CN118043242A - Pedal simulator - Google Patents

Abstract

The invention relates to a pedal simulator, comprising: a cylinder body having one side opened and the other side closed to form an inner space; a piston that moves forward and backward in conjunction with the operation of the pedal in the inner space of the cylinder; a damper disposed in an inner space of the cylinder to transmit a pedal feel to the electric booster by pressure applied by the piston; a push rod having one side connected to the pedal and the other side connected to the piston, and moving the piston forward toward the damper in conjunction with the operation of the pedal; and a return device provided to surround one side of the cylinder and a portion of the push rod, and to provide a return force to move the push rod moving forward backward.

Description

Pedal simulator

Technical Field

The present invention relates to a pedal simulator, and more particularly, to a pedal simulator that transmits a pedal operation of a driver to an electronic control system and provides a reaction force to the driver.

Background

Vehicles are basically equipped with a brake system for performing braking, and various modes of brake systems are proposed for safety of drivers and passengers.

The conventional brake system mainly adopts a manner of supplying hydraulic pressure required for braking to wheel cylinders by using a mechanically connected booster when a driver depresses a brake pedal.

However, as the market demand for various braking functions capable of closely responding to the operating environment of a vehicle has increased, in recent years, an electronic brake system configured to receive a braking intention of a driver as an electric signal from a pedal displacement sensor that senses a displacement of a pedal when the driver depresses the brake pedal, and operate a hydraulic pressure supply device based on the electric signal to supply hydraulic pressure required for braking to wheel cylinders has been widely used.

The electric brake system is provided with a simulator for forming a brake feel inside the electric booster. The simulator generates a brake feel by pressure generated by operating the master cylinder by a force transmitted when the driver depresses the brake pedal.

However, since the conventional simulator as described above is provided inside the electric booster, it is inevitably necessary to change the shape of the electric booster when it is desired to change the braking feel, but since the electric booster is bulky, the configuration of the engine room is limited, and the firewall inside the vehicle is also required to have a great rigidity due to the weight of the electric booster. As described above, there are many limitations in changing the brake feel of the simulator.

Disclosure of Invention

First, the technical problem to be solved

The present invention is directed to providing a pedal simulator which is separated from an electric control system, can improve the degree of freedom of installation, prevent the occurrence of impact and noise, and can transmit a pedal operation of a driver to the electric control system and provide a reaction force to the driver.

(II) technical scheme

According to an embodiment of the present invention, there is provided a pedal simulator including: a cylinder body having one side opened and the other side closed to form an inner space; a piston that moves forward and backward in conjunction with the operation of the pedal in the inner space of the cylinder; a damper disposed in an inner space of the cylinder to transmit a pedal feel to the electric booster by pressure applied by the piston; a push rod having one side connected to the pedal and the other side connected to the piston, and moving the piston forward toward the damper in conjunction with the operation of the pedal; and a return device provided to surround one side of the cylinder and a portion of the push rod, and to provide a return force to move the push rod moving forward backward.

In addition, the reset device includes: a first elastic member surrounding the push rod and connected to one side of the cylinder, and moving the push rod backward by an elastic force; a sheath surrounding the first elastic member and coupled to one side of the cylinder, and contracting and expanding according to forward and backward movements of the piston; and a holder coupled to one side of the sheath to close one side of the sheath, and the push rod penetrates the holder.

In addition, one or more vent holes are formed in the holder, the vent holes communicating the inside and the outside of the sheath, such that air inside the sheath is exhausted through the vent holes or air outside flows into the inside of the sheath through the vent holes.

The cylinder may further include wing portions extending from an outer peripheral surface of the cylinder in a direction intersecting a longitudinal direction of the cylinder, and the wing portions may be formed symmetrically with respect to a central axis extending in the longitudinal direction of the cylinder.

In addition, a through hole is formed in the wing portion in a direction parallel to a length direction of the cylinder.

In addition, a fastening member that is inserted through the through hole and fixes the cylinder to the vehicle is further included.

In addition, the fastening member includes: a head part, a part of which is inserted into the through hole; and an insertion fixing portion formed to extend from one face of the head portion and inserted into the vehicle to fix the cylinder.

In addition, a ventilation means is further included, which is provided so that air flows according to a change in volume of the inner space of the cylinder and the sheath when the piston moves forward and backward.

In addition, the breather device includes a breather flow path formed in either one of the cylinder and the piston.

