JPH0557502U - Lubrication structure of transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To enhance the lubrication performance when the amount of lubricating oil to be scraped is small. [Structure] The oil path 11 has first openings 13a to 13g located on the valley bottom line 11c and second openings 14a to 14c located on the inclined surface. When the rotation speed is low and the amount of lubricating oil is small, a small amount of lubricating oil is supplied to the first openings 13a to 13g.
Through to the gears that require lubrication. At the time of high rotation in which the amount of lubricating oil increases, the amount of lubricating oil increases, so that it is guided to other gears and the like through the second openings 14a to 14c.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a lubricating structure for a transmission, which includes an oil path for guiding oil to each gear above a mission unit in a mission case.

[0002]

[Prior Art]

 Generally, in a gear transmission, a shaft that is rotatably supported by the above-mentioned mission case rotatably above the lubricating oil enclosed in the mission case is provided with an oil supply hole extending from one end thereof in the axial direction. A plurality of outflow holes that extend in the radial direction and open to the outer circumference and the oil supply hole are provided, and the bearings of each gear that slides the lubricating oil through the oil supply hole and the outflow hole of the shaft into the same shaft and slides. I am trying to supply it to the department. Further, it is provided with a substantially trough-shaped oil path arranged inside the mission unit of the mission case and guiding the lubricating oil to each gear, and a communication passage connecting the oil path to one end opening of the lubricating hole of the shaft. The lubricating oil scraped up by the gears is collected in an oil path, guided to the oil supply hole through the communication passage, and supplied to the bearings, sliding parts, etc. of each gear mounted on the shaft through the outflow hole. I try to lubricate the parts.

For example, as described in Japanese Utility Model Laid-Open No. 61-114156, another oil path is provided in addition to a normal oil path, an opening is formed in the oil path, and a lubricating oil is provided through the opening. Are known to supply gears to gears.

[0004]

[Problems to be solved by the device]

 However, such a device has two oil paths, and when the amount of lubricating oil scraped up by the gears is small, it is sufficient to supply all the gears with the lubricating oil through the openings. Inability to lubricate.

The present invention provides a lubrication structure for a transmission with improved lubrication performance when a small amount of lubricating oil is scraped up.

[0006]

[Means for Solving the Problems]

 The present invention is premised on a lubrication structure of a transmission in a mission case, which has a pair of inclined surfaces and which has an oil path having a substantially V-shaped cross section for guiding oil to each gear, above the mission unit. Therefore, the oil path is configured to have a first oil outflow portion located on the valley bottom line of the oil path and a second oil outflow portion located on the inclined surface.

[0007]

[Action]

 At low revolutions with a small amount of lubricating oil, a small amount of lubricating oil is introduced to the gears that require lubrication through the first oil outflow portion. At the time of high rotation where the amount of lubricating oil increases, the amount of lubricating oil increases, so that it is guided to other gears through the second oil outflow portion.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing a lubrication structure of a gear transmission, reference numeral 1 is a mission case, and a mission unit 2 is arranged inside the mission case. The mission unit 2 is composed of a primary shaft 3 and a secondary shaft 4 which are rotatably supported by the mission case 1 and a transmission gear train assembled to the shafts 3 and 4. The primary shaft 3 is connected to the crankshaft of the engine via clutch means (not shown). The secondary shaft 4 is linked to a ring gear 5 of a differential device. The transmission gear trains assembled on the shafts 3 and 4 are in mesh with each other.

Further, the lower half of the ring gear 5 of the differential device is immersed in the lubricating oil 6. As a result, part of the lubricating oil 6 is scraped upward by the ring gear 5.

Inside the mission case 1 and above the mission unit 2, an oil path 11 for guiding lubricating oil to each transmission gear is arranged along the axes of the shafts 3 and 4.

As shown in FIGS. 2 to 6, the oil path 11 extends upward from a pair of inclined surface portions 11 a and 11 b forming a substantially V-shaped cross section and both side edges of the inclined surface portions 11 a and 11 b. It has vertical wall portions 11c and 11d. The first opening 13a, 13b, 13c, 13d, 13e as the first oil outflow portion is formed on the intersection of the inclined surface portions 11a, 11b having the lowest vertical height of the oil path 11, that is, on the so-called valley bottom line 11e. , 13f and 13g are slightly higher than the first openings 13a to 13g, and the second openings 14a, 14b and 14c as the second oil outflow parts are slightly provided on the inclined surface parts 11a and 11b. It is formed so as to project downward. As a result, the lubricating oil is supplied only through the first openings 13a to 13g when the rotation speed is low with a small amount of lubricating oil, and through the first and second openings 13a to 13g and 14a to 14c when the rotation speed is high with a large amount of lubricating oil. Will be done.

