Hydraulic control brake valve

Abstract

The hydraulic control brake valve comprises a valve body, a valve rod, a first spring, a valve sleeve and a feedback valve element, an inner cavity is formed in the valve body, the valve rod is inserted into the inner cavity and is in sliding connection with the valve body, the valve sleeve is inserted into the inner cavity and is fixed relative to the position of the valve body, and the two ends of the first spring are connected with the valve rod and the main valve element correspondingly; the main valve element is located in a valve sleeve inner cavity of the valve sleeve and connected with the valve sleeve in a sliding mode, a main valve element inner cavity is formed in the main valve element, the feedback valve element is inserted into the main valve element inner cavity, the main valve element is connected with the feedback valve element in a sliding mode, and the main valve element inner cavity is communicated with the valve sleeve inner cavity. The main valve element inner cavity is formed in the main valve element and blocked through the feedback valve element, so that hydraulic oil acts on the inner wall of the upper end of the main valve element to provide upward feedback force, the magnitude of the feedback force is directly separated from the main valve element, the diameter of the main valve element continues to be increased, the flow is increased, and the action speed of the brake is increased; the braking speed is accelerated, and the safety is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulically controlled brake valves, in particular to a hydraulically controlled brake valve. Background Art

[0002] In the existing brake valve, increasing the flow rate of the brake oil port can speed up the brake action and make the brake reaction faster. At present, in order to increase the flow rate, the diameter of the valve core is usually increased. As the diameter of the valve core increases, its end surface area increases, and the feedback force under the same pressure will also increase. Excessive feedback force will cause excessive resistance when the driver steps on the pedal, which is easy to cause fatigue in the driver's legs. Therefore, the valve core diameter in the existing technology cannot be further increased to increase the flow rate, and thus the braking speed cannot be further increased, and the safety during driving cannot be further improved.

[0003] Moreover, the pedal angle of the existing brake valve is not adjustable, and different drivers cannot step on the pedal comfortably due to their different body shapes. Stepping on the pedal with an uncomfortable posture for a long time is more likely to deepen the driver's fatigue, which is not conducive to the driver's safe driving. Summary of the invention

[0004] The present invention aims to solve the above problems and provides a hydraulically controlled brake valve to solve the above problems.

[0005] A hydraulically controlled brake valve comprises: a valve body, a valve stem, a first spring, a valve sleeve and a feedback valve core, the valve body is formed with an inner cavity, the valve stem is inserted into the inner cavity and is slidably connected to the valve body, the valve sleeve is inserted into the inner cavity and is fixed relative to the valve body, the two ends of the first spring are respectively connected to the valve stem and the main valve core, the main valve core is located in the valve sleeve inner cavity of the valve sleeve and is slidably connected to the valve sleeve, the main valve core is formed with a main valve core inner cavity, the feedback valve core is inserted into the main valve core inner cavity, the main valve core is slidably connected to the feedback valve core, and the main valve core inner cavity is communicated with the valve sleeve inner cavity.

[0006] Furthermore, the valve body is respectively formed with a brake oil port, a tank oil port and a pressure oil port, the two ends of the valve sleeve are respectively connected to the tank oil port, the side of the valve sleeve is respectively formed with a first through hole and a second through hole axially, the first through hole is connected to the brake oil port, and the second through hole is connected to the pressure oil port.

[0007] Furthermore, the main valve core is formed with a third through hole, and the third through hole is respectively connected with the inner cavity of the main valve core and the first through hole.

[0008] Furthermore, an annular groove is formed on the outer side of the main valve core, and the annular groove connects the brake oil port with the oil tank oil port and the pressure oil port respectively through axial movement.

[0009] Furthermore, a third spring is included, and the third spring is located in the inner cavity of the main valve core. Two ends of the third spring are respectively in contact with the inner wall of the main valve core and the feedback valve core.

