JP2002122218A - Lubricating mechanism of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating mechanism of a transmission providing a smooth and light shift operation in a state that oil is highly viscous in a low temperature and pipe inside pressure is high. SOLUTION: This lubricating mechanism of the transmission is so formed that oil in a gear case 1 is sucked by an oil pump 3, taken into an oil filter 10 by an discharge oil passage 6, and fed to respective oil feed parts from the oil filter 10 by an oil feed passage 8. This lubricating mechanism is provided with a control valve 20 for receiving a hydraulic pressure of a discharge oil passage 6 towards a downstream of a relief valve 7, for closing the feed oil passage 8 and cutting off the oil feed to the respective oil feed parts when the oil viscosity is high in a low temperature and the pressure exceeds a prescribed high-pressure value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication mechanism for a transmission that sucks oil in a gear case and supplies oil to each oil supply unit.

[0002]

2. Description of the Related Art In a conventional transmission lubrication mechanism, the supply of oil to a journal portion of each gear 16 of a main shaft 14 and each oil supply portion of a synchro mechanism portion 17 shown in FIGS. 7 and 8 is driven by a counter shaft. The oil in the gear case 1 is sucked from the strainer 2 by the oil pump 3 and the oil filter 1 formed on the outside of the gear case 1 from the oil pump 3.
The oil filter 10 passes through a discharge oil passage 6 provided with a relief valve 7 connected and piped to a discharge oil passage outlet 6a opened to a mounting seat 9 of the oil filter 10.
The oil filtered by the filter is attached to the mounting seat 9 of the oil filter 10.
The oil muffler 5 is guided to the oil muffler 5 by a supply oil passage 8 connected and connected to an oil supply muffler 5 serving as an oil intake to each oil supply portion. Through an oil passage 15 passing through the axis of the oil passage.

The oil that has been sucked in the oil in the gear case 1 by the oil pump 3 is controlled to a constant pressure (constant flow rate) by a relief valve 7, surplus oil is returned into the gear case 1, and the oil controlled to a constant pressure (constant flow rate) is removed. As described above, the oil that has been supplied to each oil supply unit and that has played a role of lubrication in each oil supply unit is returned into the gear case 1.

[0004]

In the conventional lubrication mechanism for a transmission described above, the shift operation force becomes heavy in cold weather, and the shift operability may be deteriorated. The reason for this is that the viscosity of the low-temperature oil increases immediately after the engine is started in cold weather, and the increase in the oil viscosity causes the pressure in the discharge oil passage 6 and the supply oil passage 8 to be high. This is because high-pressure oil is supplied to the journal portion of each gear 16 of the main shaft 14 and each oil supply portion of the synchronization mechanism 17. Incidentally, when the oil temperature is as low as 10 ° C., the viscosity of a generally used oil is 1000 mm ² / s, and the pressure in the φ10 pipeline is 5 mm.
It is 88 Pa.

[0005] The control of the supply oil by the relief valve 7 is to suppress the rise of the oil discharge pressure (flow rate) due to the high-speed rotation of the oil pump 3 accompanying the high-speed rotation of the engine and to control the oil to a constant pressure (constant flow rate). In the case of oil having a high viscosity at a low temperature and a high pressure, it is insufficient to reduce the pressure by a normally used relief valve 7. Although it is possible to sufficiently reduce the pressure of the high-pressure and high-pressure oil at low temperature by increasing the diameter of the relief oil passage of the relief valve 7, the relief oil of the relief valve 7 can be reduced. Increasing the diameter of the road is practically impossible due to space, etc., and therefore, increasing the cost of increasing the power shift and using expensive low-viscosity oil to reduce the shift operation force And the structure had to be changed drastically.

An object of the present invention is to provide a high viscosity at low temperature or the like,
Further, it is an object of the present invention to provide a lubrication mechanism for a transmission capable of obtaining smooth and light shift operability in an oil state where the pressure in a pipeline is high.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a discharge oil passage provided with a relief valve for controlling oil at a constant pressure by sucking oil in a gear case by an oil pump. In a lubrication mechanism of a transmission, which is taken into an installed oil filter and supplied from the oil filter to each lubricating section via a supply oil passage, the oil pressure in the discharge oil passage downstream of the relief valve is received, and the oil pressure is reduced by the relief oil. A control valve that opens and closes the supply oil passage when the pressure exceeds a predetermined high pressure that cannot be controlled by the valve, and closes the supply oil passage when the oil viscosity at a low temperature is high and exceeds a predetermined high pressure value Thus, refueling to each of the refueling sections is shut off.

