JP4576695B2 - Transmission lubrication structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubricating structure for an automobile transmission.
[0002]
[Prior art]
As shown in FIG. 3, the counter shaft gear 51 provided integrally with the counter shaft 50 meshes with the main gear 16 that is rotatably supported by the main shaft 4, and transmits the rotation of the counter shaft 50 to the main gear 16. It has become.
[0003]
The main shaft 4 is provided with a synchronization device 20 for connecting the main gear 16 to the main shaft 4 while synchronizing.
[0004]
In a mission case (not shown) that pivotally supports the counter shaft 50 and the main shaft 4, lubricating oil for supplying to the synchronizer 20 and the like is accumulated, and the oil level 52 is almost the height of the counter shaft 50. Is located.
[0005]
Then, the countershaft 50 is rotated, and a plurality of counter gears (not shown) provided integrally with the countershaft are rotated, so that the lubricating oil is lifted up above the synchronizing device 20 and the lubricating oil is put into the transmission case. It is circulated and supplied to the synchronization device 20 or the like.
[0006]
[Problems to be solved by the invention]
Incidentally, the countershaft gear 51 generally used for low speed is formed in a small diameter so as to transmit the rotation from the engine (not shown) to the main shaft 4 at a predetermined rotation ratio.
[0007]
For this reason, unlike other counter gears (not shown) having a large diameter, the lubricating oil cannot be lifted up above the synchronizing device 20, and the lubricating oil is supplied to the synchronizing device 20 close to the counter shaft gear 51. It was very difficult.
[0008]
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 easily supply lubricating oil to a synchronizer close to a countershaft gear.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a counter case having a countershaft and a main shaft that are parallel to each other and pivoted with the countershaft on the lower side, and a counter with a diameter larger than that of the countershaft. In the lubrication structure of the transmission, the countershaft gear is provided in a transmission structure in which a shaft gear is provided and the countershaft gear is rotated to lift up the lubricating oil accumulated in the transmission case and to supply to the synchronizer provided in the main shaft. An axial end of the top of each tooth is formed at a position radially outward of the synchronizer, and a corner is formed on the end to blow lubricating oil, and radially inward from the top. valleys of the teeth of the countershaft gear to be formed, has a periphery from a predetermined radially inward depth of the counter shaft Together is done, the other end of the trough is formed at a position outward than the other end and the top of the valley that will be formed at the position of the outward from one end of the top portion in the axial direction And the depth of the trough is reduced from one end and the other end of the top in the axial direction to one end and the other end of the trough that are outward .
[0010]
Lubricating oil splashes easily from the corners, and the lubricating oil can be easily supplied to the synchronizer close to the countershaft gear.
[0011]
Further, the synchronization device includes a dog clutch provided on the synchronized side, and a block ring for contacting the dog clutch and transmitting the rotation of the dog clutch to the synchronization side, and the countershaft gear includes the block ring and It is preferable that the corner portion is positioned outside the gap formed between the dog clutches or radially outward of the block ring. Lubricating oil can be easily supplied to the inside of the synchronizer along the block ring.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
As shown in FIG. 2, the transmission 1 is connected to a transmission case 2 that forms an outer shell and a drive device (not shown) such as a diesel engine via a clutch (not shown). The input shaft 3 is pivotally supported by inserting one end thereof, and the main shaft 4 is disposed coaxially with the input shaft 3 and is pivotally supported with one end abutting the input shaft 3 and the other end extending from the transmission case 2. And a countershaft 5 which is arranged in parallel vertically below these shafts 3 and 4 and whose both ends are pivotally supported by the transmission case 2.
[0014]
An input gear 6 accommodated in the mission case 2 is integrally provided on the input shaft 3.
[0015]
The counter shaft 5 includes an input counter gear 7 that meshes with the input gear 6, a 4-speed counter gear 8, a 3-speed counter gear 9, a 2-speed counter gear 10, a 1-speed counter gear 11, and a reverse counter gear. 12 are provided integrally with each other.
[0016]
The main shaft 4 includes a 4-speed main gear 13 that meshes with the 4-speed counter gear 8, a 3-speed main gear 14 that meshes with the 3-speed counter gear 9, and a 2-speed main gear 15 that meshes with the 2-speed counter gear 10. A first-speed main gear 16 that meshes with the first-speed counter gear 11 and a reverse main gear 18 that meshes with the reverse counter gear 12 via a reverse idle gear 17 are sequentially rotatably supported.
