JPS6223839A - Oil pump of transfer for vehicle - Google Patents

Abstract

PURPOSE:To aim at prevention of an efficiency drop in a device on the whole and improvement in the durability of a pump, by installing the oil pump for external cooling or forced lubrication by lubricating oil in a transmission mechanism, and driving this pump in a way of being interlocked only at a time when the transmission mechanism is driven. CONSTITUTION:A transmission mechanism 23 in a transfer 10 consists of a first sprocket 26 being fitted in a sleeve 21, a second sprocket 25 being solidly formed in a second output shaft 22 and a chain 27 being tensely installed between both these sprockets 25 and 26. In this case, an oil pump 50 is set up there, and its driving gear 51 is fitted in the other end of the second output shaft 22 with a spline 22'. And, a support 45' of a bearing 54 is fitted in a pump body 53. In addition, a reservoir 44A is formed in a case 44 by a reservoir plate 55, and an oil passage from the reservoir 44A is formed in cases 44 and 45, while oil is led into the suction side of the pump 50 after being led into a stariner.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle transfer equipped with an oil pump.

BACKGROUND ART AND PROBLEMS Conventionally, a chain type transmission mechanism used for a vehicle transfer includes an input shaft, an output shaft arranged in parallel with the input shaft, and a first sprocket provided on the input shaft. The transmission mechanism includes a second sprocket provided on the output shaft, a chain that transmits rotation between the first sprocket and the second sprocket, and a transmission mechanism case forming a transmission mechanism chamber that houses these. When lubricating the engine, the rotation of the transmission mechanism stirred the lubricating oil that had accumulated at the bottom of the transmission mechanism chamber.

However, in the above-mentioned conventional transmission mechanism, as the rotation of the transmission mechanism increases, the amount of lubricating oil that is scattered due to stirring increases, so the oil level of the lubricating oil that accumulates at the bottom of the transmission mechanism chamber decreases, causing 'LIJ? m shortage is likely to occur. For this reason, the amount of lubricating oil is set so as to provide sufficient lubrication even during high-speed rotation, so the oil level becomes high and the oil temperature tends to rise due to agitation of the lubricating oil.

Heat is also generated due to friction between the link plates of the chain and between the link plates and the pins, which also causes an increase in oil temperature.

An increase in oil temperature reduces the durability of seals, hair rings, etc., and also reduces the lubricating performance of the lubricating oil.

In order to reliably prevent the temperature of the lubricating oil from rising as described above, the present invention provides an oil pump to circulate the lubricating oil via an external cooler, or forcibly lubricates the transmission mechanism, etc. The purpose of this invention is to enable the oil pump to be efficiently driven only when necessary.

Means and Effects for Solving the Problems According to the present invention, the pump attached to the transmission mechanism of a vehicle transfer is linked to the rotation of the transmission mechanism and is driven only when the transmission mechanism is driven.

The oil pump is driven only when the transmission mechanism is driven, and the lubricating oil in the transmission mechanism case is sent to an external cooler, where it is cooled and then returned to the case, or forced lubrication of the transmission mechanism, etc. is performed.

Embodiment The first output of the transfer 10, which is arranged in series with the input shaft 11, is the transfer 10 which is the auxiliary transmission, the clutch C3 which is the frictional engagement element, the brake B4, and the clutch C4 which is the two-wheel/four-wheel switching mechanism. a shaft 12, a planetary gear set I) disposed between the input shaft 11 and the first output shaft 12;
f, a four-wheel drive sleeve 21 which is an input shaft of a transmission mechanism and is rotatably fitted onto the first output shaft 12; a second output shaft 22 that is the output shaft of the attached transmission mechanism;
The transmission mechanism 23 includes the sleeve 21, the second output shaft 22, and other components. These planetary gear set Pf and brake B4 constitute an underdrive.

Clutch C4 connects the first output shaft 12 to 1-transfer 10.
This is a multi-disc friction clutch for connecting and disconnecting the sleeve 21 connected to one sprocket 26 of the transmission mechanism 23 that drives the second output shaft 22 of the hydraulic servo C-4.
activated by

The transmission mechanism 23 includes a first sprocket 26, which is a first rotating body spline-fitted to the sleeve 21, and a second output shaft 2.
The second sprocket 25 is a second rotating body integrally formed with the second sprocket 2, and the chain 27 is a transmission mechanism stretched between these sprockets 25 and 26.

During normal driving, the line pressure supplied to the hydraulic control device of the automatic transmission is supplied to the hydraulic servo C-3 of the clutch C3 to engage the clutch C3, and the hydraulic servos B-4 and C-
4 to release the brake B4 and clutch C4. As a result, the planetary gear center Pf is integrated, power is transmitted from the input shaft 11 to the first output shaft 12 at a reduction ratio l, and two-wheel drive driving is achieved with only the rear wheels.

At this time, power from the input shaft 11 is transmitted to the first output shaft 12 via the clutch C3.

