JP2009097604A - Power train - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power train for preventing oil leakage from the inside of a case body of a transmission. <P>SOLUTION: This power train 10 has the transmission 36, a propeller shaft 21 and an oil leakage preventive ring 81. The transmission 36 includes an output shaft 52 and an extension housing 39 for arranging the output shaft 52 together with oil and forming an opening 68. The propeller shaft 21 is connected to the output shaft 52 via the opening 68 for transmitting motive power from the transmission 36. The oil leakage preventive ring 81 is arranged at the output shaft 52, and arranged in a position X in the extension housing 39. The oil leakage preventive ring 81 is moved up to the position X from a position for blocking up the opening 68 by being pressed by the propeller shaft 21 when connecting the propeller shaft 21 to the output shaft 52. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention generally relates to a power train, and more particularly to a power train in which an output shaft of a transmission and a propeller shaft are spline-coupled.

Regarding a conventional power train, for example, Japanese Patent Laid-Open No. 7-103319 discloses a lubricating device for an extension housing of an automatic transmission for the purpose of preventing leakage of hydraulic oil when the automatic transmission is mounted on a vehicle. (Patent Document 1). In Patent Document 1, an automatic transmission includes an extension housing, an output shaft disposed in the extension housing, and an opening for inserting a sleeve yoke fitted to the output shaft. When the automatic transmission is shipped and transported, a shopping cap is disposed on the automatic transmission so as to close the opening.
JP-A-7-103319

  As disclosed in Patent Document 1 described above, when the automatic transmission is shipped and transported to a vehicle assembly factory, a shopping cap is attached to contain hydraulic oil in the extension housing.

  However, at the stage of mounting the automatic transmission on the vehicle at the vehicle assembly factory, it is necessary to connect the propeller shaft to the automatic transmission, so the shopping cap is removed. The automatic transmission may be mounted rearward and downward due to restrictions on vehicle mounting, and in this case, in particular, oil easily leaks from the extension housing. As a result, there is a risk that sufficient lubrication cannot be obtained immediately after the vehicle engine is started.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problem and to provide a power train that prevents oil leakage from the inside of a case body of a transmission.

  The power train according to the present invention includes a transmission, a propeller shaft, and an oil leakage prevention member. The transmission includes an output shaft and a case body in which the output shaft is disposed together with oil and an opening is formed. The propeller shaft receives power from the transmission and is connected to the output shaft through the opening. The oil leakage prevention member is provided on the output shaft and is disposed at the first position inside the case body. The oil leakage prevention member is moved from the second position to close the opening to the first position by being pressed by the propeller shaft when the propeller shaft is connected to the output shaft.

  According to the power train configured as described above, oil inside the case body leaks through the opening by the oil leakage prevention member arranged at the second position in a state where the propeller shaft is not connected to the output shaft. Can be prevented. Further, when the propeller shaft is connected to the output shaft, the oil leakage prevention member is pressed by the propeller shaft and moves to the first position inside the case body, so that it is not necessary to remove the oil leakage prevention member from the output shaft. For this reason, when the transmission is mounted on the vehicle, oil inside the case body can be prevented from leaking through the opening.

  Preferably, the output shaft includes a spline portion in which a spline is formed. A seal member is disposed on the periphery of the spline portion. The oil leakage prevention member has a ring shape that closes the gap between the spline portion and the seal member at the second position. The oil leakage preventing member is fitted to the spline portion so as to be movable in the axial direction of the output shaft. According to the power train configured as described above, when the propeller shaft is connected, the oil leakage prevention member is moved from the second position to the first position shifted in the axial direction of the output shaft, so that the spline portion and the seal member are Oil can be prevented from leaking through the gap between the two.

  Preferably, the oil leakage preventing member is formed from a material having elasticity. According to the power train configured as described above, the oil leakage prevention member is elastically deformed and fitted into the spline portion at the second position, thereby reliably closing the gap between the spline portion and the seal member. Can do.

  Preferably, the transmission includes a support portion that rotatably supports the propeller shaft. In a state where the oil leakage prevention member is arranged at the second position, the oil leakage prevention member and the support portion are arranged apart from each other. According to the power train configured as described above, since the oil leakage preventing member and the support portion are disposed apart from each other, the support portion can be immersed in oil. Thereby, sufficient oil can be interposed between the propeller shaft and the support portion immediately after starting after connecting the propeller shaft.

