JP2015004299A - Oil volume adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil volume adjustment device which can locally adjust, according to the temperature, the volume of oil supplied to a slide part interposed between a crank shaft and a bearing.SOLUTION: An oil volume adjustment device 1 is provided in a crank shaft main passage 810. The oil volume adjustment device 1 includes a housing 2, a valve 4 having a movable shaft 41, a partition wall 32 having a partition wall side hole 320, an introduction chamber 22, a pressure chamber 23, an internal passage 400 interposed between the introduction chamber 22 and the pressure chamber 23, a second outflow passage B defined between the partition wall side hole 320 and the movable shaft 41, and a foreign-matter-inflow prohibiting part 77 covering an upstream end of the second outflow passage B and provided on an outer peripheral surface of the movable shaft 41.

Description

  The present invention relates to an oil amount adjusting device that adjusts the flow rate of oil supplied to a sliding portion interposed between a crankshaft and a bearing.

  Patent Document 1 discloses an oil supply device for an engine including a pressure regulator. The pressure regulating device is disposed in the main oil gallery. When the coolant temperature is equal to or lower than the predetermined coolant temperature, the pressure regulator controls the oil pressure to a low pressure set value. On the other hand, when the coolant temperature is higher than the predetermined water temperature, the pressure regulator controls the oil pressure to a high pressure set value. According to the oil supply device described in this document, the flow rate of oil supplied to the sliding portion interposed between the oil jet or the crankshaft and the bearing can be switched according to the coolant temperature.

JP 2012-2216 A

  However, according to the oil supply device described in the same document, the flow rate of oil supplied to the sliding portion interposed between the crankshaft and the bearing is independently controlled with respect to the flow rate of oil supplied to the oil jet. Can not do it.

  That is, in the case of the sliding portion interposed between the crankshaft and the bearing, it is desired to quickly reduce the frictional resistance. Here, in order to reduce the frictional resistance, the viscosity of the oil supplied to the sliding portion or the oil interposed in the sliding portion may be lowered. In order to reduce the viscosity of the oil, the temperature of the oil may be increased.

  For this reason, in the case of the sliding part interposed between the crankshaft and the bearing, in order to quickly reduce the frictional resistance, the cooling of the sliding part is intentionally limited immediately after the engine is started, A method of raising the value is conceivable. Here, in order to limit the cooling, the flow rate of oil supplied to the sliding portion may be reduced.

  However, in the case of the oil supply device of Patent Document 1, the oil flow rate is collectively adjusted by a relief valve. For this reason, the oil flow rate cannot be locally reduced only by the sliding portion interposed between the crankshaft and the bearing.

  Therefore, an object of the present invention is to provide an oil amount adjusting device capable of locally adjusting the flow rate of oil supplied to a sliding portion interposed between a crankshaft and a bearing according to temperature. To do.

  (1) In order to solve the above-described problem, an oil amount adjusting device of the present invention includes a crankshaft trunk passage disposed on the downstream side of an oil filter, a branch shaft connected to the crankshaft trunk passage, and a crankshaft. A crankshaft trunk passage of an oil path having a plurality of bearings mounted on the crankshaft and a plurality of crankshaft branch passages for supplying oil to a plurality of sliding portions interposed therebetween A valve having a cylindrical housing, a valve body disposed inside the housing and capable of reciprocating in the axial direction of the housing, and a movable shaft projecting from the valve body on the back side; A partition wall disposed on the back side of the valve body and having a partition wall side hole through which the movable shaft is inserted, and is partitioned on the front side of the valve body inside the housing, An introduction chamber into which the fluid is introduced; a pressure chamber defined between the valve body and the partition wall in the housing; an internal passage disposed between the introduction chamber and the pressure chamber; A first outlet passage that is disposed between the introduction chamber and the outside of the housing and through which the oil flows out from the introduction chamber, and is defined between an inner peripheral surface of the partition side hole and an outer peripheral surface of the movable shaft. A second outflow passage through which the oil flows out from the pressure chamber, and a foreign matter inflow suppressing portion disposed on the outer peripheral surface of the movable shaft so as to cover the upstream end of the second outflow passage, and immediately after starting the engine When the engine is not fully warmed up, the engine is warmed up to a closed state in which the oil is supplied to the plurality of sliding portions via a small flow path. In the warm state after completion, the small flow path has the small flow path and the first outflow passage. By switching to a valve-opened state in which the oil is supplied to the plurality of sliding parts through at least the large flow path among the large flow paths having a larger path cross-sectional area than the path, The flow rate of the oil supplied to the plurality of sliding portions is collectively adjusted during the warm time.

  Here, the “path cross-sectional area” of the small flow path and the large flow path refers to the minimum value of the cross-sectional area in the direction orthogonal to the extending direction of the path (small flow path, large flow path).

  The oil amount adjusting device of the present invention is disposed in the trunk passage for the crankshaft. The crankshaft trunk passage supplies oil to all the sliding portions interposed between the crankshaft and a plurality of bearings that are mounted on the crankshaft.

  When cold, the oil amount adjusting device can supply oil to all the sliding portions interposed between the crankshaft and the plurality of bearings via the small flow path. That is, when cold, the flow rate of oil supplied to all the sliding portions interposed between the crankshaft and the plurality of bearings can be reduced. For this reason, it is possible to suppress cooling of all the sliding portions interposed between the crankshaft and the plurality of bearings. Therefore, the temperature of the oil supplied to these sliding parts can be raised using the frictional heat. That is, the viscosity of the oil can be lowered. Therefore, the frictional resistance of these sliding parts can be reduced.

  On the other hand, the oil amount adjusting device cranks the oil through at least the large flow path among the small flow path and the large flow path during the warm time when the oil temperature is higher than that during the cold time. It can supply to all the sliding parts interposed between a shaft and a some bearing. That is, when warm, the flow rate of oil supplied to all the sliding portions interposed between the crankshaft and the plurality of bearings can be increased. For this reason, a sufficient amount of oil can be supplied to all the sliding portions interposed between the crankshaft and the plurality of bearings. Therefore, these sliding parts can be cooled. Moreover, the frictional resistance of these sliding parts can be reduced.

  As described above, according to the oil amount adjusting device of the present invention, the flow rate of the oil supplied to all the sliding portions interposed between the crankshaft and the plurality of bearings is locally and collectively changed to the temperature. Can be adjusted according to.

  In addition, for example, when cold, the flow rate of oil supplied to all sliding parts interposed between the crankshaft and the plurality of bearings is reduced compared to the case without an oil amount adjusting device. Can do.

