JP2004270837A - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent transmission efficiency of a transmission mechanism of a traveling system from degrading while securing stored oil level in a transmission equipped with the transmission mechanism of the traveling system and a housing for storing the transmission mechanism of the traveling system and capable of storing oil. <P>SOLUTION: The housing is equipped with a chamber of the traveling system for storing the transmission mechanism of the traveling system and a reservoir chamber separately provided from the chamber of the traveling system. The reservoir chamber is structured so that part of the stored oil is transported from the chamber of the traveling system by rotation movement of the transmission mechanism of the traveling system and is enabled to temporarily store the transported stored oil. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission that accommodates a traveling system transmission mechanism and has a housing capable of storing oil therein.
[0002]
[Prior art]
It is conventionally known that hydraulic oil used for various hydraulic mechanisms is stored in a housing that accommodates a traveling system transmission mechanism from a drive source to a drive wheel.
As described above, by using the housing as the storage space for the hydraulic oil, it is possible to reduce the cost and the size of the transmission itself by eliminating or minimizing the storage tank.
[0003]
However, the conventional transmission was insufficient in the following points.
That is, the oil stored in the housing is used as hydraulic oil for various hydraulic mechanisms provided in the vehicle. Therefore, when the housing is also used as a storage tank, it is necessary to store a sufficient amount of oil in the housing to prevent the hydraulic mechanism from running out of oil.
On the other hand, the oil stored in the housing becomes a load on the traveling system transmission mechanism housed in the housing. Therefore, storing a large amount of oil in the housing is not preferable from the viewpoint of the transmission efficiency of the traveling system transmission mechanism.
[0004]
As described above, it is preferable to store a large amount of oil in the housing from the viewpoint of supply of hydraulic oil to the hydraulic mechanism, and from the viewpoint of driving efficiency of the traveling system transmission mechanism, it is preferable to store the oil in the housing. There is a conflicting desire to minimize the amount.
In this regard, the conventional transmission has not been adequately considered.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and in a transmission including a traveling system transmission mechanism and having a housing capable of storing hydraulic oil therein, a sufficient amount of actuation is provided in the housing. An object is to store oil and effectively prevent the transmission efficiency of the traveling-system transmission mechanism from deteriorating.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a traveling system transmission mechanism for transmitting a driving force from a driving source to a driving axle, and a housing accommodating the traveling system transmission mechanism and capable of storing oil therein. Wherein the housing includes a traveling system chamber that houses the traveling system transmission mechanism, and a reservoir chamber that is a separate room from the traveling system chamber, wherein the reservoir chamber is configured to rotate the traveling system transmission mechanism. The transmission is configured so that a part of the stored oil is transferred from the traveling system room, and the transferred stored oil can be temporarily held.
Preferably, an orifice is provided in a partition that defines the traveling system chamber and the reservoir chamber.
[0007]
In one aspect, the transmission further includes a PTO transmission mechanism that outputs a driving force from a driving source to the outside of the housing.
The PTO transmission mechanism includes a PTO transmission shaft operatively connected to the drive source, and a PTO transmission unit operatively connected to the transmission shaft.
The housing has a PTO system chamber for accommodating the PTO transmission unit, and the PTO system chamber functions as the reservoir chamber.
[0008]
In another aspect, the reservoir chamber is provided at an upper portion of the traveling system chamber so as to be able to temporarily hold stored oil that is scooped up by the rotational movement of the traveling system transmission mechanism.
[0009]
In order to achieve the above object, the present invention further provides a traveling system transmission mechanism for transmitting a driving force from a driving source to a driving axle, a PTO system transmitting mechanism for outputting a driving force from the driving source to the outside, A transmission that accommodates a traveling transmission mechanism and a PTO transmission mechanism and that includes a housing capable of storing oil therein.
The PTO transmission mechanism includes a PTO transmission shaft operatively connected to a drive source, a PTO output shaft for outputting power to the outside, and a PTO transmission unit disposed between the PTO transmission shaft and the PTO output shaft. And
The housing has a partition that houses the traveling system transmission mechanism and separates the internal space into a traveling system room in which the PTO transmission shaft is inserted and a PTO system chamber that houses the PTO transmission unit. I have.
The partition wall allows a part of the oil stored in the traveling system chamber to flow into the PTO system chamber due to the rotational movement of the transmission unit in the traveling system transmission mechanism, and flows into the PTO system chamber. An orifice for gradually returning the drained oil to the traveling system chamber.
