JP2015055254A - Automobile transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to lubrication by effectively introducing oil which is scraped up in a gear case to a control part without using a new part.SOLUTION: An automobile transmission comprises a gear case 11, and an upper cover 21 arranged at an oil block part 11d at an upper part of the gear case 11, and is constituted so as to flip up oil stored in the gear case 11 by the rotation of a gear. An upper part continuing to the oil block part 11d, which is a sidewall 11f of the gear case 11 at a side at which the oil is scraped up, is bent while bulging to the outside, and an oil hole 11c communicating to a space covered with the upper cover 21 from the inside of the gear case 11 is formed at the oil block part 11d so as to continue to an upper part of the bent sidewall 11f. The oil hole 11c is formed at an upper part of the gear which scrapes up the oil.

Description

  The present invention relates to an automobile transmission that splashes oil contained in a gear case onto a lubricated portion by rotation of a gear.

  Conventionally, a transmission for an automobile 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 each of the high speed gears provided on the shaft and the output shaft by the movement of the shifter rod. Lubricating such an automobile transmission stores oil for lubrication to the extent that the countershaft is immersed in the gear case that accommodates the countershaft, and the countershaft rotates to rotate the countershaft and output. Each speed gear on the shaft drives up the oil and promotes lubrication of each part.

  On the other hand, in such a transmission, although the meshing of each gear is changed by moving the shifter rod, a control unit for moving the shifter rod is provided at the upper part of the gear case. The control unit is covered with an upper cover attached to the upper part of the gear case. The control unit includes a select lever shaft sealed with an oil seal on the upper cover, a select lever attached to the select lever shaft, And a sliding lever engaged with the tip of the select lever, and a lower part of the sliding lever is configured to engage with the shifter rod.

  Even in the control portion covered with the upper cover, there is a portion that rotates or slides, and therefore it is necessary to lubricate. If this lubrication is performed with the oil that each speed gear lifts up, and the oil splashes directly on the select lever shaft pivotally supported by the upper cover, the oil seal of the select lever shaft may be insufficiently sealed. If the oil seal has a poor contact due to deterioration or the like, the oil leaks to the outside from the insertion portion of the select lever shaft in the upper cover, and the periphery of the select lever shaft is contaminated with oil.

  In order to solve this problem, it has been proposed to provide an oil shielding part so that the select lever shaft crosses below the portion passing through the upper case (see, for example, Patent Document 1). In such a transmission for an automobile, the oil shielding part blocks the oil that has been scooped up to prevent the oil from directly splashing on the select lever shaft. It is possible to prevent leaks.

Japanese Utility Model Publication No. 5-83528

  However, when an oil shield is provided, the oil that is swept up by each gear in the gear case reaches the control part only through the insertion hole through which the sliding lever is inserted by communicating the control part and the inside of the gear case. This causes a problem that the amount of oil for lubricating the control unit is insufficient. Particularly in recent years, an interlock plate that prevents an erroneous shift operation is provided in the insertion hole through which the sliding lever is inserted, so that the opening where the oil scraped up inside the gear case reaches the control unit is further provided. It tends to narrow.

  In order to eliminate this point, forced lubrication piping using an oil pump is installed in the control unit, and the control unit is lubricated with oil supplied to the control unit via the piping by the oil pump. Conceivable. However, laying lubrication piping increases the number of parts, which increases the size of the transmission itself and increases the unit price of the transmission obtained from the increase in laying work.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an automotive transmission that can effectively guide oil that has been scraped up inside a gear case to a control unit and use it for lubrication of the control unit without using new parts.

  The present invention is an improvement of a transmission for an automobile that includes a gear case and an upper cover provided on an oil shielding portion at the upper part of the gear case, and splashes up oil contained in the gear case by rotation of the gear.

  The characteristic configuration is the side wall of the gear case 11 on the side where the oil is scraped up, and is curved so that the upper part continuing to the oil shielding part bulges outward, and is covered by the upper cover from the inside of the gear case. The oil hole communicating with the space is formed in the oil shielding portion so as to continue to the upper part of the curved side wall.