The oil in the gear case is sucked by an oil pump and taken into an oil filter mounted on the outer surface of the gear case through a discharge oil passage provided with a relief valve for controlling the oil to a constant pressure. In the lubrication mechanism of the transmission to be supplied to each oil supply unit, the hydraulic pressure of the discharge oil passage downstream of the relief valve is received, and when the hydraulic pressure exceeds a predetermined value of a high pressure that cannot be controlled by the relief valve, the vehicle moves backward. When the oil pressure is equal to or less than a predetermined value, a pressure receiving surface member that advances by a spring and returns to its original position, and the supply oil passage that is formed integrally with the pressure receiving surface member and that opens and closes by retreating and moving forward. A control valve consisting of a valve plate that closes the supply oil passage when the oil viscosity at high temperature is high and the pressure exceeds a predetermined value of high pressure It is characterized in that so as to cut off the fuel supply of said each oil supply portion Te.

In the transmission lubrication mechanism, a control valve is arranged between the oil filter and the discharge oil passage outlet and the supply oil passage inlet provided in the oil filter mounting portion of the gear case. .

[0010] In the lubrication mechanism of the transmission, a control valve is disposed between the discharge oil passage and the supply oil passage downstream of the relief valve in the gear case.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a gear case of a transmission, in which oil is stored at the bottom. Reference numeral 2 denotes a strainer which is an oil suction port at the bottom of the gear case 1 and is connected to the suction side of the oil pump 3 by piping. The oil pump 3 is generally driven by rotation of a counter shaft.

A mounting seat 9 for mounting an oil filter 10 is formed on an outer surface of the gear case 1.
The mounting seat 9 has a discharge oil passage outlet 6a and a supply oil passage inlet 8a.
And are open at intervals. Therefore, the mounting seat 9
The oil filter 10 is connected to a discharge oil passage outlet 6a and a supply oil passage inlet 8a. A discharge oil passage 6 is connected and connected to the discharge oil passage outlet 6a and the discharge side of the oil pump 3, and the supply oil passage inlet 8a is omitted in FIG. 5 is connected to a supply oil passage 8.

The oil muffler 5 includes a main shaft 14
The oil passage 15 penetrates the axis of the oil passage 15, and from an oil discharge port formed in the oil passage 15 to the journal of each gear 16 of the main shaft 14 and each oil supply of the synchro mechanism 17. It is designed to supply oil.

The discharge oil passage 6 is provided with a relief valve 7. Since the rotation of the engine is directly transmitted from the input shaft to the countershaft that rotates the oil pump 3, the rotation varies depending on the rotation speed of the engine. Accordingly, the rotation of the oil pump 3 also fluctuates, and the discharge pressure (discharge flow rate) of the oil pump 3 fluctuates. Therefore, a relief valve 7 is provided in the discharge oil passage 6 for controlling the discharge pressure. Excess oil is returned to the inside of the gear case 1 by controlling to a constant pressure (constant flow rate).

Therefore, the present invention relates to a transmission having the above-described structure, which receives the oil pressure of the discharge oil passage 6 downstream of the relief valve 7 and supplies the supply oil passage 8 when the oil pressure exceeds a predetermined value. And a control valve 20 that shuts off oil supply to each of the oil supply sections.

As shown in FIG. 2, a specific structure of the control valve 20 is such that a discharge oil passage 21 and a supply oil passage 22 pass through the block 20a in parallel at a predetermined interval. A valve chamber 24 is provided between the fuel supply passage 21 and the oil supply passage 22.
Are formed. This valve chamber 24 is provided in the discharge oil passage 21.
The opening 25 of φA is open on the side of the oil supply passage 22.
An opening 26 of φB is open on the side. The opening 25 of φA and the opening 26 of φB have a pressure receiving area difference of φA> φB.

As shown in FIG. 3, a pressure receiving surface member 27 for opening and closing the opening 25 of φA is provided in one end of the valve chamber 24.
A valve plate 28 coupled to and integrated with the pressure receiving surface member 27 and a rod 29 at the other end side to protrude and retract from the φB opening 26 to open and close the supply oil passage 22; 30 that presses the spring toward the opening 25 side of φA
And are installed internally. The load of the spring 30 is set as follows. Ps = P × (DE) where Ps: set pressure for blocking the supply oil passage 22 P: pressure in the oil passage D: pressure receiving area of the pressure receiving surface member 27 E: pressure receiving area of the valve plate 28

The control valve 20 having the above structure is disposed between the mounting seat 9 of the oil filter 10 of the gear case 1 and the oil filter 10. Accordingly, the discharge oil passage 21 and the supply oil passage 22 of the control valve 20 are provided at parallel axial intervals corresponding to the discharge oil passage outlet 6a and the supply oil passage inlet 8a that are open to the mounting seat 9. I have. As shown in FIG. 5, through holes 40 for assembling and positioning are formed at the four corners of the block 20a, and are connected to the mounting seat 9 by bolts 50 at the center of the left and right sides. ing.