[0010]
In one aspect, the traveling-system transmission mechanism includes a differential gear device including a ring gear that rotates around a rotation axis along a vehicle width direction as a part of the transmission unit.
In this aspect, the partition extends in the vehicle width direction such that the traveling system chamber and the PTO system chamber are arranged in series from one side in the vehicle longitudinal direction to the other side, and by the rotational motion of the ring gear, A part of the stored oil in the traveling system room is configured to flow into the PTO system room.
[0011]
For example, the partition is configured such that oil scooped up by the ring gear can flow into the PTO-based chamber beyond the upper end of the partition.
Alternatively or additionally, the partition has a suction port along an outer peripheral surface of the ring gear so that oil can flow from the traveling system chamber to the PTO system chamber by a pump effect due to rotation of the ring gear. obtain.
[0012]
In another aspect, the traveling system transmission mechanism has, as a part of the transmission unit, a gear train that meshes with each other, and oil flows from the traveling system chamber into the PTO system chamber due to a pump effect of the gear train. It is configured as follows.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, preferred embodiments of a transmission according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic transmission diagram of a transmission 1A according to the present embodiment.
[0014]
As shown in FIG. 1, the transmission 1A includes a traveling system transmission mechanism that transmits a driving force from a driving source (not shown) to a driving axle 100, and a housing 10 that houses the traveling system transmission mechanism. I have.
[0015]
The traveling system transmission mechanism includes a forward / reverse switching hydraulic mechanism 110, a transmission hydraulic mechanism 120 such as HI / LO, a mechanical main transmission mechanism 130, a mechanical auxiliary transmission mechanism 140, and a differential gear mechanism 150. Have.
In the present embodiment, the traveling system transmission mechanism further includes a four-wheel drive power take-out hydraulic mechanism 160.
The four-wheel drive force take-out hydraulic mechanism 160 is used when driving other wheels (not shown) in addition to the constantly driven drive wheels 100 (rear wheels in the illustrated embodiment), and is preferable. Can be selectively attached to the housing 10.
[0016]
The housing 10 is capable of storing oil in at least a part of the internal space.
In the present embodiment, the housing 10 includes a front housing 20, a middle housing 30, and a rear housing 40 connected in series along the longitudinal direction of the vehicle.
The front housing 20, the middle housing 30, and the rear housing 40 are connected to each other so that oil can freely flow therethrough. That is, each of these housings is provided with an opening at the end facing each other, and the oil can freely flow through the opening.
[0017]
More specifically, the front housing 20 includes a dry chamber 21 that accommodates a flywheel 200 operatively connected to a drive source, and is located downstream of the dry chamber 21 in the transmission direction. And a first oil chamber 22 that accommodates the transmission hydraulic mechanism 120.
[0018]
The middle housing 30 has a second oil chamber 31 that houses the main transmission mechanism and a third oil chamber 32 that houses the sub transmission mechanism.
The four-wheel drive power take-out hydraulic mechanism 160 is detachably attached to the middle housing 30.
[0019]
The rear housing 40 includes a fourth oil chamber 41 that houses the differential gear mechanism 150 and a PTO system chamber 42 that houses a PTO transmission unit 330 of a PTO transmission mechanism described below.
Specifically, the rear housing 40 has a partition 43, and the fourth oil chamber 41 and the PTO system chamber 42 are separated by the partition 43.
[0020]
In the present embodiment, of the internal space of the housing 10, a space formed by the first oil chamber 22, the second oil chamber 31, the third oil chamber 32, the fourth oil chamber 41, and the PTO system chamber 42. However, it is a storage space in which hydraulic oil can be stored.
[0021]
The transmission 1A according to the present embodiment includes a PTO transmission mechanism that outputs a driving force from a driving source to the outside, in addition to the traveling transmission mechanism.
The PTO transmission mechanism is disposed between the PTO transmission shaft 310 operatively connected to a drive source, a PTO output shaft 320 for outputting power to the outside, and the PTO transmission shaft 310 and the PTO output shaft 320. And a PTO transmission unit 330.
[0022]
The PTO transmission shaft 310 has one end operatively connected to the drive source in the front housing 20 and the other end penetrating through the front housing 20 and the middle housing 30 to form the rear housing 40. Of the PTO system chamber 42 of FIG.
