JPH0589061U - Lubrication structure of transfer device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to improve the fuel consumption of a transfer device lubrication structure. [Structure] An oil sump for collecting lubricating oil by hoisting a chain, a diaphragm pump for sucking and discharging the lubricating oil and sending it to the lubricating passage of the main shaft, a vacuum for driving the diaphragm pump, and an engine for operating the vacuum. And a switching means for activating the switching means when the vehicle speed is equal to or higher than a predetermined vehicle speed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubrication structure for a transfer device.

[0002]

[Prior Art]

 As a conventional lubrication structure of a transfer device, there is an oil pump provided in a case. For example, an inner gear is provided on the main shaft that is rotatably housed in the case, an outer gear is provided outside the inner gear, and the rotation of the main shaft causes the oil sump formed in the case to pass through a strainer Inhales lubricating oil and acts as a pump.

Lubricating oil is pressure-fed to each lubricating portion from a lubricating passage formed inside the main shaft.

[0004]

[Problems to be solved by the device]

 However, in such a conventional lubrication structure of the transfer device, since the lubricating oil is secured so that air is not sucked from the strainer, unnecessary lubricating oil is pumped at a low speed to agitate the lubricating oil. The friction by is increasing. As a result, there is a problem that fuel efficiency cannot be improved.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a lubrication structure for a transfer device capable of improving fuel efficiency.

[0006]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides a transfer device having a sprocket in which a main shaft having a lubricating passage formed therein is rotatably housed in a case and a chain is installed on the main shaft. Oil pool that collects the lubricating oil by lifting it up, a diaphragm pump that sucks and discharges the lubricating oil and sends it to the lubricating passage of the main shaft, a vacuum that drives the diaphragm pump, and an engine that operates the vacuum. And a switching means for activating the switching means when the vehicle speed is equal to or higher than a predetermined speed.

[0007]

[Action]

 In the present invention, the switch means is turned on only when the vehicle speed is a predetermined speed, for example, 100 km / h or higher, and the vacuum is activated by switching the switching means, and the lubrication is stored in the oil sump by lifting the chain. Intakes and discharges oil and sends it to the main shaft lubrication passage.

Therefore, the amount of oil is sufficient to ensure lubrication even at high speeds, and the amount of oil can be reduced. As a result, it is possible to reduce friction due to stirring of the lubricating oil and improve fuel efficiency.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. First, the structure will be described. In FIG. 1, reference numeral 1 is a main shaft, and the main shaft 1 is rotatably housed in a case 4 via bearings 2 and 3. A lubricating passage 5 through which lubricating oil flows is formed inside the main shaft 1.

Reference numeral 6 is a drive sprocket, and the drive sprocket 6 is rotatably supported by the main shaft 1 via a bearing 7. A chain 9 is installed between the drive sprocket 6 and the driven sprocket 8, and the driven sprocket 8 is formed integrally with the front drive shaft 10. The front drive shaft 10 is rotatably supported by the case 4 via a bearing 11.

A viscous coupling 12 having an inner plate and an outer plate is provided on the main shaft 1. By fastening the viscous coupling 12, the rotational force of the main shaft 1 is transmitted to the drive sprocket 6. Reference numeral 13 is a coupling sleeve for switching to 2WD, viscous 4WD or lock, and 14 is a shift fork for moving the coupling sleeve 13.

Reference numeral 15 denotes an oil sump provided in the case 4, and the lubricating oil is accumulated in the oil sump 15 by raising the chain 9. A check valve 17 is provided in the outlet passage 16 of the oil sump 15. Reference numeral 18 denotes a vacuum, and the inside of the vacuum case 19 of the vacuum 18 is divided into two pressure chambers 22 and 23 by a diaphragm 21 fixed to the end of the piston rod 20.

The piston rod 20 is slidably inserted into a pump chamber 24 communicating with the outlet passage 16, and the pump chamber 24 communicates with the lubricating passage 5 of the main shaft 1. A check valve 25 is provided at the outlet of the pump chamber 24. Reference numeral 26 is a switching unit as switching means, and the switching unit 26 switches the negative pressure from the engine introduced into the pressure chambers 22 and 23.

The switching unit 26 is connected to a power supply 28 via a power supply line 27, and a switch (switch means) 29 is interposed in the power supply line 27. The switch 29 is automatically turned on when the vehicle speed is a predetermined value, for example, 100 km / h or more. Incidentally, 30 is a Welch plug. Next, the operation will be described.

Natural lubrication is performed in the low speed range. That is, by lifting the chain 9, the lubricating oil is scattered to lubricate each part. The lubrication is performed by operating the vacuum 18 at a high speed (100 km / h or more) where lubrication is sufficiently required. When the vehicle speed exceeds 100 km / h, the switch 29 is turned on, the switching unit 26 is supplied with power from the power source 28, and the operation is started.

When negative pressure from the engine is introduced into the pressure chamber 22 by switching the switching unit 26, the piston rod 20 moves upward in the figure due to the displacement of the diaphragm 21, and the chain 9 is lifted to collect oil. The lubricating oil stored in 15 is sucked into the pump chamber 24. At this time, the check valve 17 in the outlet passage 16 is open, and the check valve 25 in the pump chamber 24 is closed.

Next, when the negative pressure from the engine is introduced into the pressure chamber 23 by switching the switching unit 26, the piston rod 20 moves downward in the drawing, and the sucked lubricating oil is discharged from the pump chamber 24. , Into the lubrication passage 5 of the main shaft 1. At this time, the check valve 17 in the outlet passage 16 is closed, and the check valve 25 in the pump chamber 24 is open. In this way, the lubricating oil pumped to the lubrication passage 5 can sufficiently lubricate each lubricated portion.

As described above, the amount of oil is sufficient to ensure lubrication up to a high speed, so that the amount of oil can be reduced. Therefore, friction due to stirring of the lubricating oil can be reduced, and fuel consumption can be improved.

[0019]

[Effect of the device]

 As described above, according to the present invention, since the diaphragm pump is used only for high speed lubrication, the amount of lubricating oil can be reduced, and the friction due to stirring of lubricating oil can be reduced. Therefore, the fuel efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1: Main shaft 2, 3: Bearing 4: Case 5: Lubrication passage 6: Drive sprocket 7: Bearing 8: Driven sprocket 9: Chain 10: Front drive shaft 11: Bearing 12: Viscous coupling 13: Coupling sleeve 14: Shift fork 15: Oil sump 16: Outlet passage 17, 25: Check valve 18: Vacuum 19: Vacuum case 20: Piston rod 21: Diaphragm 22, 23: Pressure chamber 24: Pump chamber 26: Switching unit (switching means) 27 : Power supply line 28: Power supply 29: Switch (switch means) 30: Welch plug

Claims (1)

[Scope of utility model registration request] 1. A transfer device having a sprocket in which a main shaft having a lubrication passage formed therein is rotatably housed in a case and a chain is erected on the main shaft, and lubricating oil is accumulated by lifting the chain. An oil sump, a diaphragm pump that sucks and discharges the lubricating oil, and sends the lubricating oil to the lubricating passage of the main shaft; a vacuum that drives the diaphragm pump; and a switching unit that switches negative pressure from the engine that operates the vacuum. A lubricating structure for a transfer device, comprising switch means for activating the switching means at a vehicle speed equal to or higher than a predetermined speed.