JP2015058711A - Stabilizer controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stabilizer control device that securely suppresses an influence of thermal expansion of a liquid stored in each cylinder etc., by a valve device having a simple and inexpensive structure.SOLUTION: A stabilizer control device includes a valve device MV which includes a valve body 2 in a solid column shape having an annular gap CL formed with an inner wall of a valve housing 1, and compression springs B1 and B2 energizing the valve body, and links a first pressure chamber C1, a second pressure chamber C2, and an accumulator Acc to one another through the annular gap. The valve body links the first pressure chamber and second pressure chamber to an upper side communication passage UP and a lower side communication passage LP respectively when the difference in pressure between the first pressure chamber and second pressure chamber is equal to or less than predetermined difference pressure, and cuts off the link between a low pressure-side pressure chamber and a low pressure-side communication passage when the difference in pressure between the first pressure chamber and second pressure chamber exceeds the predetermined difference pressure.

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, in Patent Document 1 below, “the upper chambers of the front wheel side fluid pressure cylinder that controls the rigidity of the front wheel side stabilizer bar and the rear wheel side fluid pressure cylinder that controls the rigidity of the rear wheel side stabilizer bar are connected to each other. A first passage, a second passage connecting the lower chambers of the front-wheel-side fluid pressure cylinder and the rear-wheel-side fluid pressure cylinder, and each of the passages connected to the first passage and the second passage. An accumulator capable of supplying and discharging a working fluid therebetween; a first control valve interposed between the first passage and the accumulator to control communication between the first passage and the accumulator; and the second passage. And a second control valve that is interposed between the accumulators and controls the communication cut-off between the second passages and the accumulators, wherein the control valves are provided in the passages. Pressure is the above A normally-open accumulator side valve portion (open / close valve portion) that shuts off the communication between each passage and the accumulator when the pressure in the accumulator is equal to or higher than a first set differential pressure, and the pressure in the accumulator A mechanical valve comprising a normally open type passage side valve portion (open / close valve portion) that blocks communication between the passages and the accumulator when the pressure is equal to or higher than a second set differential pressure from the pressure of the first control valve; Between the second control valves, the respective accumulator side valve portions are allowed to be individually closed and closed together (when one accumulator side valve portion is closed, the other accumulator side valve portion is closed, or A control member is provided that restricts both accumulator side valve portions simultaneously.) ”Has been proposed.

  Further, the following Patent Document 2 states that “a front wheel side stabilizer bar that supports both ends of the vehicle front wheel and the vehicle body, and a first piston that supports one end on the left and right sides of the front wheel side stabilizer bar, And a front wheel side cylinder having a first 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 first piston, and both ends are supported by wheels on the rear side of the vehicle. And a rear wheel side stabilizer bar supported by the vehicle body, a second piston supporting one end on the left and right sides of the rear wheel side stabilizer bar, a pressure chamber on the vehicle upper side via the second piston, and the vehicle A rear wheel side cylinder having a second housing that forms a lower pressure chamber and is supported by the vehicle body; a pressure chamber on a vehicle upper side of the front wheel side cylinder; and a vehicle upper side of the rear wheel side cylinder. An upper communication path that communicates with the force chamber, a lower communication path that communicates 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 cylinder, A valve device that is interposed between the side communication passage and the upper communication passage, and the communication is interrupted, and the fluid stored in the front wheel side cylinder and the rear wheel side cylinder is maintained at a predetermined pressure via the valve device. In the stabilizer control device including the accumulator, 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, A first urging means for urging the spool valve in the second pressure chamber direction; and a second urging means for urging the spool valve in the first pressure chamber direction, Upper communication path The first pressure chamber is connected to the first pressure chamber and the lower communication path is connected to the second pressure chamber so that the pressure in the first pressure chamber is equal to the pressure in the second pressure chamber. Sometimes the upper communication passage and the lower communication passage are connected to the accumulator via the spool valve, and when the pressure in the first pressure chamber and the pressure in the second pressure chamber are different, the spool valve There has been proposed a device that is configured to block communication between the upper communication path, the lower communication path, and the accumulator.

Japanese Patent No. 4438693 JP 2009-274597 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, in the device described in Patent Document 1, two control valves are required, and in the device described in Patent Document 2, a spool having a complicated flow path is required, and any of the valve devices is complicated and expensive. It has become a thing.

  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 an inexpensive valve device.