In this embodiment, the control valve 20 is disposed outside the gear case 1. As another embodiment, as shown by the phantom line in FIG. 1, a discharge oil passage downstream of the relief valve 7 in the gear case 1 is provided. 6 may be arranged between the supply oil passage 8 and the oil case 8 so as to be built in the gear case 1. In this case, the discharge oil passage 6 and the supply oil passage 8 are parallel parts, and the discharge oil passage 21 and the supply oil passage 22 of the control valve 20 have a parallel space corresponding to the discharge oil passage 6 and the supply oil passage 8. Is provided.

Since the present invention has the structure as described above, in the embodiment in which the control valve 20 is disposed between the mounting seat 9 of the oil filter 10 of the gear case 1 and the oil filter 10,
If the viscosity of the oil has not risen and the oil pressure has not exceeded the predetermined value, the oil in the gear case is sucked by the oil pump 3 and discharged to the discharge oil passage 6 to relieve the oil passing through the discharge oil passage 6. The pressure is controlled to a constant value (constant flow rate) by the valve 7, and the oil is filtered into the oil filter 10 through the discharge oil passage 21 of the control valve 20 from the discharge oil passage outlet 6a.
The oil entering the supply oil passage 8 from the supply oil passage inlet 8 a through the supply oil passage 8 through the supply oil passage 8, being guided to the oil muffler 5 by the supply oil passage 8, and penetrating the axis of the main shaft 14 from the oil muffler 5. The oil is supplied to each journal section of each gear 16 and each oil supply section of the synchronization mechanism section 17 through the passage 15.
The oil that has played a role of lubrication in each of the journal portions and the synchro mechanism portion 17 is returned into the gear case 1.

In the other embodiment in which the control valve 20 is incorporated in the gear case 1, similarly to the above, if the oil viscosity does not increase and the oil pressure does not exceed a predetermined value, the oil pump 3 controls the gear case. 1 is sucked, discharged to the discharge oil passage 6 and passed through the discharge oil passage 6 to the relief valve 7.
At a constant pressure (constant flow rate) through the discharge oil passage 21 of the control valve 20 to be taken into the oil filter 10 from the discharge oil passage outlet 6a and filtered. The oil filtered by the oil filter 10 The oil passage 15 enters the supply oil passage 8 from the supply oil passage inlet 8 a through the supply oil passage 22, is guided to the oil muffler 5 by the supply oil passage 8, and penetrates the axis of the main shaft 14 from the oil muffler 5. To the respective journal portions of the respective gears 16 and the respective lubrication portions of the synchronization mechanism portion 17. The oil that played a role of lubrication in each journal section and the synchro mechanism section 17 is supplied to the gear case 1.
Will be returned within.

On the other hand, when the viscosity of the oil at the time of cold is increasing, the oil passing through the discharge oil passage 6 is supplied to the relief valve 7.
The pressure becomes higher than the control capability of the pressure drop. When the oil viscosity is 1000 mm ² / s and the pressure in the pipeline exceeds 588 Pa and the shift operation force is increased as described above, the control valve 20 is connected to the mounting seat 9 of the oil filter 10 of the gear case 1 and the oil. In any of the embodiments disposed between the filter 10 and the other embodiment incorporated in the gear case 1, the high pressure of the oil passing through the discharge oil passage 21 of the control valve 20 is applied to the pressure receiving surface member 2 through the opening 25 of φA.
7, the pressure receiving surface member 27 retreats as shown in FIG. 4 against the set load of the spring 30.

By the retreating movement of the pressure receiving surface member 27, the valve plate 28 integrated with the pressure receiving surface member 27 and the rod 29 projects from the φB opening 26 into the supply oil passage 22 to close the supply oil passage 22. I do. By closing the supply oil passage 22, the flow of the high-pressure oil to the supply oil passage 8 downstream of the supply oil passage 22 is cut off, and the supply of the oil to each oil supply unit is stopped. The pressure in the pipeline when the flow of the high-pressure oil to the supply oil passage 8 is cut off, that is, the predetermined value of the high pressure exceeds 392 to 588 Ps.

The control valve 20 stops the supply of high-pressure oil to each oil supply section, thereby supplying oil having high viscosity and high pressure at low temperatures to deteriorate shift operability. To ensure smooth and light shifting operability.

The relationship between the transmission oil temperature and the maximum operating force is clarified by the cliff shown in FIG. In the graph of FIG. 6, the horizontal axis is the transmission oil temperature, and the vertical axis is the maximum operating force. Line A is the average curve of various conventional mechanisms, B
The line indicates an ideal curve, and the line C indicates a curve according to the mechanism of the present invention. As is clear from this graph, the conventional mechanism has a large operating force at low temperatures, but the mechanism of the present invention has a small maximum operating force close to an ideal curve, indicating the effectiveness of the present invention.

