JP2006214378A - Fluid pressure feed mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim at enabling a fluid to be pressure-fed up to a given height by utilizing an existing rotary shaft without preparing an extra pump in a mechanism for pressure-feeding the fluid. <P>SOLUTION: A rotor 21 is fixed to an end portion of the rotary shaft 5 such as a speed varying shaft 5 or the like immersed in the fluid within a case. A casing is arranged which circles round a peripheral surface in a radial direction of the rotor 21 and an end face in its axial direction. A discharge opening is formed in an inner circumferential surface of the casing circling around the peripheral surface of the rotor 21 and besides a suction opening is formed in an end face of the casing circling around the end face of the rotor 21. Then, one fluid chamber 33 is formed in the rotor 21. The fluid chamber 33 includes a discharge opening-side opening 35 communicating periodically with the discharge opening by rotation of the rotor 21, a suction opening-side opening 36 communicating constantly with the suction opening, and a sputtering surface 38 for sputtering the fluid within the fluid chamber 33 via the discharge-side opening 35 by the rotation of the rotor 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid pumping mechanism, and is mainly suitable for supplying lubricating oil without interruption to a lubricating portion such as a transmission gear fitting portion on a transmission shaft in a gear type transmission incorporating a plurality of transmission shafts. The present invention relates to a liquid pumping mechanism.

  For example, in a gear-type transmission equipped in a vehicle engine, a method of supplying lubricating oil to a gear-gear fitting portion or the like generally stores a certain amount of lubricating oil at the bottom of the transmission case, and shifts gears. The lubricating oil is scraped up by a rotating shaft and a transmission gear disposed at the lower part of the machine case, the lubricating oil is splashed by the scraping action, and is supplied to each lubricating portion. However, with this scraping method, the amount of oil supplied to the other transmission shafts arranged at the upper part is smaller than that of the transmission shafts arranged at the lower part of the transmission case, especially when operating at a low speed. Since the amount of scraping decreases and the momentum of scraping decreases, the amount of oil supplied to the upper transmission shaft is further reduced.

In contrast to the scraping method, there is a forced lubrication method using an oil pump as a method for improving the lubrication performance. As another method, for example, as shown in FIG. 25, a transmission shaft (rotating shaft) 102 in the transmission case. The guide tube 104 is fitted into the shaft hole 103, a spiral oil guide groove 106 is formed on the inner peripheral surface of the guide tube 104, and the guide tube 104 is rotated integrally with the speed change shaft 102, so that the oil There is also a method of guiding the lubricating oil into the shaft hole 103 by the action of the guide groove 106 (Patent Document 1).
JP 2001-336617 A

  The forced lubrication method using the oil pump has problems such as a complicated structure due to an attachment mechanism such as a filter and construction of an oil line, an increase in cost of parts, and an increase in weight. For example, when a trochoid pump is used as an oil pump, the outer rotor and the inner rotor that meshes with the outer rotor from the inside must be arranged eccentrically, which complicates the structure and requires time for assembly, resulting in parts costs. Also gets higher. Further, for example, when a centrifugal oil pump having an impeller 201 having a large number of blades 200 as shown in FIG. 26 is adopted, the cost increases, and one room between the blades 200 is used. Is communicating with the discharge port 203, a part of the lubricating oil leaks from the room to the next room, and in particular, the amount of leakage increases during low-speed operation, and the pump efficiency decreases.

  As shown in FIG. 25, the structure in which the guide tube 104 having the spiral oil guide groove 106 is fitted into the shaft hole 103 without using the oil pump can achieve cost reduction, but there is a space limitation. Since it is large, the acting force (pressing force) by the oil guide groove 106 with respect to the lubricating oil is small, and it is difficult to exert a pump function having a certain lift. For example, although it is possible to exert an acting force (pressing force) that can maintain the flow of the lubricating oil so as not to flow backward, it is possible to feed oil from the bottom of the transmission case to the transmission shaft at a certain height above. It is difficult.

[Object of invention]
The object of the present invention is to provide a liquid pumping mechanism that can supply liquid to an upper position with a lift similar to that of an oil pump or the like with a simple structure at low cost without specially equipped with a liquid pump such as an oil pump. It is to be.

  In order to solve the above-mentioned problem, the liquid pumping mechanism according to the first aspect of the present invention fixes the rotor to the shaft end of the rotating shaft immersed in the liquid in the case, and the outer circumferential surface of the rotor in the radial direction. And a casing that surrounds the end surface in the axial direction (axial direction or axial length direction) is disposed, and a discharge port is formed on the inner peripheral surface of the casing surrounding the outer peripheral surface of the rotor, and suction is performed on the casing end surface surrounding the end surface of the rotor Forming a mouth, forming one liquid chamber in the rotor, the liquid chamber having a discharge side opening periodically communicating with the discharge port by rotation of the rotor, and a suction side opening constantly communicating with the suction port; And a repelling surface for repelling the liquid in the liquid chamber to the discharge port through the discharge side opening by the rotation of the rotor.

