical direction) perpendicular to it.
The cylindrical tube portion 52 having an outer peripheral surface 52o formed of a cylindrical surface is constituted by a part of the pump body 33, and is positioned between the pump chamber 41 and the holding portion 33a that holds the bearing 35 in the rotation axis direction. .

Referring to FIGS. 2 and 3, the cylindrical portion 52 and each boss portion 51 in the water pump 30 are separated from each other in the rotation axis direction with the impeller 32 interposed therebetween, similarly to the mounting wall 62 and the mounting seat 61 in the cylinder block 1. Be placed. More specifically, the cylinder portion 52 and the mounting wall 62 are disposed near the chain 19 that is in front of the impeller 32 in the rotational axis direction, and the cylinder axes L1 and L2 that are behind the impeller 32 (see also FIG. 1). ) Each boss 51 and mounting seat 61 are arranged on the side. The mounting wall 62, which is a part of the front end 1f, is also a part that forms the chain chamber 8 and faces the chain chamber 8. Therefore, each boss part 51 is located closer to the cylinder axis lines L1 and L2 of the cylinder 1a than the cylinder part 52 in the rotation axis direction.
The pump housing H has a large diameter portion Ha larger than the diameter d of the mounting hole 63 (see FIG. 5, which is also the inner diameter of the mounting wall 62) across the cylindrical portion 52, and the cylindrical portion 52 in the rotation axis direction. And the small diameter portion Hb smaller than the diameter d of the mounting hole 63, and the large diameter portion Ha is located closer to the cylinder axis lines L1 and L2 of the cylinder block 1 than the second mounting portion. Here, the large-diameter portion Ha includes a portion where the pump chamber 41, the inlet port 42 and the outlet port 43 are formed in the pump body 33 and the pump cover 34, and the small-diameter portion Hb includes a holding portion 33a. It is.

  The cylindrical portion 52 includes an inner peripheral surface 62i (see FIG. 5) of the mounting wall 62 and an outer peripheral surface 52o of the cylindrical portion 52 in the mounting hole 63 in a state where the cylindrical portion 52 is inserted into the mounting hole 63 in the rotation axis direction. The water pump 30 is fixed to the cylinder block 1 by being held on the mounting wall 62 via a spacer 70 that is detachably disposed between the water pump 30 and the cylinder block 1. For this reason, the diameter d of the mounting hole 63 is larger than the outer diameter of the cylindrical portion 52 by the amount that the spacer 70 is inserted.

  Referring to FIG. 3, the spacer 70 has an annular shape formed radially between the cylindrical portion 52 and the mounting wall 62 in the mounting hole 63 with the water pump 30 positioned at the mounting position. Here, it is fitted to the mounting wall 62 so as to fill the annular gap A. For this reason, the annular spacer 70 is an annular member corresponding to the shape of the gap A, and is entirely constituted by a resin member formed of a synthetic resin. And the cylindrical portion 52 are inserted and fixed to the mounting wall 62, and the cylindrical portion 52 is fixed to the mounting wall 62. The water pump 30 is held in the cylindrical portion 52 over the entire circumference of the cylindrical portion 52 via the spacer 70 by the mounting wall 62.

  The spacer 70 is provided at the distal end portion in the insertion direction into the mounting hole 63 (substantially parallel to the rotation axis direction and is rearward in the front-rear direction), and is a claw portion 71 as an engaging portion that engages with the mounting wall 62. A flange portion 72 as an engaging portion that is provided at the rear end portion in the insertion direction and engages with the mounting wall 62, a seal portion 73 that seals between the mounting wall 62 and the cylindrical portion 52, and a seal A flexible portion 74 having a smaller radial thickness than the portion 73 and elastically deformable radially inward, and the claw portion 71, the collar portion 72, the seal portion 73, and the flexible portion 74 are integrated. It is a molded single member. The seal portion 73 is continuous with the flange portion 72, and the flexible portion 74 is continuous with the seal portion 73 and the claw portion 71. Further, the claw portion 71 and the flange portion 72 have an outer diameter larger than the diameter d of the mounting hole 63, the outer diameters of the seal portion 73 and the flexible portion 74 are the same, and the inner diameter of the flexible portion 74 is the seal portion. It is larger than the inner diameter of 73.

