JPH06221411A - Gear type transmission structure - Google Patents

Abstract

PURPOSE:To supply oil to a pilot bearing part even when an oil surface is inclined because of running on a slope by providing a lubrication oil guide part in an inner circumferential wall surface of a through-hole formed inside a counter shaft. CONSTITUTION:An oil guide hole 15 penetrating a counter shaft 5 completely from a rear end side to a front end side is formed inside a shaft body of the counter shaft 5, and a spiral oil guide groove 15A is formed in an inner circumferential wall surface of the oil guide hole 15 continuously in such a way that centrifugal force action at the time of rotation is directed to the front end side of the counter shaft. Transmission oil is thus supplied securely using oil transfer action of the oil guide hole 15 having the oil guide groove 15A in the shaft front end side direction, and lubrication oil is scattered to a pilot bearing 6 sufficiently by rotation of an input gear 3 for lubrication. The pilot bearing 6 can thus be lubricated constantly regardless of a running condition of a vehicle, thereby lubrication performance is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for a gear type transmission.

[0002]

2. Description of the Related Art Generally, a gear type transmission (gearmatic transmission) is divided into two types, one for FF and RR vehicles and the other for FR vehicles, due to its structure, and each has the following characteristics.

Geared transmission (transaxle) for FR and RR vehicles Since the final reduction gear is incorporated in the transmission, the input shaft and the output shaft are not on the same line. Particularly in the case of the horizontal type, each gear ratio is determined by one set (two) of gears, and the total length is also limited due to the layout of the vehicle, and there are many design restrictions.

Geared transmission for FR vehicles The transmission has a major feature that an input shaft and an output shaft can be installed in series on the same line, and a direct connection stage (gear ratio 1: 1) with an engine can be obtained. There is. For this reason, the gear ratio is 2 sets (4 pieces) for the convenience of providing a counter shaft (sub shaft) for gear shifting.
You will get it with the gears. The restriction in the longitudinal direction also has a considerably greater degree of freedom than the above-mentioned transversal transaxle.

By the way, the latter FR type gear type transmission having the above-mentioned characteristics is disclosed in, for example, Japanese Patent Laid-Open No. 62-414.
As disclosed in Japanese Patent Laid-Open No. 48, an input shaft connected to an engine output shaft via a clutch, a shift counter shaft rotating in conjunction with the input shaft via a drive gear and the input gear, and a front end thereof. Is disposed parallel to the counter shaft in a state of being rotatably supported by a rear end of the input shaft via a bearing member, and is connected to a drive shaft of the vehicle via a differential device. And a plurality of speed change gears are provided between the counter shaft and the output shaft. Then, one of the plurality of speed change gears is selected by the shift fork of the shift lever and brought into a connected state in which power can be transmitted, so that the input shaft has the reduction ratio determined by the gear ratio of the gear train. The rotation of is transmitted to the output shaft.

On the other hand, among the plurality of gears forming the gear train for shifting, the counter shaft side shifting gear is fixedly provided on the counter shaft, and further, for the second shifting gear provided on the output shaft. The gear is rotatably provided with respect to the output shaft, and by connecting one of the second speed changing gears to the output shaft by operating the shift fork of the shift lever, the gear train is brought into a power transmission state. To be done.

When the second speed change gear is connected to the output shaft as described above, the second speed change gear or the second speed change gear is connected to the output shaft rotating at a speed corresponding to the vehicle speed. In order to synchronize the rotations of the input shaft and the counter shaft that are constantly interlocked with the speed change gear via the first speed change gear, the output shaft and the second speed change gear on the same output shaft are provided. A synchronous meshing device (synchronizer) is provided between them.

[0008]

By the way, in such a structure, since the input gear on the counter shaft side and the corresponding drive gear on the input shaft side are constantly meshed and rotated, The lubrication requirement is inevitably higher than that of the gear.

As described above, the output shaft is fitted and supported on the rear end of the input shaft via a bearing member such as a pilot bearing. The relative rotational speed between them is quite high. Therefore, the demand for lubricating oil in the bearing is particularly high.

Therefore, generally, the transmission oil stored in the bottom portion of the transmission housing is used in the drive gear portion and the pilot bearing portion on the input shaft side by utilizing the rotation of the input gear or the like provided at the front end of the counter shaft. A lubrication system that scrapes up and lubricates is adopted, but in that case, for example, when the vehicle goes uphill, the oil surface moves to the counter shaft rear end side, and the counter shaft front end side In some cases, the input gear cannot lubricate (raise) oil.

