JP2009274597A - Stabilizer control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely restrain influences of thermal expansion and the like of a fluid stored in each cylinder by a valve device and an accumulator with a simple and inexpensive structure, in a stabilizer control device, in which a front wheel side cylinder and a rear wheel side cylinder are arranged to stabilizer bars before and after a vehicle. <P>SOLUTION: A valve device MV blocking a communication path between a front wheel side cylinder FC and a rear wheel side cylinder RC comprises a spool valve 20, first energization means B1, and second energization means B2. An upper communication path UP is communicated with a first pressure chamber C1, and a lower communication path LP is communicated with a second pressure chamber C2. When pressures in both of the pressure chambers are equal to each other, the upper communication path and the lower communication path are communicated with an accumulator Acc. When the pressures in both of the pressure chambers are different, communication between the chambers are blocked by the spool valve. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stabilizer control device for a vehicle, and more particularly, to a stabilizer control device capable of suppressing rolling motion of a vehicle by a stabilizer bar supported between left and right wheels before and after the vehicle.

  As a device for suppressing rolling motion of a vehicle, a stabilizer device in which a torsion bar is disposed between left and right wheels of the vehicle is generally known, and the torsion bar is called a stabilizer bar. According to this, when a relative displacement difference is generated in the suspension stroke between the left and right wheels, it acts as a torsion spring, and the rolling motion of the vehicle can be suppressed. For example, the following Patent Document 1 aims to provide a “rigidity switching type stabilizer device that prevents the vehicle posture from becoming unstable when the movable cylinder is locked”. A small rod and an oil hole are drilled in the cylinder body of a single rod type movable cylinder at both ends and neutral positions of the piston stroke area, and both the small hole and the oil hole communicate with an accumulator through an oil passage. A device is proposed in which an external pilot operated type operation check valve for controlling the flow of oil toward the accumulator is provided in the oil passage from the engine.

  Further, the following Patent Document 2 states that “a vehicle rolling motion and a pitching motion are appropriately performed by a front wheel side stabilizer device connected between wheels ahead of the vehicle and a rear wheel side stabilizer device connected between wheels behind the vehicle. For the purpose of providing a vehicle attitude control device that can be easily disposed on the vehicle, and among the two pressure chambers in each of the fluid-driven front wheel side intermittent means and the rear wheel side intermittent means, A pair of communication passages that connect the pressure chambers on the side where pressure increases when the rear wheel side stabilizer bar and the front wheel side stabilizer bar are driven in the same direction with respect to the vehicle, and a connection that connects these communication passages A first on-off valve that opens and closes the communication path, and a second on-off valve that opens and closes the connection path. To switch Configuration "for it has been proposed. Furthermore, “accumulators connected to the pair of communication paths and containing a part of the fluid sealed in the pair of communication paths, and each communication path interposed between the accumulator and the pair of communication paths. And the third pressure chamber of each of the front wheel side intermittence means and the rear wheel side intermittence means to open and close the third and fourth onoff valves. It is preferable that the fluid pressure of the fluid is maintained at a predetermined pressure. ”Thus,“ even if the fluid is thermally expanded, it can be appropriately compensated by the accumulator. For example, even when air is mixed into the fluid during fluid filling, the fluid pressure in the two pressure chambers can be maintained at a predetermined pressure by the accumulator. "

  Furthermore, the stabilizer control apparatus which can adjust the relationship of the stabilizer bar before and behind the vehicle similarly to the apparatus of patent document 2 is also marketed. Although not shown, the front wheel side stabilizer bar that supports both ends on the front wheel of the vehicle and the vehicle body, the first piston that supports one end on the left and right sides thereof, and the upper side of the vehicle via the first piston A front wheel side cylinder having a first housing that forms a pressure chamber on the side and a pressure chamber on the vehicle lower side and is supported by the vehicle body, a rear wheel side stabilizer bar that supports both ends of the vehicle at the rear of the vehicle and is supported by the vehicle body, A rear wheel having a second piston that supports one end on the left and right sides thereof, and a second housing that supports the vehicle body by forming a pressure chamber on the vehicle upper side and a pressure chamber on the vehicle lower side via the second piston. A side cylinder is provided. And an upper communication path that connects the pressure chamber on the vehicle upper side of the front wheel side cylinder and the pressure chamber on the vehicle upper side of the rear wheel side cylinder, a pressure chamber on the vehicle lower side of the front wheel side cylinder, and the rear wheel side cylinder. There is provided a valve device for intermittently communicating with the lower communication passage for communicating with the pressure chamber on the vehicle lower side of the vehicle, and the fluid accommodated in the front wheel side cylinder and the rear wheel side cylinder via this valve device is provided. The pressure is maintained at a predetermined pressure by an accumulator.