  Further, the spacer 70 has a seal portion 73 that extends between the claw portion 71 and the flange portion 72 in the rotational axis direction and between the inner peripheral surface 70i and the outer peripheral surface 70 in the radial direction over the entire circumference. An annular groove 75 extending and an annular seal groove 76 extending over the entire circumference are provided on the outer peripheral surface 70o. The flexible portion 74 and the claw portion 71 are located radially outward from the annular groove 75. The annular groove 75 makes it easy for the flexible portion 74 and the claw portion 71 to be displaced radially inward when the spacer 70 is attached to and detached from the mounting wall 62. Therefore, the claw portion 71 that is easily displaced radially inward due to the elastic deformation of the flexible portion 74 itself is more easily displaced radially inward by the annular groove 75.

  When inserting and removing the spacer 70 with respect to the gap A, when the claw portion 71 contacts the inner peripheral surface 62i of the mounting wall 62 when passing through the mounting hole 63, a part of the seal portion 73 and the flexible portion 74 are in the radial direction. By elastically deforming inward, the claw portion 71 can be displaced inward in the radial direction, that is, can be reduced in diameter. For this reason, the spacer 70 can be easily attached to and detached from the mounting wall 62.

  Then, the claw portion 71 and the flange portion 72 abut on the mounting wall 62 so as to sandwich the mounting wall 62 from opposite directions in the rotation axis direction, so that the spacer 70 is positioned on the mounting wall 62 in the rotation axis direction. It is locked to the mounting wall 62. Therefore, the claw portion 71 and the flange portion 72 prevent the spacer 70 from moving in the rotational axis direction with respect to the mounting wall 62, and the spacer 70 is fixed to the mounting wall 62 in the mounting hole 63.

  A seal member 77 made of an O-ring is attached to the seal groove 76. The seal member 77 and the seal member 54 made of an O-ring attached to the annular seal groove 53 provided on the outer peripheral surface 52o of the cylindrical portion 52 are respectively connected between the mounting wall 62 and the spacer 70 and the cylindrical portion. The space between the spacer 52 and the spacer 70 is sealed, and the oil atmosphere in the chain chamber 8 is prevented from leaking out of the chain chamber 8. Therefore, the spacer 70 also serves as a seal member that seals between the mounting wall 62 and the cylindrical portion 52.

  Further, the inner diameter of the seal portion 73, which is the inner diameter of the spacer 70, is larger than the outer diameter of the driven sprocket 39 and slightly smaller than the outer diameter of the cylindrical portion 52. Therefore, in the state where the water pump 30 occupies the mounting position, the cylindrical portion 52 is disposed in the mounting hole 63, and the driven sprocket 39 is mounted and integrated with the pump shaft 31, the driven sprocket 39 is the spacer. The spacer 70 can be inserted by being pressed into the gap A so as to penetrate the gap 70, and can be extracted from the gap A. For this reason, the attachment / detachment work of the water pump 30 provided with the driven sprocket 39 is facilitated.

With reference to FIG. 2 and FIG. 4 to FIG. 6, the mounting operation of the water pump 30 will be described.
Referring to FIG. 4, the water pump 30 is a pump unit in which the pump cover 34 is coupled to the pump body 33 and the driven sprocket 39 is attached to the pump shaft 31. The mounting hole 63 is mounted from the radial direction with respect to the center C (see FIGS. 5 and 6) (also in the radial direction with respect to the rotation axis Lp when the water pump 30 occupies the mounting position). It is attached from the open side upward.

The trough portion 1c is provided with an auxiliary machine F as a peripheral part provided in the internal combustion engine E (see FIG. 1) and disposed around the water pump 30. The auxiliary machine F is located at a position where the distance m from the mounting wall 62 in the rotation axis direction is smaller than the width n of the water pump 30 in the rotation axis direction. Therefore, in a state where auxiliary F during assembly or during maintenance of the internal combustion engine E is attached to the cylinder block 1, when the mounting operation of the water pump 30 is performed, a water pump 30 ₀ shown in FIG. 4 by the two-dot chain line In the same manner as the posture of the water pump 30 at the mounting position, the water pump 30 interferes with the auxiliary machine in a posture in which both rotation axes Le and Lp (see FIG. 2) are parallel. Cannot be arranged at the mounting position.

