JP2008232225A - Breather device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensively constituting breather device for a divided case, for exhibiting the effective function as the breather device with a simple constitution, by using a structure characteristic of the divided case. <P>SOLUTION: An expansion chamber 40 composed of a small chamber opening on the mating face 20 side, is respectively integrally formed in respective divided case unit bodies 2, and one expansion chamber 40 is formed with a small communicating port 41 communicating with an oil storage space 10 in the divided case, and the other expansion case 40 has a breather port 42, and packing 3 is interposed in a mating face 20. Its packing 3 is formed with a communicating hole 30 allowing ventilation to the expansion chamber 40 side having the breather port 42 from the expansion chamber 40 communicating with the oil storage space 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blazer device provided in a divided case that is often used as a transmission case or various transmission cases in various working machines such as a combine or a tractor.

As this type of blazer device, for example, one having the following structure is conventionally known.
[1] A blazer pipe is inserted into a plug body for an oil filler opening provided in the upper wall of the gear mission case, and the air in the mission case is vented (see, for example, Patent Document 1).
[2] A communication hole is provided in the upper wall of the transmission case, and a dedicated blazer device is installed to vent the air through the communication hole. The blazer device has an expansion chamber inside and can be separated into gas and liquid. (For example, Patent Document 2).

JP-A-8-93888 (paragraph [0011], FIG. 2) Japanese Unexamined Patent Publication No. 7-32895 (paragraph [0010], paragraph [0012], FIG. 2 and FIG. 3)

As described in Patent Document 1, in a structure in which a blazer pipe is inserted into a plug body with respect to a fuel filler opening so that the plug body can be used as means for attaching the blazer pipe, the structure of the blazer device is simplified. Although useful for cost reduction, it is necessary to keep a considerable distance from the oil surface to the upper end of the blazer pipe in order to suppress the ejection of oil from the blazer pipe.
Therefore, in a structure in which the oil level is set near the upper part in the case, the blazer pipe is a projection that protrudes largely upward from the upper surface of the gear mission case, and thus there is a problem that it is difficult to apply.

Further, as described in Patent Document 2, in a structure in which a dedicated blazer device is mounted on the upper wall of the transmission case, the blazer device has a labyrinth structure or an expansion chamber so that oil can be prevented from being ejected. Since it is configured, it is not necessary to provide a large protrusion on the upper surface side of the case.
However, since such a dedicated blazer device is used, there is a problem that the cost cannot be reduced accordingly.

  An object of the present invention is to provide a blazer device for a split case that uses a structure peculiar to a split case to exhibit an effective function as a blazer device with a simple configuration and can be configured at low cost. Yes.

The technical means of the present invention taken in order to achieve the above object has the following structural features and operational effects.
[Solution 1]
As described in claim 1, the present invention provides a blazer device provided in a divided case formed by joining a plurality of divided case units at a mating surface.
Each of the divided case units on both sides of the mating surface is integrally formed with an expansion chamber consisting of a small chamber whose mating surface is open, and one expansion chamber has a small communication port communicating with the oil storage space in the split case. And forming a blazer port in the other expansion chamber, partitioning the expansion chambers on both sides with a mating surface by interposing a packing on the mating surface, and extending the blazer from the expansion chamber communicating with the oil storage space to the packing. A communication hole that allows ventilation to the expansion chamber side provided with a mouth is formed.

[Action and effect]
According to the above configuration, when configuring the split case, it is possible to configure the blazer device by using the packing that is always attached to the case mating surface, simply by forming the expansion chamber integrally within the case. It becomes.
Therefore, the blazer apparatus having the labyrinth structure and the expansion chamber can be configured without adding a special member as the blazer apparatus, and there is an advantage that cost reduction can be achieved with a simple configuration.

[Solution 2]
As described in claim 2, it is preferable to provide an expansion chamber in a space formed between the outer wall on the upper side of each divided case unit and the transmission member disposed in the vicinity thereof.

[Action and effect]
According to the above configuration, the entire divided case is formed by forming an expansion chamber using a so-called empty space between the outer wall on the upper side of each divided case unit and the transmission member disposed in the vicinity thereof. There is an advantage that a high-functional blazer device can be configured in a compact manner without the need to change the shape or dimensions of the device.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall configuration of split case]
FIG. 1 shows a transmission case 1 used in an ordinary combine as an example of a divided case to which the blazer device of the present invention is applied.
The transmission case 1 is constituted by a combination of a pair of left and right divided case units 2 and 2 and is bolted to a mating surface 20 of a divided portion indicated by a dividing line y in the figure with a packing 3 interposed. is there.