  The liquid pumping mechanism according to the second aspect of the invention fixes the rotor to the shaft end portion of the rotating shaft immersed in the liquid in the case, and surrounds the radial outer peripheral surface and the axial end surface of the rotor. A casing is disposed, a scraping port is formed on the inner peripheral surface of the casing surrounding the outer peripheral surface of the rotor, a discharge port is formed in the rotating shaft, and one liquid chamber is formed in the rotor. A discharge-side opening that is always in communication with the discharge port in the rotating shaft, a scraping-side opening that is periodically communicated with the scratching port by the rotation of the rotor, and a liquid that is introduced into the liquid chamber by the rotation of the rotor. It has a scraping surface.

  According to a third aspect of the present invention, the liquid pumping mechanism fixes the rotor to the shaft end portion of the rotating shaft immersed in the liquid in the case, and surrounds the radial outer peripheral surface and the axial end surface of the rotor. A casing is disposed, a scraping port and a discharge port are formed at intervals in the rotation direction on the inner peripheral surface of the casing surrounding the outer peripheral surface of the rotor, and one liquid chamber is formed in the rotor. A discharge-side opening that periodically communicates with a discharge port by rotation of the rotor, a repellent surface that repels liquid in the liquid chamber to the discharge port through the discharge-side opening by rotation of the rotor, and There is a scraping side opening that communicates with the scratching port in synchronization with the communication timing of the discharge side opening, and a scraping surface that scrapes the liquid into the liquid chamber by the rotation of the rotor.

(1) According to the first aspect of the present invention, the rotor includes a rotor fixed to the shaft end of the rotating shaft immersed in the liquid, and a casing surrounding the rotor, and the rotor forms one liquid chamber, A liquid pumping mechanism is formed by forming a discharge side opening periodically opened by the rotation of the rotor in the liquid chamber, and forming a splashing surface for discharging the liquid in the liquid chamber. Compared to a structure including a pump, it is not necessary to provide an additional mechanism, and a pump function having a certain head can be exhibited while being a low-cost and simple structure.

(2) According to the invention described in claim 2, a rotor fixed to the shaft end of the rotating shaft immersed in the liquid and a casing surrounding the rotor are formed, and one liquid chamber is formed in the rotor, The liquid pumping mechanism is configured by forming a scratching side opening periodically opened by the rotation of the rotor in the liquid chamber and forming a scraping surface for scraping the liquid into the liquid chamber. Similar to the first aspect of the invention, it is not necessary to provide an attachment mechanism as compared with a structure including a general liquid pump, and a pump function having a certain head can be exhibited while being a simple structure at a low cost. In addition, since the liquid is taken into the casing by the scraping method, it is possible to scrape the liquid into the casing even if the amount of liquid stored in the case is reduced, and to maintain the pump mechanism. it can.

(3) The invention described in claim 3 includes a rotor fixed to the shaft end portion of the rotating shaft immersed in the liquid and a casing surrounding the rotor, and forms one liquid chamber in the rotor. Since the scratch side opening and the discharge side opening which are periodically and synchronously opened by the rotation of the rotor are formed in the chamber, the scraping surface and the splashing surface are formed. Compared to a structure having a general liquid pump, it is not necessary to provide an attachment mechanism, and a pump function having a certain head can be exhibited while being a simple structure at a low cost. In addition, the liquid is taken into the casing by the scraping method, and the liquid in the casing is splashed out by the splashing surface, so even if the amount of liquid stored in the case decreases, the liquid is scraped. Due to the synergistic effect of the action and the repelling action, a pump function having a high head can be exhibited.

(4) In any of the claims, since only one rotor is fixed to the shaft end portion of the rotating shaft as a rotating body, the number of parts can be reduced and assembly is easy. Moreover, an increase in weight can be suppressed.

[Embodiment of repelling method]
(Outline of gear type transmission)
FIGS. 1 to 9 show an example in which the splashing type liquid pressure feeding mechanism according to the present invention is used as a lubricating hydraulic pressure feeding mechanism of a vehicle gear transmission. FIG. 1 is a schematic vertical cross-sectional view of a transmission case 1 for a vehicle, but only a minimum part necessary for the present invention is shown in a simplified manner. Several transmission shafts and transmission gears which are not actually shown are shown. Groups and shift mechanisms are provided. In FIG. 1, a certain level L1 of lubricating oil S is stored at the bottom of the transmission case 1, and a lower transmission shaft (rotary shaft) 5 is provided at a lower position where the lubricating oil S is immersed. The lower transmission shaft 5 is rotatably supported on the end wall of the transmission case 1 by a pair of bearings 6 at both ends in the axial direction (axial direction or axial length direction). While the vehicle is driving, it always rotates. Of the pair of bearings 6, at least a bearing (a bearing on the left side in the drawing) 6 on the side where a lubricating hydraulic pressure feeding mechanism 20 described later is disposed is a bearing with a seal.