In the present embodiment, a part of the transmission shaft in the traveling system transmission mechanism is a hollow shaft, and the PTO transmission shaft 310 is inserted through the hollow shaft to reduce the size of the transmission itself.
[0023]
The PTO output shaft 320 is supported by the housing 10 such that one end thereof extends into the PTO system chamber 42 and the other end extends outward from the housing 10.
In this embodiment, the housing 10 further includes a lid member 50 for closing a rear opening of the rear housing 40, and the PTO output shaft 320 is supported by the lid member 50 and the partition 43. Have been.
[0024]
The PTO transmission unit 330 operatively connects the PTO transmission shaft 310 and the PTO output shaft 320 in the PTO system chamber 42.
Preferably, the PTO transmission unit 330 may include a PTO clutch 335 for turning ON / OFF power transmission from the PTO transmission shaft 310 to the PTO output shaft 320.
More preferably, the PTO transmission unit 330 may include a PTO brake (not shown) that operatively applies a braking force to the PTO output shaft 320 in conjunction with the OFF operation of the PTO clutch 335.
[0025]
Thus, in the transmission 1A according to the present embodiment, the storage formed by the first oil chamber 22, the second oil chamber 31, the third oil chamber 32, the fourth oil chamber 41, and the PTO system chamber 42. In the space, the traveling system transmission mechanism and the PTO transmission unit 330 are respectively housed on one side and the other side with the partition 43 interposed therebetween.
That is, the partition 43 divides the storage space into the traveling system room 11 in which the traveling system transmission mechanism is housed and the PTO system room 12 in which the PTO transmission unit 330 is housed.
[0026]
In the transmission 1A according to the present embodiment, in addition to the above-described configuration, a part of oil stored in the traveling system chamber 11 is partially removed by the rotation of the rotating body in the traveling system transmission mechanism. 12, and the transferred stored oil is temporarily held in the PTO system chamber 12 and then returned to the traveling system chamber 11.
[0027]
FIG. 2 is an enlarged schematic diagram of a portion II in FIG.
As shown in FIG. 2, the partition 43 is disposed close to the ring gear 151 of the differential gear mechanism 150, and a part of the stored oil scraped up by the rotation of the ring gear 151 is used for the PTO system chamber 12. The height is such that it can enter.
That is, the partition wall 43 is configured such that the oil (see the dashed arrow F) lifted by the rotation of the ring gear 151 (see the arrow D) is transferred from the traveling system room 11 to the PTO system room 12 across the partition wall 43. The relative position with respect to the ring gear 151 is set.
[0028]
Further, the partition wall 43 has an orifice 44 for gradually returning the stored oil in the PTO system chamber 12 to the traveling system chamber 11.
Preferably, the opening width of the orifice 44 is adjustable so that the amount of oil returned from the PTO system chamber 12 to the traveling system chamber 11 can be appropriately set.
[0029]
Note that the orifice 44 may be an insertion hole for the strainer 210 (see FIG. 3).
That is, the strainer 210 provided in the housing 10 can be extended to the PTO system chamber 12, and the gap 45 between the outer peripheral surface of the strainer 210 and the partition wall 43 can be used as the orifice 44 ( (See FIG. 3).
[0030]
As described above, in transmission 1A according to the present embodiment, PTO transmission unit 330 is accommodated from traveling system room 11 in which the traveling system transmission mechanism is accommodated by the rotational motion of the rotating body in the traveling system transmission mechanism. A part of the stored oil is transferred to the PTO chamber 12, and the transferred stored oil is temporarily held in the PTO system chamber 12, and then returned to the traveling system chamber 11, Thus, it is possible to effectively prevent deterioration of the transmission efficiency of the traveling system transmission mechanism while storing a sufficient amount of oil without running out of oil.
Preferably, a port for returning oil from various hydraulic mechanisms such as HST to the storage space can be provided so as to open to the PTO system chamber 12. Thereby, the amount of oil stored in the traveling system chamber 11 can be reduced more reliably.
[0031]
In particular, since the transfer of the oil from the traveling system chamber 11 to the PTO system chamber 12 is performed by the rotational motion of the rotating body in the traveling system transmission mechanism, the traveling system chamber is changed according to the traveling speed of the vehicle. The transfer amount of the oil from 11 to the PTO system chamber 12 fluctuates.
