JPH0942425A - Mechanical transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce pump loss by reducing forcibly supplying lubricating oil to the necessary minimum quantity and improving lubrication of a gear, a synchromesh, a bearing, etc. SOLUTION: A second and third shift fork shaft 15 is furnished with an oil hole 19 extended in the lengthy direction and a plural number of oil through holes 20, 21 opened to an outer peripheral surface at a specified position and communicated through to the oil hole 19 inside and leads lubricating oil from an oil pump to the oil hole 19. Additionally, a second and third shift fork 16 is supported by the shift fork shaft 15 on a shifter head 24 free to slide, and it is furnished with a plural number of oil spraying holes 26, 27 drilled on the shifter head 24 at a specified position communicated through to their corresponding oil through holes 20, 21 at a shift position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical transmission mounted on an automobile, and more particularly to a mechanical transmission in which a transmission gear is forcibly lubricated.

[0002]

2. Description of the Related Art In recent mechanical transmissions of this type, there is a tendency to employ a forced lubrication method in which oil, gears, synchromesh, bearings and the like are supplied with oil. This forced lubrication method provides sufficient lubrication compared to the scraping lubrication method that uses an oil garter, but since lubrication is always forced there, the amount of lubricating oil becomes unnecessarily large. Pump loss increases, and the power generated by the engine is wasted.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to mechanically reduce the amount of lubricating oil forcibly supplied to a required amount to improve lubrication of gears, synchromesh, bearings, etc., and reduce pump loss.・ Providing a transmission.

[0004]

Means corresponding to the object and the operation thereof
The second-and-third-shift fork shaft has an oil feed hole that extends in the lengthwise direction inside and a plurality of oil feed holes that are opened in the outer peripheral surface at predetermined positions and communicate with the oil feed holes. Guide the lubricating oil from the oil pump to its oil feed hole, and then the second and third
A shift fork is slidably supported by the shifter head on its shift fork shaft and is pierced in its shifter head at a predetermined position that communicates with its corresponding oil passage in the shift position. A plurality of oil holes are provided, and one of the plurality of oil holes corresponds to one of the plurality of oil holes according to the shift operation in the shift operation for shifting to the second speed or the third speed. Lubricating oil is supplied to either one of a second gear and a third gear, which are in fluid communication with one another and are supported on the output shaft so as to idle, and the other one of the plurality of oil spray holes is Lubricating oil is supplied to a synchronizing mesh which is connected to another corresponding one of the plurality of oil passage holes and is assembled on the output shaft in response to the shift operation. As such, in the present invention, the second speed or the third speed
When a high speed shift operation is performed, lubricating oil is supplied to the synchromesh mesh and one of the second gear and the third gear meshed with the synchromesh mesh, and the second gear and the second gear that idle. Lubricant supply to either the third gear or the other is omitted.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the mechanical transmission of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment 10 of the mechanical transmission of the present invention applied to a heavy truck. This mechanical transmission 10 is embodied so as to be capable of shifting from 7 forward speeds to 1 reverse speed, and includes a clutch shaft (not shown), an output
Shaft 11 and counter shaft (not shown)
Are placed in a gear case (not shown) and an auxiliary case (not shown),
Gear (not shown), Second Speed Gear 12, Third Speed Gear 13, Force Speed Gear (not shown), Fifth Speed Gear (Clutch
Gear, not shown), and reverse gear (not shown)
Has its output shaft 1 in its gear case
1, and a Six Speed Gear (not shown) and a Seventh Speed Gear (not shown) fixedly mounted on the Output Shaft 11 in the auxiliary case. Supported, while
First counter gear (not shown), second counter gear (not shown), third counter gear (not shown), force counter gear (not shown), and counter shaft driven gear (not shown). Fixedly supported on its counter shaft in its gear case, its first speed gear, second
Speed Gear 12, Third Speed Gear 13, Force Speed Gear, and Fifth Speed
The gears are engaged and meshed, and the reverse
An idler gear (not shown) is fixedly supported in the gear case on a reverse idler shaft (not shown) and meshed with the first counter gear and the reverse gear. A counter gear (not shown) and a 7th counter gear (not shown) are idly supported on the counter shaft in the auxiliary case and correspond to the 6th speed gear and the 7th speed gear. It is engaged.