  In the upper part of the transmission case 1, an upper transmission shaft 7 is located at an upper position separated from the lower transmission shaft 5 by a certain distance (height) H and not immersed in the lubricating oil S. The upper transmission shaft 7 is rotatably supported at the end walls of the transmission case 1 via a pair of bearings 8 at both ends in the axial direction, and a plurality of transmission gears 10, 11. Are rotatably fitted via needle bearings 12 and 13. As for the pair of upper bearings 8, as with the lower bearing 6, at least the bearing 8 on the side where the lubricating hydraulic pressure feeding mechanism 20 is disposed is a sealed bearing.

  The gear-type transmission in the transmission case 1 receives power from an output shaft of an engine (not shown) via a power transmission mechanism such as a belt converter, and shifts (decelerates) at a desired gear ratio, and then outputs (not shown). Power is transmitted to the wheels via a shaft and a power transmission mechanism.

(Lubrication mechanism)
A lubricating oil supply passage 15 extending in the axial direction is formed in the shaft portion of the upper transmission shaft 7, and one end (left end in FIG. 1) of the lubricating oil supply passage 15 in the axial direction is opened. The other end (the right end in FIG. 1) is closed, and in the middle of the axial direction, there are lubricating oil supply holes 16 and 17 extending outward in the radial direction and communicating with the fitting portions of the needle bearings 12 and 13, respectively. Each is formed.

  A lubricating hydraulic pressure feeding mechanism (liquid pressure feeding mechanism) 20 that pumps lubricating oil to the upper transmission shaft 7 is provided at one end portion (left end portion in FIG. 1) of the lower transmission shaft 5 in the axial direction. .

(Lubricated hydraulic feed mechanism)
The lubrication hydraulic pressure feeding mechanism 20 includes a rotor 21 fixed to one end portion of the lower transmission shaft 5 and a casing 22 surrounding the rotor 21. The casing 22 includes a first casing member 22 a having a cylindrical inner peripheral surface 23 surrounding the radial outer peripheral surface of the rotor 21, and a second casing member 22 b having an end surface 24 surrounding the axial end surface of the rotor 21. A discharge port 25 that opens to the outer peripheral surface of the rotor 21 is formed at the upper end of the first casing member 22a, and the discharge port 25 is formed in one end wall of the transmission case 1. It communicates with the open end of the lubricating oil supply passage 15 of the upper transmission shaft 7 via the formed oil passage 27. The second casing member 22 b is formed with a suction port 26 that opens in the axial direction with respect to the shaft core portion of the rotor 21, and the lower end of the suction port 26 is in the lubricating oil S at the bottom of the transmission case 1. It is open.

  The rotor 21 integrally has a small-diameter shaft portion 21a, and the shaft portion 21a is press-fitted and fixed to a rotor mounting recess 30 formed at the shaft end portion of the lower transmission shaft 5. A constant radial gap C1 (for example, a gap of 0.1 to 0.2 mm) is secured between the radial outer peripheral surface of the rotor 21 and the inner peripheral surface 23 of the first casing member 22a. A certain axial gap C2 (for example, a 0.1 to 0.2 mm gap) is also formed between the end face in the axial direction of the rotor 21 and the end face 24 of the second casing member 22b. The gap C2 can be adjusted by adjusting shims or the like.

  FIG. 2 is an exploded perspective view of the lower transmission shaft 5 and the rotor 21. The rotor 21 is fixed to the same axis as the axis O 1 of the transmission shaft 5, and one liquid chamber 33 is formed in the rotor 21. ing. The liquid chamber 33 is open at one end (left end) in the axial direction and closed at the other end (right end) on the transmission shaft 5 side by a partition wall 34, and has a partially cylindrical suction space 33 a in the axial portion. And has a fan-like shape extending outward from the suction space 33a in the radial direction. The radially outer end of the liquid chamber 33 opens radially outward as a discharge side opening 35, and one end (left end) in the axial direction of the suction space 33 a opens in the axial direction as a suction side opening 36. The suction-side opening 36 is always in communication with the suction port 26 of the casing 22 as shown in FIG.

  3 is a cross-sectional view taken along the line III-III in FIG. 1, and the rear end surface 38 in the rotation direction R of the liquid chamber 33 is a repelling surface for repelling the lubricating oil in the liquid chamber 33 upward. The repelling surface 38 extends in a planar shape in the radial direction from the rear end edge in the rotation direction R of the discharge side opening 35 to the suction space portion 33a. The front end surface 39 in the rotation direction R of the liquid chamber 33 extends in a curved shape from the front end edge in the rotation direction R of the discharge side opening 35 to the suction space portion 33a.

