JP2011038492A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor including a movable scroll inserted into a rotating shaft with an oil seal on the inserting direction side of a movable scroll previously assembled to a boss portion. <P>SOLUTION: The rotating shaft 101 is rotatably supported with respect to front and rear fixed scrolls 115F, 115R, the boss portion 122 of the movable scroll 116 is turnably journalled to the eccentric shaft portion 126 of the rotating shaft 101 through a needle bearing 130, a shim 170 is provided for axially positioning the eccentric shaft portion 126, and an oil seal 139 is provided between the boss portion 122 and the eccentric shaft portion 126. The eccentric shaft portion 126 is constituted of: a large diameter portion 135 on the side in the inserting direction of the movable scroll 116; and a small diameter portion 131 on a side opposite to the inserting direction of the movable scroll 116. The oil seal 139 on the side in the inserting direction of the movable scroll 116 is supported by the large diameter portion 135, the shim 170 is supported by the small diameter portion 131, and the position of the shim 170 is regulated by a stepped portion d between the large diameter portion 135 and the small diameter portion 131. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a scroll compressor.

Some scroll compressors have a structure in which a needle bearing that supports the boss portion of the movable scroll is arranged at the center in the longitudinal direction of the rotating shaft, and an oil seal is attached so as to sandwich the needle bearing (Patent Document). 1).
An example of this will be described with reference to FIG. 7. The rotating shaft 200 is provided with an eccentric shaft portion 201, and a boss portion 203 constituting the shaft portion of the movable scroll 202 is supported on the eccentric shaft portion 201 so as to be able to revolve without rotating. ing. A pair of needle bearings 204 is provided between the eccentric shaft portion 201 and the boss portion 203 of the rotary shaft 200, and both sides of the needle bearing 204 are provided to restrict the position of the boss portion 203 of the movable scroll 202 in the thrust direction. A bushing 205 is sandwiched between them, and a circlip 207 is attached to the outside of each bushing 205 via a shim 206. An oil seal 208 is provided outside the circlip 207 to prevent the lubricating oil from flowing out.

Japanese Patent Laid-Open No. 4-81588

  However, in the scroll compressor described above, the oil seal 208 on the back side of the boss portion 203 to be fitted to supply oil to the shaft portion, that is, the insertion direction side of the movable scroll 202 is assembled to the boss portion 203 of the movable scroll 202 in advance. In this state, it is necessary to fit the boss portion 203 of the movable scroll 202 in the direction of the arrow on the outer side of the rotating shaft 200, but at least the circlip 207 is attached to the boss portion 203 in order from the back side of the boss portion 203 to be fitted. In the state, the boss portion 203 of the movable scroll 202 cannot be fitted into the rotating shaft 200.

  Therefore, the oil seal 208 is fitted in the back side of the rotary shaft 200 in advance, and the back side oil seal 208 is attached between the boss portion 203 and the rotary shaft 200 after the boss portion 203 is attached to the rotary shaft 200. However, it is difficult to perform work when there is not enough work space to attach the oil seal 208 between the boss portion 203 and the rotary shaft 200 at the base portion of the rotary shaft 200. .

  Therefore, the present invention is a scroll type in which the movable scroll can be inserted into the rotary shaft in a state where the oil seal on the movable scroll insertion direction side is previously assembled to the boss portion of the movable scroll while regulating the movable scroll in the axial direction. An object is to provide a compressor.

  In order to achieve the above object, the invention described in claim 1 is directed to a fixed scroll (for example, front and rear fixed scrolls 115F and 115R in the embodiment) provided with a spiral blade (for example, the spiral blade 120 in the embodiment). A rotating shaft (for example, the rotating shaft 101 in the embodiment) is rotatably supported, and a spiral blade (for example, the spiral blade in the embodiment) is provided on an eccentric shaft portion (for example, the eccentric shaft portion 126 in the embodiment) provided on the rotating shaft. 121) of a movable scroll (for example, movable scroll 116 in the embodiment) having a boss (for example, the boss portion 122 in the embodiment) is pivotable through a scroll bearing (for example, the needle bearing 130 in the embodiment). Positioned in the axial direction with respect to the eccentric shaft portion of the movable scroll. A scroll provided with a shim (for example, shims 137 and 170 in the embodiment) and provided with an oil seal (for example, the oil seal 139 in the embodiment) between the boss portion of the movable scroll and the eccentric shaft portion of the rotating shaft. In the type compressor (for example, the supercharger 45 in the embodiment), the eccentric shaft portion of the rotating shaft is movable with the large diameter portion (for example, the large diameter portion 135 in the embodiment) on the insertion direction side of the movable scroll. A small-diameter portion opposite to the scroll insertion direction (for example, the small-diameter portion 131 in the embodiment), the oil seal on the insertion direction side of the movable scroll is supported by the large-diameter portion, and the shim is supported by the small-diameter portion. The shim is supported by a step portion (for example, a step portion d in the embodiment) supported by the portion and formed by the large diameter portion and the small diameter portion. And performing position regulation.