The mechanical transmission 10 also includes a constant mesh (not shown), a second and third synchromesh 14, a force and fifth synchromesh (not shown), and a six and six. A Seventh Synchromesh (not shown) is normally used to enable speed changes quickly and easily. Of course, the constant mesh is between the reverse gear and the first speed gear, and the second and third synchromesh 14 is between the second speed gear 12 and the third speed gear 13. Between, and the Force and Fifth Synchromesh is assembled on the output shaft 11 between the Force speed gear and the clutch gear, respectively, and the Six and The Seventh Speed Synchromesh is mounted on its counter shaft between its Six Counter Gear and its Seventh Counter Gear.

The constant mesh, the second
And Third Synchromesh 14, Force And Fifth Synchromesh, And Six
The And Seventh Synchromesh includes a reverse and first shift fork (not shown), a second and third shift fork 16, a force and fifth shift fork (not shown), and It is correspondingly operated with a Six and Seventh shift fork (not shown). Of course, the reverse and first shift forks, the second and third shift forks 16, the fourth and fifth shift forks, and the six and seventh shift forks are also usually Reverse and first shift fork shaft (not shown), second and third shift fork shaft 15, force and fifth shift fork shaft (not shown), and six It is slidably supported corresponding to an And Seventh shift fork shaft (not shown).

Further, in the mechanical transmission 10, the lubricating oil is speed-changed according to the shift operation.
Forced supply to gears and synchromesh. The forced lubrication will be specifically described in the second speed and the third speed. At the second speed and the third speed, the second and third shift fork shaft 15 has an oil feeding hole 19 extending in the longitudinal direction inward and an opening on the outer peripheral surface at a predetermined position. And a plurality of oil passage holes 20, 21 and 22 which are communicated with the oil feed hole 19 and are connected to the oil feed hole 1 from an oil pump (not shown).
9 introduces lubricating oil, and its second and third shift fork 16 is slidably supported on the second and third shift fork shaft 15 by a shifter head 24, and The corresponding oil passage holes 20 at the shift positions of the second speed and the third speed,
A plurality of fuel oil holes 26, 27 drilled in the shifter head 24 at predetermined positions communicating with the 21, 22
28, and in the shift operation for shifting to the second speed or the third speed, the plurality of oil holes 26, 2
The second one of which is connected to the corresponding one of the plurality of oil passage holes 20, 21, and 22 in response to the shift operation and is supported on the output shaft 11 so as to be idle. Supplying lubricating oil to either one of the speed gear 12 and the third speed gear 13,
Further, the other one of the plurality of oil injection holes 26, 27, 28 corresponds to the plurality of oil passage holes 20, 21,
Lubricating oil is supplied to the second and third synchromesh 14 which is in communication with the corresponding other one of the 22 and is mounted on the output shaft 11.

The second and third shift
As the fork shaft 15, a solid metal round bar having a predetermined length is used. First, the oil feed hole 19 is opened at one end of the solid metal round bar, and then the oil hole 19 is longitudinally extended and drilled inside the solid metal round bar. The oil passage holes 20, 21, 22 are opened on the outer peripheral surface of the solid metal rod at predetermined positions thereof, that is, at positions corresponding to the shift positions of the second speed and the third speed,
Then, it is communicated with the oil supply hole 19 to form a hole, and a threaded portion (not shown) is further threaded on the outer peripheral surface of one end of the solid metal round bar, that is, the outer peripheral surface of the open end. Finished on the second and third shift fork shaft 15.