  Further, for example, when cold, the flow rate of oil supplied to all the sliding portions interposed between the crankshaft and the plurality of bearings is compared with other sliding portions connected to the oil path. Can be small.

  Further, according to the oil amount adjusting device of the present invention, the internal passage is disposed upstream of the pressure chamber, and the second outflow passage is disposed downstream of the pressure chamber. The internal pressure of the pressure chamber changes according to the oil temperature. Therefore, the valve can be reciprocated between the valve open position (valve position in the valve open state) and the valve close position (valve position in the valve close state) using the change in the internal pressure. .

  Moreover, according to the oil amount adjusting device of the present invention, the second outflow passage is partitioned between the outer peripheral surface of the movable shaft of the valve and the inner peripheral surface of the partition wall side hole of the partition wall. That is, one of the members forming the second outflow passage is integrated with the valve. For this reason, compared with the case where a movable shaft and a valve | bulb are separate bodies, a number of parts may be small. Further, the length of the housing, that is, the oil amount adjusting device in the front and back direction (length in the axial direction) can be shortened. That is, the oil amount adjusting device can be reduced in size. For this reason, the mountability of the oil amount adjusting device is improved.

  Moreover, according to the oil amount adjusting device of the present invention, the foreign matter inflow suppressing portion is disposed on the outer peripheral surface of the movable shaft. In the valve-closed state and the valve-opened state, the foreign matter inflow suppressing portion is interposed between the internal passage and the second outflow passage. For this reason, it can suppress that the foreign material in oil (for example, sludge, abrasion powder, garbage, processing powder at the time of engine manufacture, etc.) flows into the 2nd outflow passage. Accordingly, it is possible to suppress the foreign matter from being clogged in the second outflow passage and increasing the internal pressure of the pressure chamber. That is, it is possible to prevent the load applied to the valve from the back side (pressure chamber side) from increasing and the oil amount adjusting device from becoming difficult to switch from the closed state to the open state.

  (2) Preferably, in the configuration of (1), the internal passage has an orifice, and the second outflow passage has a leak whose opening width is smaller than the orifice and whose total opening area is larger than the orifice. It is better to have a gap configuration. According to this configuration, the internal pressure of the pressure chamber can be easily adjusted according to the oil temperature.

  (3) Preferably, in the configuration of the above (1) or (2), further comprising a switching passage disposed in the valve body and having a passage cross-sectional area smaller than that of the first outflow passage, The valve main body closes the first outflow passage, and the switching passage is inserted between the introduction chamber and the first outflow passage, so that the introduction chamber, the switching passage, and the first outflow passage are The small flow rate path is formed, and at the time of the warm, the valve body opens the first outflow passage, the switching passage is extracted from between the introduction chamber and the first outflow passage, It is preferable that the large flow path having the introduction chamber and the first outflow passage is formed.

  Here, the “passage cross-sectional area” of the first outflow passage and the switching passage means the minimum value of the cross-sectional area in the direction orthogonal to the extending direction of the passage (first outflow passage, switching passage). According to this configuration, in the valve closed state, all the sliding interposed between the crankshaft and the plurality of bearings through the small flow path having the introduction chamber, the switching passage, and the first outflow passage. Parts can be supplied. That is, the oil flow rate can be reduced by passing through the switching passage.

  On the other hand, in the valve open state, the oil is passed through all the sliding portions interposed between the crankshaft and the plurality of bearings via the large flow path having the introduction chamber and the first outflow passage. Can be supplied. That is, the oil flow rate can be increased.

  The second outflow passage is originally provided for controlling the internal pressure of the pressure chamber. In other words, the second outflow passage is provided to control the operation of the valve. For this reason, the allowable range of the cross-sectional area of the second outflow passage is limited to some extent from the viewpoint of adjusting the internal pressure. Therefore, if the small flow path is set using the second outflow passage, the degree of freedom for setting the flow rate of oil flowing through the small flow path is reduced.

  In this regard, according to the present configuration, the small flow path is set without using the second outflow passage. In other words, the small flow path is set using the switching passage. For this reason, the freedom degree with respect to the flow volume setting of the oil which flows through a small flow path is high.

  (4) Preferably, in the configuration of the above (1) or (2), the second outflow passage is set to have a smaller cross-sectional area than the first outflow passage, and in the cold state The valve main body closes the first outflow passage, and the small flow path having the introduction chamber, the internal passage, the pressure chamber, and the second outflow passage is formed. It is better that the main body opens the first outflow passage and the large flow path having the introduction chamber and the first outflow passage is formed.

  Here, the “passage cross-sectional area” of the first outflow passage and the second outflow passage is the minimum value of the cross-sectional area in the direction orthogonal to the extending direction of the passage (first outflow passage, second outflow passage). Say. According to this configuration, in the valve-closed state, all of the oil is interposed between the crankshaft and the plurality of bearings via the small flow path having the introduction chamber, the internal passage, the pressure chamber, and the second outflow passage. Can be supplied to the sliding portion. That is, the flow rate of oil can be reduced by passing through the second outflow passage.

  On the other hand, in the valve open state, the oil is passed through all the sliding portions interposed between the crankshaft and the plurality of bearings via the large flow path having the introduction chamber and the first outflow passage. Can be supplied. That is, the oil flow rate can be increased.

  The second outflow passage is originally provided for controlling the internal pressure of the pressure chamber. In this regard, according to the present configuration, the small flow path is set using the second outflow passage. For this reason, compared with the case where a small flow path is set without using the second outflow passage, the structure of the oil amount adjusting device is simplified.

  ADVANTAGE OF THE INVENTION According to this invention, the oil quantity adjusting device which can adjust the flow volume of the oil supplied to the sliding part interposed between a crankshaft and a bearing locally according to temperature can be provided.

It is an arrangement plan of an oil amount adjustment device of a first embodiment. It is a perspective sectional view of the oil amount adjusting device. It is a disassembled perspective sectional view of the oil amount adjusting device. It is an up-down direction sectional view of the valve closing state of the oil amount adjusting device. It is an up-down direction sectional view of the valve opening state of the oil amount adjusting device. It is an enlarged view in the frame VI of FIG. It is an enlarged view in the frame VII of FIG. It is an up-down direction sectional view of the valve closing state of the oil amount adjustment device of a second embodiment. It is an up-down direction sectional view of the valve opening state of the oil amount adjusting device. (A) is an up-down direction sectional view near the foreign substance inflow suppression part of the oil amount adjusting device of the other embodiment (part 1). (B) is an up-down direction sectional view of the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (part 2). (C) is an up-down direction sectional view of the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (No. 3). (D) is an up-down direction sectional view of the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (No. 4). It is an up-down direction sectional view of the valve-opened state of the oil quantity adjusting device of other embodiments (the 5).