[0010] Furthermore, it also includes a second spring, the two ends of which are in contact with the valve stem and the valve sleeve respectively; it also includes a spring seat, the two ends of the first spring are in contact with the valve stem and the spring seat respectively, and the end of the spring seat away from the first spring is movably connected to the main valve core.

[0011] Preferably, a spherical protrusion is formed at the end of the main valve core, and the spherical protrusion is inserted into the groove of the spring seat.

[0012] Furthermore, a fourth cavity is formed between the valve stem and the valve sleeve, and the fourth cavity is communicated with the oil port of the oil tank. A first cavity is formed between the main valve core and the valve body, and the first cavity is communicated with the oil port of the oil tank.

[0013] Furthermore, it also includes a locking ring and a driving mechanism, the part of the valve stem extending out of the inner cavity is fixedly and detachably connected to the locking ring, the position of the locking ring along the axial direction of the valve stem is adjustable, and the driving mechanism drives the locking ring to move up and down.

[0014] Preferably, the driving mechanism includes a base, a boot sleeve, a pressure plate, a first screw, a pedal and a rotating block. The top of the valve body is fixedly connected to the base, the pressure plates at both ends of the boot sleeve are fixedly connected to the base, the rotating block is rotatably connected to the base, the axial position of the first screw relative to the rotating block is adjustable, the first screw is in contact with the pressure plate, and the pedal is fixed relative to the rotating block.

[0015] More preferably, the driving mechanism further comprises a second screw, the axial position of the second screw relative to the rotating block is adjustable, and the second screw is in contact with the rotating block.

[0016] Furthermore, the valve body is also formed with a control oil port, and a fifth cavity is formed between the step surface of the valve stem and the valve body, and the fifth cavity is communicated with the control oil port.

[0017] Furthermore, two inner cavities are formed in the valve body, and each inner cavity is slidably connected to a different valve stem.

[0018] The present invention has the following advantages: 1. By setting a main valve core inner cavity in the main valve core and using a feedback valve core to block it, the hydraulic oil acts on the inner wall of the upper end of the main valve core to provide an upward feedback force, so that the feedback force is directly separated from the main valve core, so that the main valve core diameter continues to increase, the flow rate increases, the brake action speed is increased, the braking speed is accelerated, and the safety is improved; 2. The output pressure can be changed by changing the axial position of the locking ring relative to the valve stem. The first spring can be replaced without disassembling the valve stem for adjustment, which reduces the number of disassembled parts and improves the adjustment speed; 3. A rotating block is added between the base and the pedal, and the angle of the pedal relative to the rotating block is changed by a second screw with adjustable axial position, so that adaptive adjustment can be made according to the feet of different drivers, making the driver more comfortable when stepping on the pedal, reducing fatigue and reducing the risk of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 : A stereogram of the present invention; Figure 2 : A side view of the present invention; Figure 3 : Figure 2 Sectional view at AA in the middle; Figure 4 : Figure 3 A partial enlarged view of point C in the middle; Figure 5 : The front view of the present invention; Figure 6 : Figure 5 Cross-sectional view at the middle BB. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and examples: Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. like Figures 1 to 6 As shown, a hydraulically controlled brake valve comprises: a valve body 1, a valve stem 2, a first spring 3, a valve sleeve 6 and a feedback valve core 8, the valve body 1 is formed with an inner cavity, the valve stem 2 is inserted into the inner cavity and is slidably connected to the valve body 1, the valve sleeve 6 is inserted into the inner cavity and is fixed relative to the valve body 1, the two ends of the first spring 3 are respectively connected to the valve stem 2 and the main valve core 9, the main valve core 9 is located in the valve sleeve inner cavity 63 of the valve sleeve 6 and is slidably connected to the valve sleeve 6, the main valve core 9 is formed with a main valve core inner cavity 92, the feedback valve core 8 is inserted into the main valve core inner cavity 92, the main valve core 9 is slidably connected to the feedback valve core 8, and the main valve core inner cavity 92 is communicated with the valve sleeve inner cavity 63.

