JPH068951Y2 - Load-bearing device for automatic brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a load-bearing device for an automatic brake, and in particular, is an improvement of the load-bearing device for an automatic brake provided in a rail vehicle.

[Conventional technology]

Generally, a railroad vehicle is provided with a load-applying device for an automatic brake, which is configured to increase / decrease the air pressure sent to a brake cylinder according to the load of a bogie supporting a vehicle body. This load-bearing device is a railway vehicle that uses an air spring that is expensive but has a good cushioning property such as a passenger car, as disclosed in, for example, JP-A-52-122775. It can be used to control the increase / decrease of the air pressure sent to the brake cylinder by directly guiding the air spring pressure to the variable load valve, but it has a low cushioning property such as a freight car but has a low price, such as a coil spring or leaf spring. Railway vehicles that use the bogie pillow springs of the above-mentioned type employ a device that detects the displacement amount of the bogie pillow springs by other means and guides the displacement amount corresponding to the displacement amount to the variable load valve. ing. Specifically, for example, the configuration is as shown in FIG.

That is, a brake pipe BP that is drawn through the vehicle, a brake control device OP that branches from the brake pipe BP to control the air brake of the vehicle, and a supply air reservoir SR that stores pressure air that is the source of the braking force. And a non-return valve CHV for allowing air supply from the brake pipe BP to the supply air reservoir SR during operation and preventing backflow air supply from the supply air reservoir SR to the brake pipe BP during braking, and two carts Two oil side weights OL that measure the height of the bogie pillow springs provided
V, and a variable load valve VLV that amplifies the command air pressure sent from the brake control device OP and controls the increase / decrease of the air pressure sent to the brake cylinder BC based on the operation of the hydraulic side weight device OLV. It And
The oil-type side weight device OLV (see FIG. 8) has a load detection bellows B ₁ that is displaced together with a bogie pillow spring S connected to _one end of the passage A, and a lever fulcrum in the variable load valve VLV connected to the other end of the passage A. A conversion bellows B ₂ that is displaced in conjunction with the position conversion mechanism C is connected, and hydraulic oil is enclosed in the passage A and both bellows B ₁ and B ₂ .

According to such a configuration, during normal operation of the vehicle, pressurized air having a predetermined pressure is supplied from the brake pipe BP to each control air reservoir in the brake control device OP to be accumulated in pressure and via the check valve CHV. Is also sent to the supply air reservoir SR to accumulate pressure. Further, when a brake command is issued, the pressure inside the brake pipe BP is reduced, and the brake control device OP operates accordingly, so that the pressure air in the supply air reservoir SR is transmitted via the brake control device OP to the brake pipe BP. After being converted into the pressure air corresponding to the decompression amount, the air is sent to the variable load valves VLV of the two trucks as the brake command pressure.
On the other hand, the oil-type side weight device OLV operates the lever fulcrum position conversion mechanism C in the variable load valve VLV by moving the hydraulic oil according to the displacement amount of the bogie pillow spring S, that is, the displacement amount of the load detection bellows B _1. Then, the lever fulcrum position is changed, and accordingly, the variable load valve VLV supplies the pressure air corresponding to the command air pressure from the brake control device OP and the movement amount of the hydraulic oil of the oil side weight device OLV. , The air is supplied from the supply air reservoir SR to the brake cylinder BC.

[Problems to be solved by the invention]

By the way, in the conventional load-bearing device for automatic braking, in a structure in which two trucks are provided for each vehicle and two load-bearing valves VLV, VLV are installed correspondingly, Each variable load valve VLV is configured to deliver desired pressure air to each brake cylinder BC based on the operation of the corresponding oil side weight device OLV. Therefore, this load-bearing device operates under uneven load conditions such as a container freight car, that is, under a load condition in which the load acting on one truck and the load acting on the other truck are significantly different. While effective for vehicles that operate at high speed and require large deceleration, install two variable load valves VLV for each vehicle for vehicles that do not operate at high speed and do not require large deceleration. Is not only forced to increase the cost, but is also meaninglessly excessive in terms of performance.