  In the invention described in claim 2, the scroll bearing is supported by the large-diameter portion, the shim is provided on the side opposite to the insertion direction of the movable scroll, and the shim (for example, the shim 170 in the embodiment) is moved. A flange portion (for example, the flange portion 171 in the embodiment) having an outer peripheral diameter substantially the same as the inner peripheral diameter of the boss portion of the scroll and having a side surface in contact with the stepped portion, and a diameter smaller than the flange portion, the movable It is formed by a ring part (for example, ring part 172 in the embodiment) protruding to the opposite side to the scroll insertion direction.

According to a third aspect of the present invention, the rotating shaft is disposed coaxially with a crankshaft (for example, the crankshaft 20 in the embodiment) of an internal combustion engine (for example, the internal combustion engine E in the embodiment), and a joint ( For example, a casing (for example, a supercharger casing 109 in the embodiment) that is driven through the joint 103 in the embodiment and coupled to a crankcase (for example, the crankcase 31 in the embodiment) is provided. It is characterized by.
According to a fourth aspect of the present invention, an oil supply passage (for example, the oil supply passage 123 in the rotation shaft in the embodiment) is formed in the eccentric shaft portion of the rotation shaft, and the eccentric shaft portion faces the inner peripheral surface of the shim. An oil passage (for example, the oil passage 145 in the embodiment) is formed.
According to a fifth aspect of the present invention, a small inner diameter portion (for example, the small inner diameter portion 132 in the embodiment) is formed on the inner side of the boss portion of the movable scroll at a position corresponding to the position of the scroll bearing. A large inner diameter portion (for example, a large inner diameter portion 133 in the embodiment) on both sides of the portion, and a seal mounting portion (for example, a seal mounting in the embodiment) having a larger diameter than the large inner diameter portion in the opening at the front and rear ends of the boss portion. The portion 134) is formed to correspond to the large diameter portion of the eccentric shaft portion (for example, the large diameter portion 135 in the embodiment).

According to the first aspect of the present invention, since the step portion that performs thrust regulation in the insertion direction of the movable scroll is smaller than the inner diameter of the oil seal, the oil seal on the insertion direction side of the movable scroll is previously connected to the boss portion of the movable scroll. The boss part of the movable scroll can be inserted into the rotating shaft in the state that it is installed in the shaft, so that the inner edge of the oil seal does not contact the small diameter part of the rotating shaft or the contact pressure is low, and the load on the oil seal And the lubricating oil can be supplied by sealing the scroll bearing of the boss portion of the movable scroll from the air pressurizing chamber.
According to the second aspect of the present invention, when the shim is replaced, it is not necessary to remove the boss of the movable scroll from the rotating shaft, and the shim can be removed simply by removing the oil seal on the side opposite to the insertion direction of the movable scroll. Since it can be removed, workability can be improved.
According to the third aspect of the present invention, the crankshaft and the rotary shaft can be connected by a joint while being easy to assemble the movable scroll, so that the internal combustion engine having the compressor is compactly configured. it can.
According to the invention described in claim 4, friction between the shim and the eccentric shaft portion can be reduced, and the operability of the movable scroll can be improved.
According to the fifth aspect of the present invention, it is possible to facilitate the positioning of the scroll bearing, shim, and oil seal.

It is side surface explanatory drawing of the four-wheel buggy vehicle of 1st, 2nd embodiment of this invention. It is a top view of FIG. It is sectional drawing of the engine of embodiment of this invention. FIG. 4 is a partially enlarged sectional view of FIG. 3. It is a partial expanded sectional view of FIG. It is sectional drawing equivalent to FIG. 5 of 2nd Embodiment. It is sectional drawing of a prior art.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a four-wheel saddle-ride type vehicle equipped with an internal combustion engine with a supercharger according to an embodiment of the present invention, and FIG. 2 is a plan view of the same. In the vehicle 1, a pair of left and right front wheels FW on which low-pressure balloon tires for running on rough terrain are mounted and a pair of left and right rear wheels RW on which balloon tires are similarly mounted are suspended in front and rear of the body frame 2.

  The body frame 2 has a pair of left and right main frames 3 and 3 extending in the front-rear direction from the front to the rear of the body, and forms a parallelogram-like frame in side view with the center of the main frames 3 and 3 as the upper side. Center frame portions 4 and 4 are provided, and the main frames 3 and 3 and the center frame portions 4 and 4 support a power unit P in which the internal combustion engine E and the transmission T are integrally formed in the crankcase 31.

  Front frame portions 5 and 5 are connected to the front portions of the main frames 3 and 3 and the center frame portions 4 and 4, and front wheels FW are suspended on the front frame portions 5 and 5. The rear portions of the main frames 3 and 3 that support the saddle riding seat 7 are supported by rear frame portions 6 and 6 that are interposed between the rear lower ends of the center frame portions 4 and 4.