The ventilation flow passage is formed in an inner peripheral surface of the cylinder body, and is formed in a slit shape recessed by a predetermined length from a position spaced apart from one side of the cylinder body to the other side of the cylinder body by a predetermined distance.

According to another embodiment of the present invention, there is provided a pedal simulator including: a cylinder body having a hole portion penetrating in a longitudinal direction; a piston inserted into one side of the hole portion of the cylinder and moving forward and backward in conjunction with the operation of the pedal; a cover member inserted into the other side of the hole portion of the cylinder to close the other side of the cylinder; a damper coupled to the cover member and disposed in the hole portion of the cylinder body, the damper transmitting a pedal feel to the electric booster by pressure applied by the piston; a push rod having one side connected to the pedal and the other side connected to the piston, and moving the piston forward toward the damper in conjunction with the operation of the pedal; and a return device provided to surround one side of the cylinder and a portion of the push rod, and to provide a return force to move the push rod moving forward backward.

In addition, the hole portion includes: a first hole formed to penetrate a predetermined length from one side to the other side in the longitudinal direction of the cylinder; and a second hole formed to penetrate from an end of the first hole to the other side of the cylinder, wherein a cross section of the second hole crossing the longitudinal direction of the cylinder is larger than a cross section of the first hole crossing the longitudinal direction of the cylinder.

In addition, the reset member includes: a first elastic member surrounding the push rod and connected to one side of the cylinder, and moving the push rod backward by an elastic force; a sheath surrounding the first elastic member and coupled to one side of the cylinder, and contracting and expanding according to forward and backward movements of the piston; a holder coupled to one side of the sheath to close one side of the sheath, and through which the push rod penetrates; and a second elastic member surrounding the damper and disposed in the second hole, one side of the second elastic member being connected to the piston, the other side being connected to the cover member, and moving the piston rearward by elastic force.

In addition, a ventilation device is further included, and is provided so that air flows according to a change in volume of the bore portion of the cylinder and the sheath when the piston moves forward and backward.

In addition, the breather device includes a first breather flow path formed in either one of the cylinder and the piston such that air of a hole portion of the cylinder flows into an inside of the jacket through the first breather flow path when the piston moves forward, or air of an inside of the jacket flows into a hole portion of the cylinder through the first breather flow path when the piston moves backward.

In addition, the breather device further includes a second breather passage extending from one side of the cylinder body in a longitudinal direction of the cylinder body and penetrating through an outer circumferential surface of the cylinder body so that air inside the sheath is discharged to the outside or air outside flows into the inside of the sheath when the piston moves forward.

In addition, the breather device further includes a third breather passage penetrating from the hole portion of the cylinder to the outside to form a breather passage such that air of the hole portion of the cylinder is discharged to the outside or air of the outside flows into the hole portion of the cylinder when the piston moves forward.

In addition, the breather device further includes a filter member provided so as to cover the second breather passage and the third breather passage so as to surround an outer peripheral surface of the cylinder, the filter member removing foreign matter in the air.

In addition, a stopper member is further included, which is provided between the piston and the first hole, to absorb an impact generated when the piston moves forward and backward and to prevent noise.

The cylinder may further include wing portions extending from an outer peripheral surface of the cylinder in a direction intersecting a longitudinal direction of the cylinder, and the wing portions may be formed symmetrically with respect to a central axis extending in the longitudinal direction of the cylinder.

In addition, a through hole is formed in the wing portion in a direction parallel to a length direction of the cylinder.

In addition, a fastening member penetrating the through hole and combined with the cylinder block and fixing the cylinder block to the vehicle is further included.

The details of other embodiments are contained in the detailed description and the accompanying drawings.

(III) beneficial effects

The pedal simulator according to the present invention has the following effects.

First, a pedal simulator separate from an electric control system (electric booster) can be realized, so that the degree of freedom of installation in an engine room can be improved.

Second, since the pedal simulator is separated from the electric booster, its size can be freely deformed to cope with various braking sensations.

Third, the ventilation means is provided so that noise generated by the air flow when the pedal simulator is operated can be prevented.

Fourth, a stopper member is provided so that it can absorb shock generated when the pedal simulator is operated and prevent noise.

Drawings

Fig. 1 is a sectional view showing a pedal simulator according to an embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view of a portion of the pedal simulator shown in fig. 1.

Fig. 3 is a cross-sectional view in a direction intersecting the pedal simulator shown in fig. 1.

