JP4710118B2 - Transmission lubrication structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission lubrication structure, and more particularly to a transmission lubrication structure in which lubricating oil can be effectively supplied to a thrust portion of a transmission gear.
[0002]
[Prior art]
As a transmission for a vehicle, a so-called constantly meshing type in which a main shaft and a sub shaft are accommodated in a transmission case is known. This always-meshing type transmission has a plurality of main gears provided on the outer periphery of the main shaft so as to be relatively rotatable, and these main gears are provided with a plurality of counter gears provided on a counter shaft rotated by an input shaft. Always mesh and rotate.
[0003]
Then, a desired main gear is selected and shifted by the transmission mechanism.
[0004]
[Problems to be solved by the invention]
By the way, the main gear rotates relative to the main shaft as described above, and therefore, it is necessary to lubricate the thrust portion. In particular, the reverse gear rotates relative to the main shaft in the direction opposite to the main shaft at the time of forward movement, so that the relative speed is large and the lubrication is likely to be insufficient.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and provide a lubricating structure for a transmission that can effectively supply lubricating oil to a thrust portion of a transmission gear.
[0005]
[Means for Solving the Problems]
The lubrication structure of the transmission according to the present invention, which was created to achieve the above object, includes a main shaft, a sub shaft, and a transmission gear provided on the outer periphery of the main shaft or the sub shaft so as to be relatively rotatable. In the lubricating structure of the transmission housing the transmission, contact between the transmission gear and the flange of the main shaft or the countershaft on the side wall or the partition wall of the transmission case and the lubricating oil falling along the side wall or the partition wall close to the side wall or the partition wall Protrusions for supplying drops to a thrust portion formed by a surface are provided. The protrusions protrude from the side wall or partition wall of the transmission case toward the thrust portion, and a protrusion surface for collecting the lubricating oil protrudes. is formed on the pointed over earlier end from the base end in the direction, the position of the inner end of the protruding portion in the radial direction of the main shaft or the auxiliary shaft, is to shall and the tip.
[0006]
According to this, the lubricating oil falling along the side wall or the partition wall of the transmission case can be effectively supplied to the thrust portion of the transmission gear.
[0007]
The transmission gear close to the side wall or partition wall of the transmission case is preferably a reverse gear provided on the outer periphery of the main shaft so as to be relatively rotatable. In this way, the lubricating oil can be effectively supplied to the thrust portion of the reverse gear that is likely to be insufficiently lubricated.
[0008]
Further, the projection section issues collision within formed in the radial direction intermediate portion of the transmission gear recessed portions, it is preferable that the tip portion is positioned in a generally vertical line of thrust of the gear. In this way, the space can be effectively used, and the lubricating oil can be reliably supplied to the thrust portion of the transmission gear.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
FIG. 1 is a skeleton of a transmission, FIG. 2 is a sectional view showing a lubricating structure of a transmission according to a reference embodiment, and FIG. 3 is a sectional view of a protrusion in FIG.
[0011]
First, the outline of the transmission will be described with reference to FIG.
[0012]
As shown in the figure, the transmission 10 includes an input shaft 11, a main shaft 12 arranged coaxially with the input shaft 11, and a sub shaft 13 arranged parallel to the input shaft 11 and the main shaft 12. The main shaft 12, the sub shaft 13, and a plurality of transmission gears are accommodated in the transmission case 14.
[0013]
The mission case 14 is partitioned into a main chamber 15 and a sub chamber 16 by a partition wall 14a.
[0014]
The input shaft 11 is inserted into the main chamber 15 of the mission case 14 and is provided with an input gear 17 that also serves as a 5-speed main gear. A spline 18 is fixed on the right side of the input gear 17.
[0015]
The auxiliary shaft 13 extends from the main chamber 15 to the auxiliary chamber 16, and in the main chamber 15, an input counter gear 19 that meshes with the input gear 17 of the input shaft 11, a 4-speed counter gear 20, and a 3-speed counter. A gear 21, a second speed counter gear 22, a first speed counter gear 23, and a reverse counter gear 24 are fixedly provided.
[0016]
In the sub chamber 16, a 6-speed counter gear 25 is provided on the outer periphery of the sub-shaft 13 so as not to be axially movable relative to the sub-shaft 13 and to be relatively rotatable. Is provided with a spline 26. Further, a spline 27 is fixed to the end of the auxiliary shaft 13, and a sleeve capable of engaging and connecting the spline 26 of the 6-speed counter gear 25 and the spline 27 by moving in the axial direction. 28 is provided.
[0017]
The main shaft 12 extends from the main chamber 15 through the sub chamber 16 to the outside of the transmission case 14, and in the main chamber 15, the outer periphery of the main shaft 12 has a four-speed counter gear 20 and a three-speed counter on the sub shaft 13. The gear 21, the second gear counter gear 22 and the first gear counter gear 23 mesh with the fourth gear main gear 30, the third gear main gear 31, the second gear main gear 32 and the first gear main gear 33, and the reverse counter gear 24 via the idle gear 29, respectively. The meshing reverse main gear 34 is provided so as not to be relatively movable in the axial direction with respect to the main shaft 12 and to be relatively rotatable.