  A swing arm 9 whose front end is pivotally supported is pivotably provided on a pivot plate 8 fixed to a bent portion at the rear lower end of the center frame portion 4, and a rear portion between the rear portion of the swing arm 9 and the main frame 3 is provided. A cushion 10 is interposed, and a rear wheel RW is suspended from a rear final reduction gear unit 19 provided at the rear end of the swing arm 9.

  A head pipe 11 is supported at the center in the width direction of the cross member laid between the left and right front frame parts 5, 5, and a steering handle 13 is attached to the upper end part of the steering shaft 12 that is operably supported by the head pipe 11. And the lower end of the steering shaft 12 is connected to the front wheel steering mechanism 14.

  The internal combustion engine E of the power unit P is a water-cooled single-cylinder internal combustion engine, and is mounted on the center frame portion 4 in a vertically placed state in which the crankshaft 20 (see FIG. 3) is oriented in the longitudinal direction of the vehicle body. The crankshaft 20 is positioned on the rear side of the crankcase 31 and slightly to the right of the center of the vehicle body, and a supercharger 45 is disposed behind the crankshaft 20.

  The transmission T of the power unit P is arranged on the left side of the internal combustion engine E, and the output shaft 15 oriented in the front-rear direction protrudes from the transmission T near the left side. It is transmitted from the front end of the shaft 15 to the left and right front wheels FW via the front drive shaft 16 and the front final reduction gear unit 17, and from the rear end to the left and right rear wheels RW via the rear drive shaft 18 and the rear final reduction gear unit 19. Communicated.

A fuel tank 21 is suspended and supported above the power unit P at the front of the main frames 3 and 3 of the vehicle body frame 2, and a battery 22 is suspended from the rear of the main frames 3 and 3. A radiator 23 is supported at 5 and 5.
An air cleaner 41 is installed at the rear end of the main frames 3 and 3 behind the battery 22.

The internal combustion engine E is erected in a state where the cylinder block 32, the cylinder head 33, and the cylinder head cover 34 are sequentially stacked on the crankcase 31 and inclined slightly to the left (see also FIG. 3), and extends rearward from the cylinder head 33. A throttle body 55 is connected to the short intake pipe 56, and an intercooler 50 is disposed close to the throttle body 55 immediately after the throttle body 55, and the throttle body 55 and the intercooler 50 are connected by an intake connection pipe 54.
Here, the throttle body 55 and the intercooler 50 are located between the left and right main frames 3 and 3 and are located below the saddle riding seat 7 in a plan view.

The intercooler 50 has a structure that is divided into two parts in the front and rear, and an attachment stay 53 is provided on the upper part of the flange portion of the mating surface, and is attached so that the attachment stay 53 straddles the cross member 3c installed on the main frames 3 and 3. The main frames 3 and 3 are suspended below. The intercooler 50 is located above the supercharger 45 and is at a height position close to the lower surface of the main frame 3 in a side view.
The intercooler 50 is a rectangular device that fits between the main frames 3 and 3 and is disposed in the longitudinal direction on the left half, and a rectangular container that swells to the right on the rear side constitutes the suction side expansion chamber 50I. A rectangular container that swells to the right side forms a discharge-side expansion chamber 50E.

A throttle body 55 is connected to the front side of the discharge side expansion chamber 50E of the intercooler 50 via an intake connection pipe 54, and a discharge port of the supercharger 45 is connected to the lower side of the suction side expansion chamber 50I via a connection pipe 49. Yes.
The cooling water inlet 51i protrudes forward in the intercooler 50, the cooling water outlet 51e protrudes rearward, and the radiator hose 24 to which the cooling water from the radiator 23 is supplied is connected to the inlet 51i. A cooling water hose 25 is connected to 51e. The cooling water hose 25 is bent rightward and then bent forward to extend forward on the right side of the intercooler 50, the throttle body 55 and the cylinder head 33, and bent downward to be crankcase. 31 is connected to the cooling water inlet 31 i of the crankcase 31.

  A thermostat 26 is disposed on the left front portion of the cylinder head 33, and coolant circulating through the cylinder block 32 and the cylinder head 33 is guided from the crankcase 31 to the thermostat 26, and between the thermostat 26 and the front radiator 23. A radiator hose 27 is connected.

  An intake coupling pipe 42 is connected between the suction port 45 i of the supercharger 45 and the air cleaner 41. Further, the discharge port 45e of the supercharger 45 is connected to the suction side expansion chamber 50I of the intercooler 50 via a discharge connecting pipe 48 and a connecting pipe 49.

  3 is a cross-sectional view of the internal combustion engine and the supercharger, and FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 3 and 4, the crankcase 31 of the internal combustion engine E includes a crank casing 35, a front crankcase cover 36, and a rear crankcase 37. The crankshaft 20 is supported by the crank casing 35 so that the crank journals 38 and 38 are rotatably supported by ball bearings 39 and 39, and the front end of the crankshaft 20 can be rotated by the front crankcase cover 36 via the ball bearing 40. It is supported.

