JP2016070308A - Transmission for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an amount of foreign matters which flow in an oil suction flow passage toward an oil pump.SOLUTION: In a transmission 10 for a vehicle, an oil suction flow passage 23 in which an oil pump 19 sucks a lubricant in a gear case 11 is formed, and a sedimentation chamber 25 which enlarges a traverse area of the oil suction flow passage, and lowers a flow speed of the lubricant which flows in the oil suction flow passage is formed at the oil suction flow passage. The oil pump 19 is arranged at a clutch housing for sealing a front end of the gear case, the oil suction flow passage 23 has a first oil flow passage 24 formed at the gear case 11 and a second oil flow passage 31 formed at the clutch housing 20 so as to continue to the first oil flow passage 24, the sedimentation chamber 25 is formed at the first oil flow passage 24 at a front part of the gear case 11 which is sealed to the clutch housing 20, and the second oil flow passage 31 is formed so that the lubricant generates a convection flow in a remaining part of the sedimentation chamber 25 in which the second oil flow passage 31 is continuously deviated to the sedimentation chamber 25, and to which the second oil flow passage 31 is not continued.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular transmission in which an oil pump sucks lubricating oil in a gear case and supplies the lubricating oil to each lubrication-needed location.

  2. Description of the Related Art Conventionally, a vehicle transmission transmits rotation input from an input shaft coupled to an output shaft of a clutch to a counter shaft via a counter shaft drive gear that meshes with a high speed gear provided on the input shaft. It is known to transmit the engine torque to the drive wheels by changing the meshing of the respective gears provided on the shaft and the output shaft.

  Conventionally known as such a vehicle transmission is a forced lubrication system in which lubrication of each required portion of the transmission is forcibly performed by lubricating oil sent from an oil pump. In this lubrication structure, the oil in the gear case is sucked by an oil pump driven by a countershaft and guided to each lubrication required place. An oil suction passage is formed in which oil is guided to the oil pump and sucked.

  As shown in FIGS. 7 and 8, when the oil pump 9 is provided in the clutch housing 2, the oil suction passage 3 is formed so as to be continuous with both the gear case 1 and the clutch housing 2. The oil suction channel 3 is provided so that its cross-sectional shape is circular and its cross-sectional area does not change much.

  On the other hand, gears and friction materials that transmit the driving force from the engine are provided inside the transmission, so that there is no foreign matter in the lubricating oil that has been lubricated at the locations that require lubrication and returned to the inner bottom of the gear case. Sometimes mixed. For this reason, such a vehicle transmission is provided with a filter that filters out lubricating oil and removes foreign matters (see, for example, Patent Document 1). When the lubricating oil supplied from the oil pump is guided to the outside of the transmission and cooled by the oil cooler, a filter is also provided outside the transmission.

  Further, as shown in FIG. 8, when foreign matter is mixed into the lubricating oil that has lubricated each necessary portion and returned to the inner bottom portion of the gear case 1, the foreign matter flows through the oil suction flow path 3 to the oil pump. In order to prevent reaching 9, a filter 4 is also provided directly in the oil suction passage 3 through which the oil pump 9 sucks the lubricating oil accommodated in the gear case 1. A conventional filter 4 provided directly in the oil suction channel 3 is formed in a cylindrical shape and inserted into the oil suction channel 3 so as to filter the lubricating oil passing from the inside to the outside.

Japanese Utility Model Publication No. 6-54948

  However, in the filter 4 that is cylindrically inserted into the oil suction channel 3, the lubricating oil flowing through the oil suction channel 3 does not enter the inside but enters the outside from the beginning. As a result, the filter 4 does not filter the lubricating oil. As shown in FIG. 7, the oil suction flow path 3 has a cross-sectional area that does not change so much, so that the speed of the lubricating oil flowing through the oil suction flow path 3 does not decrease, and the filter 4 from the beginning. The foreign matter that has entered the outside flows to the oil pump 9 and causes a problem that such foreign matter cannot be removed.