  To achieve the above object, the present invention provides a front wheel side stabilizer bar that supports both ends of a vehicle front wheel and a vehicle body, and a first piston that supports one end on the left and right sides of the front wheel side stabilizer bar. And a front wheel side cylinder having a first housing that supports the vehicle body by forming a pressure chamber on the upper side of the vehicle and a pressure chamber on the lower side of the vehicle through the first piston, and supports both ends on the wheel on the rear side of the vehicle. And a rear wheel side stabilizer bar supported on the vehicle body, a second piston supporting one end on the left and right sides of the rear wheel side stabilizer bar, and a pressure chamber on the vehicle upper side via the second piston, A rear wheel side cylinder having a second housing that forms a pressure chamber on the vehicle lower side and is supported by the vehicle body; a pressure chamber on the vehicle upper side of the front wheel side cylinder; An upper communication path that communicates with a pressure chamber on the side, a lower communication path that communicates and connects a pressure chamber on a vehicle lower side of the front wheel side cylinder and a pressure chamber on a vehicle lower side of the rear wheel side cylinder, A valve device that is interposed between the lower communication passage and the upper communication passage, and that connects and disconnects the communication, and fluid that is stored in the front wheel cylinder and the rear wheel cylinder through the valve device at a predetermined pressure. In the stabilizer control device provided with the accumulator to be maintained, the valve device is a valve housing and a solid columnar valve body movably accommodated in the valve housing, and the moving direction in the valve housing Forming a first pressure chamber and a second pressure chamber on both sides of the valve housing, and forming an annular gap with the inner wall of the valve housing, the first pressure chamber, A second pressure chamber and A valve body in which the accumulator communicates with each other; a first urging means for urging the valve body in the direction of the second pressure chamber; and urging the valve body in the direction of the first pressure chamber. Second urging means configured to connect the upper communication path to the first pressure chamber and to connect the lower communication path to the second pressure chamber, When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber is within a predetermined differential pressure, the first pressure chamber and the second pressure chamber are respectively connected to the upper communication passage and the lower portion. When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber exceeds the predetermined differential pressure, the valve body causes the first pressure chamber and the first communication to communicate with the side communication path. Among the two pressure chambers, the pressure chamber on the low pressure side and the communication on the low pressure side of the upper communication passage and the lower communication passage. It is configured to block communication with the passage.

  In the valve device, a first opening that communicates the upper communication path with the first pressure chamber is formed at one end of the valve housing, and the lower communication path is formed at the other end of the valve housing. When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber exceeds the predetermined differential pressure, the valve is communicated with the second pressure chamber. One end surface of the body may be configured to block one of the first opening and the second opening communicating with the low pressure side pressure chamber of the first pressure chamber and the second pressure chamber. .

  Furthermore, it is preferable that a seal member for closing the first opening and the second opening is attached to both end faces of the valve body. Each of the first urging means and the second urging means can be constituted by a compression spring interposed between the inner wall of the valve housing and the valve body. In particular, stepped portions are formed on both end faces of the valve body, and the compression spring is constituted by a truncated cone-shaped compression spring, the small-diameter side of the truncated cone-shaped compression spring is supported by the stepped portion, and the large-diameter side is supported. It is good to support on the inner wall of the said valve housing.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, in the stabilizer control device configured as described in claim 1, the valve device is movably accommodated in the valve housing, and the first pressure chamber and the second pressure device are disposed on both sides of the valve housing in the moving direction. And a valve body in which an annular gap is formed between the inner wall of the valve housing and the first pressure chamber, the second pressure chamber, and the accumulator communicate with each other through the annular gap. A first urging means for urging the valve body in the direction of the second pressure chamber; and a second urging means for urging the valve body in the direction of the first pressure chamber. The side communication passage is connected to the first pressure chamber and the lower communication passage is connected to the second pressure chamber, and the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber is established. When the pressure is within a predetermined differential pressure, the first pressure chamber and the second pressure chamber are on the upper side, respectively. When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber exceeds a predetermined differential pressure, the first pressure chamber and the second pressure are communicated by the valve body. The low pressure side pressure chamber of the chamber and the upper side communication path and the lower side communication path are configured to block communication with the low pressure side communication path, and the valve device having such a simple and inexpensive structure is used. The rolling motion can be suppressed while reliably suppressing the influence of the thermal expansion of the fluid accommodated in each cylinder.

  In particular, when the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber exceeds a predetermined differential pressure, the one end surface of the valve body is a low pressure of the first pressure chamber and the second pressure chamber. If one of the first opening and the second opening communicating with the pressure chamber on the side is closed, the communication with the upper communication path or the lower communication path can be easily blocked. Furthermore, if sealing members that close the first opening and the second opening are mounted on both end faces of the valve body, the communication with the upper communication path or the lower communication path can be reliably blocked. Can do. The first urging means and the second urging means can each be constituted by a compression spring interposed between the inner wall of the valve housing and the valve body, and stepped portions on both end faces of the valve body. If the small-diameter side of the frustoconical compression spring is supported by the step portion and the large-diameter side is supported by the inner wall of the valve housing, the valve body can be properly held and smooth operation can be ensured. Can do.