  A piston 46 is connected to the crankshaft 20 via a connecting rod 43 and a crankpin 44, and the piston 46 is slidably fitted to a cylinder bore 47 of the cylinder block 32. A combustion chamber 59 communicating with an intake port 57 and an exhaust port 58 formed in the cylinder head 33 is formed between the upper surface of the piston 46 and the cylinder head 33. The push rod 60 is driven by rotation of a camshaft (not shown). The intake valve 62 and the exhaust valve 63 open and close the intake port 57 and the exhaust port 58 via the rocker arm 61.

A centrifugal clutch 65 is mounted in the front crankcase cover 36 via a one-way clutch 66 on the front end side of the crankshaft 20.
The centrifugal clutch 65 includes a drive plate 67 fixed to the crankshaft 20, a hook-shaped clutch housing 69 that coaxially covers the drive plate 67 so as to rotate together with a drive gear 68 that is mounted on the crankshaft 20 so as to be relatively rotatable. The clutch weight 70 is rotatably supported on the drive plate 67 so as to be frictionally engageable with the inner periphery of the clutch housing 69 in accordance with the action of the centrifugal force accompanying the rotation of the crankshaft 20. The one-way clutch 66 is provided between the clutch housing 69 and the drive plate 67 so that power can be transmitted from the drive gear 68 to the crankshaft 20.

  A main shaft 72 is supported on the crank casing 35 via ball bearings 73 and 73 so as to be rotatable in parallel with the crankshaft 20. A multi-plate clutch 74 is disposed at the front end portion of the main shaft 72. The clutch outer 75 of the clutch 74 includes a driven gear 76 that meshes with the drive gear 68 of the crankshaft 20, and a clutch inner 77 of the clutch 74 is connected to the main shaft 72 so as to be integrally rotatable. The clutch inner 77 and the clutch outer 75 are provided with a plurality of clutch plates 78, 78... By frictionally joining the clutch inner 77 and the plurality of clutch plates 78, 78. The power is connected to 72. The main shaft 72 includes a sub-shaft 80 that is coaxial with the front end and supports the clutch inner 77 with a ball bearing 79.

A counter shaft 82 is supported on the crank casing 35 via ball bearings 83 and 84 so as to be rotatable in parallel with the crank shaft 20.
The main shaft 72 and the counter shaft 82 are provided with a drive side gear group 85 and driven side gear groups 86, 86 that are selectively meshed with each other. The drive side gear group 85 of the main shaft 72 and the counter shaft 82 are driven. A transmission T is constituted by the side gear group 86.
An output shaft 88 that transmits power to the front wheel FW and the rear wheel RW is supported on the crank casing 35 via ball bearings 89 and 89 so as to be rotatable in parallel with the crankshaft 20. The output shaft 88 includes a driven gear 91 that meshes with the drive gear 90 of the counter shaft 82.

A generator 92 is connected to the rear end of the crankshaft 20 in the rear crankcase 37, and a starter motor 93 is linked above the crankshaft 20. The generator 92 includes an outer rotor 94 that rotates together with the crankshaft 20 and a stator 95 that is fixed to the rear crankcase 37. A gear 96 is linked to the output shaft of the starter motor 93, and this gear 96 is linked to the crankshaft 20 via a driven gear 97 provided on the crankshaft 20, a one-way clutch 98 and an outer rotor 94 of the generator 92. .
Here, the generator 92 is accommodated in a generator chamber 99 partitioned by a partition wall 100 inside the rear crankcase 37.

  A joint housing chamber 102 is formed in the crankcase 37 after being separated by the partition wall 100 at the rear of the partition wall 100 adjacent to the generator chamber 99. A joint 103 is housed in the joint housing chamber 102, and the rotary shaft 101 of the supercharger 45 is coaxially connected to the rear end of the crankshaft 20 via the joint 103. In the joint 103, the driving coupler 104 on the crankshaft 20 side and the driven coupler 105 on the rotating shaft 101 side of the supercharger 45 are engaged with each other via the elastic member 106, and the rotational driving force of the crankshaft 20 is applied to the rotating shaft 101 of the supercharger 45. A balancer 107 is attached to the driven coupler 105 to ensure a dynamic balance of the supercharger 45.

  The supercharger 45 is a scroll type compressor and includes a supercharger casing 109 coupled to the rear crankcase 37 by a bolt 108. The opening of the rear crankcase 37 is closed by a bottom wall 109 a (described later) of the supercharger casing 109, and the joint housing chamber 102 is separated from the partition wall 100. The supercharger casing 109 has a front and rear split structure, and both are integrally fixed by bolts (not shown). The rotating shaft 101 connected to the crankshaft 20 by the joint 103 is rotated to the supercharger casing 109 by the ball bearing 110 at the end on the crankshaft 20 side and by the needle bearing 111 at the end opposite to the crankshaft 20. Supported as possible.

  Here, an oil supply passage 112 in the crankshaft is formed inside the crankshaft 20, and lubricating oil fed from a lubricating oil pump (not shown) is supplied to the inner periphery of the drive gear 68 of the centrifugal clutch 65, around the crankpin 44. Can be supplied. A main shaft oil supply passage 113 and an output shaft oil supply passage 114 are also formed inside the main shaft 72 and the output shaft 88, respectively.