[0018]
The spline 40 is on the left side of the 4-speed main gear 30, the spline 41 is on the right side of the 3-speed main gear 31, the spline 42 is on the left side of the 2-speed main gear 32, the spline 43 is on the right side of the 1-speed main gear 33, and the reverse main gear. A spline 44 is fixed on the left side of 34.
[0019]
Further, the main shaft 12 has a spline 45 fixedly positioned between the splines 18 and 40, a spline 46 fixedly positioned between the splines 41 and 42, and positioned between the splines 43 and 44. The spline 47 is fixed.
[0020]
The spline 45 is provided with a sleeve 48 that moves in the axial direction and is capable of engaging and connecting adjacent splines 18, 45 (40, 45). The spline 46 includes splines 41, 46 (42, 46). And a spline 47 is provided with a sleeve 50 capable of engaging and connecting the splines 43 and 47 (44, 47).
[0021]
Further, in the sub chamber 16, a 6-speed main gear 51 that meshes with the 6-speed counter gear 25 of the sub shaft 13 is fixed to the main shaft 12.
[0022]
Attached to each of the sleeves 28, 48, 49, 50 is an ordinary synchronizing mechanism (not shown).
[0023]
Further, a shift fork (not shown) is engaged with each of the sleeves 28, 48, 49, 50, and is appropriately moved in the axial direction by a manual type or a gear shift unit. For example, as shown in FIG. 1, when the sleeves 28, 48, 49, 50 are positioned on the splines 27, 45, 46, 47, the gear neutral state is established, and the main gears 40 to 44 are idle on the main shaft 12. Only to do.
[0024]
When the sleeve 50 is moved onto the splines 43 and 47, the main shaft 12 is integrated with the first-speed main gear 33 and rotates at the forward first speed. Similarly, when the sleeve 49 is moved onto the splines 42 and 46, the second forward speed is obtained, and when the sleeve 49 is moved onto the splines 46 and 41, the third forward speed is obtained, and the sleeve 48 is moved onto the splines 45 and 40. When the sleeve 48 is moved onto the splines 27 and 26, the forward speed is 6th, and when the sleeve 28 is moved onto the splines 27 and 26, the forward speed is 6th. It rotates at a speed equivalent to 6th speed.
[0025]
Further, when the sleeve 50 is moved onto the splines 47 and 44, the main shaft 12 rotates in the reverse direction.
[0026]
In the transmission case 14, lubricating oil 52 for lubricating each transmission gear, sleeve, and the like is stored, and when each gear is stationary, an oil surface 52a indicated by a one-dot chain line is formed. The oil level 52a is inclined because the transmission 10 is vertically placed on the vehicle and is inclined so that the engine E side becomes higher.
[0027]
As shown in FIG. 1, the oil surface 52 a has a height up to the vicinity of the center of the auxiliary shaft 13, and the lubricating oil 52 is scraped up by the counter gears 19 to 25, so that the upper main gears 30 to 34 and the splines 40 are raised. Lubricate ~ 47 etc. Thereafter, the lubricating oil 52 is scattered by the main gears 30 to 34 and the like, and falls along the side wall of the mission case 14 or the partition wall 14a.
[0028]
Here, the lubrication structure of the reference embodiment is configured such that the lubricating oil 52 that falls through the partition wall 14a of the transmission case 14 is supplied dropwise to the thrust portion of the reverse main gear 34 adjacent to the partition wall 14a. And the structure is demonstrated using FIG.
[0029]
As shown in FIG. 2, the reverse gear 34 is rotatably provided on the outer periphery of the main shaft 13 via a needle bearing 53. The reverse gear 34 is restricted from moving in the axial direction by a flange 54 provided on the main shaft 13. A thrust force is generated on the contact surface between the reverse gear 34 and the flange portion 54, that is, the thrust portion 59.
[0030]
The main shaft 13 is rotatably supported by the partition wall 14 a of the transmission case 14 via a roller bearing 56 positioned and arranged by a spacer 55.
[0031]
The roller bearing 56 is fixed to the partition wall 14 a by a bolt 59 via a ring 57 and a pressing member 58.
[0032]
A protrusion 60 is formed on the left side of the partition wall 14a for supplying the lubricating oil dropwise to the thrust portion 59 of the reverse gear 34. The protrusion 60 is formed integrally with the partition wall 14a, protrudes from the partition wall 14a into a lightening portion 61 formed at the radial intermediate portion of the reverse gear 34, and its tip is substantially perpendicular to the thrust portion 59 of the reverse gear 34. Is located.
[0033]
As shown in FIG. 3, the protrusion 60 is formed in a bowl shape that is curved in a substantially U shape, and the lubricating oil 52 that falls along the partition wall 14a can be stored therein.