[0024] Furthermore, the valve body 1 is respectively formed with a brake oil port B, a tank oil port T and a pressure oil port P, and both ends of the valve sleeve 6 are respectively connected to the tank oil port T, and the side of the valve sleeve 6 is respectively formed with a first through hole 61 and a second through hole 62 axially, wherein the first through hole 61 is connected to the brake oil port B, and the second through hole 62 is connected to the pressure oil port P.

[0025] Preferably, a second chamber 14 and a third chamber 15 are formed between the outer side of the valve sleeve 6 and the valve body 1 , and the second chamber 14 and the third chamber 15 are communicated with the brake oil port B and the pressure oil port P respectively.

[0026] Furthermore, the main valve core 9 is formed with a third through hole 91 , and the third through hole 91 is communicated with the main valve core inner cavity 92 and the first through hole 61 respectively.

[0027] Furthermore, an annular groove 90 is formed on the outer side of the main valve core 9, and the annular groove 90 connects the brake oil port B with the oil tank oil port T and the pressure oil port P respectively through axial movement.

[0028] Furthermore, a third spring 7 is included, and the third spring 7 is located in the inner cavity 92 of the main valve core, and two ends of the third spring 7 are in contact with the inner wall of the main valve core 9 and the feedback valve core 8 respectively.

[0029] Furthermore, it also includes a second spring 4, the two ends of which are in contact with the valve stem 2 and the valve sleeve 6 respectively; it also includes a spring seat 5, the two ends of the first spring 3 are in contact with the valve stem 2 and the spring seat 5 respectively, and the end of the spring seat 5 away from the first spring 3 is movably connected to the main valve core 9.

[0030] Preferably, a spherical protrusion 93 is formed at the end of the main valve core 9, and the spherical protrusion 93 is inserted into the groove of the spring seat 5. The main valve core 9 can rotate around the spherical protrusion 93, which can reduce the precision requirements for the spring seat 5 and the main valve core 9.

[0031] Furthermore, a fourth cavity 16 is formed between the valve stem 2 and the valve sleeve 6 , and the fourth cavity 16 is connected to the oil tank port T. A first cavity 13 is formed between the main valve core 9 and the valve body 1 , and the first cavity 13 is connected to the oil tank port T.

[0032] Furthermore, it also includes a locking ring 10 and a driving mechanism, the portion of the valve stem 2 extending out of the inner cavity is fixedly and detachably connected to the locking ring 10, the locking ring 10 is adjustable in position along the axial direction of the valve stem 2, and the driving mechanism drives the locking ring 10 to move up and down. Preferably, the locking ring 10 is threadedly connected to the valve stem 2 or the locking ring 10 is clamped and fixed to the valve stem 2.

[0033] Preferably, the driving mechanism includes a base 20, a boot sleeve 21, a pressure plate 22, a first screw 23, a pedal 24 and a rotating block 25. The top of the valve body 1 is fixedly connected to the base 20, the pressure plates 22 at both ends of the boot sleeve 21 are fixedly connected to the base 20, the rotating block 25 is rotatably connected to the base 20, the axial position of the first screw 23 relative to the rotating block 25 is adjustable, the first screw 23 is in contact with the pressure plate 22, and the pedal 24 is fixed relative to the rotating block 25.

[0034] More preferably, the driving mechanism further comprises a second screw 26, the axial position of the second screw 26 relative to the rotating block 25 is adjustable, and the second screw 26 contacts the rotating block 25. By adjusting the axial position of the second screw 26, the angle of the pedal 24 can be adjusted to adapt to the feet of different drivers.

[0035] Furthermore, the valve body 1 is also formed with a control oil port PX, and a fifth cavity 19 is formed between the step surface of the valve stem 2 and the valve body 1 , and the fifth cavity 19 is communicated with the control oil port PX.

