JP4327652B2 - Reservoir tank - Google Patents

Description

  The present invention relates to a reservoir tank, and more particularly to a reservoir tank that supplies hydraulic fluid supplied to hydraulic equipment such as a hydraulic master cylinder for a vehicle through a connecting hose connected from a liquid storage chamber to a connection connector.

In the reservoir tank that supplies the hydraulic fluid supplied to the vehicle hydraulic master cylinder via the connecting hose from the connection connector provided at the bottom of the side wall of the storage chamber, the liquid level in the storage chamber is tilted due to the inclination of the vehicle and connected. There is a possibility that the liquid storage chamber side opening of the connector is exposed from the liquid surface and sucks air. For this reason, an internal side passage is provided in a state in which the liquid storage chamber side of the connector is extended into the liquid storage chamber, and the inner end opening of the internal side passage is positioned at the bottom of the liquid storage chamber and in the vicinity of the center portion. Accordingly, a reservoir tank has been proposed in which the fluctuation of the liquid level due to the inclination is reduced and air suction is prevented (see, for example, Patent Document 1). Further, in order to surely discharge the air that has entered the connecting connector or the connecting hose, the protruding direction of the connecting connector provided in the reservoir tank is inclined downward with respect to the horizontal plane (for example, Patent Document 2). reference.).
JP-A-11-222118 Japanese Patent Laid-Open No. 2003-40098

  However, since the internal side passage as described in Patent Document 1 is formed in the horizontal direction substantially along the bottom surface of the liquid storage chamber, in the unlikely event that air enters the internal side passage or the connecting hose It is difficult to discharge air from the inside toward the liquid storage chamber. Also, due to the relationship of the mounting position of the hydraulic master cylinder and reservoir tank to the vehicle body, the reservoir tank may be mounted with the tank tilted slightly forward, that is, with the connection connector side tilted upward. Then, it becomes impossible to discharge the air that has entered the internal passage, the connection connector, and the connection hose.

  On the other hand, when an internal side passage similar to that of Patent Document 1 is to be provided in a reservoir tank having a connecting connector inclined downward as described in Patent Document 2, when the lower half of the reservoir tank is injection molded Since the core for forming the inner surface of the connection connector and the inner side passage must be largely bent at the inner end portion of the connection connector, it is extremely difficult to pull out the core from the formed connection connector and the inner side passage. As a result, it was difficult to integrally form the internal passage as described above in a reservoir tank that protruded with the connecting connector inclined downward. In addition, if the inner side passage is linearly extended into the liquid storage chamber at the same inclination angle as the connector, the injection molding can be performed without any problem, but the end opening of the inner side passage opens near the liquid surface. It will be easy to inhale air.

  Accordingly, an object of the present invention is to provide a reservoir tank having a structure capable of suppressing air suction without impairing the injection moldability of the reservoir tank and capable of reliably discharging air from the connecting hose side. It is said.

In order to achieve the above object, the reservoir tank of the present invention has a connecting connector for connecting a connecting hose for connecting the liquid storage chamber and the hydraulic equipment to the bottom of the side wall of the liquid storage chamber. In the reservoir tank projecting in a state of being extended, an internal communication pipe extends from the inner end of the connection connector toward the upper side of the liquid storage chamber, and the end opening of the internal communication pipe extends to the liquid surface accompanying the inclination of the reservoir tank. A conical shape in which the angle of inclination of the axis with respect to the horizontal plane of the internal communication pipe is made smaller than the angle of inclination of the axis of the connection connector, and the inner surface of the connection connector gradually becomes larger in diameter at the opening end side. The upper inner surface of the connection connector located on the upper side of the reservoir tank and the upper inner surface of the internal communication pipe are linearly continuous . In addition, a liquid level detector may be provided inside the liquid storage chamber, and an end opening of the internal communication pipe may be positioned in the vicinity of the liquid level detector.

