JPS5824645B2 - Amplitude adjustment device in hydraulic oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplitude adjustment device for a hydraulic oscillator.

The hydraulic piston is vibrated by the interaction between a spool that receives constant pressure and alternating pressure from both sides in the pilot valve and a hydraulic piston that receives constant pressure and alternating pressure from both sides in the cylinder. In conventional hydraulic oscillators, there is a spool operating oil passage that communicates the constant pressure side of the hydraulic piston with the alternating pressure side of the pilot valve, and a piston operating oil passage that communicates the pilot valve with the alternating pressure side of the hydraulic piston. Since the positions of the oil supply port and the communication port where the oil passages open into the cylinders are fixed, the amplitude of the hydraulic piston remains unchanged.

Therefore, the conventional hydraulic oscillator cannot be used in applications requiring variable amplitude.

The present invention aims to improve the conventional hydraulic oscillator so that the amplitude can be adjusted, and the spool operating oil passage has an inclined groove that cooperates with an oil filler port opening on the inner surface of the cylinder. The inclined groove is formed on the circumferential surface of the constant pressure chamber side of the hydraulic piston, and the inclined groove and the constant pressure chamber of the hydraulic piston are communicated through a communication hole, so that the amplitude of the hydraulic oscillator can be adjusted by adjusting the rotation of the hydraulic piston. It is characterized by the fact that

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The drawing is a sectional view of a hydraulic oscillator equipped with the amplitude adjustment device of the present invention.

In the figure, reference numeral 1 denotes a hydraulic oscillator, which includes a pilot valve 2, a cylinder 3, and a hydraulic piston 4.

5 is a spool slidably built into the pilot valve 2, and 6 is a supply/discharge chamber made of an annular groove formed in the middle of the spool 5.

1 and 8 are a small-diameter operating rod and a large-diameter operating rod that press both ends of the spool 5, respectively.

Reference numerals 9 and 10 denote a constant pressure chamber and an alternating pressure chamber for introducing pressure oil into the end faces of the small diameter operating rod 7 and the large diameter operating rod 8, respectively.

A side wall where the pilot valve 2 is attached to the cylinder 3 is provided with an oil supply hole 11, a communication hole 12, and an oil drain hole 13.
The oil supply hole 11 and the communication hole 12 are designed to communicate with each other through the supply and discharge chamber 6 when the spool 5 moves upward.

The spool portion of the hydraulic piston 4 is connected to the liner 14 of the cylinder 3.
is slidably fitted to the

An alternating pressure chamber 15 with a large pressure receiving area, a communication chamber 16, and a constant pressure chamber 17 with a small pressure receiving area are formed between the spool portion of the hydraulic piston 4 and the liner 14.

The liner 14 is provided with a communication port 18 that opens at the top of the alternating pressure chamber 15 and an oil supply port 19 that opens at the bottom of the constant pressure chamber 17, and an oil drain port 20 and a fuel supply port 21 are provided in the middle of the liner 14. When the hydraulic piston 4 moves upward, the oil drain port 20 and the oil fill port 21 are blocked by the circumferential surface of the hydraulic piston 4 on the constant pressure chamber 17 side, and when the hydraulic piston 4 moves downward, the oil drain port 20 and the oil fill port 21 are blocked through the communication chamber 16. The oil drain port 20 and the oil fill port 21 are designed to communicate with each other.

An oil supply pipe connection port 22 and an oil drain pipe connection port 23 are provided on the upper end surface of the cylinder 3.

Reference numeral 24 denotes a supply oil passage, which communicates the oil supply pipe connection port 22 with a hole 9' communicating with the constant pressure chamber 9 of the pilot valve 2, the oil supply hole 11, and the oil supply port 19 of the cylinder 3.

Reference numeral 25 denotes a drain oil passage, which communicates the drain oil pipe connection port 23 with the drain oil hole 13 of the pilot valve 2 and the drain oil pipe 20 of the cylinder 3.

Reference numeral 26 denotes a piston operating oil passage, which communicates the communication hole 12 of the pilot valve 2 with the communication port 18 of the cylinder 3.