Here, the first openings 13 to 13g are respectively provided with a reverse synchro device 21, a fifth speed gear shift horn (not shown), a fifth speed synchro device 23, a bearing portion 24, and a fourth speed gear. The synchro device 25 is provided corresponding to the 3rd speed shift hood 26 (see FIG. 5)) and the 3rd speed synchro device 27. The second openings 14a, 14b, 14c are provided corresponding to the reverse gear 31, the fifth speed gear 32, and the fourth speed gear 33, respectively.

The oil path 11 supplies the lubricating oil to the oil supply hole 3 a extending along the central axis of the primary shaft 3 via the communication member 15 in the vicinity of the end of the primary shaft 3. Reference numeral 16 is a cover member provided at the end of the mission case 1.

Further, the oil path 11 is arranged so as to be inclined so that the height thereof becomes lower toward the end portion of the primary shaft 3, so that the lubricating oil can easily flow.

A guide member 41 is integrally formed on the upper side of the oil path 11 and extends from the upper edge of the one vertical wall portion 11c to over the other vertical wall portion 11d. The guide member 41 is provided only for the portion where the ring gear 5 scrapes up the lubricating oil, and guides the lubricating oil scraped up by the ring gear 5 along the lower surface 41a of the guide member 41 to the oil path 11. It is designed to guide you.

According to the above structure, the lubricating oil scraped up by the ring gear 5 adheres to the lower surface 41a of the guide member 41, and the lower surface 41a is inclined. You will be guided towards Pass 11 and guided into Oil Pass 11. Since the guide member 41 is provided at the portion where the ring gear 5 scrapes up the lubricating oil, the lubricating oil scraped up by the ring gear 5 is reliably guided to the oil path 11 without waste.

Since the lubricating oil guided in the oil path 11 has a small amount of lubricating oil at low rotation speed, the lubricating oil is supplied only through the first openings 13a to 13g, and the synchronizing device requiring lubrication is required. By supplying the lubricating oil only to the etc., the lubricating oil is effectively supplied. The minimum supply amount of lubricating oil is about 40 cc / min (estimated).

On the other hand, at high rotation speed, the amount of lubricating oil increases, so that the lubricating oil is supplied not only through the first openings 13a to 13g but also through the second openings 14a to 14c. Lubricating oil is also supplied to gears that require lubrication. Then, the lubricating oil is supplied to the oil supply hole 3 a of the primary shaft 3 via the communication member 15. The maximum supply of lubricating oil is about 400cc / min (estimated).

As a result, the lubricating oil is supplied according to the operating conditions of low rotation and high rotation, and the lubrication performance is improved.

In the above embodiment, the second oil outflow portion is the same as the first opening portions 13a to 13g, but the second oil outflow portion has a notch for opening to the upper edge of the vertical wall portion. You can also do it.

[0022]

[Effect of the device]

 Since the present invention is configured as described above, a small amount of lubricating oil is guided to only the gears requiring lubrication through the first oil outflow portion at the time of low rotation with a small amount of lubricating oil, while the amount of lubricating oil increases. At high rotation speed, the amount of lubricating oil increases, so that it is guided to the other gears through the second oil outflow portion, and good lubrication can be achieved regardless of the amount of lubricating oil.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a transmission.

FIG. 2 is a vertical sectional view showing a lubrication structure of a transmission.

FIG. 3 is a plan view near an oil path.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 1 mission case 2 mission unit 11 oil path 13a to 13g 1st opening part (1st oil outflow part) 14a to 14c 2nd opening part (2nd oil outflow part)

Claims (1)

[Scope of utility model registration request] 1. A lubrication structure for a transmission, comprising a pair of inclined surfaces and a substantially V-shaped oil path in cross section for guiding oil to each gear in a mission case above the mission unit. A lubricating structure for a transmission, characterized in that each of the oil paths is formed with a first oil outflow section located on a valley bottom line of the oil path and a second oil outflow section located on an inclined surface. .