  According to the reservoir tank of the present invention, the end opening position of the internal communication pipe is set to a portion where the liquid level fluctuation due to the inclination of the reservoir tank is small, so that air suction is suppressed even when the vehicle is largely inclined. Can do. In addition, by making the inclination angle of the internal communication pipe smaller than the inclination angle of the connection connector, the end opening position of the internal communication pipe can be brought closer to the bottom of the liquid storage chamber. Furthermore, by forming the inner surface of the connection connector into a conical shape with the opening end side gradually becoming larger in diameter, the core that forms the inner surfaces of the connection connector and the internal communication pipe can be easily pulled out. In particular, by continuously connecting the upper inner surface of the connection connector and the upper inner surface of the internal communication pipe in a straight line, the core can be pulled out more easily and the moldability can be improved. In addition, by positioning the end opening of the internal communication pipe in the vicinity of the liquid level detector, the liquid level detector can be operated before the end opening is exposed from the liquid level, and air suction is ensured. Can be prevented.

  1 to 3 show an embodiment in which the reservoir tank of the present invention is applied to a reservoir for a tandem hydraulic master cylinder in an automobile brake device. FIG. 1 shows a state when the vehicle is tilted forward. FIG. 2 is a plan view showing a lower half of the reservoir tank, and FIG. 3 is a plan view showing a state in which a connecting hose is connected.

  The reservoir tank 1 is formed by combining a lower half 2 and an upper half 3 which are respectively molded by injection molding of synthetic resin, and a pair of vehicle body mounting pieces 2a are integrally formed on both side walls of the lower half 2. A cap 4 is attached to the upper opening formed and formed in the upper half 3. Inside the lower half 2, two liquid storage chambers 2 c are defined by a partition wall 2 b, and a mounting portion 2 d of the liquid level detector 5 is defined in front of the partition wall 2 b. Further, a connection connector 7 for connecting the connecting hose 6 is provided on the outer surface of the bottom of the rear wall of the lower half 2 so as to correspond to each liquid storage chamber 2c, and from the inner end of the connection connector 7 to the liquid storage chamber. The internal communication pipes 8 are extended upward in the 2c. The connection hose 6 has one end connected to the connection connector 7 and the other end connected to a reservoir joint 9 attached to the hydraulic master cylinder.

  The connection connector 7 protrudes with its axis 7L inclined downward relative to the horizontal plane, and air (bubbles) is drawn from the inside of the connection connector 7 and the connecting hose 6 toward the liquid storage chamber 2c. It can be discharged. Furthermore, the inner surface 7a of the connection connector 7 is formed in a conical shape in which the opening end 7b side gradually becomes larger in diameter. Further, the upper inner surface 7c of the connection connector 7 positioned above the reservoir tank 1 and the upper inner surface 8a of the internal communication pipe 8 are formed so as to be linearly continuous.

  The internal communication pipe 8 has an inner diameter that is the same as or slightly smaller than the inner end opening of the connection connector 7, and the axis 8 </ b> L of the internal communication pipe 8 is close to a straight line with respect to the axis 7 </ b> L of the connection connector 7. In addition, the inclination angle with respect to the horizontal plane is set to be smaller than the inclination angle of the axis 7 </ b> L of the connection connector 7. The inclination angle of the axis 8L of the internal communication pipe 8 with respect to the horizontal plane depends on the diameter of the connection connector 7 and the inclination angle of the axis 7L with respect to the horizontal plane, the length of the internal communication pipe 8, the liquid level in the liquid storage chamber 2c, and the inclination of the vehicle. It is set in accordance with various conditions such as the amount of liquid level fluctuation, and is set in consideration of the pullability of the core that molds the inner surfaces of the connection connector 7 and the internal communication pipe 8 during injection molding. Further, the length of the internal communication pipe 8 is set so that the end opening 8b is opened at a position where there is little liquid level fluctuation due to the inclination of the vehicle.

  Further, when the liquid level detector 5 is provided in the reservoir tank 1, the liquid level detector 5 is provided at a position where the liquid level fluctuation is small, and the end opening 8 b is positioned in the vicinity of the liquid level detector 5. Thus, it is possible to prevent the end opening 8b of the internal communication pipe 8 from being exposed from the liquid level while preventing the malfunction of the liquid level detector 5 due to the liquid level fluctuation accompanying the inclination of the vehicle.