  Hereinafter, embodiments of the oil amount adjusting device of the present invention will be described.

<First embodiment>
[Arrangement of oil quantity adjusting device]
First, the arrangement of the oil amount adjusting device of the present embodiment will be described. In FIG. 1, the layout of the oil amount adjusting device of this embodiment is shown. As shown in FIG. 1, the engine 9 includes a cylinder block (not shown), a plurality of pistons 91, a plurality of connecting rods 92, a crankshaft 93, a plurality of piston cooling jets 94, and a plurality of main bearings 84. And a plurality of crank bearings 85. The main bearing 84 and the crank bearing 85 are each included in the concept of the “bearing” of the present invention.

  The crankshaft 93 includes a plurality of main journals 930, a plurality of crankpins 931, and a plurality of crank arms 932. The plurality of crank pins 931 are eccentrically connected to the plurality of main journals 930 via the plurality of crank arms 932.

  The main bearing 84 is rotatably mounted on the main journal 930. A main sliding portion S <b> 1 is set between the inner peripheral surface of the main bearing 84 and the outer peripheral surface of the main journal 930. The main sliding part S1 is included in the concept of the “sliding part” of the present invention. The main bearing 84 is attached between the support portion 900 of the cylinder block and the cap 901. In other words, the plurality of main bearings 84 rotatably support the crankshaft 93 with respect to the cylinder block.

  The crank bearing 85 is rotatably mounted on the crank pin 931. A pin sliding portion S2 is set between the inner peripheral surface of the crank bearing 85 and the outer peripheral surface of the crank pin 931. The pin sliding portion S2 is included in the concept of the “sliding portion” of the present invention.

  The connecting rod 92 is rotatably mounted on the crank pin 931 via a crank bearing 85. The piston 91 is attached to the connecting rod 92. The piston cooling jet 94 can inject oil O onto the back surface of the piston 91.

  The oil path 8 includes a discharge path 80, a crankshaft side path 81, and a camshaft side path (not shown). In the discharge passage 80, an oil pan 800, an oil pump 801, a relief valve 802, and an oil filter 803 are arranged. Oil O is stored in oil pan 800.

  The flow rate of the oil O discharged from the oil pump 801 is adjusted in an integrated manner by a relief valve 802. That is, when the valve opening pressure of the relief valve 802 is set low, the relief valve 802 is easily opened. For this reason, the flow rate of the oil O flowing from the oil pump 801 to the oil filter 803 side can be reduced. On the other hand, when the valve opening pressure of the relief valve 802 is set high, the relief valve 802 is difficult to open. For this reason, the flow rate of the oil O flowing from the oil pump 801 to the oil filter 803 side can be increased.

  The crankshaft side passage 81 includes a main oil hole 810, a plurality of crankshaft branch passages 811, a plurality of main bearing internal passages 812, a plurality of crankshaft internal passages 813, and a sub oil hole 819. Yes. The main oil hole 810 is included in the concept of the “crankshaft trunk passage” of the present invention.

  A main oil hole 810 and a sub oil hole 819 described later are branched and connected to the downstream side of the oil filter 803. The crankshaft branch passage 811 is formed inside the support portion 900. The crankshaft branch passage 811 is branched and connected to the main oil hole 810. The main bearing internal passage 812 is formed inside the main bearing 84. The main bearing internal passage 812 is connected to the crankshaft branch passage 811. The main bearing internal passage 812 is connected to the main sliding portion S1.

  The plurality of crankshaft internal passages 813 are formed inside the crankshaft 93. The crankshaft internal passage 813 connects the main sliding portion S1 and the pin sliding portion S2. The piston cooling jet 94 is branched and connected to the sub oil hole 819.

  Thus, on the downstream side of the oil filter 803 in the oil path 8, the oil O is supplied to the main oil hole 810 that supplies the oil O to the main sliding portion S 1 and the pin sliding portion S 2, and the piston cooling jet 94. A sub oil hole 819 is connected in parallel.

  The oil amount adjusting device 1 of the present embodiment is disposed in the main oil hole 810. In other words, the oil amount adjusting device 1 of the present embodiment is arranged on the upstream side of the plurality of crankshaft branch passages 811.

[Configuration of oil quantity adjusting device]
Next, the configuration of the oil amount adjusting device of the present embodiment will be described. In the following drawings, the upper side corresponds to the “front side” of the present invention. The lower side corresponds to the “back side” of the present invention. The vertical direction corresponds to the “axial direction of the housing” of the present invention.

  FIG. 2 shows a perspective cross-sectional view of the oil amount adjusting device of the present embodiment. FIG. 3 is an exploded perspective sectional view of the oil amount adjusting device. FIG. 4 shows a vertical sectional view of the oil amount adjusting device in a valve-closed state. FIG. 5 shows a vertical cross-sectional view of the valve opening state of the oil amount adjusting device. FIG. 6 shows an enlarged view in the frame VI of FIG. FIG. 7 shows an enlarged view in the frame VII of FIG. As shown in FIGS. 2 to 7, the oil amount adjusting device 1 includes a housing 2, a plug 3, a valve 4, a coil spring 70, and a foreign matter inflow suppressing portion 77.

(Housing 2)
The housing 2 is made of steel and is formed integrally with the chain cover 99 of the engine 9. The housing 2 has a T-shaped cylindrical shape. That is, the housing 2 includes a trunk pipe portion 2a and a branch pipe portion 2b.

  A trunk hole 20a is formed in the trunk tube portion 2a. The trunk hole 20a extends in the vertical direction. The trunk hole 20 a includes an inflow passage 200, step portions 201 and 202, an introduction chamber 22, and a pressure chamber 23. The inflow passage 200 is disposed near the upper end opening of the trunk hole 20a.

  The step portion 201 is disposed on the inner peripheral surface of the intermediate portion in the vertical direction of the trunk hole 20a. With the stepped portion 201 as a boundary, the inner diameter of the trunk hole 20a increases from the upper side to the lower side. The step portion 201 determines the top dead center (valve closing position) of the valve 4 described later. That is, in the valve closing state shown in FIG. 4, the step portion 201 is in contact with the valve body 40 from above. The step portion 202 is disposed in the vicinity of the lower end opening of the trunk hole 20a. With the stepped portion 202 as a boundary, the inner diameter of the trunk hole 20a increases from the upper side to the lower side.