To cope with such a problem, only one variable load valve VLV needs to be installed for one vehicle. In such a case, however, conventionally, one variable load valve VLV is oil-operated. Since only one side weight device OLV is connected, the load applied to one of the two carriages can be detected. For this reason, when the loaded load acts only on one of the trucks and the other truck is not loaded, the oil-type side weight device OLV is temporarily installed on the truck without the loaded load. If so, only an extremely weak braking force is generated when the vehicle is braked, which causes a problem that the braking force is insufficient to smoothly stop the vehicle. On the contrary, when the oil-type side weight device OLV is equipped only on the truck on which the load is acting unevenly, the braking force becomes excessive, and even in this case, it is great for smooth stopping. It becomes an obstacle.

[Means for solving problems]

In view of the above circumstances, the present invention provides a suitable braking force by installing only one variable load valve for one vehicle, regardless of whether or not the load is equally applied to the two vehicles. It was made as a technical problem to realize a load-bearing device for an automatic brake having the above-mentioned novel structure, and the first means is to realize a loading load of a truck equipped with a pillow spring at one end of the passage. Is connected to a load detection bellows that is displaced according to the size of the variable load valve, and the other end is connected to a conversion bellows that is displaced in conjunction with the lever fulcrum position conversion mechanism in the variable load valve. In the variable load device of the automatic brake, which is configured to increase or decrease the air pressure directly sent to the brake cylinder by changing the lever fulcrum position in the variable load valve based on the operation of the side weight device. , One vehicle is provided with a bogie having two pillow springs, two load detection bellows are provided corresponding to the two bogies, and two load detection bellows are connected to each other.
This is where the book passages are gathered into one gathering passage and the conversion bellows is connected to the tip of this gathering passage.

The second means is to equip one vehicle with a trolley provided with two pillow springs, and to provide two load detection bellows corresponding to the two trolleys. Each conversion bellows is connected to the detection bellows via each passage, the two conversion bellows are connected to both ends of the lever arm, and one end is rotatably connected to the center of the lever arm. The other end is connected to the lever fulcrum position conversion mechanism in the variable load valve.

[Action]

According to the above-mentioned first means, when the carrying load acts evenly on the truck equipped with two pillow springs, that is, when half of the total carrying load acts on each truck. ,Part 1
The two load detection bellows are displaced by an amount corresponding to the load of / 2, and the hydraulic oil moves in the two passages according to the displacement amount. In this case, in the two passages, the hydraulic oil moves by an amount corresponding to 1/2 of the total load, whereas in the one collecting passage formed by assembling the two passages, Hydraulic fluid moves by an amount corresponding to the total payload. Therefore, the conversion bellows connected to the tip of the collecting passage is also displaced by an amount corresponding to the entire load, and the displacement also changes the lever fulcrum position conversion mechanism in the variable load valve to change the lever fulcrum position. On the other hand, if the payload is acting on only one of the trucks,
The load detection bellows provided on one of the trucks is displaced by an amount corresponding to the total load, whereas the load detection bellows provided on the other truck is not displaced. Therefore, the hydraulic oil moves only in one of the two passages connected to the load detecting bellows by the amount corresponding to the total load, and accordingly, the total load also in the collecting passage. The hydraulic oil moves by an amount corresponding to the above, which causes the conversion bellows to be displaced and the lever fulcrum position in the variable load valve to be changed in the same manner as described above.

In this way, even if the load acts evenly or unevenly on the truck equipped with two pillow springs, the amount of hydraulic oil corresponding to the total load always moves in the collecting passage. Therefore, the displacement amount of the conversion bellows and the displacement amount of the lever fulcrum position in the variable load valve always correspond to the total load. In other words, the lever fulcrum position in the variable load valve changes depending on the magnitude of the total load, regardless of whether the load is acting unbalancedly.

Also, since the working oil is used as the working fluid, the displacement amount of the pillow spring of the bogie is guided as it is from the load detecting bellows to the conversion bellows through the passage, so that it is compressed as in the case of using air as the working fluid. The force for changing the lever fulcrum position is larger and more accurate than when the air pressure is guided to the conversion bellows.