  As described above, according to the present invention, it is possible to provide a power train that prevents oil leakage from the inside of the case body of the transmission.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

  FIG. 1 is a plan view showing a drive system of a vehicle equipped with a power train according to an embodiment of the present invention. Referring to FIG. 1, the powertrain in the present embodiment is mounted on an FR-based full-time 4WD vehicle.

  An engine 37 is vertically arranged in the engine room in front of the vehicle. A transmission 36 is connected to the crankshaft of the engine 37. The transmission 36 is integrally provided with a transfer 38. The transmission 36 outputs the motive power input from the engine 37 by decelerating or accelerating or outputting it in the reverse rotation. The transfer 38 distributes the power output from the transmission 36 to the front drive shaft 25 and the rear drive shaft 26 at an appropriate ratio according to the traveling state.

  A propeller shaft 21 is connected to the transmission 36. The propeller shaft 21 is disposed between the transmission 36 and a rear differential 41 provided on the rear drive shaft 26. The propeller shaft 21 extends from the front of the vehicle toward the rear of the vehicle. The propeller shaft 21 transmits the power input from the transmission 36 to the rear differential 41.

  The transmission 36 is mounted on the vehicle in a state where it is tilted vertically downward from the side connected to the engine 37, that is, the front end side of the vehicle, to the side connected to the propeller shaft 21, that is, the rear end side of the vehicle. . The transmission 36 is mounted on the vehicle in a rearward downward posture.

  2 is a cross-sectional view showing a side surface at a position surrounded by a two-dot chain line II in FIG. Referring to FIG. 2, power train 10 in the present embodiment includes a transmission 36, a propeller shaft 21, and an oil leakage prevention ring 81.

  The transmission 36 includes an output shaft 52. The output shaft 52 rotates around the central shaft 101 and outputs power. The transmission 36 includes an extension housing 39. The extension housing 39 is disposed on the rearmost side of the vehicle in the case body that forms the outer shell of the transmission 36. An output shaft 52 is disposed in the extension housing 39 together with oil.

  An opening 68 is formed in the extension housing 39. The opening 68 is formed at the vehicle rear end of the extension housing 39. The propeller shaft 21 is inserted into the extension housing 39 through the opening 68. The propeller shaft 21 is connected to the output shaft 52 through the opening 68. The propeller shaft 21 rotates around the central axis 101 together with the output shaft 52. The output shaft 52 protrudes outside the extension housing 39 through the opening 68.

  The output shaft 52 and the propeller shaft 21 include a spline portion 53 and a spline portion 72, respectively. The spline part 53 and the spline part 72 are formed at the tips of the output shaft 52 and the propeller shaft 21, respectively. In the spline portion 53, splines are formed on the outer peripheral surface of the output shaft 52. In the spline portion 72, a spline is formed on the inner peripheral surface of the cylindrical propeller shaft 21. The spline portion 53 and the spline portion 72 are spline-engaged so that the output shaft 52 of the transmission 36 and the propeller shaft 21 are connected. The extension housing 39 has a cylindrical shape surrounding the outer periphery of the spline portion 53 and the spline portion 72.

  The transmission 36 includes a bush 66 as a support portion. The bush 66 is made of metal. The bush 66 is fixed to the extension housing 39. The bush 66 has a ring shape. A propeller shaft 21 is inserted inside the bush 66. The bush 66 rotatably supports the propeller shaft 21. The bush 66 is disposed inside the extension housing 39. The bush 66 is disposed at a position adjacent to the opening 68.

  The transmission 36 includes an oil seal 64 as a seal member. The oil seal 64 has a ring shape. The oil seal 64 is fixed to the extension housing 39. The oil seal 64 is fitted on the outer periphery of the propeller shaft 21. A gap that forms an opening 68 is formed between the oil seal 64 and the output shaft 52. A propeller shaft 21 is inserted so as to close the gap.

  The transmission 36 includes a dam plate 62 as an oil reservoir member. The dam plate 62 is fixed to the extension housing 39. The dam plate 62 has a ring shape arranged on the outer periphery of the output shaft 52. A gap is formed between the weir plate 62 and the output shaft 52. An oil sump space 63 is formed between the output shaft 52 and the propeller shaft 21 and the extension housing 39. The oil sump space 63 is defined between the barrier plate 62 and the oil seal 64 in the axial direction of the central shaft 101. An oil passage 54 is formed in the output shaft 52. The oil passage 54 communicates with the oil sump space 63. The oil supplied through the oil passage 54 and stored in the oil sump space 63 lubricates between the bush 66 and the propeller shaft 21. The oil stored in the oil reservoir space 63 is discharged from the gap between the dam plate 62 and the output shaft 52 at any time.