[0034]
According to such a lubrication structure, the lubricating oil 52 that falls through the partition wall 14a is collected in the protrusion 60 and supplied dropwise to the thrust portion 59 of the reverse gear 34 from the tip. For this reason, the lubricating oil 52 falling along the partition wall 14a can be effectively supplied to the thrust portion 59, and insufficient lubrication can be prevented.
[0035]
Further, since the reverse main gear 34 rotates relative to the main shaft 12 in the reverse direction when the vehicle moves forward, the relative speed becomes very large when the engine speed increases or when the vehicle speed increases. However, in the reference embodiment shown in FIGS. 2 and 3 , the reverse main gear 34 is provided close to the partition wall 14a and the lubricating oil 52 is supplied to the thrust portion 59, so that the lubrication is insufficient. Can be prevented. However, the present invention is not limited in this respect, and the lubricating oil may be supplied to the thrust portion of another transmission gear. For example, the first-speed main gear 33 may be provided close to the partition wall 14a, and the lubricating oil may be supplied to the thrust portion. In FIG. Lubricating oil may be supplied to the thrust portion of the 6-speed counter gear 25 provided on the outer periphery of the 6-speed counter gear 25.
[0036]
Further, since the protruding portion 60 protrudes into the cutout portion 61, the axial space can be reduced, and the overlap tip portion is positioned substantially on the vertical line of the thrust portion 59, so that the thrust portion 59 is reliably lubricated. Oil can be dripped. In FIG. 2, if the tip of the protrusion 60 is positioned on the left side of the thrust part 59, the lubricating oil 52 falls on the boss part 62 of the reverse gear 34 and scatters due to centrifugal force. There is a possibility that it cannot be supplied. On the other hand, in the reference embodiment shown in FIGS. 2 and 3 , the lubricating oil 52 can be reliably supplied to the thrust portion 59 without scattering.
[0037]
Here, the shape of the protrusion 60 is not limited to a bowl shape curved in a U-shape, and as in other reference forms shown in FIGS. 4A and 4B, a V-shaped bowl shape 63 or a U-shape. It is good also as the bowl-like 64. In the embodiments of the present invention, as shown in FIG. 5, Ru provided cusp-shaped projection 65. By doing so, the lubricating oil falling on the partition wall 14 a is transmitted to the tip portion 66 through the protrusion 65, and can be supplied dropwise from the tip portion 66 to the thrust portion 59.
[0038]
Also, have been described collision raised portion 60 as formed in the partition wall 14a of the transmission case 14, the present invention is not limited in this respect, for example, by forming a protrusion 60 on the front and rear left and right side walls of the transmission case 14 Is also good.
[0039]
【The invention's effect】
In short, according to the present invention, excellent effects are exhibited as described below.
(1) Lubricating oil can be effectively supplied to the thrust portion of the transmission gear, and insufficient lubrication can be prevented.
(2) The thrust part of the reverse gear with severe lubrication conditions can be lubricated.
[Brief description of the drawings]
FIG. 1 is a skeleton of a transmission.
FIG. 2 is a cross-sectional view showing a lubricating structure of a transmission according to a reference embodiment.
FIG. 3 is a cross-sectional view of a protrusion in FIG.
It is a sectional view showing a protrusion in FIG. 4 (a) lubricating structure according to another reference embodiment.
(B) It is sectional drawing which shows the projection part in the lubricating structure which concerns on another reference form .
It is a front view showing a protrusion in the lubricating structure according to an embodiment of FIG. 5 (a) the present invention.
(B) It is sectional drawing which shows the projection part in the lubrication structure which concerns on one Embodiment of this invention .
[Explanation of symbols]
12 Main shaft 13 Sub shaft 14 Transmission case 34 Transmission gear 59 Thrust portion 6 5 Protrusion (protrusion)

Claims (3)

In a transmission lubrication structure in which a main shaft, a sub shaft, and a transmission gear provided on the outer periphery of the main shaft or the sub shaft so as to be relatively rotatable are accommodated in the transmission case, a side wall or a partition wall Providing a projecting portion for dropping and supplying lubricating oil falling along the partition wall to a thrust portion formed by a contact surface between the transmission gear near the side wall or the partition wall and the flange portion of the main shaft or the sub shaft,
The protrusion protrudes toward the thrust portion from the side wall or the partition wall of the transmission case, and projection surface to collect the lubricating oil is formed in the pointed over earlier end from the base end in the protruding direction,
Lubrication structure of a transmission, characterized in that the position of the inner end of the protruding portion in the radial direction of the main shaft or the auxiliary shaft shall be the above tip.   The lubricating structure for a transmission according to claim 1, wherein the transmission gear adjacent to the side wall or partition wall of the transmission case is a reverse gear provided on the outer periphery of the main shaft so as to be relatively rotatable.   The lubricating structure for a transmission according to claim 1 or 2, wherein the protrusion protrudes into a hollow portion formed at a radial intermediate portion of the transmission gear, and a tip portion thereof is positioned substantially on a vertical line of a thrust portion of the transmission gear. .

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