  An object of the present invention is to provide a vehicle transmission that can reduce the amount of foreign matter flowing along with lubricating oil in an oil suction passage toward an oil pump.

  The present invention is an improvement of a vehicle transmission in which an oil suction passage through which an oil pump sucks lubricating oil inside a gear case is formed.

  The characteristic configuration is that a sedimentation chamber is formed in the oil suction flow path to enlarge the cross-sectional area of the oil suction flow path and reduce the flow rate of the lubricating oil flowing in the oil suction flow path.

  In this vehicle transmission, an oil pump is provided in the clutch housing that seals the front end of the gear case so that the oil suction passage is continuous with the first oil passage formed in the gear case and the first oil passage. A second oil flow path formed in the clutch housing, the settling chamber formed in the first oil flow path at the front of the gear case sealed in the clutch housing, and the second oil flow path biased to the settling chamber; It is preferable that the lubricating oil is formed so as to cause convection in the remaining portion of the settling chamber where the second oil passage is not continuous. In this case, the projecting piece that separates a part of the settling chamber in which the second oil passage is continuous with the clutch housing and the remaining portion of the settling chamber that causes convection in the lubricating oil without the second oil passage is continuous. More preferably, it is formed so as to protrude inside.

  Further, it is more preferable that a magnet for adsorbing metal foreign matter is detachably provided in the sedimentation chamber or the oil suction passage downstream of the sedimentation chamber.

  In the vehicle transmission according to the present invention, the sedimentation chamber for reducing the flow rate of the lubricating oil flowing through the oil suction passage is formed. And settles by its own weight. For this reason, the amount of foreign matter that flows downstream from the settling chamber and reaches the oil pump can be reduced.

  Further, if convection is generated in the lubricating oil in the settling chamber, foreign matters can be convected together with the lubricating oil convected in the settling chamber to promote the settling. Thereby, the quantity of the foreign material which flows downstream from the sedimentation chamber can be further reduced.

  If a magnet that adsorbs metallic foreign matter is provided in the settling chamber or the oil suction channel downstream of the settling chamber, the metallic foreign matter is adsorbed by the magnet and the amount of foreign matter reaching the oil pump is ensured. Can be reduced.

It is the perspective view which notched a part of transmission for vehicles of an embodiment of the present invention. It is a longitudinal cross-sectional view of the vehicle transmission. It is the perspective view which looked at the oil suction channel from the front end of the gear case. It is the perspective view which looked at the oil suction channel from the rear end of the clutch housing. It is a horizontal sectional view showing the flow of lubricating oil in the sedimentation chamber. It is the BB sectional drawing of FIG. 5 which shows the flow of the lubricating oil of the sedimentation chamber. It is a perspective view corresponding to FIG. 3 which shows the end surface of the gear case of the conventional transmission. It is a perspective view corresponding to FIG. 1 which shows the conventional transmission.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 2 shows a vehicle transmission 10 that is an object of the present invention. The transmission 10 is used for a truck that is a vehicle. In the transmission 10, a main shaft 12 extends in the front-rear direction on the upper side of the gear case 11. The main shaft 12 includes an input shaft 13 connected to a clutch (not shown) and an output shaft 14 provided coaxially behind the input shaft 13. On the other hand, a counter shaft 16 is disposed in parallel to the main shaft 12 in the gear case 11 below the main shaft 12.

  An output shaft (not shown) of the clutch is coupled to the input shaft 13, and a high speed gear 17 is provided on the input shaft 13. The counter shaft 16 is provided with a counter shaft drive gear 18 that meshes with a high speed gear 17 provided on the input shaft 13. The rotation of the input shaft 13 is transmitted to the counter shaft 16 via a high speed gear 17 and a counter shaft drive gear 18 provided on the input shaft 13, and the counter shaft 16 rotates from the input shaft 13 to the engine. Is directly transmitted and configured to rotate.