As shown in FIG. 4, the supercharger casing 109 includes front and rear fixed scrolls 115F and 115R facing each other in a pair, and a movable scroll 116 that turns between the front and rear fixed scrolls 115F and 115R is interposed.
The front fixed scroll 115F extends rearward from the bottom wall 109a of the turbocharger casing 109 along the axial direction of the rotary shaft 101, and has an involute curve having a sealing material 118 that contacts the front surface of the flat plate portion 117 of the movable scroll 116 at the end. And a sealing material 118 that extends forward from the lid portion 109b of the turbocharger casing 109 along the axial direction of the rotary shaft 101 and contacts the rear surface of the flat plate portion 117 of the movable scroll 116 at the end. And a spiral blade 120 having the following.

  The front end of the rotary shaft 101 is rotatably supported by a ball bearing 110 on the bottom wall 109a of the supercharger casing 109, and the rear end of the rotary shaft 101 can be rotated by a needle bearing 111 on the lid 109b of the supercharger casing 109. It is supported by. Therefore, the rotating shaft 101 is supported rotatably with respect to the front and rear fixed scrolls 115F and 115R.

  The movable scroll 116 includes spiral blades 121 and 121 formed in an involute curve having sealing members 118 at the ends thereof in contact with the bottom wall 109a and the lid portion 109b of the front and rear fixed scrolls 115F and 115R, before and after the flat plate portion 117, respectively. A cylindrical boss 122 is provided at the center. The boss portion 122 of the movable scroll 116 is moved to the eccentric shaft portion 126 of the rotary shaft 101 with respect to the front fixed scroll 115F so that the spiral blade 121 of the movable scroll 116 meshes between the spiral blades 119 and 120 of the front and rear fixed scrolls 115F and 115R. The rear fixed scroll 115R is finally attached, and the movable scroll 116 is assembled to the front and rear fixed scrolls 115F and 115R so as to be turnable.

  The supercharger 45 includes three auxiliary rotary shafts (see FIG. 3 and FIG. 4) arranged at 120 degrees around the supercharger casing 109 in addition to the rotary shaft 101 at the center of the turbocharger casing 109 described above. 125 is provided in parallel with the rotation axis 101. As described above, the rotating shaft 101 is rotatably supported by the supercharger casing 109 via the ball bearing 110 and the needle bearing 111 at both ends, and includes an eccentric shaft portion 126 at a substantially central portion in the longitudinal direction. The eccentric shaft portion 126 is formed with a hole 126a along the axial direction for rotational balance.

  The auxiliary rotating shaft 125 is rotatably supported by the supercharger casing 109 via a pair of ball bearings 127 and 127, and the eccentric direction of the eccentric shaft portion 126 of the rotating shaft 101 is at the rear end of the auxiliary rotating shaft 125. The auxiliary eccentric shaft 128 offset so as to align with the auxiliary rotating shaft 125 is connected to the auxiliary rotating shaft 125 in a state of being bent in a crank shape from the auxiliary rotating shaft 125, and the flat plate portion of the movable scroll 116 via the pair of ball bearings 129 and 129. 117 is rotatably supported.

  The inner periphery of the boss portion 122 of the movable scroll 116 is turnably fitted to the eccentric shaft portion 126 of the rotating shaft 101, and the movable scroll 116 is supported to rotate freely without rotating relative to the eccentric shaft portion 126 of the rotating shaft 101. The auxiliary eccentric shaft 128 of the auxiliary rotary shaft 125 is rotatably supported by the flat plate portion 117 of the movable scroll 116, thereby allowing the movable scroll 116 to turn. The eccentric shaft portion 126 of the rotating shaft 101 has a large-diameter portion 135 on the crankshaft 20 side, that is, the insertion direction side of the movable scroll 116 with respect to the rotating shaft, and a movable scroll 116 having a smaller diameter than the large-diameter portion 135 through a step portion d. The small-diameter portion 131 is formed up to the rear end portion on the opposite side to the insertion direction with respect to the rotation axis. A pair of needle bearings 130, 130 are interposed between the small diameter portion 131 and the boss portion 122 of the movable scroll 116.

  When the movable scroll 116 orbits by the rotary shaft 101 and the auxiliary rotary shaft 125, the fixed-side spiral blade 119, the movable-side spiral blades 121 and 121, the bottom wall 109a of the supercharger casing 109 and the lid portion facing each other. The compression chamber surrounded by 109b moves sequentially from the outer peripheral side to the central side while reducing its volume. The air sucked from the suction port 45i into the outermost peripheral compression chamber is gradually compressed and finally becomes high pressure at the center and discharged from the discharge port 45e at the center of the rear fixed scroll 115R on the rear end side.