That is, as the traveling speed of the vehicle increases, the amount of oil transferred from the traveling system room 11 to the PTO system room 12 increases, and the amount of oil stored in the traveling system room 11 decreases.
Therefore, at the time of high-speed traveling where the transmission efficiency of the traveling system transmission mechanism is particularly problematic, it is possible to more effectively prevent the transmission efficiency of the traveling system transmission mechanism from deteriorating.
When the vehicle is traveling at high speed, the power transmission mechanism of the PTO system is normally in a power cutoff state, so that an increase in the amount of oil stored in the PTO system chamber 12 does not pose a problem.
[0032]
In the present embodiment, the traveling system chamber 11 and the PTO system chamber 12 are separated by the partition 43 that supports the PTO transmission shaft 310 and the PTO output shaft 330. Then, power for transferring oil from the traveling system chamber 11 to the PTO system chamber 12 is obtained from rotation of the traveling system transmission mechanism.
That is, the transmission 1 </ b> A according to the present embodiment can achieve the above-described effects without substantially including an additional member as compared with the conventional transmission.
[0033]
In the present embodiment, the oil is transferred from the traveling system chamber 11 to the PTO system chamber 12 by scraping up the oil accompanying the rotational movement of the ring gear 151 in the differential gear mechanism 150. Alternatively, it is also possible to adopt a configuration in which oil is transferred from the traveling system chamber 11 to the PTO system chamber 12 by a pump effect due to the rotational movement of the ring gear 151 (see FIG. 4).
That is, the partition 43 can be provided with a suction port 48 that allows the oil to flow from the traveling system chamber 11 into the PTO system chamber 12 by the pump effect of the ring gear 151.
[0034]
Embodiment 2 FIG.
Hereinafter, a transmission according to another embodiment of the present invention will be described with reference to the accompanying drawings.
The transmission 1B according to the present embodiment is substantially the same as the first embodiment except that the configuration for transferring oil from the traveling system chamber 11 to the PTO system chamber 12 is different. .
Therefore, in the present embodiment, the same or corresponding members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0035]
FIG. 5 is a partial vertical cross-sectional schematic diagram of transmission 1B according to the present embodiment, and is a cross-sectional schematic diagram along a cross-section corresponding to line VV in FIG.
The transmission 1B is configured to transfer oil from the traveling system chamber 11 to the PTO system chamber 12 by utilizing a pump effect of a gear train configured to always mesh in the traveling system transmission mechanism. I have.
[0036]
In the present embodiment, as shown in FIG. 5, a drive gear 161 and a driven gear 162 in the four-wheel drive power take-out hydraulic mechanism 160 are used as the gear train.
Then, a part of the stored oil in the traveling system chamber 11 is transferred to the PTO system chamber 12 via the external pipe 220 by utilizing the pump effect accompanying the rotation of the driving gear 161 and the driven gear 162. .
[0037]
Also in the transmission 1B having such a configuration, the same effect as in the first embodiment can be obtained.
[0038]
Embodiment 3 FIG.
Hereinafter, a transmission according to still another embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 6 is a partial vertical cross-sectional schematic view of a transmission 1C according to the present embodiment.
[0039]
As described above, in the first and second embodiments, the storage space of the housing 10 is divided into the traveling system room 11 in which the traveling system transmission mechanism is housed and the PTO system room 12 in which the PTO transmission unit 330 is housed. Are separated. Further, the PTO system chamber 12 is also used as a reservoir chamber for temporarily storing the oil stored in the traveling system chamber 11.
[0040]
On the other hand, in the present embodiment, a dedicated holding room 12 'is used as the reservoir room.
The holding chamber 12 'receives the stored oil in the traveling system chamber 11 which is scooped up by the rotational motion of the traveling system transmission mechanism at a position isolated from the traveling system transmission mechanism, and gradually receives the received stored oil. It is configured to be able to return to the traveling system room 11.
[0041]
As shown in FIG. 6, in the present embodiment, a bottom wall 43a extending inward from a side wall of the housing 10 and a side wall 43b extending upward from a free end of the bottom wall 43a. Thereby, the storage chamber 15 'is formed.
An orifice 44 is provided on the bottom wall 43a.
[0042]
Also in the transmission 1C having such a configuration, the same effects as those in the first and second embodiments can be obtained.
[0043]
【The invention's effect】
As described above, according to the transmission of the present invention, it is possible to effectively prevent deterioration of the transmission efficiency of the traveling system transmission mechanism due to the stored oil while storing a sufficient amount of oil in the housing.