Reference numeral 21 denotes a spool operating oil passage, which communicates a hole 10' communicating with the alternating pressure chamber 10 of the pipe throat valve 2 with the oil supply port 19 of the cylinder 3.

28 is a spline carved into one end of the hydraulic piston 4.

A guide member 29 slidably guides the spline 28, and is rotatably fitted to one end of the cylinder 3.

Reference numeral 30 denotes a set bolt screwed into the cylinder 3, the tip of which is connected to an annular groove 31 carved on the circumferential surface of the guide member 29.
is engaged in.

The means for rotatably attaching the hydraulic piston 4 to the cylinder 3 can be modified in design instead of the embodiment shown in the drawings.

Reference numeral 32 denotes an amplitude adjusting inclined groove, which is carved on the circumferential surface of the hydraulic piston 4 on the constant pressure chamber 17 side.

33 is a communication hole bored in the hydraulic piston 4 so as to communicate the amplitude adjusting inclined groove 32 and the constant pressure chamber 17.

When the hydraulic piston 4 moves and the amplitude adjustment inclined groove 32 communicates with the oil filler port 21, the pressure oil in the constant pressure chamber 17 passes through the communication hole 33, the amplitude adjustment inclined groove 32, and the oil filler port 21, and operates the spool. It is designed to be introduced into the oil passage 27.

The hydraulic oscillator 1 of the present invention configured as described above is installed in a civil engineering work machine or the like that requires variable amplitude, and the oil supply pipe connection port 22 and oil drain pipe connection port 23 of the cylinder 3 are connected to a hydraulic power source (not shown). It is used by connecting it to a tank, etc.

Therefore, the oil supply line 2 is connected from the oil pressure source through the oil supply pipe connection port 22.
When pressure oil is supplied to 4, the pressure oil flows through hole 9' and oil supply port 19.
It is then introduced into the constant pressure chamber 9 of the pilot valve 2 and the constant pressure chamber 17 of the cylinder 3.

In the pilot valve 2, the spool 5 moves downward via the small diameter operating rod 7, and in the cylinder 3, the hydraulic piston 4 starts moving upward.

At this time, the alternating pressure chamber 15 communicates with a tank (not shown) via the communication port 18, piston operating oil passage 26, communication hole 12, supply/discharge chamber 6, oil drain hole 13, discharge oil passage 25, and oil drain pipe connection port 23. are doing.

Next, in the process of upward movement of the hydraulic piston 4, when the amplitude adjusting inclined groove 32 communicates with the oil supply port 21, the pressure oil in the constant pressure chamber 11 flows through the communication hole 33, the amplitude adjusting inclined groove 32, and the oil supply port 21. Port 21, spool operating oil passage 21 and hole 1
0' into the alternating pressure chamber 10 of the pilot valve 2.

Since the pressure receiving area of the large diameter working rod 8 is larger than the pressure receiving area of the small diameter working rod γ, the large diameter working rod 8 overcomes the pressing force of the small diameter working rod 1 and moves the spool 5 upward.
When the spool 5 moves upward, the oil supply hole 11 and the communication hole 12 communicate with each other via the supply and discharge chamber 6, and the pressure oil is communicated with the oil supply hole 11°, the communication hole 12, the piston operating oil passage 26, and the communication hole 11. It is introduced into the alternating pressure chamber 15 via the port 18.

Since the pressure receiving area of the hydraulic piston 4 in the alternating pressure chamber 15 is larger than the pressure receiving area of the hydraulic piston 4 in the constant pressure chamber 17, the hydraulic piston 4 starts moving downward.

Next, in the process of downward movement of the hydraulic piston 4, when the oil supply hole 21 and the oil drain port 20 communicate with each other via the communication chamber 16, the pressure oil in the alternating pressure chamber 10 of the pilot valve 2 flows through the hole 10', Spool operating oil passage 27, oil supply port 21, communication chamber 16, oil drain port 20, drain oil passage 25, and oil drain pipe connection port 2
3 to a tank (not shown), and the pressure inside the alternating pressure chamber 10 decreases, so when the spool 5 is pressed by the small diameter operating rod 7 and moves downward, the alternating pressure chamber 1 of the cylinder 3
5 communicates with a tank (not shown) as described above, and as the pressure in the alternating pressure chamber 15 decreases, the hydraulic piston 4 is pressed by the pressure oil in the constant pressure chamber 17 and moves upward.