  In this case, the oil hole is preferably formed above the gear for scooping up the oil.

  In the automobile transmission of the present invention, the upper part of the side wall of the gear case on the side where the oil is scraped is curved, so that by rotating the countershaft, each of the high-speed gears on the countershaft and the output shaft lifts up the oil. A part adheres to the upper inner surface of the curved side wall of the gear case and rises along the curved shape. And since the oil hole is formed in the oil shielding part so as to be continuous with the curved side wall, the oil rising on the curved side wall passes through the oil shielding part from the oil hole and reaches above it. The oil reaching above the oil shielding portion lubricates the control portion provided in the space covered by the oil shielding portion and the upper cover. Therefore, according to the present invention, the oil that has been scraped up can be effectively guided to the oil hole and used for lubrication of the control unit without using new parts.

  In this case, if the oil hole is formed above the gear that scoops up the oil, the oil scooped up by the gear is more effectively guided to the oil hole, and a relatively large amount of oil is guided to the control unit. Can do.

It is sectional drawing of the gear case cut | disconnected by the BB line of FIG. 3 of the transmission for motor vehicles of this invention embodiment. It is a perspective view of the gear case upper surface which removed the upper cover. It is a longitudinal cross-sectional view of the transmission for vehicles.

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

  As shown in FIG. 3, a transmission 10 for an automobile according to the present invention has a main shaft 12 extending in the front-rear direction of the automobile on the upper side inside a gear case 11 thereof. The gear case 11 is a cast product, and 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. The countershaft 16 is supported by tapered roller bearings 17 and 18 using rolling elements whose front and rear portions are conical rollers, respectively.

  A high speed gear 13 a is provided on the input shaft 13, and a drive gear 16 a that meshes with the high speed gear 13 a is provided on the counter shaft 16. The counter shaft 16 behind the drive gear 16a is provided with each of the high-speed gears 15a to 15e, and the step gears 15g to 15l meshing with these are provided on the output shaft 14.

  As a result, the transmission 10 transmits the rotation input from the input shaft 13 to the counter shaft 16 via the drive gear 16a meshing with the high speed gear 13a on the input shaft 13, and the output on the counter shaft 16 is output. The gears 15g to 15l and 15a to 15e provided on the shaft 14 are changed in meshing to transmit engine torque to drive wheels (not shown). Here, reference numeral 19 in FIG. 3 denotes a shifter rod 19 that changes the meshing of the respective high-speed gears 15g to 15l and 15a to 15e by extending in the front-rear direction and moving in the axial direction.

  In the automobile transmission 10, a control unit 20 that moves the shifter rod 19 is provided on the upper part of the gear case 11. The control unit 20 is covered with an upper cover 21 attached to the upper part of the gear case 11, and the upper cover 21 is fixed to the gear case 11 with bolts 22 (FIG. 1).

  That is, as shown in FIGS. 1 and 2, on the upper surface of the gear case 11, a protrusion 11a for attaching the upper cover 21 (FIGS. 1 and 3) protrudes upward and is formed in an annular shape. A plurality of female screw holes 11b (FIG. 2) into which the bolts 22 (FIG. 1) are screwed are formed in the 11a at predetermined intervals. The upper part of the gear case 11 surrounded by the ridge 11a forms an oil shielding part 11d. The upper cover 21 is fixed to the gear case 11 by a bolt 22 (FIG. 1) that is screwed into the female screw hole 11b, and is covered with the upper case 21 on the oil shielding portion 11d surrounded by the ridge 11a. A control unit 20 (FIG. 3) is provided in the space.

  Returning to FIG. 3, the control unit 20 covered by the upper cover 21 includes a select lever shaft 23 sealed by an oil seal (not shown) on the upper cover 21, a select lever 24 attached to the select lever shaft 23, And a sliding lever 26 engaged with the tip of the select lever 24. The lower part of the sliding lever 26 is configured to engage with the shifter rod 19.