When four-wheel drive driving becomes necessary during this two-wheel drive driving, the shift lever of the transfer 10, which is a speed selection means installed in the driver's seat, etc., is manually shifted, and the transfer control device 3
When line pressure is gradually supplied from 0 to the hydraulic servo C-4 and the clutch C4 is smoothly engaged, the first output shaft 12 and the sleeve 21 are connected, and the transmission mechanism 23 and the second output shaft 2 are connected.
Power is also transmitted to the front wheels via the front wheel drive propeller shirt L- (not shown), and the power is transmitted from the input shaft 11 to the first output shaft 12 and the second output shaft 22 at a reduction ratio of 1. A driving feeling directly connected to wheel drive (high-speed four-wheel drive state) can be obtained.

During this 4-wheel drive driving, if you need to increase the output torque such as on a steep slope, manually shift the shift lever to 1, and the hydraulic pressure to the hydraulic servo will be applied to the switching valve between the high-speed 4-wheel drive state and the low-speed 4-wheel drive state. While gradually supplying line pressure to hydraulic servo B-4, hydraulic servo C is activated at appropriate timing.
-3 hydraulic pressure is discharged, the brake B4 is gradually engaged, and the clutch C3 is smoothly released. As a result, the power is decelerated from the input shaft 11 via the planetary gear set Pf and transmitted to the first output shaft 12 and the second output shaft 22, resulting in a 4-wheel drive decelerated running state (low-speed 4-wheel drive state) with large torque. It will be done.

The auxiliary transmission case 40 includes an input side chamber 43a that houses an electronically controlled vehicle speed sensor 47, an extension housing 43 that forms a reduction mechanism chamber 43b that houses an underdrive, and a switching mechanism chamber 44a that houses a clutch C4. A rear transmission mechanism case 45 which together with the front transmission mechanism case 44 forms a transmission mechanism chamber 45a that houses the transmission mechanism 23, and a rear chamber 46a that houses the speed make dry gear 48 and also forms a transmission mechanism chamber 45a that houses the transmission mechanism 23 and a rear transmission mechanism case 45 that forms a transmission mechanism chamber 45a that houses the transmission mechanism 23, It consists of an extension housing 46 that forms the rear cover of the machine case 40.

The transmission mechanism case 44.45 has an oil seal Sl.

It is separated from other rooms by S2.

The oil pump 50 is an internal gear type pump, and a drive gear 51 is fitted to the other end of the second output shaft 22 via a spline 22'.

52 is a driven gear, and 53 is a pump body.

The fitting between the sabot 1-45' of the bearing 54 and the pump body 53 is a spigot fitting.

A reservoir 44A is formed in the case 44 by a serper plate 55 to store oil caused by the chain's scraping.

An oil passage from the Zaher 44A is formed in the case 44, 45, and the oil is guided to a strainer 56 to collect foreign matter in the case and prevent damage due to foreign matter getting caught in the oil pump gear.

The oil is guided from the strainer 56 to the suction side of the pump 50, and from the discharge side of the pump, the oil is introduced from the pipe joint 57 to the reservoir 44A via the external cooler 70 as shown in FIG.
will be returned to.

If necessary, the discharge side is connected to the axial oil passage 58 of the second output shaft 22.
The lubricating oil is forcibly supplied to the chain 27 from the radial oil passage 59 by centrifugal force. Reference numeral 60 indicates a relief valve.

In Figure 1, the oil flow is indicated by arrows.

FIG. 2 is an oil circulation diagram, and although the lubrication of the bearing 54 and the first oil pump 1-26 is not shown in the embodiment of FIG. 1, a radial oil passage is provided for the bearing 54, and 1 sprocket 26 can be forcibly lubricated by guiding the discharge side of the oil pump through a tube (not shown).

In the embodiment, a chain is used as the transmission mechanism, but it goes without saying that power may be transmitted by meshing gears, or other methods may also be used.

In addition to the embodiments shown above, the pump 50 may be installed at locations that depend on the rotation of the sprocket 26, 25, such as the hub of the clutch C4, the drive shaft (sleeve) 21, etc.
etc., or in the case of gear drive, a counter shaft etc. can be used, and the same effect can be obtained.

Effects of the Invention According to the present invention, since the oil pump is driven only when the transmission mechanism is driven and the oil temperature rises, it is possible to prevent a decrease in the efficiency of the entire device and improve the durability of the pump.

[Brief explanation of the drawing]

The drawings are longitudinal sectional views of embodiments of the present invention, and FIG. 2 is an oil circulation diagram. 10...Vehicle transfer 23...Transmission mechanism 50...Oil pump 58.59...(For forced lubrication) Oil passage 70...External cooler Representative Lawyer Patent attorney Yohei Kinoshita 2nd person Figure 2 Procedure Neho (correct writing method) % formula % 1. Indication of incident Patent application 1987 1629032,
Title of the invention Relationship to the 3° amendment case for oil pumps for vehicle transfer Patent applicant name Name 1 person other than Aisin Warner Co., Ltd. 4, agent 105 Address 2-6-7 Toranomon, Minato-ku, Tokyo 6. Subject of amendment Column 7 of brief description of drawings in the specification, Contents of amendment The statement "The drawing is" on page 10, line 3 of the specification is amended to "Fig. 1 is".

Claims (1)

[Claims] An oil pump is provided for external cooling or forced lubrication of lubricating oil of a transmission mechanism in a vehicle transfer, and the oil pump is interlocked with the rotation of the transmission mechanism and is driven only when the transmission mechanism is driven. A vehicle transfer oil pump.