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 operating state of the valve apparatus in one Embodiment of this invention. It is sectional drawing which shows the other aspect of the valve apparatus in one Embodiment of this invention. It is a perspective view showing the whole composition of the stabilizer control device concerning one embodiment of the present invention.

  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. The front wheel side cylinder FC is connected to the front wheel side stabilizer bar FS (the mount FM1 in FIG. 4). Via a first piston P1 supporting one end and a pressure chamber U1 on the vehicle upper side and a pressure chamber L1 on the vehicle lower side via the first piston P1 and supporting the pressure chamber L1 on the vehicle body (not shown). A first housing H1 is provided. Similarly, the rear wheel side cylinder RC has a second piston P2 that supports one end on the rear wheel side stabilizer bar RS (via the mount RM1 in FIG. 4) 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, the valve device MV of the present embodiment includes a single solid columnar valve body 2 that is movably accommodated in a valve housing 1. A first pressure chamber C1 and a second pressure chamber C2 are formed, and an annular gap CL is formed between the inner wall of the valve housing 1, and the first pressure chamber C1 and the second pressure chamber C2 are formed through the gap CL. The pressure chamber C2 and the accumulator Acc communicate with each other. In the first pressure chamber C1 and the second pressure chamber C2, a compression spring B1 and a valve body 2 are provided as first urging means for urging the valve body 2 in the direction of the second pressure chamber C2, respectively. On the other hand, a compression spring B2 is accommodated as a second urging means for urging in the direction of the first pressure chamber C1, and the upper communication path UP is connected to the first pressure chamber C1, and the lower side The communication path LP is connected to the second pressure chamber C2. Accordingly, as shown in FIG. 1, a first opening O <b> 1 that connects the upper communication path UP to the first pressure chamber C <b> 1 is formed at one end of the valve housing 1. Is formed with a second opening O2 that communicates the lower communication path LP with the second pressure chamber C2.

  As shown in FIG. 1, the valve body 2 has a stepped portion in which columnar protrusions 2p and 2p are formed to extend from the center of both end surfaces of the columnar body, and thus stepped portions 2s and 2s are formed on both end surfaces. It is a cylinder. The compression springs B1 and B2 are both composed of a truncated cone-shaped compression spring, the smaller diameter side is supported by the step portions 2s and 2s of the valve body 2, and the larger diameter side is supported by the inner wall of the valve housing 1. Even when B1 and B2 are extended, the small diameter side and the large diameter side are maintained in contact with the step portions 2s, 2s and the inner wall of the valve housing 1 (for example, the state of the compression spring B1 in FIG. 2). Thus, the valve body 2 is appropriately held in the valve housing 1 by the compression springs B1 and B2, and the operation of the valve body 2 is caused by the expansion and contraction of the compression springs B1 and B2 accompanying the movement of the valve body 2 in the valve housing 1. The smooth operation of the valve body 2 is ensured without being damaged.

  When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber is within a predetermined differential pressure (for example, Pd), the first pressure chamber C1 and the second pressure chamber C2 are respectively connected to the upper communication path UP. When the difference between the pressure in the first pressure chamber C1 and the pressure in the second pressure chamber C2 exceeds a predetermined differential pressure (Pd), the protrusion of the valve body 2 communicates with the lower communication passage LP. The tip end surface of 2p is in contact with the first opening O1 or the second opening O2, and the low pressure side pressure chamber of the first pressure chamber C1 and the second pressure chamber C2, the upper side communication path UP, and the lower side communication. The passage LP is configured to be disconnected from the low-pressure side communication passage. That is, the set height (axial length) and set load of the compression springs B1 and B2 are set so that a predetermined differential pressure (Pd) is generated at the neutral position of the valve body 2 shown in FIG.

  The operation of the stabilizer control device having the above configuration will be described. In the state shown in FIG. 1 when the valve body 2 is in the neutral position, an annular gap CL between the inner wall of the valve housing 1 and the valve body 2 is set. The first pressure chamber C1, the second pressure chamber C2, and the accumulator Acc are in communication with each other. That is, 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 are in communication with each other and pressurized to a predetermined pressure. Filled with fluid. Thus, the pressure in the pressure chamber U1 and the pressure chamber U2 on the upper side of the vehicle, that is, the pressure (referred to as pu) in the first pressure chamber C1, and the pressure in the pressure chamber L1 and the pressure chamber L2 on the lower side of the vehicle. That is, when the difference from the pressure (referred to as pl) in the second pressure chamber C2 is within a predetermined differential pressure (Pd), the state is shown in FIG. 1, and the first pressure chamber C1 and the second pressure chamber C2 The pressure chamber C2 communicates with the upper communication path UP and the lower communication path LP, respectively.

