JP2014118026A - Hydraulic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic device that when performing an operation for removing air, can prevent air bubbles from accumulating on a tip of a shaft portion of a banjo bolt.SOLUTION: The hydraulic device comprises: a housing 14 in which an oil passage 22 is formed; an annular connection hole 23 formed on an upper end portion of the housing; and a banjo bolt 26 that is screwed into the connection hole to attach a banjo 25 of brake piping 24 to the housing. In the connection hole is formed a circular groove 23a at the bottom portion, and also is formed a first taper-shaped guide surface 23b reduced in a diameter from the outer peripheral edge of the circular groove along a shaft center in the oil passage. In an inner shaft direction of a shaft portion 26b of the banjo bolt is formed a shaft directional hole 26d, and from the outer peripheral edge of a lower end of the shaft portion and in a shaft center direction of the shaft direction hole is formed a second taper-shaped guide surface 26f.

Description

  The present invention relates to a hydraulic apparatus that controls a braking force for each wheel of a vehicle, for example.

  As a conventional hydraulic device, a brake hydraulic device for a vehicle described in Patent Document 1 below is known.

  Briefly, a brake hydraulic apparatus is attached to a housing having an oil passage formed therein, an electric motor for operating a pump for sucking brake fluid from a reservoir provided in the housing, and the housing. A plurality of solenoid valves for hydraulic control and a control device for controlling the operation of the electric motor.

  The housing is formed with a female screw hole to which the other end side of the brake pipe whose one end side is connected to the master cylinder or the wheel cylinder is connected. An annular banjo is integrally provided on the other end side of the brake pipe, and this banjo is connected to the housing by a shaft portion of a banjo bolt inserted into the female screw hole. The other end side of the brake pipe is connected via

  After connecting the brake pipe to the housing, the hydraulic pressure is applied to the oil passage to increase the internal pressure, and the hydraulic pressure is released to the atmosphere along with the bubbles by opening the air release valve on the wheel cylinder side. Then, the air in the oil passage is vented.

JP 2011-25777 A

  However, since the tip end surface of the shaft portion of the banjo bolt is formed in a flat shape in the brake hydraulic device, a part of the bubbles is formed in the flat tip surface and the female screw during the air bleeding operation in the oil passage. It stays in the gap between the bottom of the hole. As a result, the work efficiency of air bleeding is reduced.

  The present invention has been devised in view of the actual situation of the conventional hydraulic device, and provides a hydraulic device capable of suppressing air bubbles from staying between the front end of the mounting bolt and the connection hole during the air bleeding operation. To do.

According to a first aspect of the present invention, there is provided a housing having an oil passage formed therein, a connection hole for connecting the oil passage to an external oil passage, and screwing into the connection hole. Mounting bolts for attaching brake piping to
The mounting bolt has an axial passage that communicates the oil passage and the external oil passage in the internal axial direction from the tip of the shaft portion, and the axial passage is on the tip portion side of the shaft portion of the mounting bolt, A tapered guide surface having a diameter reduced from the outer peripheral side of the tip end edge of the shaft portion toward the axis of the axial passage is formed.

  By forming the tapered surface at the tip of the shaft portion of the mounting bolt, it is possible to suppress air bubbles from staying at the tip of the shaft portion during the air bleeding operation.

1 is a front perspective view of a first embodiment in which a hydraulic device according to the present invention is applied to a brake hydraulic device of a vehicle. It is a hydraulic circuit diagram of a brake hydraulic device in the present embodiment. It is a longitudinal cross-sectional view of the brake hydraulic apparatus of this embodiment. It is principal part sectional drawing of the brake hydraulic apparatus of this embodiment. It is principal part sectional drawing of the brake hydraulic apparatus of this embodiment. It is a front perspective view of the banjo bolt provided for this embodiment. It is a longitudinal cross-sectional view of the banjo bolt provided to this embodiment. It is a front perspective view which shows 2nd Embodiment of the hydraulic device which concerns on this invention. It is a front perspective view of the long volt | bolt provided to the 2nd Embodiment. It is a longitudinal cross-sectional view of the long bolt.

  Embodiments of a hydraulic device according to the present invention will be described below in detail with reference to the drawings.