The transmission case 1 is supported by connecting a hydrostatic continuously variable transmission (HST) 5, which is configured as a separate case, to the upper side, and is supported by an axle 6 on the lower side.
The hydrostatic continuously variable transmission 5 includes a pump drive shaft and a shaft support portion 21 that extends the transmission case 1 above one of the left and right divided case units 2. The integral input shaft 50 is inserted and supported by the upper end portion of the transmission case 1. The traveling pulley power that is branched from the working power from the engine (not shown) is transmitted to the input pulley 51 provided on the input shaft 50 by a belt.

  An output shaft 52 integral with the motor shaft of the hydrostatic continuously variable transmission 5 is inserted into the upper part of the transmission case 1 and is shifted by the hydrostatic continuously variable transmission 5 with respect to the transmission mechanism in the transmission case 1. Power is input. The motive power transmitted from the hydrostatic continuously variable transmission 5 is gear-shifted into two steps of high and low by the auxiliary transmission mechanism 13 as a transmission mechanism installed in the transmission case 1, and then via the left and right side clutches 14. The right and left axles 6 are branched and transmitted to the left and right crawler travel devices.

The outline of the speed change mechanism provided in the transmission case 1 is as shown in FIGS.
That is, a first shaft 61, a counter shaft 62, a second shaft 63, and a pair of left and right axles 6 are horizontally supported on the transmission case 1, and the first shaft 61 and the counter shaft 62 extend between the first shaft 61 and the counter shaft 62. A sub-transmission mechanism 13 capable of shifting by a gear shift operation is provided in two stages.

A center gear CG formed by integrating a large-diameter transmission gear G5 that can be engaged with the small-diameter gear G3 and a small-diameter transmission gear G6 that can be engaged with the large-diameter gear G4 is loosely supported at the left and right central portions of the counter shaft 62. Has been.
The shift gear SG is shifted to the right in the drawing and the small-diameter gear G3 is selectively engaged with the large-diameter transmission gear G5, so that “low speed” appears. The shift gear SG is shifted to the left in the drawing and the large-diameter gear G4. Is selectively engaged with the small-diameter transmission gear G6, and "high speed" appears, and "neutral" appears when the shift gear SG is shifted to an intermediate position not engaged with the center gear CG.
A parking brake PB is provided at one of the pivotal support portions of the first shaft 61 equipped with the shift gear SG. This parking brake PB is configured to prevent the shift gear SG from rotating and to fix the lower transmission side.

On the left and right sides of the counter shaft 62, a clutch gear G7 constituting the side clutch 14 is loosely supported so as to be slidable in the axial direction, and a pair of output gears G8 engaged with the clutch gears G7 are provided on the second shaft 63. Is loosely supported.
When the clutch gear G7 is slid inward, the clutch gear G7 is engaged with the internal gear G9 formed at the center of the center gear CG to bring the clutch into the engaged state, and the clutch gear G7 is slid outward. Thus, a “clutch disengagement” state in which the internal gear G9 is disengaged is provided. Normally, each clutch gear G7 is slidably biased in the “clutch engaged” direction by a spring 68 externally fitted to the counter shaft 62. The clutch gear G7 is configured to be wide, and is always meshed with the output gear G8 in both “clutch engagement” and “clutch disengagement”.
Each output gear G8 is integrally connected to an intermediate small-diameter gear G10 that is loosely supported on the second shaft 63, and each intermediate small-diameter gear G10 is fixed to the inner end of each axle 6 and has a large-diameter reduction gear. G11 is engaged with each other, and the power extracted from each output gear G8 is transmitted to the left and right axles 6 at a reduced speed.

  Near the left and right ends of the counter shaft 62, a side brake SB that acts on the clutch gear G7 is provided. The side brake SB is a multi-plate friction brake in which a friction plate 75 engaged with the outer periphery of the boss portion 69 and a friction plate 77 engaged with the inner periphery of the fixed bearing case 76 are alternately superposed in the axial direction. When the clutch gear G7 is slid further outward beyond the “clutch disengagement” position, the operation plate 71 is pressed against the superimposed friction plates 75 and 77 to frictionally brake the clutch gear G7. Is to be granted.

[Configuration of blazer device]
As shown in the explanatory views of FIGS. 3 and 4, the blazer device 4 of the present invention is mounted on the upper portion of the transmission case 1 that houses the above-described transmission mechanism.

The outer wall 22 on the upper side of each of the left and right divided case units 2, and the transmission members arranged in the vicinity thereof, that is, the output shaft 52, the first shaft 61, gears arranged around the shaft, and the like A partition wall 23 is provided for constituting the expansion chamber 40 together with the outer wall 22 by utilizing an empty space generated between the two.
The expansion chamber 40 provided in each divided case unit 2 is opened on the mating surface 20 side of the transmission case 1, and the oil storage space 10 in the transmission case 1, that is, the above-described various speed change mechanisms and the like is lubricated at other portions. The space enclosed by the oil is surrounded by the partition wall 23 so as to constitute a small compartment that is hermetically partitioned.