Fig. 4 is a partial perspective view showing a coupling structure of a portion of the cylinder and the fastening member.

Fig. 5 is a perspective view showing the fastening member.

Fig. 6 is an exploded perspective view of a pedal simulator according to another embodiment of the present invention.

Fig. 7 is a cross-sectional view of the pedal simulator of fig. 6.

Fig. 8 is a partial cross-sectional view of the pedal simulator of fig. 6.

Fig. 9 is a perspective view of the stop member.

Fig. 10 and 11 are partial sectional views showing the ventilator.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily implement the embodiments. The present invention may be implemented in a variety of different ways and is not limited to the embodiments described herein.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and proportions of parts of the drawings have been exaggerated or reduced in size, and any dimensions are merely illustrative and not restrictive in character, for the sake of clarity and convenience in the drawings. For the same structure, element, or component shown in more than two drawings, the same reference numerals are used to indicate similar features.

The embodiments of the present invention describe in detail the ideal embodiments of the present invention. Accordingly, various changes to the drawings are contemplated. Thus, embodiments are not limited to the particular morphology of the regions illustrated in the figures, but also include variations in morphology, for example, due to manufacturing.

Hereinafter, the pedal simulator according to the present invention will be described in detail with reference to fig. 1 to 5.

The pedal simulator 100 according to an embodiment of the present invention includes a cylinder 110, a piston 120, a damper 130, a push rod 140, a return device 150, and a breather 160.

The cylinder 110 is formed with an inner space 111. As shown in fig. 1, in the present embodiment, the cylinder 110 is formed in a form in which one side thereof is opened and the other side thereof is closed.

The cylinder 110 includes a wing 113. The wing 113 is used to mount the pedal simulator 100 in a vehicle. The wing 113 is formed to protrude from the outer circumferential surface of the cylinder 110. The wing 113 is formed to extend in a direction crossing the longitudinal direction of the cylinder 110. The wing parts 113 are symmetrically formed in a pair with respect to a central axis parallel to the longitudinal direction of the cylinder block 110.

The wing 113 may be formed in a plate shape having a predetermined thickness, and the shape of the wing 113 is not limited and may be formed in various shapes. A through hole 113a is formed in the wing 113, and the through hole 113a penetrates in a thickness direction parallel to a length direction of the cylinder 110. The fastening member 170 is coupled to the through hole 113a. The fastening member 170 will be described later.

The inner space 111 is formed of a groove (not shown) recessed from one side of the cylinder 110 to the other side by a predetermined length. In this embodiment, the grooves (not marked) are uniformly formed in cross section intersecting the longitudinal direction of the cylinder.

A damper coupling groove (not shown) is formed at an inner surface of the groove (not shown) and is recessed toward the other side of the cylinder 110 so that the damper 130, which will be described later, can be coupled thereto.

The piston 120 is disposed in the inner space 111 of the cylinder 110. Specifically, the piston 120 is provided to be movable forward and backward in the inner space 111 of the cylinder 110.

The piston 120 does not move forward and backward by itself. The piston 120 is moved forward by the push rod 140 and moved backward by the reset device 150.

When the piston 120 moves forward, the other side of the piston 120 contacts the damper 130. A damper coupling groove (not shown) having the same shape as the damper 130 is formed at the other side of the piston 120. Accordingly, when the piston 120 moves forward, one side of the damper 130 is inserted into the damper coupling groove (not labeled).

The push rod 140 is connected to a pedal (not shown) on one side and to the piston 120 on the other side. The push rod 140 is interlocked with the operation of the pedal (not shown). When a driver depresses a pedal (not shown) to apply pressure, the push rod 140 moves (is pushed) forward, and the piston 120 moves forward in conjunction therewith.

The damper 130 is disposed in the inner space 111 of the cylinder 110. The damper 130 transmits a pedal feel to an electric booster (not shown) by pressure applied by the piston 120.

As described above, when the piston 120 moves forward, the piston 120 contacts the damper 130 and applies pressure to the damper 130. Further, the damper 130 transmits a pedal feel to an electric booster (not shown) by an applied pressure. A pressure sensor (not shown) is provided in the electronic brake (not shown), and the pressure sensor (not shown) measures the pressure applied to the damper 130.

In addition, whether the damper 130 is broken or damaged may be determined by measuring a value of the pressure applied to the damper 130 by the pressure sensor (not shown). For example, a pressure greater than or equal to a predetermined value should be measured at the damper 130, and if the pressure is not measured, it may be determined that the damper 130 is broken or damaged.