In this embodiment, the present invention is applied to a vehicle brake hydraulic device that controls normal braking, ABS, and behavior of the vehicle.
[First Embodiment]
As shown in the hydraulic pressure circuit of FIG. 2, the brake hydraulic device 1 includes a master cylinder 2 that generates a brake pressure having a height corresponding to the amount of depression of the brake pedal, and the master cylinder 2 and the left and right front wheels (FR, FL ) Side and rear wheel left and right (RR, RL) side main cylinders 4, 4 communicating with each wheel cylinder 3, and the brakes from the master cylinder 2 to each wheel cylinder 3 are provided in the main passages 4, 4. Each wheel cylinder is provided in a normally-open solenoid type pressure-increasing valve 6 and 6 and a normally-closed solenoid type pressure-reducing valve 7 and 7 for controlling the hydraulic pressure, and in sub-passages 8 and 8 branched from the main passages 4 and 4. 3, a plunger pump 9 for discharging the brake fluid pressure, and two reservoir tanks 10, 1 for storing the brake fluid discharged from the wheel cylinders 3 via the pressure reducing valves 7, 7. When, a, a motor pump 21 for operating the plunger pump 9.

  The pressure-increasing valves 6 and 6 control the brake fluid pressure from the master cylinder 2 so that it can be supplied to each wheel cylinder 3 during normal braking operation, while the pressure-reducing valves 7 and 7 open when a slip occurs on the wheels. Thus, the brake fluid in each wheel cylinder 3 is returned to the reservoir tanks 10 and 10 for temporary storage, and each of the pressure increasing / reducing valves 6 and 7 is opened / closed by a controller (not shown). Thus, the brake fluid pressure in each wheel cylinder 3 is increased, reduced, and retained. Each of the pressure increasing / decreasing valves 6 and 7 is opened / closed by energizing or de-energizing electronic components (described later) that operate based on control signals from the controllers.

  Also, the brake fluid temporarily stored in the reservoir tanks 10 and 10 is not shown in the figure on the master cylinder 2 side through the gate-out valves 12 and 12 when the plunger pump 9 is operated by the pump motor 21. Return to the reservoir tank.

  The sub passages 8, 8 are provided between two gate-in valves 11, 11 provided between the master cylinder 2 and the plunger pump 9, and between the master cylinder 2 and the pressure increasing valves 6, 6. Two provided gate-out valves 12 and 12 and a plunger pump 9 operated by the pump motor 21 are provided.

  The gate-in valves 11 and 11 are normally closed solenoid type electromagnetic on-off valves, which are closed during normal braking or ABS operation, and are opened only during behavior control. On the other hand, the gate-out valves 12 and 12 are normally open solenoid-type electromagnetic on-off valves that are opened during normal braking and ABS operation, and are closed during behavior control.

  During the behavior control of the vehicle, the plunger pump 9 is actuated by a pump motor 21 and the pressure-increasing valves 6 and the gate-out valves 12 are closed, while the gate-in valve 11 is opened. The brake fluid is sucked from the master cylinder 2 through the sub-passage 8 by the plunger pump 9, and the pressure increasing valve 6 communicating with the wheel cylinder 3 to which the hydraulic pressure is to be applied is opened so that the brake fluid is pumped. It has become.

  The pressure-increasing valves 6 and 6, the pressure-reducing valves 7 and 7, the plunger pump 9 and the gate-in valves 11 and 11 and the gate-out valves 12 and 12 of the assist control mechanism 13 are held in the housing 14. .

  Specifically, as shown in FIGS. 1 and 3, the housing 14 is formed in a relatively thin and substantially rectangular shape integrally formed of an aluminum alloy material, and the housing 14 is formed on the upper side of one side portion. Valve holding holes 15 and 16 for holding the pressure increasing valves 6 and 6 and the pressure reducing valves 7 and 7 are formed in the vertical position, respectively, and the gate-in valve 11 of the assist control mechanism 13 is held at the lower position. A holding hole 17 is formed in the same direction as the valve holding holes 15 and 16. Further, the pressure-increasing valves 6, 6, 7, 7 and the gate-in valves 11, 11 held in the respective valve holding holes 15, 16, 17 are the holder portions 5 a, 6 a, 11 a, and the holding holes 15, 16, 17 are respectively. Are fixed to the housing 14 by caulking the opening edges 15a, 16a, and 17a.

  Further, a frame-like casing 19 that holds an electronic component 18 such as a printed circuit board is fixed to one side of the housing 14 with bolts, and a cover for mounting the electronic component 18 on the outside of the casing 19. A member 20 is attached. And the protrusion part of each said pressure increase / decrease valve 6 and 7 and the upper end part of each gate-in valve 11 are fitted inside the said casing 19 in the state hold | maintained inside. On the other hand, the pump motor 21 is fixed to the other side surface of the housing 14 by bolts 36.