  The discharge side opening 35 periodically communicates with the discharge port 25 by the rotation of the rotor 21. In this embodiment, the discharge side opening 35 opens and closes every half rotation of the rotor 21. . That is, the opening range θ1 in the rotation direction R of the discharge side opening 35 is set to 90 °, and the opening range θ2 in the rotation direction R of the discharge port 25 of the casing 22 is also set to 90 ° correspondingly. While the rotor 21 makes one revolution, the discharge side opening 35 opens with respect to the discharge port 25, a 180 ° rotation section from the communication start position shown in FIG. 3 to the communication end position shown in FIG. The remaining 180 ° section is closed by the casing inner peripheral surface 23.

(Action and effect)
(1) During engine operation, the rotor 21 of FIG. 1 rotates integrally with the lower transmission shaft 5 that rotates constantly. In the rotation range from the communication end position in FIG. 9 to the communication start position in FIG. 3, the discharge-side opening 35 is closed by the inner peripheral surface 23 of the casing 22, so that the lubricating oil is not discharged to the discharge port 25.

(2) The discharge side opening 35 starts to communicate with the discharge port 25 from the communication start position of FIG. 3, and the communication area gradually increases as shown in FIGS. 4 and 5, and the discharge side opening 35 of the discharge side opening 35 as shown in FIG. When the entire surface is in communication with the discharge port 25 and further rotates, the communication area gradually decreases as shown in FIGS. 7 and 8, and the entire surface of the discharge side opening 35 returns to the closed state as shown in FIG. . In the rotation range from the communication start position in FIG. 3 to the communication end position in FIG. 9, the splashing surface 38 is rotating (moving) upward, so that the lubricating oil in the liquid chamber 33 is subjected to centrifugal force and splashing. Due to the pressing action of the delivery surface 38, it is repelled (pressure-fed) through the discharge-side opening 35 to the upper discharge port 25 and supplied to the lubricating oil supply passage 15 of the upper transmission shaft 7 through the oil passage 27 of FIG. Is done. And it supplies to the fitting part of each needle bearing 12 and 13 from each lubricating oil supply hole 16 and 17, and lubricates this fitting part. Moreover, although not shown, it is also possible to supply to the lubrication location of the shift mechanism.

  According to the present embodiment, the lubrication hydraulic pressure feeding mechanism 20 is configured by the rotor 21 fixed to the shaft end portion of the transmission shaft 5 immersed in the lubricating oil S and the casing 22 surrounding the rotor 21. One liquid chamber 33 is formed, and the discharge side opening 35 that is periodically opened by the rotation of the rotor 21 and the splashing surface 38 are formed in the liquid chamber 33. Compared to a structure including a pump, it is not necessary to provide an additional mechanism, and a pump function having a certain head H can be exhibited while being a low-cost and simple structure. Further, since only one rotor 21 is fixed to the shaft end portion of the transmission shaft 5 as a rotating body, the number of components can be reduced and the assembly is easy, and the increase in weight can be suppressed. it can.

(Modification of rotor)
FIG. 10 shows a modification of the rotor 21 of the splashing-out type lubrication hydraulic pressure feeding mechanism 20, in which the splashing surface 38 of the liquid chamber 33 is formed in an arc shape protruding forward in the rotation direction R.

[Another embodiment of the splashing method]
FIG. 11 shows another embodiment of the lubrication hydraulic pressure feeding mechanism 20 of the splashing type. In addition to the structure of the embodiment of FIGS. 1 to 9, the lubricating oil supply passage 15 of the upper transmission shaft 7 A screw body 40 having a spiral groove is provided as an auxiliary transfer mechanism. The screw body 40 is press-fitted into one end portion of the lubricating oil supply passage 15 of the upper transmission shaft 7 and rotates integrally with the transmission shaft 7. Lubricating oil is quickly fed into the lubricating oil supply passage 15. The depth of the spiral groove of the screw body 40 is formed larger than the diameter of the shaft portion 40a of the screw body 40, thereby ensuring a large transfer capacity.

  The embodiment of FIG. 11 has the same structure as that of the embodiment of FIGS. 1 to 9 except for the structure having the screw body 40, and the same components are denoted by the same reference numerals.

[Embodiment of scraping method]
12 to 17 show an example in which the scraping-type liquid pressure feeding mechanism according to the present invention is used as the lubricating hydraulic pressure feeding mechanism 20 of the vehicle gear transmission. Compared with the splashing-out method of FIGS. 1-9, the structure of the lubricating hydraulic feed mechanism 20 and the lubricating oil path from the lubricating hydraulic feed mechanism 20 to the lubricating oil supply passage 15 of the upper transmission shaft 7 are different. Other configurations are substantially the same, and parts having the same names are denoted by the same reference numerals, and detailed description of common structures is omitted.

  FIG. 12 is a schematic vertical cross-sectional view of the transmission case 1. As a lubricating oil path, the shaft portion of the lower transmission shaft 5 communicates with the rotor mounting recess 30 and the other end (right end) in the shaft direction. ) Is formed, and the other end wall of the transmission case 1 is formed from the lubricating oil supply passage 42 of the lower transmission shaft 5 to the lubricating oil supply passage 15 of the upper transmission shaft 7. A path 43 is formed. The pair of bearings 6 that support the lower transmission shaft 5 are both sealed bearings, and the pair of bearings 8 that support the upper transmission shaft 7 is the side on which at least the oil passage 43 is disposed. The (right side) bearing 8 is a bearing with a seal.