[0036] Furthermore, two inner chambers are formed in the valve body 1, and each inner chamber is slidably connected to a different valve stem 2. The brake oil ports B corresponding to the two parallel inner chambers are respectively connected to the brakes of the front axle and the brakes of the rear axle, the tank oil ports T and the pressure oil ports P corresponding to the two parallel inner chambers can be connected to the same oil tank and hydraulic source, and the control oil ports PX corresponding to the two parallel inner chambers can be respectively connected to two different oil cylinders or the same oil cylinder.

[0037] Working principle: The brake oil port B is connected to the brake, the tank oil port T is connected to the oil tank, the pressure oil port P is connected to the hydraulic source, and the control oil port PX is connected to the hydraulic control oil circuit.

[0038] When not in braking state, Figure 3 As shown, there is a gap between the main valve core 9 and the upper end of the valve sleeve 6, and the brake oil port B is connected to the oil tank oil port T. At this time, the brake is not in action.

[0039] When braking, the valve stem 2 moves downward, compressing the first spring 3 and driving the main valve core 9 to move downward. The gap between the main valve core 9 and the upper end of the valve sleeve 6 disappears, and the brake oil port B is disconnected from the oil tank oil port T. At this time, the annular groove 90 moves downward to connect the first through hole 61 and the second through hole 62 that were originally disconnected. The hydraulic oil enters the brake from the pressure oil port P through the third chamber 15, the second through hole 62, the annular groove 90, the first through hole 61, the second chamber 14 and the brake oil port B in sequence, driving the brake to brake the vehicle.

[0040] There are two ways to drive the valve stem 2 to move downward. One is that the driver steps on the pedal 24, which causes the first screw 23 to drive the pressure plate 22 to move downward. The pressure plate 22 contacts the locking ring 10 and drives the valve stem 2 to move downward. The other is that hydraulic oil is introduced into the fifth chamber 19 from the control oil port PX. The hydraulic oil acts on the step surface of the valve stem 2 to drive the valve stem 2 to move downward. The fifth chamber 19 is located between the first seal 17 and the second seal 18. The first seal 17 and the second seal 18 are used to seal the valve stem 2 and the valve body 1.

[0041] During the braking process, the main valve core cavity 92, which was originally connected to the oil tank port T, is connected to the pressure oil port P. The hydraulic oil enters the upper part of the feedback valve core 8 from the third through hole 91, and acts on the inner wall of the upper end of the main valve core cavity 92, giving the main valve core 9 an upward feedback force. The feedback force is transmitted upward to the valve stem 2, and then to the pedal 24, and the feedback force gradually increases with the stepping amplitude of the pedal 24.

[0042] The hydraulic oil acts on the inner wall of the upper end of the main valve core cavity 92, and the action area is smaller than the diameter of the main valve core 9. Under the same pressure, the feedback force is reduced, so that the diameter of the main valve core 9 can be further increased. As the diameter of the main valve core 9 increases, the volume of the annular groove 90 with the same radial depth increases, so that the flow rate output from the pressure oil port P to the brake oil port B per unit time increases, the action speed of the brake is improved, and the braking speed is accelerated. At the same time, the feedback force is disconnected from the diameter of the main valve core 9, so that the feedback force can be directly changed by increasing or decreasing the inner cavity of the main valve core cavity 92.

[0043] When the brake is stopped, the downward force on the main valve core 9 disappears, and the feedback force and the third spring 7 jointly drive the main valve core 9 to rise and reset; at the same time, the second spring 4 drives the valve stem 2 to reset upward. As the main valve core 9 moves upward, a gap is generated between the main valve core 9 and the upper end of the valve sleeve 6, and the first through hole 61 is disconnected from the second through hole 62. At this time, the third through hole 91 is connected to the oil tank port T, and the feedback force disappears.

[0044] When adjusting the output pressure of the brake oil port B, it can be achieved by replacing the first spring 3 with different stiffness coefficients and changing the axial position of the locking ring 10. Therefore, the brake oil ports B corresponding to the two inner cavities can output different pressures by replacing different first springs 3 and changing the axial position of the locking ring 10, so that the two corresponding brakes produce different braking effects.