  As shown in FIG. 5, a small inner diameter portion 132 is formed inside the boss portion 122 of the movable scroll 116 at a position corresponding to the position where the needle bearing 130 is disposed, and a large inner diameter portion 133 is further formed on both sides thereof. A seal mounting portion 134 having a diameter larger than that of the large inner diameter portion 133 is formed in the opening at the front and rear ends of 122 corresponding to the large diameter portion 135 of the eccentric shaft portion 126.

A copper bushing 136 for positioning the eccentric shaft 126 of the movable scroll 116 is mounted on the front and rear sides of the needle bearings 130, 130, and shims 137 are mounted on the front and rear sides of the copper bushing 136. The front shim 137 is regulated by the stepped portion d and supported by the small diameter portion 131 of the eccentric shaft portion 126 of the rotating shaft 101, and the rear shim 137 is adjacent to the shim 137 on the side opposite to the crankshaft 20. The position is regulated by
An oil seal 139 is disposed at both ends of the boss portion 122 of the movable scroll 116, the front oil seal 139 is supported by the boss portion 122 of the movable scroll 116, and the large diameter of the eccentric shaft portion 126 of the rotating shaft 101. Sealing between the part 135 and the seal mounting part 134 at the front part of the boss part 122, the rear oil seal 139 is also supported by the boss part 122 of the movable scroll 116, and the small diameter part 131 of the eccentric shaft part 126 of the rotary shaft 101. And the seal mounting part 134 at the rear part of the boss part 122 are sealed.

  A lid portion 109b at the rear end of the supercharger casing 109 is provided with a suction port 45i on the outer upper portion, and a discharge that communicates with the periphery of the boss portion 122 of the movable scroll 116 around the needle bearing 111 at the center portion of the lid portion 109b. A port 45e is provided. The suction port 45i is connected to the air cleaner 41 via the intake connecting pipe 42, and the discharge port 45e is connected to the suction side expansion chamber 50I (see FIG. 2) of the intercooler 50 via the discharge connecting pipe 48 and the connecting pipe 49. .

  Inside the rotating shaft 101, an in-rotating shaft oil supply passage 123 is formed along the longitudinal direction of the rotating shaft 101. A connecting pipe 140 is arranged in the crankshaft oil supply passage 112 of the crankshaft 20 and the rotation shaft oil supply passage 123 of the rotary shaft 101. The connecting pipe 140 includes oil seals 141 and 141 provided at a rear end portion of the crankshaft oil supply passage 112 of the crankshaft 20 and a front end portion of the oil supply passage 123 within the rotation shaft of the rotary shaft 101, and a bush 156 at the rear end portion. Thus, the outer peripheral surface is sealed and extends from the rear end portion of the crankshaft 20 to the rear end portion of the rotary shaft 101. Around the connecting pipe 140, an annular connecting pipe external oil supply passage 142 is formed in the rotary shaft 101, and the connecting pipe external oil supply path 142 and the connecting pipe 140 are formed by a communication hole 143 formed in the rear end portion of the connecting pipe 140. The connecting pipe internal oil supply passage 144, that is, the crankshaft internal oil supply passage 112 is connected in communication.

Therefore, the connecting pipe oil supply passage 144 and the connecting pipe oil supply passage 142 communicate with each other on the side opposite to the crankshaft 20 with the needle bearings 130 and 130 interposed therebetween.
Here, the small-diameter portion 131 of the rotating shaft 101 is provided with two needle bearings 130, 130 and four oil passages 145, 145... Opening between the copper bushes 136 and the shims 137.

  An oil passage 146 is formed in the rotation shaft 101 from the oil supply passage 123 in the rotation shaft toward a position along the rear side surface of the ball bearing 110 of the rotation shaft 101. An oil seal 147 is mounted between the rotary shaft 101 and the opening of the bottom wall 109a of the supercharger casing 109. The oil seal 147 prevents the lubricating oil from flowing into the supercharger casing 109 and ball bearings. The lubricating oil is supplied from the oil passage 146 to 110.

A communication passage 149 is formed in the bottom wall 109a of the supercharger casing 109, and a lubricating oil return passage 148 that opens toward the outer rotor 94 of the generator 92 in the generator chamber 99 is formed in the joint housing chamber 102. The communication path 149 and the lubricant return path 148 are connected in communication, and the communication path 149 is connected to the oil path 146.
Therefore, the downstream side which is the rear end side of the connecting pipe external oil supply passage 142 communicates with the lubricant return passage 148 via the oil passage 146 and the communication passage 149. The connecting portion between the joint housing chamber 102 and the bottom wall 109a of the turbocharger casing 109, which is a connecting portion between the communication passage 149 and the lubricating oil return passage 148, is aligned with the communication passage 149 and the lubricating oil return passage 148. A connecting member 152 is provided on the surface.

  On the other hand, the communication hole 143 of the connection pipe 140 is opened at the position where the needle bearing 111 is arranged at the rear end of the rotation shaft 101, and from the oil supply passage 123 in the rotation shaft of the rotation shaft 101 corresponding to the position of the communication hole 143. An oil passage 150 that is open on the outer peripheral surface of the rotating shaft 101 is formed. An oil seal 151 that prevents the inflow of lubricating oil into the supercharger casing 109 is attached to the crankshaft 20 side adjacent to the needle bearing 111.