On the other hand, although not shown in the drawings, a force (force) sensor may be provided at the damper 130. The force sensor (not shown) may directly measure the pressure applied to the damper 130, so that it may be confirmed whether the damper 130 is damaged.

The piston 120, which moves forward, is reset to an initial position by the reset means 150. The reset means 150 is provided to surround one side of the cylinder 110 and a portion of the push rod 140 connected to one side of the piston 120.

The restoring means 150 includes a first elastic member 151, a sheath 152, and a holder 153. One side of the first elastic member 151 is coupled and coupled to an outer circumferential surface of one side of the cylinder 110. The push rod 140 penetrates the first elastic member 151 and is coupled to the piston 120. Accordingly, the first elastic member 151 is provided in a state of surrounding the push rod 140.

In the present embodiment, the first elastic member 151 may be a spring, but is not limited thereto. When the push rod 140 moves forward under the pressure applied by the pedal (not shown), the first elastic member 151 is compressed. When the pressing force applied by the pedal (not shown) is removed, the first elastic member 151 generates a pulling force to return to an original state, so that the push rod 140 is moved rearward. In addition, the piston 120 connected to the push rod 140 also moves rearward.

The sheath 152 is disposed to surround the first elastic member 151. One side of the jacket 152 is also coupled to one side of the cylinder 110. The sheath 152 is formed in a bellows shape such that the sheath 152 is folded when the first elastic member 151 is compressed, and the sheath 152 is unfolded when the first elastic member 151 is stretched.

The holder 153 is coupled to the other side of the sheath 152. The holder 153 closes the other side of the sheath 152 and is fixedly provided to the push rod 140. A hole (not shown) is formed in the holder 153 so that the push rod 140 penetrates the holder 153. Since the holder 153 is fixed to the push rod 140, the sheath 152 may be folded when the push rod 140 moves forward, and the sheath 152 may be unfolded when the push rod 140 moves backward.

A vent hole 153a is formed in the holder 153. The vent 153a communicates the inside and outside of the sheath 152. The air inside the sheath 152 may be discharged to the outside through the vent hole 153a, or the air outside may flow into the inside of the sheath 152 through the vent hole 153a. The vent holes 153a may be formed in plurality at predetermined angles apart in the circumferential direction of the holder 153.

The ventilation means 160 is provided such that air can flow according to the volume change of the inner space 111 of the cylinder 110 and the sheath 152 when the piston 120 moves forward and backward. Specifically, the ventilation device 160 is formed such that air of the inner space 111 of the cylinder 110 moves to the inside of the sheath 152 or air of the inside of the sheath 152 moves to the inner space 111 of the cylinder 110.

Fig. 2 and 3 illustrate one embodiment of the venting device 160.

The breather 160 includes a breather flow channel 161 formed in either one of the cylinder 110 and the piston 120.

The vent flow passage 161 may be formed in the cylinder 110. Specifically, the ventilation flow path 161 is formed in a recessed slot (slot) shape from a position spaced apart from one side of the cylinder 110 to the other side of the cylinder 110 by a predetermined distance (refer to fig. 3).

Other forms of the vent flow passage (not shown) may also be formed in the piston 120. Specifically, the ventilation flow passage may be formed on the outer circumferential surface of the piston 120, and may be formed in a recessed slot (slot) form from one side of the piston 120 to the other side.

After the piston 120 is inserted into the cylinder 110, the volume of the inner space 111 of the cylinder 110 is reduced when the piston 120 moves forward. Accordingly, the air staying in the inner space 111 of the cylinder 110 flows to the inside of the sheath 152 through the ventilation flow passage 161. Conversely, as the piston 120 moves rearward, the volume of the sheath 152 decreases. Accordingly, the air staying inside the jacket 152 flows into the inner space 111 of the cylinder 110 through the ventilation flow passage 161.

When the piston 120 moves forward and backward, the breather 160 causes the inside space 111 of the cylinder 110 and the inside of the sheath 152 to form an appropriate pressure, thereby preventing the sheath 152 from being irregularly folded and preventing a delay in the return of the piston 120. That is, when the piston 120 moves forward and backward, the ventilation device 160 may smooth the air flow in the inner space of the cylinder 110 and the inside of the sheathing 152, so that the generation of noise may be prevented.