  As shown in FIGS. 1 and 2, the upper part of the gear case 11 surrounded by the ridge 11a is swept up by the respective high-speed gears 15a to 15e and 15g to 15l (FIG. 3) inside the gear case 11, as described above. The oil shielding part 11d that prevents the oil from reaching the control part 20 covered by the upper cover 21 is configured. The oil shielding portion 11d is configured to cover at least a portion below the portion where the select lever shaft 23 (FIG. 3) penetrates the upper cover 21, and the oil shielding portion 11d is inserted into the insertion hole 11e through which the sliding lever 26 is inserted. Is formed. The insertion hole 11e is provided with an interlock plate 27 (FIG. 2) that prevents an erroneous shift operation so as to be movable in the width direction.

  As shown in FIG. 3, each shifter rod 19 is provided with a shift rail jaw 31 (only part of which is shown). The shift rail jaw 31 is configured to be engageable with the lower portion of the sliding lever 26. The sliding lever 26 is movable in the axial direction of the gear shift shaft 32 by being spline-engaged with a gear shift shaft 32 provided through the upper cover 21 in the width direction, and is responsive to the axial position of the sliding lever 26. Thus, the lower part of the sliding lever 26 is selectively engaged with any one shift rail jaw 31 of the shifter rod 19.

  The sliding lever 26 is configured to be moved in the above direction by the select lever 24. The select lever 24 is attached to the lower end portion of the select lever shaft 23 provided on the upper cover 21 and can rotate around the shaft. A gear select operation arm 33 is attached to the upper end of the select lever shaft 23 that passes through the upper cover 21.

  As shown in FIG. 1, the characteristic configuration of the present invention is curved so that the upper side of the side wall 11f of the gear case 11 on the side where the oil is scraped and continues to the oil shielding portion 11d bulges outward in the longitudinal section. The oil hole 11c is formed in the oil shielding part 11d so as to continue from the inside of the gear case 11 to the space covered by the upper cover 21 so as to continue to the upper part of the curved side wall 11f.

  Here, the side wall 11f of the gear case 11 on the side where the oil is scraped is the side wall 11f on the side where the stepped gears 15g to 15l (FIG. 3) provided on the output shaft 14 rotate to scrape the oil. FIG. 1 shows a case where each of the step gears 15g to 15l rotates to the right as indicated by a solid arrow, so that the oil is scraped up from the left side. For this reason, in FIG. 1, the left side wall 11f in the drawing is formed to be curved.

  The inner surface of the curved side wall 11f is formed smoothly and continuously so that the scooped-up oil adheres and rises, and no barriers are formed on the inner surface to obstruct the flow of the attached oil. As long as the upper end is continuous with the oil shielding portion 11d, the lower end of the curved portion may be any shape. However, since the oil scooped up by each step gear 15g to 15l adheres to the upper inner surface of the smoothly curved side wall 11f and rises, the lower end is the side of the output shaft 14 (FIG. 3) constituting the main shaft 12. It is preferable to form from one side.

  Here, reference numeral 20 in FIG. 1 indicates a rear support wall 20 provided at the rear end of the gear case 11, and reference numeral 20 a indicates an output shaft 14 (FIG. 3) formed on the rear support wall 20. The 1st support hole 20a of this is shown. Moreover, the code | symbol 20b in FIG. 1 shows the 2nd support hole 20b for supporting the rear part of the countershaft 16 (FIG. 3) formed in the rear part support wall 20, and the code | symbol 20f is a shifter rod which moves to an axial direction. The rod hole 20f through which 19 (FIG. 3) is inserted is shown.

  On the other hand, the oil hole 11c is an oil shielding part 11d, and is formed so as to be able to pass oil rising on the curved part, being biased toward the side where the curved part of the side wall 11f is formed. Specifically, it is formed in the oil shielding part 11d so as to continue to the upper part of the curved side wall 11f along the inner surface of the curved ridge 11a on the curved side. 2 are elongated holes extending in the front-rear direction of the transmission 10, and are formed at two positions in the front-rear direction of the oil shielding part 11d. Specifically, the oil hole 11c is formed above the step gears 15h and 15i, corresponding to the position where the step gears 15h and 15i (FIG. 3) are provided. Then, as shown in FIG. 2, an oil return hole 11g is formed behind the oil shielding part 11d in order to return the oil that has entered the upper surface side of the oil shielding part 11d through the oil hole 11c.