  According to the first embodiment, the movable scroll 116 is inserted into the boss portion 122 together with the shim 137, the copper bush 136, and the needle bearings 130, 130 in the insertion direction side of the movable scroll 116. 101 can be inserted.

  Here, in this state, the needle bearings 130, 130 are restricted from moving in the insertion direction side of the movable scroll 116 by the stepped portion d, and the boss portion 122 is placed on the stepped portion between the large inner diameter portion 133 and the small inner diameter portion 132. The movement of the movable scroll 116 in the insertion direction is restricted by locking.

  If the copper bush 136, shim 137, and circlip 138 are mounted on the side opposite to the insertion direction of the movable scroll 116 (rear part, right side in FIG. 4), the needle bearings 130 and 130 are moved by the circlip 138. This is because the movement of the movable scroll 116 to the side opposite to the insertion direction is restricted by the step portion between the large inner diameter portion 133 and the small inner diameter portion 132 on the opposite side to the insertion direction to the rotating shaft 101. Then, the oil seal 139 opposite to the insertion direction of the movable scroll 116 is attached to the seal attachment portion 134 of the boss portion 122.

The rotary shaft 101 is disposed coaxially with the crankshaft 20 of the internal combustion engine E, is driven by the crankshaft 20 via the joint 103, and is connected to the rear crankcase 37 of the crankcase 31. Therefore, the crankshaft 20 and the rotary shaft 101 can be connected to each other by the joint 103 while being easy to assemble the movable scroll 116, and the internal combustion engine including the supercharger 45 that is a compressor. E can be configured compactly.
Furthermore, the oil supply passage 123 in the rotation shaft is formed in the eccentric shaft portion 126 of the rotation shaft 101, and the oil passage 145 facing the inner peripheral surface of the shim 137 is formed in the eccentric shaft portion 126, so that the shim 137 and the eccentric shaft are formed. The friction of the portion 126 can be reduced, and the operability of the movable scroll 116 can be improved.
A small inner diameter portion 132 is formed on the inner side of the boss portion 122 of the movable scroll 216 at a position corresponding to the position where the needle bearing 130 is disposed, and a large inner diameter portion 133 is further formed on both sides of the small inner diameter portion 132. A seal mounting portion 134 having a diameter larger than that of the large inner diameter portion 133 is formed in the opening at the front and rear ends of the portion 122 corresponding to the large diameter portion 135 of the eccentric shaft portion 126, so that the needle bearing 130 and the shim 137 are formed. The positioning of the oil seal 139 can be facilitated.

Next, a second embodiment of the present invention will be described with reference to FIG.
This embodiment differs in the component structure between the eccentric shaft part 126 and the boss | hub part 122 of the rotating shaft 101 of 1st Embodiment. A large-diameter portion 135 to which a pair of needle bearings 130 and 130 are attached is arranged on the eccentric shaft portion 126 provided on the rotary shaft 101 from the insertion direction side (front portion, left side in FIG. 6) of the movable scroll 116 to be opposite to the insertion direction. A small-diameter portion 131 is formed on the large-diameter portion 135 via a step portion d on the side opposite to the insertion direction of the movable scroll 116 (rear portion, right side in FIG. 6).

  A small inner diameter portion 132 is formed inside the boss portion 122 of the movable scroll 116 at a position corresponding to the arrangement position of the needle bearing 130, and the small diameter portion 131 is formed on the opposite side of the small inner diameter portion 132 in the insertion direction of the movable scroll 116. Correspondingly, a large inner diameter portion 133 is formed. A seal mounting portion 134 having a diameter larger than that of the large inner diameter portion 133 is formed on the insertion direction side of the movable scroll 116 of the small inner diameter portion 132 and on the opposite side of the insertion direction of the movable scroll 116 of the large inner diameter portion 133. .

  An oil seal 139 is mounted on the large-diameter portion 135 of the eccentric shaft portion 126 of the rotary shaft 101 between the needle bearings 130 and 130 and the seal mounting portion 134 of the movable scroll 116 in the insertion direction. On the side opposite to the insertion direction of the movable scroll 116, a small-diameter portion 131 is attached to a shim 170 for positioning the eccentric shaft portion 126 of the movable scroll 116, and a large-diameter portion 133 of the boss portion 122 is mounted on the rear side of the shim 170. The outer circlip 180 and the inner circlip 181 to be mounted on the small diameter portion 131 of the boss portion 122 are mounted. The shim 170 has substantially the same outer diameter as the large inner diameter portion 133 of the boss portion 122 of the movable scroll 116, a side surface of which is in contact with the stepped portion d, and a smaller diameter than the flange portion 171. It is formed with a ring portion 172 that protrudes in the opposite direction to the insertion direction.