Further, according to the second means, when the load acts evenly on the two trucks and the two load detection bellows are displaced by an amount corresponding to 1/2 of the total load, The hydraulic oil moves in each passage according to the displacement amount, and accordingly, the two conversion bellows are also displaced by the same size.
Therefore, both ends of the lever arm are also moved by a dimension corresponding to 1/2 of the total load, and the movable member slides by the same dimension, whereby the lever fulcrum position conversion mechanism in the variable load valve is moved. In response to this, the lever support position changes. On the other hand, when the loaded load acts only on one of the trucks, the load detection bellows provided on the one truck is displaced by the amount corresponding to the entire loaded load, while The load detection bellows provided on the truck does not move. Therefore, the hydraulic oil moves only in the passage connected to the one load detection bellows of the two passages, and only one of the two conversion bellows corresponds to the full load. Only the one end portion of the lever arm moves by the same dimension as the displacement amount, and the lever arm is inclined. In this case, since one end of the movable member is rotatably connected to the central portion of the lever arm, the sliding dimension of the movable member is 1/2 of the moving dimension of the lever arm, that is, the total load. The size corresponds to 1/2 of the above, and the sliding of this movable member changes the lever fulcrum position in the variable load valve as described above.

In this way, the movable member must always move by a size corresponding to 1/2 of the total load, regardless of whether the load is evenly or unevenly applied to the bogie equipped with two pillow springs. Therefore, the amount of displacement of the lever fulcrum position in the variable load valve is always half the total load. In other words, similarly to the first means, the lever fulcrum position in the variable load valve changes depending on the magnitude of the total load regardless of whether the load is acting unevenly. Become.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show a first embodiment of the present invention, but the same components as those of the prior art are designated by the same reference numerals as those in FIG. 7 and FIG. 8 and their explanations are omitted. .

As shown in FIG. 1, this first embodiment is different from the conventional one in that the supply air reservoir SR and the variable load valve V for one vehicle are different.
Only one LV is installed, and oil-type side weights OLV, O
This means that the _two passages A ₁ and A ₂ of the LV are gathered into one gathering passage A ₃ , and this gathering passage A ₃ is connected to the variable load valve VLV. Specifically, as shown in FIG. 2, two load detection bellows B ₁ and B ₁ of the oil-type side weight device OLV provided corresponding to the truck equipped with two pillow springs S are provided with two rods each. Of the _two passages A ₁ and A _2
1 and A ₂ are gathered in one gathering passage A ₃ , and a conversion bellows B ₂ which is displaced in conjunction with the lever fulcrum position changing mechanism C in the variable load valve VLV is connected to the tip of this gathering passage A _3. It was done.

According to such a configuration, one of the load detection bellows B ₁
The hydraulic oil that has moved in the passage A ₁ due to the displacement of _{No. 1} and the hydraulic oil that has moved in the passage A ₂ due to the displacement of the other load detection bellows B ₁ merge in the collective passage A ₃ . Therefore, the moving amount of the working oil in the collecting passage A ₃ is the total of the working oil in the _two passages A ₁ and A ₂ . Then, the conversion bellows B ₂ is displaced and the lever fulcrum position conversion mechanism C responds in accordance with the total movement amount of the hydraulic oil, and the lever fulcrum position in the variable load valve VLV changes accordingly. It will be.

FIGS. 3 and 4 show a second embodiment of the present invention, in which the same components as those of the prior art are designated by the same reference numerals as those in FIGS. 7 and 8. The description is omitted.

As shown in FIG. 3, this second embodiment is different from the conventional one in that the supply air reservoir SR and the variable load valve V for one vehicle are different.
Only one LV is installed, and oil-type side weights OLV, O
That is, the two passages A ₁ and A ₂ of the LV are connected to the variable load valve VLV via the lever mechanism X. Specifically, as shown in FIG. 4, the two passages A ₁ and A ₂ are connected to the _two load detection bellows B ₁ and B _1, and the two passages A ₁ and A ₂ are connected to each other.
_1, the tip of the _{A 2} connects the two conversion bellows _B 2, _{B 2,} via a connecting member _X 2, _{X 2} the two conversion bellows _B 2, _{B 2} at both ends of the lever arm _{X 1} Connection (pin connection)
In addition, the other end of the movable member X ₃ whose one end is rotatably connected to the central portion of the lever arm X ₁ is connected to the lever fulcrum position conversion mechanism C in the variable load valve VLV.