  The lubrication hydraulic pressure feeding mechanism 20 includes a rotor 21 fixed to one end portion of the lower transmission shaft 5 and a casing 22 surrounding the rotor 21, and the casing 22 surrounds a radially outer peripheral surface of the rotor 21. A first housing member 22 a having a peripheral surface 23 and a second casing member 22 b having an end surface 24 surrounding an end surface in the axial direction of the rotor 21 are provided.

  The rotor 21 integrally has a shaft portion 21a that is press-fitted and fixed to the rotor mounting recess 30 of the transmission shaft 5. A discharge passage 47 that penetrates in the axial direction is formed in the shaft core portion of the shaft portion 21a. The discharge passage 47 is always in communication with the left end discharge port 44 of the lubricating oil supply passage 42 through the discharge end opening 53 at the right end.

  A scraping port 46 is formed at the lower end portion of the first casing member 22 a, and the scraping port 46 opens into the lubricating oil S at the bottom of the transmission case 1.

  FIG. 13 is an exploded perspective view of the lower transmission shaft 5 and the rotor 21. The rotor 21 is fixed to the same shaft core as the shaft core O 1 of the transmission shaft 5, and the rotor 21 has one spiral shape. A liquid chamber 50 is formed. One end (left end) in the axial direction of the liquid chamber 50 is opened, the other end (right end) is closed by a partition wall 51, and the radially outer end is opened radially outward as a scraping side opening 52. is doing. The shaft core portion (center portion) of the liquid chamber 50 communicates with the discharge passage 47 of the shaft portion 21a.

  14 is a cross-sectional view taken along the line XIV-XIV in FIG. 12, and the inner surface of the liquid chamber 50 has a scraping surface 54 that spreads in a spiral shape from the axial center to the front in the rotational direction R and outward in the radial direction. A front end surface 55 that extends in a curved shape radially inward from the front end edge in the rotational direction R of the scraping side opening 52, and an arc shape from the radially inward end of the front end surface 55 to the rear in the rotational direction R An extended backflow prevention surface 56 is provided.

  The scraping side opening 52 periodically communicates with the scraping port 46 by the rotation of the rotor 21. In the present embodiment, the scraping side opening 52 opens and closes approximately every half rotation of the rotor 21. It has become. That is, the opening range θ3 in the rotational direction R of the scraping side opening 52 is set to approximately 90 °, and the opening range θ4 in the rotational direction R of the scraping port 46 of the casing 22 is set to about 80 to 90 °. As a result, while the rotor 21 makes one rotation, the scraping side opening 52 has a scraping port 46 in a rotation section of about 170 ° to 180 ° from the communication start position shown in FIG. 14 to the communication end position shown in FIG. The other section is closed by the casing inner peripheral surface 23.

(Action and effect)
(1) During engine operation, the rotor 21 in FIG. 12 rotates integrally with the lower transmission shaft 5. In the rotation range from the communication end position in FIG. 17 to the communication start position in FIG. 14, the scraping side opening 52 is blocked by the inner peripheral surface 23 of the casing 22, so that the lubricating oil S is not scraped.

(2) The scratching side opening 52 starts to communicate with the scratching port 46 from the communication start position of FIG. 14, and the communication area gradually increases, and almost the entire surface of the scratching side opening 52 is scratched as shown in FIG. 16, the communication area gradually decreases as shown in FIG. 16, and the entire surface of the scraping side opening 52 is closed as shown in FIG. 14 to 17, the lubricating oil in the scraping port 46 and the liquid chamber 50 is scraped into the axial core side of the liquid chamber 50 by the scraping surface 54, and the discharge passage 47, FIG. It is pumped into the lubricating oil supply passage 42 of the lower transmission shaft 5 through the discharge side opening 53 and the discharge port 44.

  Then, the oil is supplied from the lubricating oil supply passage 42 through the oil passage 43 to the lubricating oil supply passage 15 of the upper transmission shaft 7, and the fitting portions of the needle bearings 12 and 13 are fitted from the lubricating oil supply holes 16 and 17. To lubricate the mating portion.

  The lubrication hydraulic pressure feeding mechanism according to the present embodiment includes a rotor 21 fixed to the shaft end portion of the transmission shaft 5 immersed in the lubricating oil, and a casing 22 surrounding the rotor 21. A liquid chamber 50 is formed, and a scraping side opening 52 that is periodically opened by the rotation of the rotor 21 is formed in the liquid chamber 50, and a scraping surface 54 that scrapes the lubricating oil into the liquid chamber is formed. Therefore, it is not necessary to provide an attachment mechanism as compared with a conventional structure including an oil pump, and a pump function having a fixed head H can be exhibited while being a simple structure at a low cost. Further, since the lubricating oil is taken into the casing 22 by the scraping method, even if the amount of the lubricating oil stored in the transmission case 1 is reduced, the lubricating oil is scraped into the casing 22 to discharge the opening 53. The pump mechanism with a sufficient lift H can be maintained even in a low-speed rotation state.