The time during which the supply of oil to each oil supply unit by the control valve 20 is shut off is about 5 to 6 minutes when the oil temperature rises and the viscosity drops. The relief valve 7 functions to reduce the oil pressure to a predetermined value or less, and the pressure receiving surface member 27 moves forward by the set load of the spring 30 to close the opening 25 of φA. The oil supply passage 22 is opened by being drawn into the opening 26 of φB, and the oil is circulated through the oil supply passage 8 and the supply to each oil supply unit is started.

Even if the supply of oil to the respective oil supply units is shut off, the oil in the gear case 1 is scooped by a plurality of gears on the counter shaft by the rotation of the counter shaft. Since the fuel is scattered toward each refueling part, the lubrication of each refueling part is maintained for a short time, so that no trouble is caused.

[0028]

As described above, according to the present invention, the shift operation immediately after the start of the engine in a state where the viscosity is high at low oil temperature and the pressure in the pipeline is high in cold weather is smooth and light. be able to. In addition, the mechanism can be realized only by adding a control valve to the conventional transmission structure, and there is no need to change the design of the transmission structure, so that a low-cost and practical transmission lubrication mechanism can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a transmission equipped with the mechanism of the present invention.

FIG. 2 is a sectional view of a control valve.

FIG. 3 is a perspective view of a pressure receiving surface member and a valve plate.

FIG. 4 is a sectional view showing an operation state of a control valve.

FIG. 5 is a perspective view of a control valve.

FIG. 6 is a graph showing the relationship between oil temperature and maximum operating force.

FIG. 7 is a perspective view of a conventional general transmission.

FIG. 8 is a sectional view of a main part of a conventional general transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gear case 2 Strainer 3 Oil pump 5 Oil muffler 6 Discharge oil passage 6a Discharge oil passage outlet 7 Relief valve 8 Supply oil passage 8a Supply oil passage inlet 9 Mounting seat (of oil filter) 10 Oil filter 20 Control valve 20a Block 21 Discharge oil Passage 22 Supply oil passage 24 Valve chamber 25 φA opening 26 φB opening 27 Pressure receiving surface member 28 Valve plate 29 Rod 30 Spring

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Yoshihiro Wada 3-1-1, Hinodai, Hino-shi, Tokyo Hino Motor Co., Ltd. F-term (reference) 3H059 BB16 CA05 CB15 CD04 DD01 EE01 FF03 FF13 3J063 AC03 BA11 BB21 BB50 CA01 XD03 XD23 XD62 XD71 XE04 XE14 XF22

Claims (4)

[Claims] 1. An oil filter attached to an outer surface of a gear case through a discharge oil passage provided with a relief valve for controlling oil at a constant pressure by sucking oil in a gear case by an oil pump, and supplying oil from the oil filter. In the lubrication mechanism of the transmission that supplies the oil to each oil supply section, the hydraulic pressure of the discharge oil passage downstream of the relief valve is received, and when the hydraulic pressure exceeds a predetermined value of a high pressure that cannot be controlled by the relief valve, the supply is performed. A control valve for opening and closing the oil passage, wherein when the viscosity of the oil at a low temperature is high and a high pressure exceeds a predetermined value, the supply oil passage is closed to shut off oil supply to each of the oil supply units. A lubrication mechanism for a transmission. 2. The oil in the gear case is taken in by an oil filter attached to the outer surface of the gear case by a discharge oil passage provided with a relief valve for controlling the oil at a constant pressure by sucking the oil in the gear case. In the lubrication mechanism of the transmission that supplies the oil to each refueling unit, when the hydraulic pressure of the discharge oil passage downstream of the relief valve is received and the hydraulic pressure exceeds a predetermined value of a high pressure that cannot be controlled by the relief valve, the vehicle moves backward. When the oil pressure is equal to or less than a predetermined value, a pressure receiving surface member that advances by a spring and returns to its original position, and the supply oil passage that is formed integrally with the pressure receiving surface member and that opens and closes by retreating and moving forward. A control valve consisting of a valve plate that is closed, and when the oil viscosity at a low temperature is high and a high pressure exceeds a predetermined value, the supply oil passage is closed. Serial transmission lubrication mechanism, characterized in that so as to shut off the oil supply to the oil supply portion. 3. The control valve according to claim 1, wherein a control valve is arranged between the oil filter and the discharge oil passage outlet and the supply oil passage inlet provided in the oil filter mounting portion of the gear case. Transmission lubrication mechanism. 4. A lubrication mechanism for a transmission according to claim 1, wherein a control valve is disposed between a discharge oil passage and a supply oil passage downstream of the relief valve in the gear case. .