Therefore, the mounting wall 62 is utilized by utilizing the fact that the diameter d of the mounting hole 63 is larger than the outer diameter of the cylindrical portion 52 and the clearance A is formed between the mounting wall 62 and the cylindrical portion 52 in the mounting hole 63. in between the mounting wall 62 at the side opposite to the chain chamber 8 and accessory F respect, water pump 30, as the water pump 30 ₁ indicated by the two-dot chain line, a portion of the driven sprocket 39 or pump In a state where a part of the shaft 31 is located in the mounting hole 63, the rotation axis Lp is inclined with respect to the rotation axis Le. Next, as in the water pumps 30 ₂ , 30 ₃ , and 30 ₄ indicated by the two-dot chain line, the front side of the mounting hole 63 when facing the mounting hole 63 in the radial direction with respect to the center C of the mounting hole 63 (see FIG. 5). The water pump 30 is swung around a position that is radially deviated from the center C, in this case, near the uppermost portion of the mounting hole 63, and the rotation axis Lp rotates. The driven sprocket 39, the pump shaft 31, the small diameter portion Hb, and the cylindrical portion 52 are moved in the radial direction and the rotational axis direction in the mounting hole 63 while the inclination is gradually reduced to be parallel to the axis Le. On the other hand, the driven sprocket 39, the pump shaft 31, and the small diameter portion Hb are gradually and deeply inserted into the mounting hole 63 from the cylinder axis L1, L2 side (see FIG. 2) with respect to the mounting wall 62 in the rotational axis direction. Through the mounting hole 63. In this process, a clearance in the direction of the rotation axis is formed between the water pump 30 and the auxiliary machine by the amount that the driven sprocket 39, the pump shaft 31, the small diameter portion Hb, and the cylindrical portion 52 are inserted into the mounting hole 63. Therefore, the water pump 30 and the auxiliary machine F do not interfere with each other.

  Then, as shown by the solid line in FIG. 4, the cylindrical portion 52 is attached to the water pump 30 in a state where both the rotational axes Le and Lp are parallel and the rotational axis Lp is biased toward the turning center. It is arranged in 63 and occupies a temporary position (see the water pump 30 indicated by a solid line).

  At this time, as shown in FIG. 5, a cylindrical positioning pin 37 that is press-fitted into the pump body 33 is inserted into the positioning hole 1e as an engine body side positioning portion provided in the valley portion 1c of the cylinder block 1. They are opposed to each other with an interval B in the vertical direction that is a direction orthogonal to the rotation axis Lp. For this reason, the stroke for aligning the positioning pin 37 and the positioning hole 1e is ensured by arrange | positioning the water pump 30 in the said temporary position in the process of an attachment operation | work.

  Thereafter, the water pump 30 is moved downward toward the mounting seat 61, and the positioning pin 37 is fitted and aligned with the positioning hole 1e, thereby aligning the center C of the mounting hole 63 with the center C of the mounting hole 63 as shown in FIG. The water pump 30 is positioned at the mounting position in alignment with the rotation axis Lp.

Next, each boss 51 is fastened to the mounting seat 61 by the bolt 65, and the spacer 70 (see FIG. 3) is inserted into the gap A, and the mounting of the water pump 30 is completed. Thereafter, the chain 19 is wound around the driven sprocket 39.
Further, when the water pump 30 is removed, the removal work is performed in the reverse order of the above-described attachment work.

Next, operations and effects of the embodiment configured as described above will be described.
The water pump 30 includes a boss portion 51 fastened by a bolt 65 to a mounting seat 61 provided in the cylinder block 1 and a cylindrical portion inserted into a mounting hole 63 of a mounting wall 62 provided in the cylinder block 1 so as not to be separated. The cylindrical portion 52 is provided via a spacer 70 that is detachably disposed between the mounting wall 62 and the cylindrical portion 52 in the mounting hole 63 in a state where the cylindrical portion 52 is inserted into the mounting wall 62. By fixing to the mounting wall 62, the cylindrical part 52 constituting the fixed part of the water pump 30 fixed to the mounting part of the cylinder block is inserted and fixed to the mounting wall 62 that does not require fastening with bolts. The fastening part by the bolt for attaching the water pump 30 is reduced, the attachment / detachment work of the water pump 30 is facilitated, and the cost is reduced. In addition, in the state before the spacer 70 is disposed on the mounting wall 62, there is a gap A in the mounting hole 63 between the cylindrical portion 52 and the mounting wall 62 so that the spacer 70 is disposed. When the cylindrical portion 52 is inserted into and removed from the 63, the water pump 30 is moved in the mounting hole 63 using the gap A even though the mounting wall 62 is provided in the cylinder block 1 so as not to be separated. Thus, since the posture of the water pump 30 can be changed, the degree of freedom of the posture of the water pump 30 in the mounting / removing operation is increased, and the mounting / removing operation of the water pump 30 is facilitated.