[Embodiment of scratching / repelling method]
FIGS. 18 to 23 show an example in which the scratching / repelling type liquid pressure feeding mechanism according to the present invention is used as the lubricating hydraulic pressure feeding mechanism 20 of the gear transmission for a vehicle. Compared with the splash-out method of FIGS. 1 to 9, the structure of the lubricating hydraulic pressure feeding mechanism 20 is different, but the other configurations are the same, and parts having the same names are denoted by the same reference numerals and detailed description is omitted. To do.

  In FIG. 18, which shows a schematic longitudinal sectional view of the transmission case 1, a lubricating hydraulic pressure feeding mechanism 20 is provided at one end of the lower transmission shaft 5, and the lubricating hydraulic pressure feeding mechanism 20 is connected to the lower transmission shaft 5. A rotor 21 fixed to one end portion and a casing 22 surrounding the rotor 21 are provided. The casing 22 includes a first casing member 22a having an inner peripheral surface 23 surrounding the outer peripheral surface in the radial direction of the rotor 21, and a second casing member 22b having an end surface 24 surrounding an end surface in the axial direction. A discharge port 25 and a scraping port 60 are formed at the upper end portion and the lower end portion of the first casing member 22a, and the discharge port 25 communicates with the lubricating oil supply passage 15 of the upper transmission shaft 7 via the oil passage 27. The scraping port 60 opens into the lubricating oil S at the bottom of the transmission case 1.

  FIG. 19 is an exploded perspective view of the lower transmission shaft 5 and the rotor 21. The rotor 21 is fixed to the same axis O 1 as the lower transmission shaft 5. One liquid chamber 61 is formed in the rotor 21, and the liquid chamber 61 is generally formed in a fan-shaped discharge side chamber portion 61 a and a predetermined interval in the rotation direction R from the discharge side chamber portion 61 a. A fan-shaped suction side chamber portion 61b is provided, and the chamber portions 61a and 61b communicate with each other at the shaft core portion. The entire liquid chamber 61 is open at one end (left end) in the axial direction and closed at the other end by a partition wall 65.

  FIG. 20 is a cross-sectional view taken along the line XX-XX in FIG. 18, and the radially outer end of the discharge side chamber portion 61a opens radially outward as a discharge side opening 62, and in the rotation direction R of the discharge side chamber portion 61a. The rear end surface 63 is a splashing surface for splashing the lubricating oil in the discharge side chamber portion 61 a to the outside, and the splashing surface 63 extends from the rear end edge of the discharge side opening 62 in the rotation direction R. It extends in a planar shape in the radial direction up to the core portion. The front end surface 64 in the rotation direction R of the discharge side chamber portion 61a extends in a curved shape from the front end edge in the rotation direction R of the discharge side opening 62 to the shaft core portion.

  The radially outer end of the scraping side chamber portion 61 b opens as a scraping side opening 66 facing outward in the radial direction. The rear end surface 67 in the rotation direction of the scraping side chamber portion 61b is a scraping surface for scraping the lubricating oil, and the scraping surface 67 is a rear end edge of the scraping side opening 66 in the rotation direction R. Inward and extends backward in the rotational direction R in a curved shape.

  The relative positional relationship between the discharge side opening 62, the scraping side opening 66, the discharge port 25 and the scraping port 60, and the opening range in the rotation direction R are determined as follows. 66 starts to communicate with the discharge port 25 and the scraping port 60 at the same time, is fully opened at the same time, and is further closed at the same time.

  A specific example of the positional relationship and opening range of the openings 62 and 66 will be described. In FIG. 21, the opening range θ1 in the rotation direction R of the discharge side opening 62 is the opening range θ2 in the rotation direction R of the discharge port 25. The opening range θ3 in the rotation direction R of the scraping side opening 66 is set to the same size as the opening range θ4 in the rotation direction R of the scraping port 60, and the rotation direction R of the discharge side opening 62 is set to the same size. The range θ5 from the rear end edge to the front end edge in the rotational direction R of the scraping side opening 66 is the range θ6 from the rear end edge in the rotational direction R of the discharge port 25 to the front end edge in the rotational direction R of the scraping port 60. Is set to the same size. Further, in the present embodiment, the ranges θ1, θ2, the ranges θ3, θ4, and the ranges θ5, θ6 are all set to the same size of 60 °.

(Action and effect)
(1) During engine operation, the rotor 21 in FIG. 18 rotates integrally with the lower transmission shaft 5. In the rotation range from the communication end position in FIG. 23 to the communication start position in FIG. 20, at least the scraping side opening 66 is closed by the inner peripheral surface 23 of the casing 22, so that the lubricating oil is scraped into the liquid chamber 61. I can't go wrong.