  The introduction chamber 22 and the pressure chamber 23 are partitioned inside the trunk hole 20a. The introduction chamber 22 and the pressure chamber 23 are partitioned by a valve body 40 described later. That is, the introduction chamber 22 is disposed on the upper side of the valve body 40. On the other hand, the pressure chamber 23 is disposed below the valve body 40. In accordance with the movement of the valve 4, the volumes of the introduction chamber 22 and the pressure chamber 23 change.

  A branch hole 20b is formed in the branch pipe portion 2b. The branch hole 20b extends in the left-right direction. The left end of the branch hole 20b is connected to the middle part in the vertical direction of the trunk hole 20a (the lower part of the step part 201). The branch hole 20 b includes a first outflow passage 210.

  The main oil hole 810 passes through the inflow passage 200, the introduction chamber 22, and the first outflow passage 210. As shown in FIG. 1, an oil filter 803 is connected to the upstream side of the inflow passage 200 (the upper side in FIG. 4). On the other hand, on the downstream side (right side in FIG. 4) of the first outflow passage 210, a plurality of crankshaft branch passages 811, that is, a plurality of main sliding portions S1 and a plurality of pin sliding portions S2, are branched and connected. Yes.

(Valve 4, foreign matter inflow suppressing portion 77)
The valve 4 includes a valve main body 40 and a movable shaft 41. The valve body 40 is made of steel and has a cup shape that opens upward. The valve body 40 includes an internal passage 400, an annular groove 408, and a switching passage 409. The internal passage 400 penetrates the valve main body 40 in the vertical direction. The cross section of the internal passage 400 in the horizontal direction (the radial direction of the trunk hole 20a) has a perfect circle shape. As shown in FIG. 6, an orifice (throttle portion) A is disposed at the lower end portion of the internal passage 400. The orifice A is formed in the bottom wall of the valve body 40. The horizontal cross section of the orifice A has a perfect circle shape. The passage cross-sectional area (horizontal cross-sectional area) of the internal passage 400 is locally reduced at the orifice A. The switching passage 409 is formed in the side wall of the valve body 40. The cross section of the switching passage 409 in the vertical direction (axial direction of the trunk hole 20a) has a perfect circle shape. The passage sectional area (vertical sectional area) of the switching passage 409 is set smaller than the passage sectional area (vertical sectional area) of the first outflow passage 210. The annular groove 408 is recessed in the outer peripheral surface of the valve body 40 on the entire circumference. An opening on the radially outer end side of the switching passage 409 is formed in the groove bottom surface of the annular groove 408.

  The movable shaft 41 protrudes downward from the lower surface of the valve body 40. The movable shaft 41 is disposed at the radial center of the valve body 40. The movable shaft 41 has a long cylindrical shape extending in the vertical direction. The horizontal cross section of the movable shaft 41 has a perfect circle shape.

  The foreign matter inflow suppressing portion 77 has a conical shape that is pointed upward. The foreign matter inflow suppressing portion 77 is fixed to the outer peripheral surface of the movable shaft 41. In the valve-closed state shown in FIG. 4 and the valve-opened state shown in FIG. 5, the foreign substance inflow suppressing portion 77 covers a leak gap B described later from above. In other words, the foreign substance inflow suppressing portion 77 and the leak gap B overlap in the vertical direction. The foreign matter inflow suppressing portion 77 includes a tapered surface 770 that is pointed upward.

(Plug 3, coil spring 70)
The plug 3 is made of steel and includes a mounting portion 30, a cylindrical portion 31, and a partition wall 32. The attachment portion 30 has an annular shape. The attachment part 30 is attached to the step part 202 of the trunk hole 20a. The cylindrical portion 31 protrudes upward from the upper surface of the mounting portion 30.

  The partition wall 32 is disposed in the upper end opening of the cylindrical portion 31. The partition wall 32 has a disk shape. The partition wall 32 includes partition wall side holes 320 and a plurality of communication grooves 325. The partition wall side hole 320 is disposed at the radial center of the partition wall 32. The partition wall side hole 320 penetrates the partition wall 32 in the vertical direction. The horizontal cross section of the partition wall side hole 320 has a perfect circle shape. The plurality of communication grooves 325 are recessed in the upper surface of the partition wall 32. When viewed from the upper side, the plurality of communication grooves 325 are radially arranged with the partition wall side hole 320 as the center, separated by a predetermined angle.

  The upper surface of the partition wall 32 determines the bottom dead center (valve opening position) of the valve 4. That is, in the valve open state shown in FIG. 5, the upper surface of the partition wall 32 is in contact with the foreign matter inflow suppressing portion 77 from below. In the valve open state, the plurality of communication grooves 325 connect the radially outer side of the partition wall 32 and the partition wall side hole 320 in the radial direction.

  The movable shaft 41 of the valve 4 (portion below the foreign substance inflow suppressing portion 77) passes through the inner side in the radial direction of the partition wall side hole 320. The movable shaft 41 and the partition wall side hole 320 are arranged coaxially. As shown in FIG. 7, the leak gap B is defined between the outer peripheral surface of the movable shaft 41 and the inner peripheral surface of the partition wall side hole 320. The leak gap B has an annular shape. The radial width (opening width) of the leak gap B is set smaller than the diameter (opening width) of the orifice A. The horizontal passage cross-sectional area (total opening area) of the leak gap B is set larger than the horizontal passage cross-sectional area (total opening area) of the orifice A.

  The coil spring 70 (shown in a transparent manner in FIG. 2) is made of steel and is interposed between the lower surface of the valve body 40 of the valve 4 and the upper surface of the mounting portion 30 of the plug 3. Yes. The coil spring 70 urges the valve 4 upward (in the direction of switching from the valve open state to the valve close state).

[Movement of oil quantity adjustment device]
Next, the movement of the oil amount adjusting device of this embodiment will be described. As shown in FIGS. 4 and 5, a load Fu due to the pressure of the oil O in the main oil hole 810 is applied to the upper surface of the valve 4 from the upper side. On the other hand, a load Fd1 due to the urging force of the coil spring 70 is applied to the lower surface of the valve 4 from below. In addition, a load Fd2 due to the internal pressure of the pressure chamber 23 (pressure of the oil O) is applied to the lower surface of the valve 4 from below.

  Thus, the load Fu is applied to the valve 4 from the upper side and the loads Fd1 and Fd2 from the lower side. The valve 4 reciprocates in the vertical direction according to the magnitude relationship between these loads. The valve 4 is also subjected to a load due to its own weight, buoyancy, or the like depending on the mounting direction of the oil amount adjusting device 1, but is omitted here for convenience of explanation.