Under such circumstances, as a conventional example, as disclosed in Japanese Utility Model Laid-Open No. 64-29565, an oil guide hole having a predetermined length from the rear end side to the front end side is formed in the shaft body of the counter shaft. It is also seen that the oil guide hole is formed to open the oil guide hole in the direction of the action of the concentric force to supply oil, but in the configuration, the oil guide hole reaches the input gear and is formed. In addition, since the oil guide hole is merely a straight through hole, no oil supply action occurs, and when the oil surface is inclined by the above-described uphill traveling, the pilot bearing portion is completely removed in the same manner as in the conventional example described above. Oil supply becomes impossible.

[0012]

The structure of the gear type transmission according to the inventions described in claims 1 to 3 of the present application is made for the purpose of solving the above problems. It is configured.

(1) Structure of the Invention According to Claim 1 In the gear type transmission structure of the present invention, the front end of the output shaft is rotatably supported relative to the rear end of the input shaft via a bearing member. A gear-type transmission in which a counter shaft that rotates integrally with the input shaft is provided in parallel with the output shaft, and one end of the counter shaft is located in the vicinity of the bearing member. A through hole penetrating in the axial direction is formed in the inner wall surface of the through hole, and a lubricating oil guide portion for guiding the lubricating oil from the one end side of the shaft to the other end side of the shaft is provided on the inner peripheral wall surface of the through hole. It is a feature.

(2) Structure of the Invention According to Claim 2 A gear type transmission structure according to the invention is based on the structure of the invention according to claim 1, wherein the counter shaft in the structure is
It is characterized in that it is located below the input shaft.

(3) Structure of the Invention According to Claim 3 The gear type transmission structure according to the invention is based on the structure of the invention according to claim 1 or 2, and in the structure, the front end portion of the counter shaft is Is provided with a gear that serves to scrape up the oil toward the bearing member.

[0016]

The invention described in each of claims 1 to 3 of the present application operates as follows corresponding to each of the above configurations.

(1) Action of the Invention According to Claim 1, In the structure of the gear type transmission structure of the present invention, the front end of the output shaft is rotatably supported relative to the rear end of the input shaft through the bearing member. On the other hand, in a gear type transmission in which a counter shaft that rotates integrally with the input shaft is provided in parallel with the output shaft, and one end of the counter shaft is located near the bearing member, A through hole penetrating in the axial direction is formed in the shaft body, and a lubricating oil guide portion for guiding the lubricating oil from one end side of the shaft to the other end side of the shaft by rotating the counter shaft is provided on the inner peripheral wall surface of the through hole. The lubricating oil is actively introduced from the rear end side of the counter shaft to the vicinity of the front end side bearing member.

Therefore, even if the oil surface moves to the rear end side of the counter shaft and the oil cannot be scraped up by the input gear on the counter shaft side when the vehicle is traveling uphill, the input shaft can be sufficiently squeezed. Oil can be supplied to the rear end drive gear and the bearing member portion.

(2) Operation of the invention of claim 2 In the structure of the gear type transmission structure of the invention, in the structure of the invention of claim 1, the counter shaft is arranged below the input shaft. As a result, the above-mentioned oil supply action is surely guaranteed.

(3) Operation of the invention according to claim 3 In the structure of the gear type transmission structure according to the invention, in the structure of the invention according to claim 1 or 2, the front end portion of the counter shaft is provided with the bearing member. Since a gear (for example, an input gear) that performs an oil scraping action toward the counter shaft is provided, the oil supplied near the front end bearing member of the counter shaft is efficiently supplied to the bearing portion of the bearing member such as the pilot bearing. It

[0021]

As a result of the above, according to the gear type transmission structure of the invention described in claims 1 to 3 of the present application, the following (1) to
The effect like (3) can be obtained.

(1) Since the counter shaft can be used to lubricate the bearing member, it is not necessary to separately use a lubricating member such as an oil path, so that the entire transmission can be made compact.

(2) The lubricating oil accumulated on the lower side of the transmission casing 6 can be effectively used.

(3) Lubricating oil can be reliably scattered on the bearing member.