Japanese Patent Publication No. 7-77846 JP 2008-80906 A

  The devices described in the above-mentioned Patent Documents 1 and 2 both relate to fluid-driven stabilizer control, and the power corresponding to the vehicle behavior is not used for controlling the torsional force without using power such as an electric motor. Is being used. Also, any device is provided with an accumulator, which can compensate for the thermal expansion of the fluid. However, the device described in Patent Document 1 requires an external pilot operated type operation check valve, and the device described in Patent Document 2 requires third and fourth on-off valves. Further, the above-described commercially available valve device is also complicated and expensive.

  Therefore, the present invention provides a stabilizer control device in which a front wheel side cylinder and a rear wheel side cylinder are arranged on a stabilizer bar supported between left and right wheels before and after a vehicle, and a communication path between the two is intermittently connected by a valve device. An object of the present invention is to reliably suppress the influence of thermal expansion or the like of the fluid accommodated in each cylinder by using an inexpensive valve device and an accumulator connected to the valve device.

  In order to achieve the above object, according to the present invention, a front wheel side stabilizer bar that supports both ends of a front wheel of a vehicle and a vehicle body and a left and right side of the front wheel side stabilizer bar as described in claim 1. A first piston that supports one end thereof, and a front wheel cylinder having a first housing that forms a pressure chamber on the vehicle upper side and a pressure chamber on the vehicle lower side through the first piston and supports the vehicle body. A rear wheel side stabilizer bar that supports both ends of the vehicle rear wheel and the vehicle body, a second piston that supports one end on the left and right sides of the rear wheel side stabilizer bar, and the second piston. A rear wheel side cylinder having a second housing that forms a pressure chamber on the upper side of the vehicle and a pressure chamber on the lower side of the vehicle and supports the vehicle body, and a pressure chamber on the upper side of the front wheel side cylinder and the front An upper communication passage that communicates with the pressure chamber on the vehicle upper side of the rear wheel side cylinder, a pressure chamber on the vehicle lower side of the front wheel side cylinder, and a pressure chamber on the vehicle lower side of the rear wheel side cylinder are connected in communication. A lower communication passage, a valve device that is interposed between the lower communication passage and the upper communication passage, and is connected to the front wheel side cylinder and the rear wheel side cylinder via the valve device. In a stabilizer control device provided with an accumulator for maintaining a stored fluid at a predetermined pressure, the valve device includes a valve housing, and the first pressure chamber and the second pressure stored in the valve housing. A spool valve that forms a chamber, a first biasing means that biases the spool valve in the direction of the second pressure chamber, and a second biasing member that biases the spool valve in the direction of the first pressure chamber. Energizing Comprising a step, wherein the upper communication path is in communication with the first pressure chamber, and the lower communication path is in communication with the second pressure chamber, and the pressure in the first pressure chamber When the pressure in the second pressure chamber and the pressure in the second pressure chamber are equal, the upper communication passage and the lower communication passage are communicated with the accumulator through the spool valve, and the pressure in the first pressure chamber and the second pressure chamber are When the pressures in the pressure chambers are different, the spool valve is configured to block the communication between the upper communication path, the lower communication path, and the accumulator.

  The first urging means and the second urging means include a pair of retainers, a compression spring interposed between the pair of retainers, and a compression spring, respectively. The movement of the pair of retainers due to the biasing force is restricted, the maximum axial distance between the pair of retainers is set to a predetermined distance, and the compression spring is compressed in the compression direction against the biasing force of the compression spring. It is good to comprise by the spring unit provided with the rod member which accept | permits a movement of a pair of retainer.