(2) From the communication start position of FIG. 20, the scraping side opening 66 begins to communicate with the scraping port 60, and at the same time, the discharge side opening 62 begins to communicate with the discharge port 25, and each communication area gradually increases. As shown in FIG. 23, the entire area of the discharge side opening 62 and the scraping side opening 66 communicates with the discharge port 25 and the scraping port 60, respectively, and the communication area gradually decreases as shown in FIG. Then, the entire surface of the discharge side opening 62 and the scraping side opening 63 returns to the closed state. In the rotation range from the communication start position of FIG. 20 to the communication end position of FIG. Due to the force and the pressing action of the repelling surface 63, it is repelled (discharged) from the repelling chamber portion 61a through the discharge side opening 62 to the discharge port 25, and in FIG. Are further supplied to the fitting portions of the needle bearings 12 and 13 from the respective lubricating oil supply oil holes 16 and 17 to lubricate the fitting portions.

  The lubrication hydraulic pressure feeding mechanism according to the present embodiment includes a rotor 21 fixed to the shaft end portion of the transmission shaft 5 immersed in the lubricating oil, and a casing 22 surrounding the rotor 21. A liquid chamber 61 is formed, and a scraping side opening 66 and a discharge side opening 62 that are periodically and synchronously opened by the rotation of the rotor 21 are formed in the liquid chamber 61, and the scraping surface 67 and the splashing surface are formed. 63, as in the first aspect of the present invention, it is not necessary to provide an attachment mechanism as compared with the conventional structure including an oil pump, and a low-cost and simple structure is constant. The pump function having the head H can be exhibited. Further, since the lubricating oil S is taken into the casing 22 by the scraping method and the lubricating oil in the casing 22 is splashed by the splashing method, the amount of lubricating oil stored in the transmission case 1 is increased. Even if the amount is reduced, the pump function having a high head can be exhibited by the synergistic effect of the scraping action and the repelling action.

  Further, since only one rotor 21 is fixed to the shaft end portion of the transmission shaft 5 as a rotating body, the number of parts can be reduced and assembly is easy, and an increase in weight can be suppressed. .

[Other embodiments]
(1) Each of the above embodiments is an example used as a lubrication hydraulic pressure feeding mechanism used for lubrication of a vehicle gear transmission, but is used for pressure feeding of cooling oil or lubricating oil in a power transmission system of a machine tool. In addition, it can be used as a liquid pumping mechanism in various power transmission systems.

(2) FIG. 24 shows an example of a gear transmission for a four-wheel drive vehicle to which the present invention can be applied. In the transmission case 1, the first transmission shaft 81 on the input side is arranged in order from the top. And the intermediate second transmission shaft 82 and the output-side third transmission shaft 83 are arranged in substantially the same vertical plane, behind the lowermost output-side third transmission shaft 83, An output shaft 84 is disposed. For example, rear wheels are mounted on both ends of the output shaft 84, and a front wheel power take-out shaft extending forward is linked to one end of the third transmission shaft 83 in the axial direction via a bevel gear mechanism. . In the transmission case 1, a lubricating oil S of a level L 1 that can immerse the third transmission shaft 83 is stored.

  In such a gear-type transmission, the lubricating hydraulic pressure feeding mechanism 20 according to the present invention is provided at the shaft end portion of the third transmission shaft 83, and the lubricating oil supply passage 15 is provided at the second transmission shaft 82. The lubricating oil feeding mechanism 20 supplies the lubricating oil S at the bottom of the transmission case 1 to the lubricating oil supply passage 15 of the second transmission shaft 82 via the oil passage 27, and the needle bearing 12 such as the transmission gear 10. Lubricate.