  The oil leakage prevention ring 81 is provided on the output shaft 52. The oil leakage prevention ring 81 has a ring shape. The oil leakage prevention ring 81 is fitted on the output shaft 52. The oil leakage prevention ring 81 is fitted to the spline portion 53. The oil leakage prevention ring 81 is fitted to the output shaft 52 so as to be movable in the axial direction of the output shaft 52, that is, in the axial direction of the central shaft 101.

  The oil leakage prevention ring 81 is disposed at a position X in the axial direction of the central shaft 101. The position X will be described in detail. The oil leakage prevention ring 81 is disposed inside the extension housing 39. The oil leakage prevention ring 81 is disposed adjacent to the propeller shaft 21 in the axial direction of the central shaft 101. The oil leakage prevention ring 81 is disposed adjacent to the spline portion 72 in the axial direction of the central shaft 101. The oil leakage prevention ring 81 is disposed at a position shifted from the propeller shaft 21 in the connecting direction of the propeller shaft 21 to the output shaft 52 (the direction from the right side to the left side in FIG. 2). The oil leakage prevention ring 81 is disposed in the oil sump space 63.

  The propeller shaft 21 moves in the axial direction of the central shaft 101 in accordance with the traveling state of the vehicle while engaging the spline portion 72 with the spline portion 53. In FIG. 2, the oil leakage prevention ring 81 and the propeller shaft 21 are shown in contact with each other, but the oil leakage prevention ring 81 and the propeller shaft 21 are also connected even when the propeller shaft 21 moves to the front side of the vehicle. A gap may be formed between the two so as not to interfere.

  FIG. 3 is a cross-sectional view showing a state where the propeller shaft is not connected to the transmission in FIG. 4 is a cross-sectional view of the transmission along the line IV-IV in FIG.

  With reference to FIGS. 3 and 4, the oil leakage prevention ring 81 is disposed at the position Y in the axial direction of the central shaft 101 in a state where the propeller shaft 21 is not connected to the transmission 36. The oil leakage prevention ring 81 is disposed so as to close the opening 68. The oil leakage prevention ring 81 is disposed so as to close a gap between the oil seal 64 that forms the opening 68 and the output shaft 52. The oil leakage prevention ring 81 is disposed away from the bush 66 at a position Y that closes the opening 68.

  The oil leakage prevention ring 81 is formed from an elastic material. The oil leakage prevention ring 81 is made of, for example, elastic resin or rubber. A spline corresponding to the spline portion 53 is formed on the inner peripheral surface of the oil leakage prevention ring 81. The oil leakage prevention ring 81 has a shape that can be balanced when rotated around the central axis 101. The oil leakage prevention ring 81 is press-fitted into the spline part 53 in an elastically deformed state. With such a configuration, even when the accuracy of the spline formed on the oil leakage prevention ring 81 is inferior, the oil leakage prevention ring 81 and the spline portion 53 can be reliably adhered.

  Referring to FIGS. 2 and 3, oil leakage prevention ring 81 is moved from position Y closing position 68 to position X by being pressed against propeller shaft 21 when propeller shaft 21 is connected to output shaft 52. The

  The powertrain 10 according to the embodiment of the present invention includes a transmission 36, a propeller shaft 21, and an oil leakage prevention ring 81 as an oil leakage prevention member. The transmission 36 includes an output shaft 52 and an extension housing 39 as a case body in which the output shaft 52 is disposed together with oil and an opening 68 is formed. The propeller shaft 21 receives power from the transmission 36 and is connected to the output shaft 52 through the opening 68. The oil leakage prevention ring 81 is provided on the output shaft 52 and is disposed at a position X as a first position inside the extension housing 39. The oil leakage prevention ring 81 is moved from the position Y as the second position to close the opening 68 to the position X by being pressed by the propeller shaft 21 when the propeller shaft 21 is connected to the output shaft 52.

  Then, the assembly method of the power train in FIG. 2 is demonstrated. FIG. 5 is a flowchart showing the steps of the powertrain assembling method in FIG.

  Referring to FIG. 5, the transmission 36 is assembled at the transmission assembly factory (S101). The transmission 36 is filled with oil, and the operation state of the transmission 36 is inspected (S102). At the time of inspection, an inspection jig is inserted so as to close the opening 68.