  Further, according to a third aspect of the present invention, the apparatus further comprises a first branch path that branches from the upper communication path and has an orifice, and a second branch path that branches from the lower communication path and has an orifice, When the pressure in one pressure chamber is equal to the pressure in the second pressure chamber, the first branch path and the second branch path are communicated to the accumulator via the spool valve, and the first pressure When the pressure in the room and the pressure in the second pressure chamber are different, the spool valve may be configured to block communication between the first branch path, the second branch path, and the accumulator. The orifices of the first branch path and the second branch path can be provided in any one of a valve housing and a spool valve of the valve device.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, the stabilizer control device configured as described in claim 1 includes a valve device including a valve housing, a spool valve, a first urging means, and a second urging means, and the first When the upper communication path is connected to the pressure chamber and the lower communication path is connected to the second pressure chamber, the pressure in the first pressure chamber is equal to the pressure in the second pressure chamber. The upper communication path and the lower communication path are connected to the accumulator via the spool valve, and when the pressure in the first pressure chamber is different from the pressure in the second pressure chamber, the upper communication path and the lower communication path are different depending on the spool valve. In addition, the valve device having a simple and inexpensive structure is configured to cut off the mutual communication between the accumulator and the accumulator. It is possible to suppress the grayed movement. In the present invention, the spool valve only needs to be slidably fitted to the valve housing with a minute gap, and it is preferable to allow a slight leakage without requiring a perfect sealing performance. Since precision processing is not necessary, it can be manufactured at low cost.

  In particular, if the first and second urging means are constituted by a spring unit as described in claim 2, the initial position of the spool valve is reliably set by setting a predetermined initial load and a maximum axial length. It can be set, and is easy to assemble and can be configured at low cost. For example, when the pressure in the first pressure chamber in the valve housing is equal to the pressure in the second pressure chamber, the upper communication path and the lower communication path communicate with the accumulator via the spool valve in the neutral position. In addition, the initial position of the spool valve can be set.

  Furthermore, if the orifice is provided as described in claims 3 and 4, the influence of pressure fluctuation between the front wheel side cylinder and the rear wheel side cylinder can be suppressed, and stable operation can be ensured.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the overall configuration of a stabilizer control device according to an embodiment of the present invention will be described with reference to FIG. Both ends of the front wheel side stabilizer bar FS are supported by wheels FL and FR on the left and right front sides of the vehicle, and an intermediate portion thereof is supported by a vehicle body (not shown) via mounts FM1 and FM2 at two left and right support portions. In the present embodiment, a front wheel side cylinder FC is interposed between the left mount FM1 which is one of these support portions and the vehicle body. Similarly, both ends of the rear wheel side stabilizer bar RS are supported by the left and right rear wheels RL and RR of the vehicle, and an intermediate portion thereof is supported at two left and right support portions on the vehicle body (not shown) via mounts RM1 and RM2. Supported. A rear wheel side cylinder RC is interposed between the same left mount RM1 as the front wheel side cylinder FC and the vehicle body. The front wheel side cylinder FC and the rear wheel side cylinder RC are connected in communication with a valve device MV, and the valve device MV is connected in communication with an accumulator Acc.

  FIG. 1 shows the configuration of the front wheel side cylinder FC, the rear wheel side cylinder RC, and the valve device MV and their mutual connection relationship. FIG. 2 shows a specific structure of the valve device MV. As shown in FIG. 1, the front wheel side cylinder FC has a first piston P1 that supports one end on the front wheel side stabilizer bar FS (via the mount FM1 in FIG. 5), and a vehicle upper side via the first piston P1. A first housing H1 that forms a pressure chamber U1 on the side and a pressure chamber L1 on the vehicle lower side and is supported by a vehicle body (not shown). Similarly, the rear wheel side cylinder RC has a second piston P2 that supports one end of the rear wheel side stabilizer bar RS (via the mount RM1 in FIG. 5) and a second piston P2 on the vehicle upper side via the second piston P2. It has a second housing H2 that forms a pressure chamber U2 and a pressure chamber L2 on the lower side of the vehicle and is supported by a vehicle body (not shown). The pressure chamber U1 and the pressure chamber U2 on the upper side of the vehicle are connected in communication by the upper side communication path UP, and the pressure chamber L1 and pressure chamber L2 on the lower side of the vehicle are connected in communication by the lower side communication path LP. Further, a valve device MV having the following configuration is interposed between the upper communication path UP and the lower communication path LP.