The second-and-third-shift fork shaft 15, which has been subjected to such processing and finishing, is arranged on the upper cover 32 at a predetermined position, and is connected to the threaded portion of the connector 23. One end of the oil supply pipe 31 is connected to the opening end, and the other end of the oil supply pipe 31 is screw-connected to the discharge port of the oil pump to allow the oil pump to supply the oil supply hole 1
Guide the lubricating oil to 9.

The second and third shift
The fork 16 has a journal bore 25 drilled in its shifter head 24.
The bore 25 is fitted to the second and third shift fork shaft 15 and is slidably supported by the shift fork shaft 15 by the shifter head 24. Also, the shifter head 24 has
The plurality of oil spray holes 26, 27, 28 are shown in FIG. 1 and FIG.
As shown in FIG. 5, the gears are drilled at predetermined positions which communicate with the corresponding oil passage holes 20, 21, 22 at the shift positions of the second speed and the third speed. Of course, the shifter head 24 normally has a pair of corners 29, 29 protruding from the head top at a predetermined interval, and the corners 29, 29 are projected.
It is possible to fit the tip of the shift and select lever 30 between the two. That is, the shifter head 24 is slid on the shift fork shaft 15 by the shift and select lever 30 so that the second and third shift fork 16 moves to the second speed and The second and third synchromesh 14 is moved to the shift position of the third speed to effect the synchronous engagement.

The second and third synchromesh 14 is a clutch hub 17 splined onto the output shaft 11 between the second speed gear 12 and the third speed gear 13. , A shifter sleeve 18 movably assembled on the clutch hub 17, an inner cone, a double cone, a synchro ring and the like. In the second and third synchromesh 14, the shifter sleeve 18 is moved by the second and third shift fork 16 onto the clutch hub 17, and the second speed gear 12 and Third speed
Selectively meshed with the gear spline of gear 13 and from its second and third counter gears to its second speed gear 12
And the power is selectively transmitted to the third speed gear 13. As such, the second and third synchromesh 14 is operated by the second and third shift fork 16 to effect its second and third speed shifting.

Next, in the mechanical transmission 10, the second speed gear 12,
The forced lubrication performed on the third speed gear 13 and the second and third synchromesh 14 will be described. Now, when the shift lever is operated to shift the third speed, the second-and-third shift synchromesh 14 causes the second-and-third shift fork 16 to shift the shifter.
The sleeve 18 is moved to the left from the neutral state of FIG.
When the shifter sleeve 18 begins to move to the left,
Since the oil injection hole 28 is started to be aligned with the oil passage hole 22 in FIG.
The lubricating oil guided to 9 replenishes the second and third synchromesh 14 through the oil spray hole 28. At that time, the inner cone, the double cone and the synchronizing ring are synchronized, and the shifter sleeve 18 is further moved to the left side, and
The gear is engaged with the gear spline of the third speed gear 13 to shift to the third speed, and power is transmitted between the third counter gear and the third speed gear 13.

As described above, when the shifter sleeve 18 is moved to the shift position of the third speed, the oil spray hole 27 is aligned with the oil flow hole 21 in FIG. Hole 27 through its third speed gear 1
Lubricates its third speed gear 13 and its bushes by being jetted at 3.

Subsequently, when the shift lever is operated to shift to the second speed, the second-and-third synchromesh 14 causes the second-and-third shift fork 16 to shift the shifter. The sleeve 18 is moved to the right from its third gear shift position, and synchronization is effected on its shifter
The sleeve 18 is moved further to the right, and meshed with the gear spline of the second speed gear 12 to shift to the second speed, and the second counter gear and the second speed gear 1 are engaged.
Power is transmitted between the two.

When the shifter sleeve 18 is moved to the second speed shift position, the oil spray hole 26 is aligned with the oil passage hole 20 in FIG. It is jetted to the second speed gear 12 to lubricate the second speed gear 12 and its bush.

In the above-mentioned forced lubrication, when gear shifting is performed, the lubricating oil is supplied to the gears to be meshed with each other and the synchromesh to be meshed with each other. Sometimes it is jetted and supplied, so that the lubricating oil is reduced to the minimum required amount and sufficient oil supply is possible.
The pump capacity can be minimized and pump loss reduced,
As a result, wasteful consumption of power generated by the engine is avoided.