  The valve 4 reciprocates in the vertical direction according to the magnitude relationship between the loads Fu, Fd1, and Fd2. That is, the oil amount adjusting device 1 switches between a valve closing state shown in FIG. 4 and a valve opening state shown in FIG.

  It is the internal pressure of the pressure chamber 23 that determines the load Fd2. The internal pressure in the pressure chamber 23 varies depending on the relationship between the flow rate Q1 of the oil O flowing into the pressure chamber 23 and the flow rate Q2 of the oil O flowing out of the pressure chamber 23.

That is, the oil O flows into the pressure chamber 23 via the orifice A. Therefore, the density of the oil O is ρ, the pressure of the oil O in the introduction chamber 22 (that is, in the main oil hole 810) is Pa, the pressure of the oil O in the pressure chamber 23 is Pb, the flow coefficient is K1, and the orifice A Assuming that the cross-sectional area of the flow path is S, the flow rate of oil O passing through the orifice A, that is, the flow rate Q1 of oil O flowing into the pressure chamber 23 is derived from the following equation (1) by Bernoulli's theorem.

  From equation (1), it can be seen that the flow rate Q1 of the oil O flowing into the pressure chamber 23 is affected by the density ρ of the oil O. Here, the density ρ of the oil O does not change much even if the temperature of the oil O changes. For this reason, the density ρ of the oil O does not change much from the cold time to the warm time. Therefore, the flow rate Q1 of the oil O flowing into the pressure chamber 23 does not change so much from the cold time to the warm time.

On the other hand, the oil O flows out from the pressure chamber 23 via the leak gap B. Therefore, when the viscosity of the oil O is η, the coefficient is K2, and the atmospheric pressure is Pc, the flow rate of the oil O that passes through the leak gap B, that is, the flow rate of the oil O that flows out from the pressure chamber 23 according to Hagen-Poiseuille's law. Q2 is derived from the following equation (2).

  From the equation (2), it can be seen that the flow rate Q2 of the oil O flowing out from the pressure chamber 23 is affected by the viscosity η of the oil O. Here, the viscosity η of the oil O changes greatly as the temperature of the oil O changes. For this reason, the viscosity η of the oil O changes greatly when it reaches from the cold to the warm. Accordingly, the flow rate Q2 of the oil O flowing out from the pressure chamber 23 changes greatly when it reaches from the cold time to the warm time. Specifically, the viscosity η decreases as the temperature of the oil O increases. For this reason, the flow rate Q2 increases from the equation (2).

  As described above, the change in the flow rate Q2 with respect to the change in the temperature of the oil O is larger than the change in the flow rate Q1 with respect to the change in the temperature of the oil O. For this reason, the higher the temperature of the oil O, the easier the oil O leaks from the leak gap B. Therefore, the higher the temperature of the oil O, the smaller the internal pressure in the pressure chamber 23. Therefore, the higher the temperature of the oil O, the smaller the load Fd2.

  When the temperature of the oil O is cold, the load Fd2 is large. For this reason, when the oil amount adjusting device 1 is switched from the valve closing state shown in FIG. 4 to the valve opening state shown in FIG. 5, a large load Fu is required. That is, the valve opening pressure increases. Therefore, in the cold state, as shown in FIG. 4, the oil amount adjusting device 1 is likely to be in a valve-closed state.

  In the valve closing state, the valve 4 is stopped at a position (valve closing position) in contact with the step portion 201. For this reason, the valve body 40 is interposed between the introduction chamber 22 and the first outflow passage 210. The introduction chamber 22 and the first outflow passage 210 communicate with each other via the switching passage 409 and the annular groove 408 of the valve body 40.

  In the valve closed state, the oil O is supplied from the main oil hole 810 to the main sliding portion S1 via the small flow path L2 indicated by a thick line (solid line) in FIG. That is, the small flow rate path L2 includes the inflow passage 200, the introduction chamber 22, the internal passage 400, the switching passage 409, the annular groove 408, and the first outflow passage 210 from the upstream side toward the downstream side. The oil O in the main oil hole 810 is supplied to the plurality of main sliding portions S1 via the small flow path L2, the plurality of crankshaft branch passages 811, and the plurality of main bearing internal passages 812. The oil O supplied to the plurality of main sliding portions S1 (the plurality of main sliding portions S1 other than the central main sliding portion S1 at the center in the left-right direction) passes through the plurality of crankshaft internal passages 813 to It is supplied to the pin sliding part S2.

  On the other hand, when the temperature of the oil O is high, the load Fd2 is small. For this reason, when switching the oil quantity adjusting device 1 from the valve closing state shown in FIG. 4 to the valve opening state shown in FIG. 5, a small load Fu is sufficient. That is, the valve opening pressure is reduced. Therefore, during the warm period, as shown in FIG. 5, the oil amount adjusting device 1 is likely to be in a valve open state.

  In the valve open state, the valve 4 is stopped at a position (valve open position) in contact with the upper surface of the partition wall 32. For this reason, the valve body 40 is not interposed between the introduction chamber 22 and the first outflow passage 210.

  In the valve open state, the oil O is supplied from the main oil hole 810 to the main sliding portion S1 via the large flow path L1 shown by a bold line (solid line) in FIG. That is, the large flow rate path L1 includes the inflow passage 200, the introduction chamber 22, and the first outflow passage 210 from the upstream side toward the downstream side. The oil O in the main oil hole 810 is supplied to the plurality of main sliding portions S1 through the large flow path L1, the plurality of crankshaft branch passages 811, and the plurality of main bearing internal passages 812. The oil O supplied to the plurality of main sliding portions S1 (the plurality of main sliding portions S1 other than the central main sliding portion S1 at the center in the left-right direction) passes through the plurality of crankshaft internal passages 813 to It is supplied to the pin sliding part S2.

  Here, when the small flow path L2 shown in FIG. 4 is compared with the large flow path L1 shown in FIG. 5, the switching path 409 is interposed in the small flow path L2 rather than the large flow path L1. Therefore, the path cross-sectional area (the minimum value of the path cross-sectional area in the entire path length) is small. For this reason, the flow rate of the oil O is smaller in the small flow rate path L2 than in the large flow rate path L1. Therefore, the flow rate of the oil O supplied to the main sliding portion S1 is smaller in the valve closing state shown in FIG. 4 than in the valve opening state shown in FIG. That is, the flow rate of the oil O supplied to the main sliding portion S1 is smaller in the cold time than in the warm time. Similarly, the flow rate of the oil O supplied to the pin sliding portion S2 is smaller in the cold mode than in the warm mode.