  As shown in FIG. 1, in the valve device MV of this embodiment, a single valve body spool valve 20 is accommodated in a valve housing 10, and a first pressure chamber C1 and a second pressure chamber C2 are provided on both sides thereof. Is formed. In the first pressure chamber C1 and the second pressure chamber C2, a first urging means B1 for urging the spool valve 20 in the direction of the second pressure chamber C2 and the spool valve 20, respectively. The second urging means B2 for urging in the direction of the first pressure chamber C1 is accommodated, the upper communication path UP is connected to the first pressure chamber C1, and the lower communication path LP is the first. The two pressure chambers C2 are connected in communication. When the pressure in the first pressure chamber C1 is equal to the pressure in the second pressure chamber C2, the upper communication passage UP and the lower communication passage LP are connected to the accumulator Acc (the communication passage AB) via the spool valve 20. ), And when the pressure in the first pressure chamber C1 and the pressure in the second pressure chamber C2 are different, the spool valve 20 causes the upper communication path UP, the lower communication path LP, and the accumulator Acc (communication path of the accumulator Acc). The communication between AB) is cut off.

  Furthermore, in this embodiment, as shown in FIG. 1, a first branch path UB that branches from the upper communication path UP and a second branch path LB that branches from the lower communication path LP are formed. , Respectively, orifices (throttles) T1 and T2 are formed. These orifices T1 and T2 are formed in the valve housing 10 in FIG. 1, but may be formed on the spool valve 20 side as shown in FIG. The first urging means B1 and the second urging means B2 are configured as shown in FIGS. 1 and 2, and will be described below with reference to FIG.

  FIG. 2 shows a specific structure of the valve device MV in the present embodiment. In the bottomed cylinder hole formed in the valve housing 10, the plug 11, the cylinder 12, the spool valve 20, and the plug 13 are opened from the opening side. And 14 are accommodated in this order, and the screw 15 is screwed and sealed. The plugs 11 and 13 have the same shape, and the cylinder 12 and the spool valve 20 are formed symmetrically. The valve housing 10 is formed with communication paths (represented by UP, LP, and AB in FIG. 2) that communicate with each of the upper communication path UP, the lower communication path LP, and the communication path AB for the accumulator Acc. The plugs 11 and 13 each have a communication path UPs that connects the upper communication path UP to the first pressure chamber C1, and a communication path that connects the lower communication path LP to the second pressure chamber C2. LPs are formed. The plugs 11 and 13 and the cylinder 12 are formed with annular communication paths (represented by UB and LB, respectively) that constitute the first and second branch paths UB and LB. A communication path UBs that communicates with the first branch path UB, a communication path LBs that communicates with the second branch path LB, and a communication path ABs that communicates with the communication path AB are formed. The spool valve 20 may be slidably fitted to the cylinder 12 with a minute gap, and it is not necessary to ensure complete sealing performance.

  The spool valve 20 is formed with receiving holes 21 and 22 for the first urging means B1 and the second urging means B2 from both ends toward the center, and a communication hole 23 penetrating in the axial direction. Formed and closed on both sides. In the communication hole 23, orifices T1, T2 and T3 are formed at positions facing the communication paths UBs, ABs and LBs when the spool valve 20 is in the neutral position, and the communication path UBs is formed through these. , ABs and LBs communicate with the communication hole 23, and thus can be communicated with the first pressure chamber C1 and the second pressure chamber C2. Due to the presence of these orifices T1, T2, and T3, the movement of the fluid when the differential pressure is generated (when the pressure fluctuates) is suppressed, and thus the smooth operation of the spool valve 20 can be ensured. In FIG. 2, the orifice T3 is also provided for the communication path ABs, but this may be omitted as shown in FIG.