  The water pump 30 is tightened in the boss portion 51 by a bolt 65 in a direction perpendicular to the rotation axis direction, and is held by the mounting wall 62 in the cylinder portion 52 over the entire circumference around the rotation axis Lp. In addition to suppressing vibration of the water pump 30 in the direction orthogonal to and parallel to the rotational axis direction at 65, the mounting wall 62 effectively suppresses vibration of the water pump 30 in the radial direction. The

  The water pump 30 is provided with a driven sprocket 39 to which the power of the crankshaft 13 that drives the water pump 30 is transmitted, and the inner diameter of the spacer 70 is larger than the outer diameter of the driven sprocket 39, so that the water pump 30 is integrated with the water pump 30. Since the spacer 70 can be attached and detached between the mounting wall 62 and the cylindrical portion 52 so as to pass through the driven sprocket 39 formed, the water pump 30 can be easily attached and detached.

  The water pump 30 includes a pump housing H provided with a boss portion 51 and a cylindrical portion 52, and a pump shaft 31 rotatably supported by the pump housing H and attached with a driven sprocket 39. Is composed of a large-diameter portion Ha larger than the diameter d of the mounting hole 63 and a small-diameter portion Hb smaller than the outer diameter of the cylindrical portion 52 across the cylindrical portion 52 in the rotational axis direction. A pump housing H having a boss portion 51 and a cylindrical portion 52 utilizing a small diameter portion Hb having an outer diameter smaller than the outer diameter of the cylindrical portion 52 by being positioned closer to the cylinder axis L1, L2 than the mounting wall 62. In the state where the driven sprocket 39, the pump shaft 31 and a part of the small diameter portion Hb are inserted into the mounting hole 63 from the cylinder axis L1, L2 side with respect to the mounting wall 62 in the rotation axis direction, Installation / removal of the water pump 30 while rotating the driven sprocket 39, the pump shaft 31 and the small diameter part Hb in the mounting hole 63 in the radial direction while turning the water pump 30 around the turning center near the mounting hole 63 Therefore, the water pump 30 can be attached to and detached from the cylinder block 1 without dividing the pump housing H into the pump body 33 and the pump cover 34 for the attachment and removal work. Installation / removal work is facilitated. In addition, since it is possible to dispose the peripheral parts (for example, auxiliary equipment F) disposed around the water pump 30 in the rotation axis direction, the water pump 30 and the peripheral parts are disposed in the bank space S. It can be arranged compactly.

  Further, since it is not necessary to divide the pump housing H when installing / removing the water pump 30 disposed in the bank space S, the water pump 30 in a state where the inlet pipe 44 is integrally connected to the pump cover 34 is provided in the bank. It can be attached to the space S.

The spacer 70 is formed of a resin member having a claw portion 71 that engages with the mounting wall 62, and the spacer 70 is locked to the mounting wall 62 by the claw portion 71 penetrating the mounting hole 63 and is connected to the flexible portion 74. The portion 71 can be reduced in diameter by the flexible portion 74 being elastically deformed radially inward by contact with the mounting wall 62 in the mounting hole 63 when the spacer 70 is attached to the mounting wall 62. In order to engage the claw portion 71 of the 70 with the mounting wall 62, the claw portion 71 is reduced in diameter when the claw portion 71 passes through the mounting hole 63, so that the mounting of the spacer 70 to the mounting wall 62 is facilitated. The water pump 30 can be easily attached and removed.
Further, since the annular groove 75 is provided in the seal portion 73 in the spacer 70, the required sealing performance between the cylindrical portion 52 and the mounting wall 62 by the seal portion 73 is ensured, and the claw portion The diameter of 71 is further reduced, and the water pump 30 can be easily attached and detached.