[0025]

FIG. 1 shows the structure of an FR type gear type transmission according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a transmission case of the transmission. An input shaft 2 connected to an engine output shaft via a clutch and an input shaft 2 are provided in an inner central shaft portion of the transmission case 1. A counter shaft 5 having an input gear 3 fixed to the front end thereof, meshing with a drive gear 4 formed on the outer periphery of the rear end of the input shaft 2, and rotating constantly in cooperation with the input shaft 2, and the counter shaft 5 Are arranged in parallel with each other, and the front end thereof is loosely fitted and supported in the rear end of the input shaft 2 via the pilot bearing 6 so as to be relatively rotatable. And an output shaft 8 connected to the drive shaft,
Further, between the counter shaft 5 and the output shaft 8, the third speed, the second speed, the first speed, and the fifth speed are sequentially applied from the front end side to the rear end side.
Multiple sets of gears for speed change, reverse, No3G, No2
G, No1G, No5G, and NoRG are installed. Then, the plurality of speed change gear trains No1G to No5G, N
oRG one of the shift fork 10,1 of the shift lever 9
The rotation of the input shaft 2 is transmitted to the output shaft 8 at a speed reduction ratio determined by the gear ratio of the gear train by selecting 0 ... There is.

By the way, in such a construction, the input gear 3 at the front end of the counter shaft 5 and the corresponding (meshable) input shaft 2 rear end side drive gear 4 are always meshed and rotated. Therefore, the lubrication requirement is inevitably higher than that of other gears.

Further, as described above, the output shaft 8 is relatively fitted to the rear end portion of the input shaft 2 via the pilot bearing 6 (bearing member). The relative speed between the two shafts is high, and therefore the lubricating oil requirement at the bearing is particularly high.

Therefore, the above transmission case 1
An oil storage portion 12 dripping downward is formed on the bottom side of the transmission gear MO. The transmission oil MO stored in the oil storage portion 12 is constantly utilized by the rotation of the input gear 3 provided on the counter shaft 5. A system for scraping up and lubricating the pilot bearing 6 is adopted.

However, in this case, as described above, for example, when the vehicle goes uphill, the oil MO
The surface moves to the rear end side of the counter shaft 5 as shown in the figure, and there is a case where the oil cannot be lubricated only by the lubricating oil scraping action of the input gear 3 on the front end side of the counter shaft 5.

Therefore, in the embodiment of the present invention, as shown in the figure, the counter shaft 5 is provided in the shaft body of the counter shaft 5.
An oil guide hole 15 that completely penetrates from the rear end side to the front end side is formed, and a spiral oil guide groove 15A is formed on the inner peripheral wall surface of the oil guide hole 15 so that the direction of action of the circular center force when rotating is the counter shaft direction of the counter shaft. The transmission oil is formed continuously so as to face the front end side direction, and the oil transfer action of the oil guide hole 15 having the oil guide groove 15A toward the shaft front end direction is utilized to reliably transmit the transmission oil up to the input gear 3 portion. The lubricating oil is supplied and the lubricating oil is sufficiently scattered on the pilot bearing 6 by the rotation of the input gear 3 to achieve the lubrication.

Therefore, in this structure, the pilot bearing 6 can always be lubricated regardless of the running state of the vehicle, and the lubrication performance is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a gear type transmission according to an embodiment of the present invention.

[Explanation of symbols]

1 is a transmission case, 2 is an input shaft, 3 is an input gear, 4 is a drive gear, 5 is a counter shaft, 6 is a pilot bearing, 8 is an output shaft, 15 is an oil guide hole, and 15A is a spiral oil guide groove. is there.

Claims (3)

[Claims] 1. A front end of an output shaft is rotatably supported by a bearing member relative to a rear end of the input shaft, while a counter shaft rotating integrally with the input shaft is aligned with the output shaft. In the gear type transmission in which one end of the counter shaft is located in the vicinity of the bearing member, a through hole penetrating in the axial direction is formed inside the shaft body of the counter shaft, and the inner circumference of the through hole is formed. A gear type transmission structure characterized in that a lubricating oil guide portion for guiding lubricating oil from one end side of the shaft to the other end side of the shaft is provided on a wall surface by rotating the counter shaft. 2. The gear type transmission structure according to claim 1, wherein the counter shaft is arranged below the output shaft. 3. The gear type transmission structure according to claim 1, wherein a gear that fulfills an oil scraping action toward the bearing member is provided at a front end portion of the counter shaft. .