  From the state shown in FIG. 1, for example, the pressure in the pressure chamber U1 and the pressure chamber U2 on the vehicle upper side becomes the high pressure side, and the difference between the pressure in the first pressure chamber C1 and the pressure in the second pressure chamber C2 is When the relation [(pu−pl)> pd] is greater than the predetermined differential pressure (Pd), the low-pressure compression spring B2 is compressed into the state shown in FIG. 2p, the second opening O2 is closed, and the upper communication path UP (pressure chamber U1 and pressure chamber U2) and the accumulator Acc communicate with the lower communication path LP (pressure chamber L1 and pressure chamber L2). Is cut off. 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 [(pl-pu)> pd] is satisfied, one end surface of the valve element 2 (the left protrusion in FIG. 2) 2p, the first opening O1 is closed, and 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 communicate with each other. Is cut off.

  Thus, when the vehicle turns, the pressure in the first pressure chamber C1 and the pressure in the second pressure chamber C2 are different, and the upper communication passage UP, the lower communication passage LP, and Since the mutual communication of the accumulators Acc is blocked and fluid movement does not occur 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 have their respective stabilizer functions. Demonstrating and suppressing the rolling motion of the vehicle body.

  On the other hand, when the vehicle (not shown) is running straight and moves up and down substantially parallel to the road surface, the state shown in FIG. The upper communication path UP, the lower communication path LP, and the accumulator Acc communicate with each other via an annular gap CL between them, and the fluid can move freely, and the thermal expansion and contraction of the fluid is caused by the accumulator Acc. Is absorbed properly. 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.

  In order to further secure the closed state of the first opening O1 or the second opening O2 by the end face of the valve body 2, as shown in FIG. It is good also as attaching to (tip surface of protrusion 2p, 2p). Furthermore, if the annular groove 2g is formed in the movement range of the valve body 2 opposite to the opening communicating with the accumulator Acc on the side surface of the valve body 2, the valve housing 1 can be used without concern about the processing accuracy of the opening. Can be easily manufactured.

FS Front wheel side stabilizer bar RS Rear wheel side stabilizer bar FC Front wheel side cylinder RC Rear wheel side cylinder UP Upper side communication path LP Lower side communication path Acc Accumulator C1 First pressure chamber C2 Second pressure chamber B1 Compression spring (first Energizing means)
B2 compression spring (second biasing means)
MV valve device 1 valve housing 2 valve body 3 seal member

Claims (5)

  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 A stabilizer control device comprising: a valve device that is interposed between the valves and that connects and disconnects communication; and an accumulator that maintains fluid stored in the front wheel side cylinder and the rear wheel side cylinder at a predetermined pressure via the valve device. The valve device is a valve housing and a solid columnar valve body that is movably accommodated in the valve housing, and includes a first pressure chamber and a second pressure valve on both sides of the valve housing in the moving direction. In addition to forming a pressure chamber, an annular gap is formed with the inner wall of the valve housing, and the first pressure chamber, the second pressure chamber, and the accumulator communicate with each other through the annular gap. Valve And a first urging means for urging the valve body in the direction of the second pressure chamber, and a second urging means for urging the valve body in the direction of the first pressure chamber. The upper communication path is connected to the first pressure chamber, and the lower communication path is connected to the second pressure chamber, and the pressure in the first pressure chamber is When the difference from the pressure in the second pressure chamber is within a predetermined differential pressure, the first pressure chamber and the second pressure chamber communicate with the upper communication passage and the lower communication passage, respectively. When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber exceeds the predetermined differential pressure, the valve element causes a pressure on the low pressure side of the first pressure chamber and the second pressure chamber. The pressure chamber is configured to block communication between the upper-side communication path and the lower-side communication path with the low-pressure side communication path. The stabilizer control apparatus characterized by the above-mentioned.   In the valve device, a first opening that communicates the upper communication path with the first pressure chamber is formed at one end of the valve housing, and the lower communication path is formed at the other end of the valve housing. When the difference between the pressure in the first pressure chamber and the pressure in the second pressure chamber exceeds the predetermined differential pressure, the valve is communicated with the second pressure chamber. One end surface of the body is configured to block one of the first opening and the second opening communicating with the pressure chamber on the low pressure side of the first pressure chamber and the second pressure chamber. The stabilizer control device according to claim 1.   The stabilizer control device according to claim 2, wherein a seal member that closes the first opening and the second opening is attached to both end faces of the valve body.   4. The first urging means and the second urging means are each constituted by a compression spring interposed between an inner wall of the valve housing and the valve body. The stabilizer control apparatus as described in any one of these.   Steps are formed on both end faces of the valve body, the compression spring is constituted by a truncated cone-shaped compression spring, a small-diameter side of the truncated cone-shaped compression spring is supported by the stepped portion, and a large-diameter side is supported by the valve The stabilizer control device according to claim 4, wherein the stabilizer control device is supported on an inner wall of the housing.

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