  The first urging means B1 and the second urging means B2 have the same configuration, and a compression spring 33 and a rod member 34 are interposed between the pair of retainers 31 and 32, respectively. Has been. That is, the rod member 34 includes a rod 35 and locking end portions 36 and 37 integrally formed at both ends thereof, and the movement of the retainers 31 and 32 is restricted against the urging force of the compression spring 33. The maximum axial distance between the retainers 31 and 32 is set to a predetermined distance, and the retainers 31 and 32 are allowed to move in the compression direction of the compression spring 33. As described above, when the spring unit in which the set height (axial length) and the set load of the compression spring 33 are restricted is arranged on both sides of the symmetrical spool valve 20 in a slightly biased state, the first When the pressure chamber C1 and the second pressure chamber C2 have the same pressure, the spool valve 20 is held in the neutral position.

  The operation of the stabilizer control device having the above configuration will be described. FIGS. 1 and 2 show a state when the spool valve 20 is in the neutral position, and the upper communication passage UP (pressure chamber U1 and pressure chamber U1 and The pressure chamber U2), the lower communication path LP (the pressure chamber L1 and the pressure chamber L2), and the accumulator Acc communicate with each other and are filled with a fluid pressurized to a predetermined pressure. That is, FIG. 1 shows the pressure in the pressure chamber U1 and pressure chamber U2 on the upper side of the vehicle (referred to as Pu), the pressure in the pressure chamber L1 and pressure chamber L2 on the lower side of the vehicle (referred to as Pl), and the inside of the accumulator Acc. This is a state (Pu = Pa = Pl) when pressures (Pa) are equal.

  From the state of Pu = Pa = Pl shown in FIG. 1, when the pressure in the pressure chamber U1 and the pressure chamber U2 on the vehicle upper side becomes the high pressure side and the relationship of Pu> Pa> Pl is established, the compression spring 33 on the low pressure side is compressed. 3 (the B2 side is compressed), the spool valve 20 causes the upper communication path UP (pressure chamber U1 and pressure chamber U2), the lower communication path LP (pressure chamber L1 and pressure chamber L2), and the accumulator Acc. Mutual communication is blocked. Conversely, when the pressure in the pressure chamber L1 and the pressure chamber L2 on the vehicle lower side becomes the high pressure side and the relationship of Pu <Pa <Pl is established, the state shown in FIG. The communication path UP (pressure chamber U1 and pressure chamber U2), the lower side communication path LP (pressure chamber L1 and pressure chamber L2), and the accumulator Acc are mutually disconnected. Thus, when the pressure in the first pressure chamber C1 and the pressure in the second pressure chamber C2 are different, the upper communication path UP, the lower communication path LP, and the accumulator Acc are mutually disconnected by the spool valve 20. Is done.

  Note that the pressure (ΔP) at which the spool valve 20 starts to move from the state of Pu = Pa = Pl shown in FIG. 1 is approximately (if the sliding resistance of the spool valve 20 etc. is ignored) set load (F ) And the pressure receiving area (S) of the spool valve 20 (F / S = ΔP).

  Thus, when the vehicle turns, the pressure in the first pressure chamber C1 and the pressure in the second pressure chamber C2 are different as shown in FIG. Since the communication between the communication path UP, the lower communication path LP, and the accumulator Acc is blocked, fluid movement in the upper communication path UP and the lower communication path LP does not occur, so the front wheel side stabilizer bar FS and the rear wheel side stabilizer are not generated. Each of the bars RS exhibits a desired stabilizer function and can suppress the rolling motion of the vehicle body.

  On the other hand, when the vehicle (not shown) is traveling straight and moves up and down substantially parallel to the road surface, the state shown in FIG. The LP and the accumulator Acc communicate with each other via the valve device MV so that the fluid can freely move, and the thermal expansion and contraction of the fluid are appropriately absorbed by the accumulator Acc. At this time, the front wheel side stabilizer bar FS and the rear wheel side stabilizer bar RS are not restrained by the front wheel side cylinder FC and the rear wheel side cylinder RC, and do not exhibit the stabilizer function. Further, when the vertical movements of the pistons P1 and P2 of the front wheel side cylinder FC and the rear wheel side cylinder RC are different before and after the vehicle when traveling on a rough road, the fluid moves in the upper communication path UP and the lower communication path LP. The front wheel side stabilizer bar FS and the rear wheel side stabilizer bar RS ensure a large stroke for each wheel without exhibiting the stabilizer function.