  Further, as shown in FIGS. 4 and 5, the housing 14 includes a plurality of oil passages 22 through which the brake fluid flows and arranged in parallel along the vertical direction. A connection hole 23 communicating with the oil passage 22 is formed. Further, one end of the brake pipe 24 is screwed and fixed to each connection hole 23 by a banjo bolt 26 which is a mounting bolt.

  Each of the connection holes 23 is formed in a line in a cylindrical shape from the top surface of the housing 14 in the vertical direction, and has an internal thread hole formed on the inner peripheral surface, and the bottom portion of the banjo bolt 26 is formed. An annular groove 23a is formed for giving a tightening allowance when screwed.

  The annular groove 23a has a first guide surface 23b which is a tapered guide surface having a groove shape formed in a substantially V-shaped cross section and having a reduced diameter from the bottom along the axial direction of the oil passage 22. Is formed. That is, the first guide surface 23 b is directed to the oil passage 22 with a conical taper angle set to approximately 45 °.

  The brake pipe 24 includes a brake hose 28 that communicates with each wheel cylinder 3, and a banjo 25 that is integrally attached to one end of the brake hose 28 via a connecting portion 27.

  The banjo 25 is formed with an external oil passage 30 communicating with each wheel cylinder 3 inside a cylindrical base end portion 25a, and a bolt insertion hole 25c through which the banjo bolt 26 is inserted at the distal end side. An annular portion 25b is formed.

  The annular portion 25b is connected to a flange portion 26c (described later) of the banjo bolt 26 and a hole edge portion of the connection hole 23 through a metal washer 29 for sealing disposed on the upper end surface in the axial direction and the lower end surface in the axial direction. It is fixed in a sandwiched state between

  The banjo bolt 26 is provided integrally between a head portion 26a provided in a hexagonal shape, a shaft portion 26b provided integrally with a lower end of the head portion 26a, and the head portion 26a and the shaft portion 26b. And a cylindrical flange portion 26c.

  The shaft portion 26b is formed with a male screw portion on the outer periphery, an axial hole 26d that is an axial passage is formed in the inner axial direction, and a radial direction along the radial direction from the upper end of the axial hole 26d. A radial hole 26e that is a passage is formed.

  The shaft portion 26b is formed with an annular passage groove 25g on the outer peripheral surface where the outer opening of the radial hole 26e is located, and the radial hole 26e and the external oil passage 30 are formed via the passage groove 26g. Is communicated.

  In the axial hole 26d, a second guide surface 26f that is a substantially conical tapered surface is formed at the lower end facing the oil passage 22.

  The second guide surface 26f is formed in a reduced diameter from the outer peripheral edge of the lower end of the shaft portion 26b along the axial direction of the axial hole 26d, and the taper angle is approximately 45 °.

Therefore, the second guide surface 26f is formed substantially in parallel with the first guide surface 23b.
[Effects of First Embodiment]
Therefore, according to this embodiment, when the driver applies, for example, sudden braking while the vehicle is running, the pressure increasing valves 6 are closed and the brake fluid from the master cylinder 2 is cut off. On the other hand, each of the pressure reducing valves 7 is opened, and the hydraulic pressure applied to each wheel cylinder 3 is returned to the reservoir tanks 10 and 10, and the brake fluid is supplied to the gate-out by the plunger pump 9 operated by the pump motor 21. It returns to the master cylinder 2 through the valves 12 and 12. Then, the hydraulic pressure in the brake hydraulic system 1 is increased and decreased by operating the open / close valves 6 and 7 by a controller (not shown) to operate the ABS.

  When the behavior control is performed while the vehicle is running, each gate-out valve 12 is closed while the gate-in valve 11 is opened, and the plunger pump 9 causes the sub-passage 8 from the master cylinder 2. The brake fluid is inhaled. Then, the brake fluid is pumped through the pressure increasing valve 6 communicating with the wheel cylinder 3 where the hydraulic pressure is to be applied.

  And in this embodiment, after assembling each component, when the air pressure is applied to the oil passage 22 to perform air bleeding, most of the bubbles mixed in the brake fluid in the oil passage 22 It is quickly discharged to the outside through the brake hose 28 or the like.