The expansion chamber 40 provided in each of the left and right divided case units 2 is divided into left and right by a packing 3 provided on the mating surface 20 of the transmission case 1, and a first extension located on one side of these is divided. On the bottom side of the chamber 40a, a small communication port 41 for ventilation is formed in the portion facing the mating surface 20 by a notch. The other second expansion chamber 40b provided in the split case unit 2 on the opposite side across the packing 3 is provided with a lateral discharge cylinder as a blazer port 42 that allows communication with outside air.
The packing 3 positioned between the two expansion chambers 40a and 40b is provided with the blazer opening 42 from the first expansion chamber 40a communicating with the oil storage space 10 near the outer wall 20 of the transmission case 1. In addition, a communication hole 30 that allows ventilation to the second expansion chamber 40b side is formed.

That is, the blazer device 4 of the present invention utilizes the expansion chambers 40a and 40b provided in the left and right divided case units 2 and the packing 3 positioned between the expansion chambers 40a and 40b. It is configured.
The blazer device 4 configured as described above is configured to supply and discharge air as indicated by arrows in FIG.
That is, when the pressure of the gas on the lower oil storage space 10 side increases due to an increase in the oil temperature or the inclination of the airframe, the gas is pushed into the first expansion chamber 40a above the small communication port 41.
At this time, in the upper first expansion chamber 40a, the pressure is reduced in a space having a larger capacity than that of the small communication port 41, whereby a certain amount of oil is removed from the inflowing gas, and the small communication port 41 is transferred to the oil storage space 10. It becomes possible to return.
And when the internal pressure of the said 1st expansion chamber 40a increased, gas will flow in into the 2nd expansion chamber 40b of the other side via the communicating hole 30 of the packing 3, and it was pressure-reduced in a wide space again, and the oil content was further reduced. Then, it flows out from the blazer opening 42 to the outside.

The second expansion chamber 40b is not formed with a passage for returning the oil produced by gas-liquid separation to the oil storage space 10 in the second expansion chamber 40b. However, most of the oil content is first on the first expansion chamber 40a side. Since it is removed, there is very little possibility that a large amount of oil is stored on the second expansion chamber 40b side.
If a large amount of oil is stored, the blazer opening 42 may be opened and sucked and discharged from the outside, or may be discharged by disassembling the case together with the maintenance of the entire transmission case 1.

  A blazer pipe 43 that projects in a semicircular shape upward is communicated with the discharge cylinder constituting the blazer opening 42. The reason why the bent blazer pipe 43 is connected is to prevent water from entering the transmission case 1 from the outside when the vehicle is washed.

[Other Embodiments]
[1] In the above-described embodiment, the expansion chamber 40 is provided in the space formed between the outer wall on the upper side of each divided case unit 2 and the transmission member disposed in the vicinity thereof. Not limited to this, as long as the oil level is higher than the expected oil level in the oil storage space 10, an appropriate location can be selected and disposed.

[2] The small communication port 41 formed in the first expansion chamber 40a is not limited to a notch with one end opened as shown in the embodiment, and may be a suitably shaped shape such as a round hole. The location can also be freely set as long as the oil stored in the room can be discharged into the oil storage space 10 below.

[3] When the division case is more than two divisions, for example, three divisions or more, an expansion chamber 40 is formed at a location facing the mating surface 20 of each division location, and a communication hole 30 is provided. A blazer device 4 having a labyrinth structure of three or more stages may be configured with the packing 3 interposed.

Longitudinal front view of transmission case Partial cutaway side view of transmission case Operation explanation diagram of blazer device Exploded perspective view showing schematic structure of blazer device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Divided case unit body 3 Packing 4 Blazer apparatus 20 Mating surface 30 Communication hole 40 Expansion chamber 41 Small communication port 42 Blazer port y Dividing line

Claims (2)

A blazer device provided in a split case formed by joining a plurality of split case units at a mating surface,
Each of the divided case units on both sides of the mating surface is integrally formed with an expansion chamber composed of a small chamber whose mating surface is open,
While forming a small communication port that communicates with the oil storage space in the split case in one expansion chamber, the blazer port is provided in the other expansion chamber,
The expansion chambers on both sides are partitioned by the mating surfaces with a packing interposed between the mating surfaces, and the packing allows ventilation from the expansion chamber communicating with the oil storage space to the expansion chamber side provided with the blazer port. A blazer device characterized in that a communication hole is formed.
2. The blazer device according to claim 1, wherein the expansion chamber is provided in a space formed between an outer wall on an upper side of each divided case unit and a transmission member disposed in the vicinity thereof.

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