  A clutch housing 20 is provided in front of the gear case 11 so as to close the opening, and an oil pump 19 is provided in the clutch housing 20 at the front end portion of the counter shaft 16. The front end portions of the input shaft 13 and the counter shaft 16 are pivotally supported by the clutch housing 20, and the oil pump 19 is configured to be driven by the rotation of the counter shaft 16. And the oil pump 19 to drive is comprised so that the lubricating oil stored in the gear case 11 may be attracted | sucked and it supplies to a lubrication required location.

  As shown in FIG. 1, an oil suction passage 23 is formed in the gear case 11 and the clutch housing 20 for the oil pump 19 to suck the lubricating oil stored in the gear case 11. The oil suction passage 23 includes a first oil passage 24 formed in the gear case 11 and a second oil passage 31 formed in the clutch housing 20 so as to be continuous with the first oil passage 24. .

  A concave groove 11 a extending in the front-rear direction for storing lubricating oil is formed in the inner bottom portion of the gear case 11. The first oil passage 24 is formed by processing the gear case 11, and is formed at the rear end of the front / rear hole 25 and the front / rear hole 25 formed to extend in the front / rear direction of the gear case 11 so as to be parallel to the groove 11 a. The gear case 11 is formed to extend in the width direction, and includes a communication hole 26 that allows the rear end of the front / rear hole 25 to communicate with the groove 11a.

  The communication hole 26 has a circular cross section and extends in the width direction of the transmission 10. The communication hole 26 is formed so that one end communicates with the concave groove 11 a and the other end opens to the outside. A cylindrical filter 36 is inserted. The filter 36 is formed in a cylindrical shape in which a steel plate or a mesh plate in which a plurality of small holes are formed can be inserted into the communication hole 26, and communicates with the outside of the communication hole 26 in which the filter 36 is inserted. The other end to be sealed is sealed with a screw member 27. The lubricating oil in the concave groove 11a flowing from one end of the communication hole 26 enters the inside of the filter 36 inserted into the communication hole 26 and is filtered by passing from the inside to the outside. Is done. Thus, the lubricating oil filtered by the filter 36 is configured to flow into the front and rear holes 25 from the rear end.

  As shown in FIGS. 1 and 3, the front and rear holes 25, one end of which is continuous with the communication hole 26, are formed so as to spread in the width direction of the transmission 10 and have a non-circular cross section. It is formed to be wider than the cross-sectional area of 26. As described above, the front and rear holes 25 constitute the oil suction flow path 23, but the cross-sectional area is enlarged compared to the cross-sectional area of the communication hole 26 forming the oil suction flow path 23. Therefore, the flow rate of the lubricating oil flowing through the oil suction passage 23 is reduced. In this respect, the front and rear holes 25 constitute a settling chamber 25 for settling foreign matter contained in the lubricating oil.

  The first oil flow path 24 having such a communication hole 26 and a front and rear hole 25 that is a settling chamber sucks the lubricating oil accumulated in the concave groove 11a from the communication hole 26 that is one end, and a clutch at the front end of the front and rear hole 25. It is comprised so that it may guide to the connection surface with the housing 20. FIG.

  In this embodiment, the front and rear holes 25 that form a settling chamber with a transverse section extending in the width direction of the transmission 10 are formed by opening the other front end to the end edge connected to the clutch housing 20, The settling chamber 25 is formed in the first oil flow path 24 in the front portion of the gear case 11 sealed in the clutch housing 20.

  The settling chamber 25 is formed with a deep portion 25b in which the bottom surface 25a is further lowered in the vicinity of the opening end of the front portion of the gear case 11. By this deep portion 25b, the front and rear holes 25 forming the settling chamber are configured to further expand the cross-sectional area in the vicinity of the front end opening end of the gear case 11. And when the sedimentation chamber 25 has this deep part 25b, it is comprised so that the lubricating oil which flows through the sedimentation chamber 25 may be convected in this deep part 25b (FIG. 6).