  Referring to FIGS. 3 and 5, an oil leakage prevention ring 81 is assembled to transmission 36 (S103). The transmission 36 is shipped from the transmission assembly factory to the vehicle assembly factory and transported (S104). At this time, since the opening 68 is closed by the oil leakage prevention ring 81, the oil sealed in the oil reservoir space 63 does not leak through the opening 68. Further, since the oil leakage prevention ring 81 is disposed away from the bush 66, the bush 66 is in a state where it can easily be immersed in the oil stored in the oil reservoir space 63.

  FIG. 6 is a cross-sectional view showing the step shown in S105 in FIG. Referring to FIGS. 5 and 6, in the vehicle assembly plant, transmission 36 is mounted on the vehicle, and transmission 36 and propeller shaft 21 are connected (S105).

  At this time, the propeller shaft 21 is moved along the axial direction of the central shaft 101 while the spline portion 72 is engaged with the spline portion 53. The oil leakage prevention ring 81 is pressed by the propeller shaft 21 and moves from a position Y that closes the opening 68 to a position X inside the extension housing 39. By such a process, the opening 68 is maintained in a state of being sequentially closed by the oil leakage prevention ring 81 and the propeller shaft 21. For this reason, it is possible to prevent the oil sealed in the oil sump space 63 from leaking through the opening 68 when the transmission 36 is mounted on the vehicle. In particular, in the present embodiment, the transmission 36 is mounted on the vehicle in a rearwardly lowered posture, but oil leakage can be reliably prevented despite such a mounting posture.

  According to the power train 10 of the embodiment of the present invention configured as described above, it is not necessary to remove the oil leakage prevention ring 81 when the transmission 36 is mounted on the vehicle. Oil can be sufficiently interposed between the shaft 21 and the shaft 21. Thereby, the seizure resistance of the bush 66 immediately after the engine is started can be improved. Further, after the transmission 36 is mounted on the vehicle, the oil leakage prevention ring 81 stays inside the extension housing 39, and there is no possibility that the output shaft 51 is rattled due to the coupling by the spline. For this reason, the oil leakage prevention ring 81 does not impair the functions of the transmission 36 and the propeller shaft 21. Further, the oil leakage prevention ring 81 can be applied without causing a significant design change of the existing transmission 36.

  In the present embodiment, the case where the power train according to the present invention is applied to the 4WD vehicle in FIG. 1 has been described. However, the present invention is not limited to the 4WD vehicle and can also be applied to the FR vehicle.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a top view which shows the drive system of the vehicle by which the power train in embodiment of this invention is mounted. It is sectional drawing which shows the side surface of the position enclosed with the dashed-two dotted line II in FIG. FIG. 3 is a cross-sectional view showing a state where a propeller shaft is not connected to the transmission in FIG. 2. FIG. 4 is a cross-sectional view of the transmission along the line IV-IV in FIG. 3. It is a flowchart figure which shows the process of the assembly method of the power train in FIG. It is sectional drawing which shows the process shown to S105 in FIG.

Explanation of symbols

  10 Powertrain, 21 Propeller shaft, 36 Transmission, 39 Extension housing, 52 Output shaft, 53 Spline part, 64 Oil seal, 66 Bush, 68 Opening, 81 Oil leak prevention ring.

Claims (4)

A transmission including an output shaft, and a case body in which the output shaft is disposed together with oil, and an opening is formed;
Power is transmitted from the transmission, and a propeller shaft connected to the output shaft through the opening,
An oil leakage preventing member provided on the output shaft and disposed at a first position inside the case body;
The oil leakage prevention member is moved from a second position that closes the opening to the first position by being pressed by the propeller shaft when the propeller shaft is connected to the output shaft. The output shaft includes a spline part in which a spline is formed,
A seal member is disposed on the periphery of the spline portion,
The oil leakage prevention member has a ring shape that closes a gap between the spline portion and the seal member at the second position, and is fitted to the spline portion so as to be movable in the axial direction of the output shaft. The power train according to claim 1.   The power train according to claim 2, wherein the oil leakage prevention member is formed of a material having elasticity. The transmission includes a support portion that rotatably supports the propeller shaft,
4. The power train according to claim 1, wherein the oil leakage prevention member and the support portion are spaced apart in a state where the oil leakage prevention member is disposed at the second position. 5. .

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