It is sectional drawing which shows the basic composition of the valve apparatus in one Embodiment of this invention, a front wheel side cylinder, and a rear-wheel side cylinder. It is sectional drawing which shows the specific structural example of the valve apparatus in one Embodiment of this invention. It is sectional drawing which shows the operating state of the valve apparatus in one Embodiment of this invention, a front wheel side cylinder, and a rear-wheel side cylinder. It is sectional drawing which shows the operating state of the valve apparatus in one Embodiment of this invention, a front wheel side cylinder, and a rear-wheel side cylinder. It is a perspective view showing the whole composition of the stabilizer control device concerning one embodiment of the present invention.

Explanation of symbols

FS Front wheel side stabilizer bar RS Rear wheel side stabilizer bar FC Front wheel side cylinder RC Rear wheel side cylinder H1, H2 Housing UP Upper side communication path LP Lower side communication path UB First branch path LB Second branch path Acc Accumulator C1 First 1 pressure chamber C2 2nd pressure chamber B1 1st urging means B2 2nd urging means T1, T2, T3 Orifice MV Valve device 10 Valve housing 20 Spool valve 31, 32 Retainer 33 Compression spring 34 Rod member

Claims (4)

  A front wheel side stabilizer bar that supports both ends of the front wheel of the vehicle and a vehicle body, a first piston that supports one end on the left and right sides of the front wheel side stabilizer bar, and a vehicle upper side through the first piston A front wheel side cylinder having a first housing that forms a pressure chamber on the side of the vehicle and a pressure chamber on the vehicle lower side and is supported by the vehicle body, and a rear wheel side stabilizer bar that is supported by the vehicle body at both ends and supported by the vehicle body And a second piston that supports one end on the left and right sides of the rear wheel side stabilizer bar, and a pressure chamber on the vehicle upper side and a pressure chamber on the vehicle lower side through the second piston. A rear wheel side cylinder having a second housing to be supported; an upper side communication connecting the pressure chamber on the vehicle upper side of the front wheel side cylinder and the pressure chamber on the vehicle upper side of the rear wheel side cylinder; A road, a lower communication passage connecting the pressure chamber on the vehicle lower side of the front wheel side cylinder and a pressure chamber on the vehicle lower side of the rear wheel side cylinder, the lower communication passage and the upper communication passage In a stabilizer control device comprising a valve device that is interposed between the two, and an accumulator that maintains fluid stored in the front wheel side cylinder and the rear wheel side cylinder through the valve device at a predetermined pressure, The valve device includes a valve housing, a spool valve housed in the valve housing and forming a first pressure chamber and a second pressure chamber in the valve housing, and the second pressure chamber with respect to the spool valve. A first urging means for urging in the direction and a second urging means for urging the spool valve in the direction of the first pressure chamber, wherein the upper communication path is defined by the first pressure. Connect to room In addition, the lower communication path is connected to the second pressure chamber, and when the pressure in the first pressure chamber is equal to the pressure in the second pressure chamber, the upper communication path is connected via the spool valve. The side communication passage and the lower communication passage communicate with the accumulator, and when the pressure in the first pressure chamber and the pressure in the second pressure chamber are different, the upper communication passage and the lower communication passage are separated by the spool valve. A stabilizer control device configured to block communication between a passage and the accumulator.   The first urging means and the second urging means respectively include a pair of retainers, a compression spring interposed between the pair of retainers, and the movement of the pair of retainers by the urging force of the compression spring. And the maximum axial distance between the pair of retainers is set to a predetermined distance, and the rod is allowed to move in the compression direction of the compression spring against the urging force of the compression spring. The stabilizer control device according to claim 1, comprising a spring unit including a member.   A first branch passage branched from the upper communication passage and having an orifice; and a second branch passage branched from the lower communication passage and having an orifice; and the pressure in the first pressure chamber and the second branch passage When the pressure in the pressure chamber is equal, the first branch path and the second branch path are communicated to the accumulator via the spool valve, and the pressure in the first pressure chamber and the pressure in the second pressure chamber are 2. The stabilizer control device according to claim 1, wherein when the pressures are different, the spool valve is configured to block communication between the first branch path, the second branch path, and the accumulator.   4. The stabilizer control device according to claim 3, wherein the orifices of the first branch path and the second branch path are provided in any one of a valve housing and a spool valve of the valve device. 5.

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