  The gear case 11 is formed with a female screw hole 11b so as to penetrate the front / rear hole 25 from the outside, which is below, and the female screw hole 11b extends from the concave groove 11a to the front / rear hole 25 through the communication hole 26. A screw 28 made of a magnet for attracting and removing metallic foreign matter from the flowing lubricating oil is screwed.

  Returning to FIG. 1, the second oil flow path 31 in the clutch housing 20 includes a horizontal hole 32 that is continuous with the front and rear holes 25 formed in the gear case 11, and a vertical portion in which the lower part continues to the horizontal hole 32 and extends in the vertical direction. The hole 33 is formed. Each of the horizontal hole 32 and the vertical hole 33 is a hole having a circular cross section, and is formed to have a cross-sectional area equivalent to the cross-sectional area of the communication hole 26 formed in the gear case 11. A horizontal hole 32 communicates with the vertical hole 33, and a through hole 33 e communicating with the oil pump 19 is formed at an upper portion of the vertical hole 33.

  The clutch housing 20 is provided at the front end of the gear case 11, so that the gear case 11 is configured to seal the front end of the front and rear holes 25 constituting the sedimentation chamber. Then, in a state where the front end of the gear case 11 is sealed by the clutch housing 20, the lateral hole 32 is formed open to the end face of the gear case 11 so that the end portion communicates with the front and rear holes 25 which are settling chambers.

  Here, the lateral hole 32 constituting the second oil flow path 31 is configured to be biased and continuous with the sedimentation chamber 25. Specifically, as shown in FIG. 6, the lateral hole 32 has an end opened at the top of the settling chamber 25 so as not to face the deep portion 25 b of the settling chamber 25, and as shown in FIG. 5, An end portion of the front and rear hole 25 that extends in the width direction of the transmission 10 and forms a sedimentation chamber is opened from the center of the gear case 11. As shown by solid line arrows in FIGS. 5 and 6, the lubricating oil is formed so as to cause convection in the remaining portion of the settling chamber 25 where the horizontal holes 32 as the second oil flow paths 31 are not continuous.

  As shown in FIGS. 4 to 6, the clutch housing 20 provided so as to seal the settling chamber 25 includes a part of the settling chamber 25 in which the lateral hole 32 as the second oil flow path 31 is continuous, A projecting piece 22 that separates the remaining portion of the settling chamber 25 that causes convection in the lubricating oil without the horizontal holes 32 that are the two oil passages 31 being continuous is formed so as to protrude into the settling chamber 25. In this embodiment, a recess 21 having an outer diameter corresponding to the outer diameter of the open end surface of the settling chamber 25 is formed on the end surface of the clutch housing 20, and the end of the lateral hole 32 opens to the recess 21. Formed. A projecting piece 22 that surrounds the lateral hole 32 protrudes from the recess 21 at the hole edge of the lateral hole 32 so that the end edge is flush with the end edge of the clutch housing 20. And the protrusion 22 formed in the hole edge of the horizontal hole 32 which protrudes from the recessed part 21 is a part of the sedimentation chamber 25 in which the lateral hole 32 continues, and the remainder of the sedimentation chamber 25 which produces a convection in lubricating oil. It is comprised so that it may partition.

  Returning to FIG. 1, the lower end of the vertical hole 33 in which the horizontal holes 32 are continuous is formed open to the lower outside of the clutch housing 20. A female screw 33d is formed around the inside of the lower end of the opened vertical hole 33, and a mounting screw 34 is screwed to the female screw 33d. The mounting screw 34 is provided so as to seal the lower end (the other end) of the vertical hole 33 by being screwed onto the female screw 33d.

  The mounting screw 34 screwed to the female screw 33d is made of a magnet, and the metal contained in the lubricating oil when the lubricating oil flowing into the horizontal hole 32 from the front / rear hole 25, which is a settling chamber, moves up the vertical hole 33. It is configured to adsorb and remove foreign material.