Further, in the mechanical transmission 10, the second and third shift
Although the fork shaft 15 was described as being made from a solid metal round bar, the second and third shift fork shaft 15 has a metal pipe that plugs one end into the oil passage hole. 20, 21, 2
2 may be punched.

As will be apparent from the specific embodiments of the present invention described above with reference to the drawings, one skilled in the art to which the present invention pertains will appreciate the subject matter of the present invention. Is the nature of the invention (na
), and are readily embodied in other aspects that are objectively perceived as inherent in them. Of course, the content of the present invention corresponds to the subject of the invention (be commensu).
rate with) and essential for the invention.

[0020]

Benefits of the Invention As will be understood from the above, the mechanical transmission of the present invention has a second and third shift fork shaft having an oil feed hole extending longitudinally therein and a predetermined oil feed hole. A plurality of oil passage holes that are opened to the outer peripheral surface at the position and communicate with the oil feed hole, and guide the lubricating oil from the oil pump to the oil feed hole,
Then, the second and third shift fork is slidably supported on the shift fork shaft by the shifter head, and at a predetermined position where it is communicated with its corresponding oil passage hole at the shift position. The shifter head is equipped with multiple holes for spraying oil, and
On the output shaft, one of the plurality of oil holes is connected to a corresponding one of the plurality of oil holes according to the shift operation in the shift operation for shifting to the second speed or the third speed. The lubricating oil is supplied to either one of the second speed gear and the third speed gear that are supported so as to idle, and the other one of the plurality of oil spray holes corresponds to the plurality of oil spray holes depending on the shift operation. In the mechanical transmission of the present invention, the minimum amount of lubricating oil is required because the lubricating oil is supplied to the synchromesh that is connected to the other corresponding one of the oil passage holes of the above and is assembled on the output shaft. To allow for forced lubrication, and improved lubrication of gears, synchromesh, and bearings, and minimal oil pump capacity Can pump loss is reduced, is avoided that power generated by the engine is wasted along with it, the result is a very useful and practical for automobiles.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a specific example of a mechanical transmission of the present invention applied to a heavy truck.

2 is a schematic view of the mechanical transmission shown in FIG.
Fork shaft and second and third
It is a fragmentary sectional view which crossed the shift fork at another angle.

[Explanation of symbols]

15 Second and third shift fork shaft 16 Second and third shift fork 19 Oil supply hole 20 Oil passage hole 21 Oil passage hole 22 Oil passage hole 24 Shifter head 25 Journal bore 26 Jet oil hole 27 fountain hole 28 fountain hole

Claims (3)

[Claims] 1. A second-and-third-shift fork shaft is provided with an oil feed hole extending in the lengthwise direction inward, and is opened at an outer peripheral surface at a predetermined position to communicate with the oil feed hole. Multiple lubrication holes are provided to guide the lubricating oil from the oil pump to the lubrication hole, and the second and third shift fork can slide on the shift fork shaft with the shifter head. And a plurality of spray holes drilled in the shifter head at predetermined positions communicating with the corresponding oil holes in the shift position, and the second speed or the third speed.
In the shifting operation for shifting to a high speed, one of the plurality of oil spray holes is communicated with a corresponding one of the plurality of oil passage holes according to the shifting operation and is idly supported on the output shaft. Lubrication oil is supplied to either one of the second speed gear and the third speed gear, and the other one of the plurality of oil injection holes corresponds to the plurality of oil passage holes according to the shift operation. A mechanical transmission that supplies lubricating oil to the synchromesh that is connected to the other one of the above and is assembled on its output shaft. 2. The mechanical transmission as claimed in claim 1, wherein the shift fork shaft has a solid metal round bar formed with an oil feed hole and an oil feed hole. 3. The shift fork shaft closes one end of the metal pipe to open an oil passage thereof.
Mechanical transmission described in.