The main gears 13, 14, 15, 16, 18 are rotated together with the counter gears 8, 9, 10, 11, 12 that mesh with each other.
[0017]
The main shaft 4 is provided with a plurality of synchronizers 19 and 20 corresponding to the main gears 13, 14, 15, 16 and 18.
[0018]
As shown in FIG. 1, the synchronizer 20 provided close to the first-speed counter gear 11 as a low-speed counter gear is a triple cone type.
[0019]
Specifically, the synchronization device 20 includes a clutch hub 21 that is integrally provided on the main shaft 4, a coupling sleeve 22 that is spline-engaged on the outer periphery of the clutch hub 21 so as to be axially slidable, and a clutch hub 21. A block ring 24 provided near the side surface 49 and having a synchro cone surface portion 23 on the inner periphery, an intermediate ring 25 provided on the inner periphery side of the block ring 24, and an inner periphery side of the intermediate ring 25. An inner ring 26 and a spline 30 that is provided integrally with the gears 16 and 18 on the synchronized side with the synchro cone surface portion 27 protruding from the inner peripheral side of the inner ring 26 and that is engaged with the coupling sleeve 22 on the outer periphery. And dog clutches 31 and 32.
[0020]
The intermediate ring 25 and the inside ring 26 have synchro cone surface portions 33, 34, 35, and 36 on the inner periphery and the outer periphery, respectively.
[0021]
The intermediate ring 25 is restricted from moving in the circumferential direction by the dog clutches 31, 32, and the inside ring 26 is engaged in the window 37 of the clutch hub 21 to restrict movement in the circumferential direction.
[0022]
Further, the lubricating oil is accumulated in the mission case 2 with the oil surface 52 positioned substantially at the height of the countershaft 5.
[0023]
The first-speed counter gear 11 is a countershaft gear that is formed to have a slightly larger diameter than the countershaft 5, and the top 39 of the tooth 38 protrudes from the outer periphery of the countershaft 5, and the valley 40 of the tooth 38 is formed on the countershaft 5. It is formed by cutting in.
[0024]
The first-speed counter gear 11 is configured such that both end portions 41 and 42 in the axial direction protrude from the outer periphery of the counter shaft 5 in a stepped manner.
[0025]
The first-speed counter gear 11 has one end portion 42 positioned on the synchronization device 20 side of the two end portions 41 and 42, and a diameter of a gap formed between the block ring 24 and the dog clutch 31 of the synchronization device 20. The counter shaft 5 is provided so as to be positioned outward in the direction. The end portion 42 is formed with a corner portion 43 for cutting oil.
[0026]
The trough 40 of the first-speed counter gear 11 is formed to extend slightly from both ends of the first-speed counter gear 11 in the axial direction. To collect the lubricant.
[0027]
Next, the operation will be described.
[0028]
The rotational driving force of the input shaft 3 is transmitted to the input counter gear 7 via the input gear 6 and rotates the counter shaft 5.
[0029]
The counter gears 8, 9, 10, 11, and 12 rotate with the counter shaft 5, and the rotation of the counter gears 8, 9, 10, 11, and 12 is caused by the main gears 13, 14, 15, 16, and 18 that mesh with each other. Communicated. The main gears 13, 14, 15, 16, and 18 rotate on the main shaft 4 at a rotation speed corresponding to the gear ratio with the counter gear.
[0030]
When the first-speed counter gear 11 is rotated, the lubricating oil is swept up by the teeth 38 of the first-speed counter gear 11 and the troughs 40 extending in the axial direction from the first-speed counter gear 11. It flies from the outer periphery of the counter gear 11 toward the tangential direction of the periphery.
[0031]
At this time, since the peripheral speed of the countershaft 5 is slow, the lubricating oil does not fly so much from the trough portion 40, and the lubricating oil in the trough portion 40 tends to flow toward the teeth 38 that extend radially outward. To do. For this reason, a sufficient amount of lubricating oil can be included in the countershaft 5, and a sufficient amount of lubricating oil can be blown over a wide range.
[0032]
Further, the amount of lubricating oil flying from the top portion 39 of the tooth 38 is uneven depending on the position of the top portion 39.
[0033]
Corner portions 43 that are more oil-dissipated than the ridgelines of the teeth 38 are formed at both ends in the axial direction of the top portion 39, and more splashes of lubricating oil are blown out than the intermediate position of the top portion 39.