  Next, the operation of the vehicle transmission configured as described above will be described.

  The vehicle transmission 10 according to the present invention is used by being mounted on a truck as a vehicle, and a predetermined amount of lubricating oil is injected and stored in the gear case 11. When the engine (not shown) is driven, the countershaft 16 is rotated by the rotation of the engine directly transmitted from the input shaft 13, and the oil in the gear case 11 is oiled by the oil pump 19 driven by the rotation of the countershaft 16. The oil is sucked through the suction flow passage 23 and supplied from the oil pump 19 to each lubrication-required portion for forced lubrication.

  The lubricating oil that has lubricated the necessary portions of the lubricant then returns to the inner bottom of the gear case 11. The lubricating oil that has returned to the inner bottom portion of the gear case 11 is then sucked again by the oil pump 19 through the oil suction passage 23, and again lubricates the places requiring lubrication. The transmission 10 is provided with gears and friction materials for transmitting the driving force from the engine, so that the lubricating oil that has lubricated each lubricated portion and returned to the inner bottom portion of the gear case 11 is provided. Foreign matter may be mixed in.

  The lubricating oil that has returned to the inner bottom of the gear case 11 is then sucked from one end of the communication hole 26. The lubricating oil flowing into the communication hole 26 enters the inside of the filter 36 inserted into the communication hole 26 and is filtered by passing from the inside to the outside. The lubricating oil filtered by the filter 36 flows into the front and rear holes 25 from the rear end.

  On the other hand, in the filter 36 that is formed in a cylindrical shape and is inserted into the communication hole 26 that is the oil suction channel 23, the lubricating oil that flows into the communication hole 26 does not enter the inside of the filter 36 and moves outward from the beginning. There is also a case of entering. In this case, the lubricating oil does not pass from the inner side to the outer side of the filter 36 and flows into the front and rear holes 25 without removing foreign matters in the lubricating oil.

  However, in the vehicle transmission 10 according to the present invention, the sedimentation chamber 25 for reducing the flow velocity of the lubricating oil flowing in the oil suction passage 23 is formed in the oil suction passage 23, and therefore flows in the oil suction passage 23 together with the lubricant. Since the flow rate of the lubricating oil decreases in the front and rear holes 25 that are settling chambers, the foreign matter settles in the settling chamber 25 due to its own weight. For this reason, the amount of foreign matter that flows downstream from the settling chamber 25 and reaches the oil pump 19 is reduced.

  On the other hand, as shown in FIG. 6, the lateral hole 32 formed in the clutch housing 20 has an end opened at the upper portion of the settling chamber 25 so as not to face the deep portion 25 b of the settling chamber 25, and the horizontal hole 32. The projecting piece 22 is formed so as to protrude from the hole edge so as to surround the lateral hole 32. For this reason, as shown by the solid line arrow in FIG. 6, a flow of lubricating oil that flows straight into the horizontal hole 32 occurs in a part of the upper part of the settling chamber 25, and the settling chamber in the vicinity of the deep portion 25 b where the horizontal hole 32 is not continuous. In the remaining part at the lower part of 25, convection of the lubricating oil occurs.

  Further, as shown in FIG. 5, the lateral hole 32 opens in an end portion from the center of the gear case 11 of the front and rear holes 25 that spread in the width direction of the transmission 10 to form a settling chamber. The projecting piece 22 is formed so as to protrude from the hole edge so as to surround the lateral hole 32. For this reason, as shown by a solid line arrow in FIG. 5, a flow of lubricating oil that flows straight into the horizontal hole 32 occurs in a part of the settling chamber 25 near the center of the gear case 11, and the gear case 11 is not continuous. In the remainder of the outer settling chamber 25 in the width direction, convection of the lubricating oil occurs.