The position of the flange portion 171 of the shim 170 is restricted to the crankshaft 20 side by the step portion d, and the position opposite to the crankshaft 20 is restricted by the outer circlip 180 and the inner circlip 181, and the eccentric shaft of the rotating shaft 101. It is supported by the small diameter part 131 of the part 126.
An oil seal 139 is attached to the seal attachment portion 134 on the opposite side of the insertion direction of the movable scroll 116 between the small diameter portion 131 of the eccentric shaft portion 126.

  Therefore, according to the second embodiment, in the state where the front fixed scroll 115F of the supercharger casing 109 of the supercharger 45 is fixed to the rear crankcase 37, the movable scroll 116 is the boss portion 122 of the movable scroll 116. The oil seal 139 and the needle bearings 130 and 130 are assembled in advance in the seal mounting portion 134 on the insertion direction side.

Therefore, the movable scroll 116 can be inserted into the rotary shaft 101 in a state where the oil seal 139 on the insertion direction side of the movable scroll 116 is assembled to the boss portion 122 together with the needle bearings 130 and 130 in advance.
If the shim 170, the outer circlip 180, and the inner circlip 181 are attached to the side opposite to the insertion direction of the movable scroll 116, the needle bearings 130 and 130 are moved to the movable scroll 116 by the outer circlip 180 and the inner circlip 181. The movement is restricted by a shim 170 that is prevented from coming off on the side opposite to the insertion direction. Further, the movement of the boss portion 122, that is, the movable scroll 116, to the side opposite to the insertion direction of the rotating shaft 101 is restricted by the step portion between the large inner diameter portion 133 and the small inner diameter portion 132. In this state, the oil seal 139 opposite to the insertion direction of the movable scroll 116 is attached to the seal attachment portion 134 of the boss portion 122.

  In particular, in the second embodiment, when the shim 170 is replaced during maintenance, it is not necessary to remove the boss portion 122 of the movable scroll 116 from the rotating shaft 101, and the oil seal 139 opposite to the insertion direction of the movable scroll 116 is provided. Since the shim 170 can be removed simply by removing it, workability can be improved.

  The present invention is not limited to the above-described embodiment. For example, the present invention can be applied not only to a four-wheel saddle-ride type vehicle but also to a two-wheel vehicle and a three-wheel saddle-ride type vehicle. It can also be applied to. Moreover, although the structure provided with the front and rear fixed scrolls 115F and 115R is taken as an example, it can be applied to a supercharger having a structure having a single fixed scroll.

20 Crankshaft 31 Crankcase 45 Supercharger (scroll compressor)
101 Rotating shaft 103 Joint 109 Supercharger casing (casing)
115F front fixed scroll 115R rear fixed scroll 116 movable scroll 120 spiral blade 121 spiral blade 122 boss portion 126 eccentric shaft portion 131 small diameter portion 130 needle bearing (scroll bearing)
135 Large-diameter portion 137, 170 Shim 139 Oil seal 171 Flange portion 172 Ring portion d Step portion E Internal combustion engine

Claims (5)

  A rotary shaft is rotatably supported with respect to a fixed scroll having spiral blades, and a boss portion of a movable scroll having spiral blades on an eccentric shaft portion provided on the rotary shaft is pivotally supported via a scroll bearing. A scroll type compressor in which a shim for axially positioning the movable scroll with respect to the eccentric shaft portion is provided, and an oil seal is provided between the boss portion of the movable scroll and the eccentric shaft portion of the rotary shaft. The eccentric shaft portion of the rotating shaft is composed of a large diameter portion on the insertion direction side of the movable scroll and a small diameter portion on the opposite side to the insertion direction of the movable scroll, and the oil on the insertion direction side of the movable scroll. The seal is supported by the large-diameter portion, the shim is supported by the small-diameter portion, and the position of the shim is determined by the step portion formed by the large-diameter portion and the small-diameter portion. Scroll compressor and performs control.   The scroll bearing is supported by the large-diameter portion, the shim is provided on the side opposite to the insertion direction of the movable scroll, and the shim has an outer peripheral diameter that is substantially the same as the inner peripheral diameter of the boss portion of the movable scroll. 2. The scroll type according to claim 1, comprising: a flange portion that abuts on the stepped portion; and a ring portion that is smaller in diameter than the flange portion and protrudes on the opposite side to the insertion direction of the movable scroll. Compressor.   The rotary shaft is disposed coaxially with a crankshaft of an internal combustion engine, and includes a casing that is driven by the crankshaft through a joint and is coupled to the crankcase. 2. The scroll compressor according to 2.   The oil supply passage is formed in the eccentric shaft portion of the rotating shaft, and the oil passage facing the inner peripheral surface of the shim is formed in the eccentric shaft portion. Scroll compressor.   A small inner diameter portion is formed on the inner side of the boss portion of the movable scroll at a position corresponding to the position of the scroll bearing, large inner diameter portions are formed on both sides of the small inner diameter portion, and the opening portions at the front and rear ends of the boss portion are formed. The scroll compressor according to any one of claims 1 to 4, wherein a seal mounting portion having a diameter larger than that of the large inner diameter portion is formed corresponding to the large diameter portion of the eccentric shaft portion.

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