  In this way, the internal communication pipe 8 extends from the inner end of the connection connector 7 upward in the liquid storage chamber 2 c, and the end opening 8 b of the internal communication pipe 8 is connected to the liquid surface accompanying the inclination of the reservoir tank 1. By positioning it in a portion with little fluctuation, air will not be sucked even if the liquid level fluctuates due to the inclination of the vehicle. Further, by making the inclination angle of the axis 8L of the internal communication pipe 8 smaller than the inclination angle of the axis 7L of the connection connector 7, for example, when the inclination angle of the axis 7 of the connection connector 7 with respect to the horizontal plane is about 10 degrees By setting the inclination angle of the axis 8L of the internal communication pipe 8 to about 5 degrees, the internal communication pipe can be formed without impairing the pullability of the core that forms the inner surface of the connection connector 7 and the internal communication pipe 8 during injection molding. 8 end openings 8b can be brought close to the bottom surface of the liquid storage chamber 2c. Thus, as shown in FIG. 1, the end opening 8b is set so as not to be exposed from the liquid level even when the vehicle is largely inclined forward on a downhill or the like and the reservoir tank 1 is inclined forward to about 30 degrees. be able to. Furthermore, by forming the inner surface 7a of the connection connector 7 in a conical shape having a large diameter on the opening end 7b side, the core can be pulled out more easily, improving the moldability and improving the internal communication pipe 8. The inclination angle can be made smaller.

  Further, when forming the inner surface 7a of the connection connector 7 into a conical shape with the diameter of the opening end 7b being enlarged, the upper inner surface 7c is linearly connected to the upper inner surface 8a of the internal communication pipe 8 and the lower inner surface is connected to the internal communication pipe 8. By making the state inclined downward with respect to the lower inner surface, the upper surface portion of the core forming the inner surface of the connection connector 7 and the internal communication pipe 8 can be made into a straight state, so that the pullability of the core is further improved. In addition, air bubbles can be smoothly discharged from the connection connector 7 to the internal communication pipe 8.

  In addition, although the reservoir tank which connected two connection hoses was illustrated in the said form example, it is the same also when there is one connection hose.

It is a section side view of a reservoir tank which shows a state when a vehicle inclines ahead. II-II sectional view of FIG. It is a top view which shows the state which connected the connection hose.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reservoir tank, 2 ... Lower half, 2a ... Vehicle mounting piece, 2b ... Partition, 2c ... Liquid storage chamber, 2d ... Mounting part, 3 ... Upper half, 4 ... Cap, 5 ... Liquid level detector, 6 ... Connecting hose, 7 ... Connector, 7a ... Inner surface, 7b ... Open end, 7c ... Upper inner surface, 7L ... Axis, 8 ... Internal communication pipe, 8a ... Upper inner surface, 8b ... End opening, 8L ... Axis, 9 ... Reservoir joint

Claims (2)

In the reservoir tank projecting in a state in which a connection hose for connecting a connection hose for communicating the liquid storage chamber and the hydraulic equipment is inclined downward with respect to a horizontal plane at the bottom of the side wall of the liquid storage chamber, the connection connector An internal communication pipe extending from the inner end of the storage tank toward the upper part of the liquid storage chamber, and the end opening of the internal communication pipe is positioned at a portion where the liquid level fluctuation is small due to the inclination of the reservoir tank. The angle of inclination of the axis with respect to a horizontal plane is made smaller than the angle of inclination of the axis of the connection connector, the inner surface of the connection connector is formed in a conical shape with the opening end side gradually becoming larger in diameter, and the connection located above the reservoir tank A reservoir tank , wherein an upper inner surface of a connector and an upper inner surface of the internal communication pipe are linearly continuous . The provided with a liquid level sensor in the interior of the liquid reservoir chamber, said liquid level sensor according to claim 1 Symbol placement of the reservoir tank, wherein said that the end opening of the inner communication pipe was located in the vicinity of.

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