  Note that, even in the valve-closed state shown in FIG. 4 and the valve-opened state shown in FIG. 5, the oil amount adjusting device 1 always has a leak path L3 indicated by a thick line (dotted line). That is, the leak path L3 includes an inflow passage 200, an introduction chamber 22, an internal passage 400 (orifice A), a pressure chamber 23, and a leak gap B from the upstream side toward the downstream side. The oil O in the main oil hole 810 is always discharged outside the housing 2 through the leak path L3.

  Further, in both the closed state shown in FIG. 4 and the opened state shown in FIG. 5, the leak gap B is always covered by the foreign matter inflow suppressing portion 77 from the upper side. In other words, the foreign substance inflow suppressing portion 77 is interposed between the orifice A and the leak gap B. Therefore, as shown in FIGS. 4 and 5, the foreign matter P in the oil that has passed through the orifice A moves along the surface 770 downward (in the direction in which gravity acts) and radially outward. The foreign matter P settles in the gap between the housing 2 and the plug 3. For this reason, the foreign matter P is unlikely to flow into the leak gap B.

[Function and effect]
Next, the effect of the oil amount adjusting device of this embodiment will be described. As shown in FIG. 1, the oil amount adjusting device 1 of the present embodiment is disposed in the main oil hole 810. As shown in FIG. 4, the oil amount adjusting device 1 passes the oil O to the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 via the small flow path L2 when cold. Can be supplied. That is, when cold, the flow rate of the oil O supplied to the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 can be reduced. For this reason, cooling of the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 can be suppressed. Therefore, the temperature of the oil O intervening in the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 can be increased using the frictional heat of the sliding portions. That is, the viscosity of the oil O can be lowered. Therefore, the frictional resistance of the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 can be reduced.

  On the other hand, as shown in FIG. 5, the oil amount adjusting device 1 supplies a plurality of oils O through a large flow rate path L1 when the temperature of the oil O is higher than when it is cold. The main sliding portion S1 and the plurality of pin sliding portions S2 can be supplied. In other words, during the warm period, the flow rate of the oil O supplied to the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 can be increased. For this reason, a sufficient amount of oil O can be supplied to the plurality of main sliding portions S1 and the plurality of pin sliding portions S2. Therefore, these sliding parts can be cooled. Moreover, the frictional resistance of these sliding parts can be reduced.

  Thus, according to the oil amount adjusting apparatus 1 of the present embodiment, the flow rate of the oil O supplied to the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 is locally and collectively, It can be adjusted according to the temperature.

  Further, when cold (the valve closed state shown in FIG. 4), the oil O supplied to the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 is compared with the case where the oil amount adjusting device 1 is not provided. The flow rate of can be reduced.

  Further, in the cold state (the valve closed state shown in FIG. 4), compared with other sliding portions connected to the oil path 8, the plurality of main sliding portions S1 and the plurality of pin sliding portions S2 are supplied. The flow rate of the oil O can be reduced.

  Further, according to the oil amount adjusting device 1 of the present embodiment, the internal pressure of the pressure chamber 23 changes according to the temperature of the oil O. Therefore, using the change in the internal pressure, between the valve opening position shown in FIG. 5 (valve position in the valve opening state) and the valve closing position shown in FIG. 4 (valve position in the valve closing state), The valve 4 can be reciprocated in the vertical direction.

  Further, according to the oil amount adjusting device 1 of the present embodiment, the switching passage 409 is disposed in the valve body 40. For this reason, the switching passage 409 can be inserted between the introduction chamber 22 and the first outflow passage 210 in conjunction with the reciprocation of the valve 4. In addition, the switching passage 409 can be extracted from between the introduction chamber 22 and the first outflow passage 210.

  The leak gap B is originally provided to control the internal pressure of the pressure chamber 23. In other words, the leak gap B is provided to control the operation of the valve 4. For this reason, the allowable range of the passage cross-sectional area of the leak gap B is limited to some extent from the viewpoint of adjusting the internal pressure. Therefore, if the small flow path L2 shown in FIG. 4 is set using the leak gap B, the degree of freedom for setting the flow rate of the oil O flowing through the small flow path L2 is reduced.

  In this regard, according to the oil amount adjusting apparatus 1 of the present embodiment, the small flow rate path L2 is set without using the leak gap B. In other words, the small flow path L2 is set using the switching passage 409. For this reason, the freedom degree with respect to the flow volume setting of the oil O which flows through the small flow path L2 is high.

  Further, according to the oil amount adjusting apparatus 1 of the present embodiment, as shown in FIGS. 4 and 5, the flow rate adjustment according to the temperature of the oil O is executed using the orifice A, the leak gap B, and the coil spring 70. be able to. For this reason, the structure of the oil amount adjusting device 1 is simple. In addition, the number of parts is small.

  Further, according to the oil amount adjusting device 1 of the present embodiment, a plurality of communication grooves 325 are disposed on the upper surface of the partition wall 32 as shown in FIG. For this reason, in the valve open state, the orifice A and the leak gap B can be reliably communicated. That is, the oil O for adjusting the internal pressure can be supplied to the pressure chamber 23 in the valve open state.

  Further, according to the oil amount adjusting apparatus 1 of the present embodiment, as shown in FIG. 5, the lower surface of the valve body 40 is seated on the upper surface of the partition wall 32 in the valve open state. For this reason, the maximum compression amount of the coil spring 70 can be regulated. Therefore, the coil spring 70 is difficult to sag.

  Further, the leak gap B of the oil amount adjusting device 1 of the present embodiment is partitioned between the outer peripheral surface of the movable shaft 41 and the inner peripheral surface of the partition wall side hole 320. That is, one of the members forming the leak gap B is integrated with the valve 4. For this reason, compared with the case where the movable shaft 41 and the valve | bulb 4 are separate bodies, a number of parts may be small. Further, the length of the housing 2 and the oil amount adjusting device 1 in the vertical direction can be shortened. That is, the oil amount adjusting device 1 can be reduced in size.

  The radial width (opening width) of the leak gap B is set smaller than the diameter (opening width) of the orifice A. For this reason, the foreign matter P that has passed through the orifice A may not be able to pass through the leak gap B. In this case, the leak gap B is clogged. When the leak gap B is clogged, the internal pressure of the pressure chamber 23 is increased. For this reason, the load Fd2 applied to the valve 4 from the back side (pressure chamber 23 side) is increased, and the oil amount adjusting device 1 is not easily switched from the valve closing state shown in FIG. 4 to the valve opening state shown in FIG.