Thereafter, the above operation is repeated. As above,
The interaction between the spool 5 in the pilot valve 2 and the hydraulic piston 4 in the cylinder 3 allows the hydraulic piston 4 to vibrate.

Next, in order to adjust the amplitude, loosen the set bolt 30 slightly to make the guide member 29 rotatable, and use the square shaft portion 34 protruding from the end of the hydraulic piston 4 or the engagement formed on the upper surface of the guide member 29. A suitable tool is installed in the stop hole 35, and after simultaneously rotating the hydraulic piston 4 and the guide member by a required angle, the set bolt 30 is tightened.

When the hydraulic piston 4 is rotated and adjusted as described above, the location of the amplitude adjustment inclined groove 32 that should communicate with the oil supply port 21 to the spool operating oil path 2γ is changed, and the pressure oil in the constant pressure chamber 17 is changed. Communication hole 33, amplitude adjustment inclined groove 32, oil filler port 2
1. The timing of introducing oil into the alternating pressure chamber 10' of the pilot valve 2 via the spool operating oil passage 27 and the hole 10' is adjusted.

That is, when the hydraulic piston 4 is rotated in the direction of the arrow in the figure, the timing is advanced, and thereby the timing at which the spool 5 starts to move upward and the timing at which the hydraulic piston 4 starts to move downward are changed. As a result, the sliding distance of the hydraulic piston 4 becomes smaller and the amplitude becomes smaller.

When the hydraulic piston 4 is rotated in the opposite direction to the above, the amplitude increases.

The amplitude of the hydraulic piston 4 is adjusted using an amplitude adjustment inclined groove 3.
This is done within the range of the interval between the two ends of the hydraulic piston in the axial direction.

As can be easily understood from the above explanation, the present invention allows the amplitude to be adjusted by simply adjusting the rotation of the hydraulic piston. It is suitable for the intended use.

[Brief explanation of drawings]

The drawing shows an embodiment of the present invention, and is a longitudinal sectional view of a hydraulic oscillator. 1...Hydraulic oscillator, 2...Pilot valve, 3...Cylinder, 4...Hydraulic piston, 5...Spool, 6... ...Supply/discharge chamber, 7...Small diameter operating rod, 8...Large diameter operating rod, 9...Constant pressure chamber, 9'...・Hole, 1
0... Alternate pressure chamber, 10'... Hole, 1
1... Oil supply hole, 12... Communication hole, 13
...Drain hole, 14...Liner, 15.
...Alternative pressure chamber, 16...Communication chamber, 11
... Constant pressure chamber, 18 ... Communication port, 19
...Oil filler port, 20...Oil drain port, 21.
...Refueling port, 22...Refueling pipe connection port, 2
3... Oil drain pipe connection port, 24... Supply oil path, 25... Discharge oil path, 26... Oil path for piston operation, 27... ... Oil passage for spool operation, 28 ... Spline, 29 ... Guide member, 30 ... Set bolt, 31 ...
・Annular groove, 32... Inclined groove for amplitude adjustment, 33
......Communication hole, 34...Square shaft part, 35.
...Lock hole.

Claims (1)

[Claims] 1. The hydraulic piston is vibrated by the interaction between a spool that receives constant pressure and alternating pressure from both sides in the pilot valve and a hydraulic piston that receives constant pressure and alternating pressure from both sides in the cylinder. In such a hydraulic oscillator, the hydraulic piston is rotatably mounted on the cylinder, and an inclined groove for amplitude adjustment is formed on the circumferential surface of the hydraulic piston on the constant pressure chamber side, and the constant pressure of the hydraulic piston is adjusted between the inclined groove and the hydraulic piston. When introducing pressure oil into the spool operating oil passage, which communicates with the chamber through a communication hole and communicates the constant pressure side of the hydraulic piston with the alternating pressure side of the pilot valve, through the inclined groove for amplitude adjustment, 1. An amplitude adjustment device for a hydraulic oscillator, characterized in that the amplitude is adjusted by adjusting a piston circuit.