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

  The automobile transmission 10 according to the present invention is used by being mounted on an automobile, but is mounted so that the rear side is positioned slightly below when mounted on the automobile. In this manner, a predetermined amount of lubricating oil is injected and stored in the gear case 11 attached at a predetermined mounting angle with the rear downward. This lubricating oil is injected to such an extent that the countershaft 16 is soaked in half.

  On the other hand, when the engine (not shown) is driven and the countershaft 16 rotates, each of the high-speed gears 15a to 15e on the countershaft 16 that is submerged in half of the oil scoops up the oil. Since each of the high-speed gears 15a to 15e on the counter shaft 16 meshes with each of the high-speed gears 15g to 15l on the output shaft 14, some of the oil scooped up by each of the high-speed gears 15a to 15e It adheres to the gears 15g to 15l. And each stage gear 15g-15l which meshes | engages and rotates to each high speed gear 15a-15e will further scoop up the adhering oil. Thus, the oil scooped up inside the gear case 11 lubricates the countershaft 16, the high-speed gears 15a to 15e, the output shaft 14 and the high-speed gears 15g to 15l.

  A part of the oil swept up by the step gears 15g to 15l on the output shaft 14 adheres to a curved portion formed on the side wall 11f of the gear case 11, and rises along the curved shape. Since the curved portion is formed so as to communicate with the oil hole 11c, as shown by the solid line arrow, the oil rising up the curved portion reaches above the oil shielding portion 11d from the oil hole 11c. 20 will be reached.

  For this reason, the interlock plate 27 is provided in the insertion hole 11e through which the sliding lever 26 is inserted, and even if the opening area of the insertion hole 11e through which oil will conventionally pass is narrowed by the interlock plate 27, Oil can be supplied above the oil shield 11d. Then, the oil lubricates the control unit 20 and the interlock plate 27 that slides in the control unit 20. Therefore, in the present invention, the oil scraped up inside the gear case 11 can be effectively guided to the control unit 20 and used for lubrication of the control unit 20 without using new parts.

  In particular, according to the present invention, the oil holes 11c are formed above the step gears 15h and 15i corresponding to the positions where the step gears 15h and 15i (FIG. 3) are provided. The oil scraped up by 15h and 15i can be guided to the oil hole 11c more effectively, and a relatively large amount of oil can be guided to the control unit 20.

  On the other hand, the transmission 10 for an automobile is attached to the automobile at a predetermined mounting angle with the rear side descending downward, so that the oil that has lubricated the control unit 20 is then inserted into the insertion hole 11e through which the sliding lever 26 is inserted, or the oil It flows rearward on the shielding part 11d and then flows back into the gear case 11 from an oil return hole 11g provided at the rear thereof.

DESCRIPTION OF SYMBOLS 10 Automobile transmission 11 Gear case 11c Oil hole 11d Oil shielding part 11f Side wall 21 Upper cover

Claims (2)

A gear case (11), and an upper cover (21) provided on an oil shielding portion (11d) on the upper side of the gear case (11), and the oil stored in the gear case (11) is splashed by rotation of the gear. In the automotive transmission to raise,
The side wall (11f) of the gear case (11) on the side where the oil is scraped up, and the upper part continuing to the oil shielding part (11d) is formed so as to bulge outward,
An oil hole (11c) communicating from the inside of the gear case (11) to the space covered by the upper cover (21) is formed in the oil shielding part (11d) so as to continue to the upper part of the curved side wall (11f). An automobile transmission characterized by being made.   The transmission for an automobile according to claim 1, wherein the oil hole (11c) is formed above a gear for scooping up the oil.

Images