  In this regard, according to the oil amount adjusting device of the present embodiment, the foreign substance inflow suppressing portion 77 is disposed on the outer peripheral surface of the movable shaft 41. In the valve-closed state shown in FIG. 4 and the valve-opened state shown in FIG. 5, the foreign substance inflow suppressing portion 77 is interposed between the internal passage 400 and the leak gap B. For this reason, the foreign matter P in the oil can be prevented from flowing into the leak gap B. Therefore, the oil amount adjusting device 1 is easily switched from the valve closing state shown in FIG. 4 to the valve opening state shown in FIG.

<Second embodiment>
The difference between the oil amount adjusting device of the present embodiment and the oil amount adjusting device of the first embodiment is that the small flow rate path is formed including a leak gap. That is, the leak path L3 shown in FIGS. 4 and 5 is used as a small flow path. Here, only differences will be described. FIG. 8 shows a vertical cross-sectional view of the oil amount adjusting device of the present embodiment in a valve-closed state. In addition, about the site | part corresponding to FIG. 4, it shows with the same code | symbol. FIG. 9 is a cross-sectional view in the vertical direction of the valve opening state of the oil amount adjusting device of the present embodiment. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol.

  As shown in FIGS. 8 and 9, the valve body 40 is not provided with a switching passage. For this reason, as shown in FIG. 8, in the valve-closed state, the communication between the introduction chamber 22 and the first outflow passage 210 is completely blocked. The lower end opening of the trunk hole 20a is connected to the upstream side of the plurality of crankshaft branch passages 811 shown in FIG.

  In the valve-closed state, oil is supplied from the main oil hole 810 to the main sliding portion via the small flow path L2 indicated by a thick line (solid line) in FIG. That is, the small flow path L2 includes an inflow passage 200, an introduction chamber 22, an internal passage 400 (orifice A), a pressure chamber 23, and a leak gap B from the upstream side toward the downstream side. The oil in the main oil hole 810 flows through the small flow passage L2, the plurality of crankshaft branch passages 811 and the plurality of main bearing internal passages 812 shown in FIG. It is supplied to the moving part S2.

  On the other hand, in the valve open state, oil is supplied from the main oil hole 810 to the main sliding portion via the large flow rate path L1 and the small flow rate path L2 shown in bold lines (solid lines) in FIG. That is, the large flow rate path L1 includes the inflow passage 200, the introduction chamber 22, and the first outflow passage 210 from the upstream side toward the downstream side. The oil in the main oil hole 810 flows through the large flow path L1, the plurality of crankshaft branch passages 811 and the plurality of main bearing internal passages 812 shown in FIG. It is supplied to the moving part S2. In addition, the oil in the main oil hole 810 flows through the small flow path L2, the plurality of crankshaft branch passages 811 and the plurality of main bearing internal passages 812 shown in FIG. It is supplied to the sliding part S2.

  In the closed state shown in FIG. 8, the flow rate of the oil O supplied to the main sliding portion S1 shown in FIG. 1 is the same as that in the open state shown in FIG. Becomes smaller. That is, the flow rate of the oil O supplied to the main sliding portion S1 is smaller in the cold time than in the warm time. Similarly, the flow rate of the oil O supplied to the pin sliding portion S2 is smaller in the cold mode than in the warm mode.

  The oil amount adjusting device according to the present embodiment and the oil amount adjusting device according to the first embodiment have the same functions and effects with respect to parts having the same configuration. According to the oil amount adjusting device 1 of the present embodiment, the small flow path L2 is set using the leak gap B. For this reason, compared with the case where the small flow path L2 is set without using the leak gap B, the structure of the oil amount adjusting device 1 is simplified.

<Others>
The embodiment of the oil amount adjusting device of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  FIG. 10A shows a vertical cross-sectional view of the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (part 1). FIG. 10B is a vertical sectional view of the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (part 2). FIG. 10C is a vertical sectional view in the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (part 3). FIG. 10D shows a vertical cross-sectional view in the vicinity of the foreign matter inflow suppressing portion of the oil amount adjusting device of the other embodiment (part 4). In these drawings, portions corresponding to those in FIG. 4 are denoted by the same reference numerals.

  As shown in FIG. 10 (a), a foreign substance inflow suppressing portion 77 having a shape in which conical cones in the upside down direction are connected may be arranged. As shown in FIG. 10B, a disc-shaped foreign matter inflow suppressing portion 77 may be arranged. As shown in FIG. 10C, a plurality of communication grooves 325 may be provided in the lower surface of the foreign substance inflow suppressing portion 77. As shown in FIG. 10D, a bottomed cylindrical (cup-shaped) foreign matter inflow suppressing portion 77 may be disposed. A plurality of communication grooves 325 may be provided in the lower edge of the foreign matter inflow suppressing portion 77. Thus, the shape of the foreign matter inflow suppressing portion 77 is not particularly limited. Further, the communication groove 325 may be disposed in the foreign matter inflow suppressing portion 77. In addition, a plurality of protrusions that contact the other may be disposed on at least one of the upper surface of the partition wall 32 and the lower surface of the foreign substance inflow suppressing portion 77. Then, the orifice A and the leak gap B may be communicated with each other in the valve open state by the protrusion.

  FIG. 11 is a cross-sectional view in the vertical direction of the valve opening state of the oil amount adjusting device of the other embodiment (No. 5). In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. As shown in FIG. 11, an endless annular support rib 73 may be disposed in the trunk hole 20a of the trunk tube portion 2a. The support rib 73 is disposed in the pressure chamber 23. The support rib 73 projects radially inward. When viewed from the upper side or the lower side, the support rib 73 is disposed so as to overlap the outer peripheral edge of the valve body 40. In addition, the support rib 73 is disposed on the coil spring 70 so as not to overlap when viewed from the upper side or the lower side. The support rib 73 determines the bottom dead center (opening position) of the valve 4. That is, in the valve open state, the support rib 73 supports the valve 4 from below. According to the oil amount adjusting device 1 of the present embodiment, it is not necessary to arrange a communication groove in the partition wall 32 or the foreign matter inflow suppressing portion 77. Further, instead of the endless annular support rib 73, a single or a plurality of protrusions protruding radially inward may be arranged. When disposing a plurality of protrusions, the protrusions may be disposed at equal angles along the inner peripheral surface of the trunk hole 20a. Further, the foreign substance inflow suppressing portion 77 and the movable shaft 41 may be integrally formed. The number of communication grooves 325 disposed is not particularly limited. Single or multiple.

  As shown in FIG. 4, in the above embodiment, the member (chain cover 99) other than the oil amount adjusting device 1 and the housing 2 are integrally formed. However, you may arrange | position the housing 2 independently from another member. That is, the cylindrical housing 2 may be inserted and fixed inside the main oil hole 810 in the radial direction.