  In particular, in the present embodiment, as shown in FIG. 5, a second guide surface 26f having a reduced diameter is formed from the outer peripheral edge of the lower end of the shaft portion 26b of the banjo bolt 26 along the axial direction of the axial hole 26d. As a result, air bubbles that have flowed from the oil passage 22 into the gap between the annular groove 23a and the tip of the shaft portion 26b of the banjo bolt 26 promptly enter the axial hole 26d along the second guide surface 26f. Be guided to. Thereby, it is possible to suppress the bubbles A from staying at the tip of the shaft portion 26b of the banjo bolt 26.

  In addition, even when the air bubbles A try to stay in the annular groove 23a of the connection hole 23 during the air bleeding operation, the diameter A decreases from the outer peripheral edge of the annular groove 23a along the axial direction of the oil passage 22. Since the formed first guide surface 23b is formed, the bubble A is promptly guided to the axial hole 26d along the first guide surface 23b, and further from here, the radial hole 26e, the passage groove 26g and the external oil passage 30 to flow into each wheel cylinder 3. Then, bubbles are discharged into the atmosphere together with the hydraulic pressure from the air release valve of each wheel cylinder 3. Therefore, the bubbles A are suppressed from staying in the annular groove 23a.

Furthermore, the second guide surface 26f having a reduced diameter is formed from the outer peripheral edge of the lower end of the shaft portion 26b of the banjo bolt 26 along the axial center direction of the axial hole 26d, so that the bubbles A are formed in the annular groove 23a. Since it can suppress that it retains in an inside, the work efficiency of an air bleeding operation | work can be improved.
[Second Embodiment]
8 to 10 show a second embodiment, the configuration of one end side of the brake pipe 24 is changed, the banjo bolt is changed to a long bolt 31, and a hydraulic pressure sensor 32 is provided on the long bolt 31. Is.

  That is, as shown in FIGS. 9 and 10, the long bolt 31 is composed of a head portion 31a provided in a hexagonal shape and a shaft portion 31b provided integrally at the lower end of the head portion 31a. The hydraulic pressure sensor 32 is screwed into the connection hole 23 through an insertion hole (not shown).

  The head 31a is formed with a female screw hole 31b in the center of the upper part. The female screw hole 31b has a connecting bolt 33, which will be described later, provided at the tip of the brake pipe 24 and is fixed by screwing. A groove 31c is formed.

  The annular groove 31c is formed with a third guide surface 31h having a reduced diameter from the outer peripheral edge along the axial direction of an axial hole 31e described later.

The shaft portion 31d has a male screw formed on the outer periphery, an axial hole 31e which is an axial passage communicating with the connection hole 31b in the inner axial direction, and a diameter on the upper end side of the axial hole 31e. A radial hole 31f, which is a radial passage along the direction, is formed. Further, similarly to the first embodiment, a second guide surface 31g having a reduced diameter is formed from the outer periphery of the lower end along the axial center of the axial hole 31e.
The shaft portion 31d has an annular passage groove 31i formed on the outer peripheral surface where the outer opening of the radial hole 31f is located, and the radial hole 31f and the hydraulic pressure sensor 32 are interposed via the passage groove 31i. Is communicated.

  The brake pipe 24 includes the brake hose 28 that communicates with the wheel cylinders 3, and a connection bolt 33 provided at the tip of the brake pipe 24.

  The connection bolt 33 includes a head portion 33a formed in a hexagonal shape, and a shaft portion provided integrally with a lower end of the head portion 33a, and a male screw that is screwed into the female screw hole 31b of the long bolt 31 on the outer periphery. 33b.

  The head 33a is provided with the brake hose 28 rotatably at the center. The shaft portion 33b is formed with the external oil passages 30 communicating with the wheel cylinders 3 in the axial direction inside, and from the outer peripheral edge of the tip end along the axial direction of the external oil passages. A fourth guide surface 33c having a reduced diameter similar to the guide surface 31g is formed at a taper angle of 45 °.

  The hydraulic pressure sensor 32 is formed with an annular bolt insertion hole (not shown) through which the shaft portion 31d is inserted, and the metal washer 29 disposed on the axial upper end surface and the axial lower end surface. It is fastened together with the long bolt 31 via the screw.

  In the present embodiment, as in the first embodiment, after each component is assembled, if air is released by applying hydraulic pressure to the oil passage 22, bubbles mixed in the brake fluid in the oil passage 22 Most of the water is quickly discharged to the outside through the brake hose 28 or the like.