The pedal simulator 100 is mounted to a vehicle (not shown) through the fastening member 170. As described above, the fastening member 170 is inserted through the through hole 113a formed in the wing 113. When the pedal simulator 100 is to be mounted on the vehicle (not shown), the cylinder block 110 may be fixed to the vehicle (not shown) so as to mount the pedal simulator 100 on the vehicle (not shown) as long as the fastening member 170 is inserted into the vehicle (not shown).

On the other hand, the cylinder 110 is manufactured by Insert injection molding in a state of including the fastening member 170.

In this embodiment, the cylinder 110 is made of a plastic material. The conventional cylinder is made of a metal material such as aluminum or steel and the fastening members are coupled in a press-fit manner. However, in the present embodiment, as described above, the cylinder is made of a plastic material, and thus the wing 113 may be damaged during the press-in coupling of the fastening member 170. Accordingly, the cylinder block 110 is manufactured by insert injection molding in a state where the fastening member 170 is included, to ensure quality and durability of the cylinder block 110.

The fastening member 170 includes a head 171 and an insertion fixing portion 172. The head 171 is a portion inserted into the through hole 113a of the wing 113. A protrusion 171a is formed on the outer peripheral surface of the head 171. The protrusions 171a are continuously formed in the circumferential direction of the head 171. The protrusion 171a reduces the contact area between the fastening member 170 and the wing 113.

The insertion fixing portion 172 is formed to extend from one surface of the head 171. The insertion fixing portion 172 is a portion inserted into the vehicle (not shown), and the cylinder 110 is fixed by the insertion fixing portion 172. On the other hand, a step a (see fig. 4) is formed at a predetermined distance between a surface of the head 171 and a surface of the wing 113, which form the insertion fixing portion 172.

When the pedal simulator 100 is mounted on the vehicle (not shown), if the wing 113 is in direct contact with the vehicle (not shown), a load generated during the mounting is transmitted to the wing 113, so that the wing 113 may be damaged.

However, by having the step a as described above, it is possible to prevent the wing 113 from being in direct contact with the vehicle (not shown), and to prevent a load generated during installation from being transmitted to the wing 113. In addition, as described above, by forming the protrusion 171a at the head 171, the contact area between the head 171 and the wing 113 can be reduced, and thus friction and load transmission between the fastening member 170 and the wing 113 can be reduced.

Fig. 6 to 11 are pedal simulators 100' according to another embodiment of the present invention.

The pedal simulator 100' differs somewhat from the pedal simulator 100 according to one of the embodiments described above. Therefore, in the following description, only the differences will be described, and the description of the common portions will be omitted.

The pedal simulator 100' includes a cylinder 110', a piston 120', a damper 130, a push rod 140, a return device 150', and a breather 160'.

The cylinder block 110 'includes a hole 111' penetrating in the longitudinal direction. The hole portion 111' includes: a first hole 111a 'formed to penetrate from one side to the other side of the cylinder 110'; and a second hole 111b ' formed to penetrate from the first hole 111a ' to the other side of the cylinder 110 '.

The cross section of the first hole 111a 'crossing the longitudinal direction of the cylinder 110' has a smaller size than the cross section of the second hole 111b 'crossing the longitudinal direction of the cylinder 110'. Therefore, there is a step b due to a difference in size of the cross section of the first hole 111a 'and the second hole 111 b'.

The first hole 111a 'is a portion into which the piston 120' is inserted and coupled. The damper 130 is provided in the second hole 111 b'. Specifically, the damper 130 is coupled to the cover member 180 'inserted into the cylinder member 110'.

In the present embodiment, the other side of the cylinder 110 'is opened through the second hole 111 b'. Accordingly, the pedal simulator 100' further includes the cover member 180' to close the other side of the cylinder 110 '.

The cover member 180' is inserted into the inside of the second hole 111b ' from the other side of the cylinder 110 '. A groove 181 'is formed at one side of the cover member 180', and the damper 130 is disposed in the second hole 111b 'in a state that the other side thereof is inserted into the groove 181'.

A stepped recess 112' is formed in the second hole 111b ' at a predetermined position from the other side to one side of the cylinder 110 '. The cover member 180 'is positioned by being caught by the stepped recess 112'. W between the cover member 180' and the stepped recess 112' is welded (welding) to fix the cover member 180'.