  As described above, when the convection of the lubricating oil indicated by the solid line arrows in FIGS. 5 and 6 occurs in the settling chamber 25, the time for staying in the settling chamber 25 by convection of foreign matters together with the lubricating oil is extended. Then, a large amount of foreign matter in the lubricating oil settles in the sedimentation chamber 25 due to its own weight. As a result, the amount of foreign matter that flows downstream from the settling chamber 25 is further reduced. And since the protruding piece 22 which partitions off the part of the sedimentation chamber 25 with which the horizontal hole 32 which is the 2nd oil flow path 31 continues and the remainder of the sedimentation chamber 25 which produces a convection in lubricating oil was formed, the convection is made more It can be generated reliably.

  Further, since the settling chamber 25 or the screws 28 and 34 made of magnets for adsorbing metal foreign matter are provided in the oil suction passage 23 downstream of the settling chamber 25, the metal foreign matter is adsorbed by the magnet and oil The amount of foreign matter reaching the pump 19 can be reliably reduced.

  On the other hand, the screw 28 and the mounting screw 34, which are magnets that attract metal foreign objects, can be detached from the gear case 11 and the clutch housing 20 because of screws. For this reason, the foreign matter adsorbed by the screw 28 and the mounting screw 34 is removed in the maintenance and inspection of the transmission 10 in which the screw 28 and the mounting screw 34 need to be removed. In this case, the screw 28 and the mounting screw 34 that adsorb foreign matter can be removed in a simple operation by simply removing the screw 28 and the mounting screw 34, and the foreign matter can be easily removed.

  Further, since the filter 36 is inserted into the communication hole 26 and the communication hole 26 is opened to the outside and sealed with the screw member 27, the filter 36 can be removed simply by removing the screw member 27. Thus, maintenance and inspection of the filter 36 and its management are facilitated.

  In the above-described embodiment, the case where the front and rear holes 25 that are settling chambers are formed in the gear case 11 has been described. However, the place where the settling chamber 25 is formed may be the oil suction passage 23, and thus is limited to the gear case 11. Instead, it may be formed in the clutch housing 20.

DESCRIPTION OF SYMBOLS 10 Transmission 11 Gear case 19 Oil pump 20 Clutch housing 22 Projection piece 23 Oil suction flow path 24 First oil flow path 25 Front and rear holes (sedimentation chamber)
28 Screw (Magnet)
31 Second oil passage 34 Mounting screw (magnet)

Claims (4)

In the vehicle transmission in which the oil suction passage (23) through which the oil pump (19) sucks the lubricating oil inside the gear case (11) is formed,
A sedimentation chamber (25) is formed in the oil suction flow path (23) to reduce the flow rate of the lubricating oil flowing in the oil suction flow path (23) by enlarging the cross-sectional area of the oil suction flow path (23). A vehicle transmission characterized by the above. An oil pump (19) is provided in the clutch housing (20) that seals the front end of the gear case (11).
An oil suction passage (23) is formed in the clutch housing (20) so as to be continuous with the first oil passage (24) formed in the gear case (11) and the first oil passage (24). A second oil flow path (31),
A settling chamber (25) is formed in the first oil passage (24) at the front of the gear case (11) sealed in the clutch housing (20),
The second oil flow path (31) is biased and continuous with the settling chamber (25), and convection is generated in the lubricating oil in the remaining portion of the settling chamber (25) where the second oil flow path (31) is not continuous. The vehicle transmission according to claim 1 formed as described above.   A settling chamber (25) in which the second oil flow path (31) continues to the clutch housing (20) and a settling chamber (25) that causes convection in the lubricating oil without the second oil flow path (31) being continuous. The vehicular transmission according to claim 2, wherein a projecting piece (22) for partitioning the remaining portion of (25) is formed so as to project into the settling chamber (25).   The magnet (28, 34) for adsorbing metal foreign matter is detachably provided in the settling chamber (25) or the oil suction passage (23) downstream from the settling chamber (25). The vehicle transmission as set forth in claim 1.

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