  And this embodiment also formed the reduced diameter 4th guide surface 31g along the said axial direction hole 31e from the lower end outer periphery of the axial part 31d of the said long volt | bolt 31 similarly to 1st Embodiment, Bubbles that flow from the oil passage 22 into the gap between the annular groove 23a and the tip of the shaft portion 31d of the long bolt 31 are guided to the axial hole 31e along the fourth guide surface 31g. Thereby, it is possible to suppress the bubbles A from staying at the distal end side of the shaft portion 31d of the long bolt 31.

  Furthermore, the fourth guide surface 33c is formed from the outer peripheral edge of the lower end of the shaft portion 33b of the connection bolt 33 along the axial direction of the external oil passage, so that the female screw hole of the long bolt 31 extends from the axial hole 31e. Air bubbles that have flowed into the gap between 31b and the tip of the shaft 31d of the long bolt 31 are guided to the external oil passage 30 along the fourth guide surface 33c. As a result, the formation of the fourth guide surface 33c can suppress bubbles from staying at the tip of the shaft portion 33b of the connection bolt 33 as in the first embodiment.

  Further, at the time of the air bleeding operation, for example, even if the bubbles try to stay in the annular groove 31c of the female screw hole 31b, the bubbles are promptly guided to the external oil passage 30 along the third guide surface 31h. , Are guided to the wheel cylinders 3 at the ends. Then, bubbles are discharged to the atmosphere together with the hydraulic pressure through the air release valve of each wheel cylinder 3. Accordingly, the bubbles are prevented from staying in the annular groove 31c as in the first embodiment.

  In addition, since the hydraulic pressure sensor 32 is provided on the outer periphery of the shaft portion 31d of the long bolt 31, the hydraulic pressure is applied to the hydraulic pressure sensor 32 from the radial hole 31f through the passage groove 31i. Pressure can be sensed.

  In addition, since the other configuration is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.

  The present invention is not limited to the configuration of each of the embodiments described above, and the configuration can be changed without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 ... Brake hydraulic device 2 ... Master cylinder 3 ... Wheel cylinder 9 ... Plunger pump 11 ... Gate-in valve 12 ... Gate-out valve 14 ... Housing 22 ... Oil path 23 ... Connection hole 23b ... 1st guide surface 23 ... Connection hole 24 ... Brake piping 25 ... Banjo 26 ... Banjo bolt (mounting bolt)
26d ... Axial hole (axial passage)
26e ... radial hole (radial passage)
26f ... 2nd guide surface (guide surface)
26 g ... passage groove 27 ... connecting portion 28 ... brake hose 30 ... external oil passage 31 ... long bolt (mounting bolt)
31e ... Axial hole (axial passage)
31f ... Radial hole (radial passage)
31g ... 2nd taper surface (guide surface)
31h ... Third taper surface (guide surface)
32 ... Hydraulic pressure sensor 33 ... Connection bolt 33a ... Head 33b ... Shaft 33c ... Fourth guide surface (guide surface)

Claims (3)

A housing having an oil passage formed therein and a connection hole for connecting the oil passage to an external oil passage;
A mounting bolt that is screwed into the connection hole and attaches a brake pipe to the housing;
The mounting bolt has an axial passage that communicates the oil passage and the external oil passage in the inner axial direction from the tip of the shaft portion,
The axial passage has a tapered guide surface that is reduced in diameter from the outer peripheral side of the distal end edge of the shaft portion toward the axial center of the axial passage on the distal end side of the shaft portion of the mounting bolt. Hydraulic device characterized by. A housing having an oil passage formed therein and a connection hole for connecting the oil passage to an external oil passage;
A mounting bolt that is screwed into the connection hole and attaches a brake pipe to the housing;
The mounting bolt has an axial passage formed along the internal axial direction from the tip of the shaft portion, and a radial passage formed through the radial direction from the upper end portion of the axial passage, The oil passage communicates with the external oil passage through the hole,
2. The hydraulic apparatus according to claim 1, wherein the axial passage includes a trumpet-shaped guide surface formed at the tip of the shaft of the mounting bolt from the outer periphery of the tip of the shaft toward the shaft center of the shaft. The hydraulic device according to claim 1 or 2,
The said connection hole is provided with the taper-shaped guide surface diameter-reduced toward the axial center of the said oil path from the outer peripheral side of a bottom part.

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