[0045] It should be noted that the valve body 1 includes an outer shell 11 and a bottom plate 12, and the bottom of the outer shell 11 is fixedly connected to the bottom plate 12. The bottom of the valve sleeve 6 contacts the bottom plate 12, and the cavity below the valve sleeve inner cavity 63 in the valve sleeve 6 is connected to the oil port T of the oil tank.

[0046] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. A hydraulically controlled brake valve, It is characterized in that include: A valve body (1), a valve stem (2), a first spring (3), a valve sleeve (6) and a feedback valve core (8), wherein the valve body (1) is formed with an inner cavity, the valve stem (2) is inserted into the inner cavity and is slidably connected to the valve body (1), the valve sleeve (6) is inserted into the inner cavity and is fixed relative to the valve body (1), the two ends of the first spring (3) are respectively connected to the valve stem (2) and the main valve core (9), the main valve core (9) is located in the valve sleeve inner cavity (63) of the valve sleeve (6) and is slidably connected to the valve sleeve (6), the main valve core (9) is formed with a main valve core inner cavity (92), the feedback valve core (8) is inserted into the main valve core inner cavity (92), the main valve core (9) and the feedback valve core (8) are slidably connected, and the main valve core inner cavity (92) is connected to the valve sleeve inner cavity (63).

2. A hydraulically controlled brake valve according to claim 1, Features: The valve body (1) is respectively formed with a brake oil port (B), a tank oil port (T) and a pressure oil port (P); both ends of the valve sleeve (6) are respectively connected to the tank oil port (T); a first through hole (61) and a second through hole (62) are respectively formed axially on the side surface of the valve sleeve (6); the first through hole (61) is connected to the brake oil port (B), and the second through hole (62) is connected to the pressure oil port (P).

3. A hydraulically controlled brake valve according to claim 2, Features: The main valve core (9) is formed with a third through hole (91), and the third through hole (91) is respectively connected to the main valve core inner cavity (92) and the first through hole (61).

4. A hydraulically controlled brake valve according to claim 3, Features: An annular groove (90) is formed on the outer side of the main valve core (9), and the annular groove (90) connects the brake oil port (B) with the oil tank oil port (T) and the pressure oil port (P) respectively through axial movement.

5. A hydraulically controlled brake valve according to claim 1, Features: It also includes a third spring (7), the third spring (7) being located in the inner cavity (92) of the main valve core, and the two ends of the third spring (7) being in contact with the inner wall of the main valve core (9) and the feedback valve core (8) respectively.

6. A hydraulically controlled brake valve according to claim 1, Features: It also includes a second spring (4), the two ends of which are in contact with the valve stem (2) and the valve sleeve (6) respectively; and a spring seat (5), the two ends of which are in contact with the valve stem (2) and the spring seat (5) respectively; and the end of the spring seat (5) away from the first spring (3) is movably connected to the main valve core (9).

7. A hydraulically controlled brake valve according to claim 2, Features: A fourth chamber (16) is formed between the valve stem (2) and the valve sleeve (6), and the fourth chamber (16) is connected to the oil tank oil port (T). A first chamber (13) is formed between the main valve core (9) and the valve body (1), and the first chamber (13) is connected to the oil tank oil port (T).

8. A hydraulically controlled brake valve according to claim 1, Features: It also comprises a locking ring (10) and a driving mechanism, wherein the portion of the valve stem (2) extending out of the inner cavity is fixedly and detachably connected to the locking ring (10), the position of the locking ring (10) along the axial direction of the valve stem (2) is adjustable, and the driving mechanism drives the locking ring (10) to move up and down.

9. A hydraulically controlled brake valve according to claim 1, Features: The valve body (1) is also formed with a control oil port (PX), and a fifth chamber (19) is formed between the step surface of the valve stem (2) and the valve body (1), and the fifth chamber (19) is connected to the control oil port (PX).

10. A hydraulically controlled brake valve according to claim 1, Features: Two inner cavities are formed in the valve body (1), and each inner cavity is slidably connected to a different valve stem (2).

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