[Brief description of the drawings]
FIG. 1 is a schematic transmission diagram of a transmission according to an embodiment of the present invention.
FIG. 2 is an enlarged schematic view of a portion II in FIG.
FIG. 3 is an enlarged schematic view of a portion II in FIG. 1, showing a modified example of the orifice.
FIG. 4 is an enlarged schematic view of a portion II in FIG. 1, showing a modification of the oil transfer means.
FIG. 5 is a partial vertical cross-sectional schematic view of a transmission according to another embodiment of the present invention, and is a cross-sectional schematic view along a cross-section corresponding to line VV in FIG.
FIG. 6 is a partial vertical cross-sectional schematic view of a transmission according to still another embodiment of the present invention.
[Explanation of symbols]
1A to 1C Transmission 10 Housing 11 Running system room 12 PTO system room 43 Partition wall 44 Orifice 150 Differential gear device 151 Ring gear 310 PTO transmission shaft 320 PTO output shaft 330 PTO transmission unit

Claims (9)

A traveling system transmission mechanism for transmitting a driving force from a driving source to a driving axle;
A housing housing the traveling system transmission mechanism and capable of storing oil therein,
The housing includes a traveling system room that houses the traveling system transmission mechanism, and a reservoir room that is a separate room from the traveling system room.
The reservoir chamber is configured such that a part of the stored oil is transferred from the traveling system chamber by the rotational movement of the traveling system transmission mechanism, and the transferred stored oil can be temporarily held. A transmission characterized in that: The transmission according to claim 1, wherein an orifice is provided in a partition that defines the traveling system chamber and the reservoir chamber. A PTO transmission mechanism that outputs a driving force from a driving source to the outside of the housing,
The PTO transmission mechanism includes a PTO transmission shaft operatively connected to the drive source, and a PTO transmission unit operatively connected to the transmission shaft.
The housing has a PTO system chamber that houses the PTO transmission unit,
3. The transmission according to claim 1, wherein the PTO system chamber functions as the reservoir chamber. The said reservoir room is provided in the upper part of the said driving | running | working system chamber so that the storage oil scooped up by the rotational movement of the said driving | running | working system transmission mechanism can be temporarily held, The said driving | running | working system chamber is provided. Transmission. A traveling system transmission mechanism for transmitting a driving force from a driving source to a driving axle;
A PTO transmission mechanism for outputting the driving force from the driving source to the outside,
A housing housing the traveling transmission mechanism and the PTO transmission mechanism, and having a housing capable of storing oil therein;
The PTO transmission mechanism includes a PTO transmission shaft operatively connected to a drive source, a PTO output shaft for outputting power to the outside, and a PTO transmission unit disposed between the PTO transmission shaft and the PTO output shaft. And having
The housing has a partition that houses the traveling system transmission mechanism and separates the internal space into a traveling system room in which the PTO transmission shaft is inserted and a PTO system chamber that houses the PTO transmission unit. Yes,
A part of the oil stored in the traveling system chamber flows into the PTO system chamber due to the rotational movement of the transmission unit in the traveling system transmission mechanism,
A transmission, wherein the partition wall is provided with an orifice for gradually returning oil flowing into the PTO system chamber to the traveling system chamber. The traveling system transmission mechanism has a differential gear device including a ring gear that rotates around a rotation axis along a vehicle width direction as a part of the transmission unit,
The partition wall extends in the vehicle width direction such that the traveling system room and the PTO system room are arranged in series from one side in the vehicle longitudinal direction to the other side,
The transmission according to claim 5, wherein a part of the stored oil in the traveling system chamber flows into the PTO system chamber by a rotational motion of the ring gear. 7. The transmission according to claim 6, wherein the partition is configured such that oil scooped up by the ring gear can flow into the PTO-based chamber beyond an upper end of the partition. The partition wall has a suction port along an outer peripheral surface of the ring gear so that oil can flow from the traveling system chamber into the PTO system chamber by a pump effect due to rotation of the ring gear. Item 8. The transmission according to item 6 or 7. The traveling system transmission mechanism has a gear train that meshes with each other as a part of the transmission unit,
The transmission according to any one of claims 5 to 8, wherein oil is supplied from the traveling system chamber to the PTO system chamber by a pump effect of the gear train.

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