  The mounting wall 62 is formed integrally with the cylinder block 1, and the spacer 70 is locked to the mounting wall 62 by the claw portion 71 and the flange portion 72, thereby fastening with a bolt for fixing the mounting wall 62 to the cylinder block 1. Is not necessary, and fastening with bolts for attaching the spacer 70 to the mounting wall 62 is also unnecessary, thereby reducing the number of fastening work accompanying the installation / removal work of the water pump 30 and contributing to cost reduction. .

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.
In addition to the water pump, the auxiliary machine in the present invention may be an auxiliary machine driven by the power of the internal combustion engine, for example, an oil pump, a generator or a compressor, and further an auxiliary machine not driven by the power of the internal combustion engine. May be. When the auxiliary machine is driven by the power of the internal combustion engine, the transmission mechanism may be an auxiliary machine driving transmission mechanism instead of the valve driving transmission mechanism.
The transmission mechanism 16a may be a belt-type transmission mechanism including a belt as an endless transmission band instead of a chain.
The shape of the mounting hole 63 or the cross-sectional shape of the inner peripheral surface 62i of the mounting wall 62 or the cross-sectional shape of the outer peripheral surface 52o of the cylindrical portion 52 may be a shape other than a circle such as a polygon. It may be an annular shape other than a ring.
The internal combustion engine may be a V-type engine other than 6 cylinders, a multi-cylinder internal combustion engine other than V-type, or a single-cylinder internal combustion engine. Moreover, although the internal combustion engine is used for a vehicle in the embodiment, it may be used for a ship propulsion apparatus such as an outboard motor having a crankshaft oriented in the vertical direction.

1 is a schematic overall view of an internal combustion engine to which the present invention is applied as viewed from the front. In the internal combustion engine of FIG. 1, it is a principal part sectional drawing in the plane containing the rotation axis of a crankshaft, and the rotation axis of a water pump schematically. It is an enlarged view centering on the water pump of FIG. It is a figure explaining the installation operation | work of the water pump of FIG. 2 is a front view of the main part when the water pump is in a temporary position during the installation work of the water pump. It is a principal part front view before a water pump exists in an attachment position at the time of attachment work of the water pump of FIG. 2, and a spacer is mounted | worn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder block, 7 ... Chain cover, 8 ... Chain chamber, 16 ... Transmission mechanism, 19 ... Chain, 30 ... Water pump, 31 ... Pump shaft, 32 ... Impeller, 33 ... Pump body, 34 ... Pump cover, 39 ... Driven sprocket, 51 ... Boss, 52 ... Cylinder, 61 ... Mounting seat, 62 ... Mounting wall, 63 ... Mounting hole, 70 ... Spacer, 71 ... Claw, 72 ... Hut,
E: Internal combustion engine, Le, Lp: Axis of rotation, S: Bank space, H: Pump housing, Ha: Large diameter portion, Hb: Small diameter portion, A: Clearance.

Claims (4)

In an internal combustion engine including an auxiliary machine detachably attached to a cylinder block,
The auxiliary machine is inserted into a first fixing portion fastened by a bolt to a first mounting portion provided in the cylinder block and a mounting hole in the second mounting portion provided in the cylinder block so as not to be separated. A second fixing portion, wherein the second fixing portion is formed between the second mounting portion and the second fixing portion in the mounting hole in a state where the second fixing portion is inserted into the second mounting portion. An internal combustion engine fixed to the second mounting portion via a spacer detachably disposed therebetween.   The spacer is formed of a resin member having an engaging portion that engages with the second attaching portion, and the spacer is locked to the second attaching portion by the engaging portion that penetrates the attaching hole, 2. The internal combustion engine according to claim 1, wherein the joint portion can be reduced in diameter by contact with the second attachment portion in the attachment hole when the spacer is attached to the second attachment portion.   2. The driven machine according to claim 1, wherein the auxiliary machine is provided with a driven rotary body to which power for driving the auxiliary machine is transmitted, and an inner diameter of the annular spacer is larger than an outer diameter of the driven rotary body. 3. The internal combustion engine according to 2.   The auxiliary machine is a water pump including a pump housing provided with the first fixed part and the second fixed part, and the pump shaft rotatably supported by the pump housing. In the rotational axis direction of the pump shaft, the large diameter portion is configured with a large diameter portion larger than the diameter of the mounting hole across the second fixed portion and a small diameter portion smaller than the outer diameter of the second fixed portion. The internal combustion engine according to any one of claims 1 to 3, wherein the portion is located closer to a cylinder axis of the cylinder block than the second mounting portion.

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