[0034]
When the lubricating oil flies from the ridgeline of the tooth 38, the lubricating oil flies by forming a relatively large drop while clinging to the tooth 38, but the oil is well cut off at the corner 43 of the end 42. Oil drops fly earlier than on the ridgeline.
[0035]
When the lubricating oil flies, the lubricating oil accumulated on the nearby ridgeline moves and the amount of lubricating oil on the ridgeline and the corner portion 43 is balanced, so that the corner portion 43 always has a drop of lubricating oil. Is easy to fly, and more splashes will be blown.
[0036]
Furthermore, since the lubricating oil easily flows into the corner portion 43 from the valley portion 40 extending from the first-speed counter gear 11, there is no shortage of lubricating oil to be blown off at the end portion 42, and a large amount of lubricating oil continuously. Can be skipped.
[0037]
The splashes of lubricating oil that have been blown from the outer periphery of the end portion 42 in the circumferential tangential direction are within the gap formed between the block ring 24 and the dog clutch 31 of the synchronization device 20 at the radially outward position of the end portion 42. And hits the synchro cone surface portion of the intermediate ring 25.
[0038]
Then, the lubricating oil lubricates the synchro cone surface portions 27, 33, 34, 35 and 36 including the synchro cone surface portion 23 formed on the inner periphery of the block ring 24 through the intermediate ring 25.
[0039]
Thus, the first speed counter gear 11 is formed to extend to a position radially outward of the synchronizer 20, and the end portion 42 having the corner portion 43 for allowing the lubricating oil to flow is formed at that position. Lubricating oil can be easily supplied to the synchronization device 20 adjacent to the counter gear 11.
[0040]
Further, since the corner portion 43 of the first-speed counter gear 11 is positioned radially outward of the gap formed between the block ring 24 and the dog clutch 31, the lubricating oil can be easily supplied to the inside of the synchronization device 20. In particular, the lubricating oil can be quickly and sufficiently supplied to the synchro cone surface portions 23, 27, 33, 34, 35, and 36 that require the lubricating oil.
[0041]
In the present embodiment, the end 42 of the first speed counter gear 11 is positioned radially outward of the block ring 24. However, the present invention is not limited to this. While forming beyond the position outside in the direction, a corner (not shown) for splashing the lubricating oil may be formed at a position radially outward of the synchronization device 20.
[0042]
In addition, one end 42 of the first-speed counter gear 11 is positioned radially outward of the gap formed between the block ring 24 and the dog clutch 31 of the synchronization device 20, but the end 42 is blocked. The ring 24 may be positioned radially outward.
Since the lubricating oil flows through the block ring 24, the lubricating oil can be supplied to the inside of the synchronization device 20.
[0043]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be obtained.
(1) Lubricating oil can be easily supplied to the synchronizer close to the low-speed counter gear.
[Brief description of the drawings]
FIG. 1 is an enlarged view of a main part of a transmission showing a preferred embodiment of the present invention.
FIG. 2 is a schematic explanatory diagram of a transmission.
FIG. 3 is an enlarged view of a main part of a conventional transmission.
[Explanation of symbols]
1 Transmission 2 Mission Case 4 Main Shaft 5 Counter Shaft 11 Counter Shaft Gear 20 Synchronizer 24 Block Ring 31 Dog Clutch 43 Corner

Claims (2)

In the transmission case, the counter shaft and the main shaft are parallel and pivotally supported with the counter shaft facing down, and a counter shaft gear having a larger diameter than the counter shaft is provided on the counter shaft, and the counter shaft gear is rotated. In the lubricating structure of the transmission, the lubricating oil accumulated in the transmission case is lifted and supplied to the synchronizing device provided on the main shaft. The counter shaft gear is formed at a position radially outward of the synchronizer, and at the end thereof is formed with a corner for splashing the lubricating oil. parts are, while being formed with an outer circumference from a predetermined radially inward depth of the counter shaft, above in the axial direction And a second end of the trough than the other end and the top of the valley that will be formed at a position outward is formed at a position outward than an end of the top portion, in the axial direction A lubrication structure for a transmission, characterized in that the depth of the trough is reduced from one end and the other end of the top to one end and the other end of the trough on the outside .   The synchronization device includes a dog clutch provided on the synchronized side, and a block ring for contacting the dog clutch to transmit the rotation of the dog clutch to the synchronization side, and the countershaft gear includes the block ring and the dog clutch. The lubrication structure for a transmission according to claim 1, wherein a corner portion is positioned in a gap formed between them or radially outward of the block ring.

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