  The cross-sectional shapes of the introduction chamber 22, the pressure chamber 23, the internal passage 400, the first outflow passage 210, the orifice A, and the communication groove 325 shown in FIGS. 4 and 5 in the direction orthogonal to the passage direction are not particularly limited. For example, it may be a perfect circle, an ellipse, or a polygon (such as a triangle, a quadrangle, a pentagon, or a hexagon).

  The cross-sectional shape in the direction orthogonal to the passage direction of the leak gap B shown in FIGS. 4 and 5 is not particularly limited. For example, it may be annular (perfectly circular, elliptical, polygonal, etc.), slit, perfect circle, elliptical, polygonal, etc.

  A plurality of leak gaps B may be arranged. In this case, the “opening width” of the present invention refers to the opening width of the single leak gap B. Further, the “total opening area” of the present invention refers to the sum of the opening areas of all the leak gaps B.

  Further, when the opening shapes of the orifice A and the leak gap B are long (for example, slit shape, annular shape, etc.), the “opening width” of the present invention refers to the width in the short direction of the orifice A and the leak gap B. .

  Further, when the opening shapes of the orifice A and the leak gap B are a perfect circle, an ellipse, or a polygon, the “opening width” in the present invention refers to a straight line length passing through the graphic center of gravity of the orifice A and the leak gap B. For example, when the orifice A and the leak gap B are circular, the “opening width” in the present invention refers to the length of the diameter.

  In the above embodiment, the orifice A is disposed in the internal passage 400 as shown in FIGS. However, the orifice A may not be disposed in the internal passage 400. In the said embodiment, as shown in FIG. 5, FIG. 11, the member (partition wall 32, support rib 73) which determines the bottom dead center of the valve | bulb 4 was arrange | positioned. However, the member for determining the bottom dead center of the valve 4 may not be arranged. That is, the bottom dead center of the valve 4 may be regulated by the internal pressure of the coil spring 70 and the pressure chamber 23.

1: Oil quantity adjusting device.
2: housing, 2a: trunk tube portion, 2b: branch tube portion, 20a: trunk hole, 20b: branch hole, 200: inflow passage, 201: step portion, 202: step portion, 210: first outflow passage, 22: Introduction chamber, 23: pressure chamber.
3: plug, 30: attachment part, 31: cylindrical part, 32: partition, 320: partition side hole, 325: communication groove.
4: valve, 40: valve body, 400: internal passage, 408: annular groove, 409: switching passage, 41: movable shaft.
70: Coil spring, 73: Support rib, 77: Foreign substance inflow suppression part, 770: Surface.
8: Oil passage, 80: Discharge passage, 800: Oil pan, 801: Oil pump, 802: Relief valve, 803: Oil filter, 81: Crankshaft side passage, 810: Main oil hole (crankshaft trunk passage), 811: Crankshaft branch passage, 812: Main bearing internal passage, 813: Crankshaft internal passage, 819: Sub oil hole, 84: Main bearing (bearing), 85: Crank bearing (bearing).
9: Engine, 900: Support, 901: Cap, 91: Piston, 92: Connecting rod, 93: Crankshaft, 930: Main journal, 931: Crankpin, 932: Crank arm, 94: Piston cooling jet, 99: Chain cover.
A: Orifice, B: Leakage gap, L1: Large flow path, L2: Small flow path, L3: Leak path, O: Oil, P: Foreign matter, S1: Main sliding part (sliding part), S2: Pin sliding Moving part (sliding part).

Claims (4)

A crankshaft trunk passage disposed downstream of the oil filter;
A plurality of crankshaft branch passages branchingly connected to the crankshaft trunk passage and supplying oil to a plurality of sliding portions interposed between the crankshaft and a plurality of bearings mounted around the crankshaft When,
Disposed in the trunk passage for the crankshaft of the oil path having
A tubular housing;
A valve that is disposed inside the housing and has a valve body that can reciprocate in the axial direction of the housing; and a movable shaft that projects from the valve body to the back side;
A partition wall disposed on the back side of the valve body and having a partition wall side hole through which the movable shaft is inserted; and
In the interior of the housing, an inlet chamber that is partitioned on the front side of the valve body and into which the oil is introduced,
A pressure chamber defined between the valve body and the partition wall in the housing;
An internal passage disposed between the introduction chamber and the pressure chamber;
A first outflow passage disposed between the introduction chamber and the outside of the housing, through which the oil flows out of the introduction chamber;
A second outflow passage partitioned between an inner peripheral surface of the partition wall side hole and an outer peripheral surface of the movable shaft, and from which the oil flows out of the pressure chamber;
A foreign matter inflow suppressing portion disposed on an outer peripheral surface of the movable shaft so as to cover an upstream end of the second outflow passage;
With
Immediately after starting the engine, when the engine is not warmed up, the valve is in a closed state in which the oil is supplied to the plurality of sliding portions via a small flow path.
At a warm time after completion of warming-up of the engine, at least the large flow path of the small flow path and the large flow path having the first outflow passage and having a larger cross-sectional area than the small flow path. Via the valve, the oil is supplied to a plurality of the sliding parts in a valve open state,
By switching
An oil amount adjusting device that collectively adjusts the flow rate of the oil supplied to the plurality of sliding portions during the cold time and during the warm time. The internal passage has an orifice;
2. The oil amount adjusting device according to claim 1, wherein the second outflow passage is a leak gap having an opening width smaller than the orifice and a total opening area larger than the orifice. Furthermore, the valve body is provided with a switching passage having a smaller passage cross-sectional area than the first outflow passage,
During the cold time, the valve body closes the first outflow passage, and the switching passage is inserted between the introduction chamber and the first outflow passage, so that the introduction chamber, the switching passage, The small flow path having a first outflow passage is formed;
During the warm period, the valve body opens the first outflow passage, the switching passage is withdrawn from between the introduction chamber and the first outflow passage, and the introduction chamber and the first outflow passage are opened. The oil amount adjusting device according to claim 1 or 2, wherein the large flow rate path is formed. The second outflow passage is set to have a smaller passage cross-sectional area than the first outflow passage,
In the cold state, the valve body closes the first outflow passage, and the small flow path having the introduction chamber, the internal passage, the pressure chamber, and the second outflow passage is formed,
3. The oil amount according to claim 1, wherein the valve main body opens the first outflow passage and the large flow passage having the introduction chamber and the first outflow passage is formed during the warm time. Adjustment device.

Images