According to such a configuration, one of the load detection bellows B ₁
1/2 the displacement of one conversion bellows B _{2 due to} the displacement of
And a half value of the displacement amount of the other conversion bellows B ₂ accompanying the displacement of the other load detection bellows B ₁ are transmitted to the movable member X ₃ , and the corresponding load is applied in response to this total value. Valve VL
The lever fulcrum position within V will change.

FIG. 5 shows a modification of the lever mechanism X in the second embodiment, in which both end portions of the lever arm X ₁ and the two conversion bellows B ₂ , B ₂ are respectively pivot bearings X ₄ , X. It is connected through ₄ .

FIG. 6 also shows a modified example of the lever mechanism X in the second embodiment, in which both ends of the lever arm X ₁ and the two conversion bellows B ₂ , B ₂ are connected via springs X ₅ , X ₅ , respectively. In addition to the above, the spring X ₆ is also provided between the central portion of the lever arm X ₁ and one end of the movable member X ₃ , and both are rotatably connected.

[Effect of device]

As described above, according to this invention,
Since only one variable load valve needs to be installed, the cost can be reduced and the load is evenly applied to the truck equipped with two pillow springs. Since the lever fulcrum position in the variable load valve changes according to the size of the total load, a braking force of a suitable magnitude corresponding to the total load can be obtained, and It will be stopped smoothly.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of the first embodiment, FIG. 3 is an overall configuration diagram showing a second embodiment of the present invention, FIG. 4 is an enlarged view of a main part of the second embodiment, and FIGS. 5 and 6 are levers used in the second embodiment. It is a principal part enlarged view which shows the modification of a mechanism. Further, FIG. 7 is an overall configuration diagram showing a conventional example, and FIG. 8 is an enlarged view of a main part of the conventional example. A ₁ , A ₂ ... Passage, A ₃ ... Collecting passage, B ₁ ... Load detection bellows, B ₂ ... Conversion bellows, C ... Lever fulcrum position conversion mechanism, OLV ... Weight measuring device, BC ... Brake cylinder, VLV
... load-bearing valve, X ₁ ... lever arm, X ₃ ... movable member.

Claims (2)

[Scope of utility model registration request] 1. A load detecting bellows having a pillow spring at one end of the passage, which is displaced according to the size of the load of a bogie, is connected to the other end of the passage, and the other end is displaced in conjunction with a lever fulcrum position conversion mechanism in the variable load valve. It is equipped with a weighing instrument to which a conversion bellows is connected and in which hydraulic oil is sealed. By changing the lever fulcrum position in the variable load valve based on the operation of the weighing instrument, it is directly sent to the brake cylinder. A load-bearing device for an automatic brake configured to control the air pressure to be increased or decreased. A vehicle having two pillow springs for one vehicle is provided, and two load detection bellows corresponding to the two trucks are provided. 2 connected to these two load detection bellows
A load-bearing device for an automatic brake, characterized in that a plurality of passages are gathered into one gathering passage, and a conversion bellows is connected to the tip of this gathering passage. 2. A load detection bellows, which is equipped with a pillow spring at one end of the passage and is displaced in accordance with the size of the load on the bogie, is connected to the other end of the passage, and the bellows is displaced in conjunction with the lever fulcrum position conversion mechanism in the variable load valve. It is equipped with a weighing instrument to which a conversion bellows is connected and in which hydraulic oil is sealed. By changing the lever fulcrum position in the variable load valve based on the operation of the weighing instrument, it is directly sent to the brake cylinder. A load-bearing device for an automatic brake configured to control the air pressure to be increased or decreased. A vehicle having two pillow springs for one vehicle is provided, and two load detection bellows corresponding to the two trucks are provided. The conversion bellows are connected to the two load detection bellows via the passages, and the two conversion bellows are connected to both ends of the lever arm, and one end of the bellows is connected to the center of the lever arm. Freely connected A variable load device for an automatic brake, characterized in that the other end of the movable member is connected to a lever fulcrum position conversion mechanism in the variable load valve.