FIG. 2 is a schematic vertical sectional view of a vehicle transmission case, which is an example in which a splashing-type liquid pumping mechanism according to the present invention is used as a lubricating hydraulic pressure feeding mechanism of a vehicle gear transmission. FIG. 2 is an exploded perspective view of a transmission shaft and a rotor in FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 showing a state of a rotor communication start position. FIG. 4 is a cross-sectional view similar to FIG. 3 illustrating a state in the middle of expansion of the communication range of the rotor. FIG. 4 is a cross-sectional view similar to FIG. 3 illustrating a state in the middle of expansion of the communication range of the rotor. It is the same sectional drawing as FIG. 3 which shows the fully open state of a rotor. FIG. 4 is a cross-sectional view similar to FIG. 3 illustrating a state in which the communication range of the rotor is being reduced. FIG. 4 is a cross-sectional view similar to FIG. 3 illustrating a state in which the communication range of the rotor is being reduced. FIG. 4 is a cross-sectional view similar to FIG. 3 showing a state of the fully closed position of the rotor. It is the same sectional view as Drawing 3 showing the modification of a rotor. FIG. 5 is a schematic vertical cross-sectional view of a transmission case for a vehicle, which is another embodiment of a splashing-type liquid pumping mechanism. 1 is an example in which a scraping-type liquid pumping mechanism according to the present invention is used as a lubricating hydraulic pressure feeding mechanism of a vehicle gear transmission, and is a schematic vertical sectional view of a vehicle transmission case. FIG. 13 is an exploded perspective view of the transmission shaft and the rotor of FIG. 12. FIG. 13 is a cross-sectional view taken along the line XIV-XIV in FIG. 12 illustrating a state of a rotor communication start position. It is the same sectional drawing as FIG. 14 which shows the fully open state of a rotor. It is the same sectional drawing as FIG. 14 which shows the state in the middle of the reduction | decrease of the communication range of a rotor. It is the same sectional drawing as FIG. 14 which shows the state of the fully closed position of a rotor. FIG. 2 is a schematic vertical cross-sectional view of a vehicle transmission case, which is an example in which a scraping / repelling liquid pumping mechanism according to the present invention is used as a lubrication hydraulic pressure feeding mechanism of a vehicle gear transmission. FIG. 19 is an exploded perspective view of the transmission shaft and rotor of FIG. 18. It is XX-XX sectional drawing of FIG. 18 which shows the state of the communication start position of a rotor. It is the same sectional drawing as FIG. 20 which shows the fully open state of a rotor. It is the same sectional drawing as FIG. 20 which shows the state in the middle of the reduction | decrease of the communication range of a rotor. It is the same sectional drawing as FIG. 20 which shows the state of the fully closed position of a rotor. 1 is a schematic vertical sectional view of a gear transmission for a four-wheel drive traveling vehicle to which a liquid pumping mechanism according to the present invention can be applied. It is a fragmentary sectional view of a prior art example. It is a section schematic diagram showing an example of the conventional oil pump.

Explanation of symbols

1 Transmission case 5 Transmission shaft (an example of a rotating shaft)
10, 11 Speed change gear 12, 13 Needle bearing 15 Lubricating oil supply passage 16, 17 Lubricating oil hole 20 Lubricating hydraulic pressure feeding mechanism (an example of a liquid pressure feeding mechanism)
21 Rotor 22 Casing 23 Inner peripheral surface 24 End surface 25 Discharge port 26 Suction port 33 Liquid chamber 35 Discharge side opening 36 Suction side opening 38 Repelling surface 42 Lubricating oil supply passage 44 Discharge port 46 Scratch port 50 Liquid chamber 52 Scratch side Opening 53 Ejection side opening 54 Scratch surface 60 Scratch port 61 Liquid chamber 62 Ejection side opening 63 Repelling surface 66 Scratch side opening 67 Scratch surface

Claims (3)

The rotor is fixed to the shaft end portion of the rotating shaft immersed in the liquid in the case, and a casing surrounding the outer peripheral surface in the radial direction and the end surface in the axial direction of the rotor is disposed,
Forming a discharge port on the inner peripheral surface of the casing surrounding the outer peripheral surface of the rotor, and forming a suction port on the end surface of the casing surrounding the end surface of the rotor;
Forming one liquid chamber in the rotor;
The liquid chamber includes a discharge-side opening periodically communicating with the discharge port by rotation of the rotor, a suction-side opening constantly communicating with the suction port, and a liquid in the liquid chamber from the discharge-side opening by rotation of the rotor. A liquid pumping mechanism having a repelling surface that repels to the discharge port. The rotor is fixed to the shaft end portion of the rotating shaft immersed in the liquid in the case, and a casing surrounding the outer peripheral surface in the radial direction and the end surface in the axial direction of the rotor is disposed,
Forming a scraping port in the inner peripheral surface of the casing surrounding the outer peripheral surface of the rotor, forming a discharge port in the rotating shaft;
Forming one liquid chamber in the rotor;
The liquid chamber includes a discharge-side opening that is in constant communication with the discharge port in the rotating shaft, a scraping-side opening that periodically communicates with the scratching port by rotation of the rotor, and a liquid chamber that is rotated by rotation of the rotor. A liquid pumping mechanism having a scraping surface for scraping liquid into the interior. The rotor is fixed to the shaft end portion of the rotating shaft immersed in the liquid in the case, and a casing surrounding the outer peripheral surface in the radial direction and the end surface in the axial direction of the rotor is disposed,
On the inner peripheral surface of the casing surrounding the outer peripheral surface of the rotor, a scraping port and a discharge port are formed at intervals in the rotation direction,
Forming one liquid chamber in the rotor;
The liquid chamber includes a discharge-side opening that periodically communicates with the discharge port by rotation of the rotor, and a splashing surface that repels liquid in the liquid chamber to the discharge port through the discharge-side opening by rotation of the rotor. And a scraping side opening that communicates with the scraping port in synchronization with the communication timing of the discharge side opening, and a scraping surface that scrapes the liquid into the liquid chamber by the rotation of the rotor. A liquid pumping mechanism.

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