As in the above-described one embodiment, a wing 113 is also formed in the cylinder 110', and a fastening member 170 is coupled to the wing 130. Since this is the same as the above-described one embodiment, a detailed description will be omitted.

On the other hand, a snap ring 182 'is coupled to the other side of the cylinder 110' to prevent the cover member 180 'from being separated from the other side of the cylinder 110'.

The piston 120' is inserted into the first hole 111' of the cylinder 110', and a portion of the other side of the piston 120' is located inside the second hole 111b '. The piston 120 'is formed with a flange portion 121' at a position spaced apart from the other side of the piston 120 'to one side of the piston 120' by a predetermined distance, the flange portion 121 'protruding from the outer circumferential surface of the piston 120' and extending in the circumferential direction.

When the piston 120' is inserted into the interior of the cylinder 110', the flange portion 121' is caught by the step b. Thus, the piston 120 'is prevented from being separated from the cylinder 110'.

The pedal simulator 100 'further includes a stop member 190'. The stopper member 190 'is disposed between the flange portion 121' and the step b. The stopper member 190' is made of a material having elasticity to absorb an impact generated due to contact with the step b of the cylinder 110' when the piston 120' is restored after being moved forward and to reduce noise.

Fig. 9 shows the stop member 190'. Referring to fig. 9, the stopper member 190' is formed in a ring shape. One side 191 'of the stopper member 190' faces the step b, and the other side 192 'faces the flange 121'. A protrusion 193 'is formed on the one face 191'. Accordingly, the protrusion 193' contacts the step b.

The protrusions 193' are formed in plurality at predetermined angles apart from each other on the one surface 191' in the circumferential direction of the stopper member 190 '. By forming the protrusion 193 'on the stopper member 190', it is possible to reduce a contact area with the step b and reduce noise generated when the piston 120 is separated from the step b when it moves forward.

Grooves 194' are formed on both sides of the one surface 191' with respect to the protrusions 193 '. The groove 194 'serves as an avoidance space in which a portion where the protrusion 193' is formed can be easily deformed, so that the piston 120 is brought into contact with the protrusion 193 'before being abutted against the one face 191'. Like the protrusion 193', the grooves 194' are formed in the other face 192 'at predetermined angles apart in the circumferential direction of the stopper member 190'.

The restoring means 150 'includes a first elastic member 151, a sheath 152, a holder 153, and a second elastic member 154'. Since the first elastic member 151, the sheath 152, and the holder 153 are the same as those of the above-described one embodiment, a detailed description will be omitted.

The second elastic member 154 'is disposed in the cylinder 110'. Specifically, the second elastic member 154 'is disposed in the second hole 111 b'. The second elastic member 154' is connected to the piston 120' at one side and connected to the cover member 180' at the other side and is disposed in a state of surrounding the damper 130. As with the first elastic member 151, the second elastic member 154' may be a spring.

When the piston 120 'moves forward by the operation of the pedal (not shown), the second elastic member 154' is compressed. When the force to move the piston 120' forward is removed, the second elastic member 154' generates a pulling force to move the piston 120' rearward and return to the initial position.

The return means 150' further includes the second elastic member 154' to provide a force to return the piston 120' when the first elastic member 151 is damaged.

The ventilation means 160 'is provided so that air can flow according to the volume change of the hole portion 111' of the cylinder 110 'and the sheath 152 when the piston 120' moves forward and backward.

The venting device 160 'includes a first vent channel 161', a second vent channel 162', and a third vent channel 163'. The first vent flow path 161' is formed in the first hole 111a ' of the cylinder 110' as in the above-described one embodiment.

When the piston 120 'moves forward, air inside the second hole 111b' of the cylinder 110 'flows into the inside of the sheath 152 through the first ventilation flow path 161'. When the piston 120 'moves backward, air inside the sheath 152 flows into the second hole 111b' of the cylinder 110 'through the first ventilation flow path 161'.

The first ventilation flow path 161 'may be formed on the outer circumferential surface of the piston 120'.

The second ventilation flow path 162 'is formed such that air inside the sheath 152 is discharged to the outside when the piston 120' moves forward, or air outside flows into the sheath 152. The second ventilation flow path 162' is formed from one side of the cylinder 110' connected to the jacket 152 to the outer circumferential surface of the cylinder 11 '.

Fig. 10 shows a detailed structure of the second ventilation flow path 162'. Referring to fig. 10, the second ventilation flow path 162' includes: a first flow path 162a ' extending from one side of the cylinder 110' connected to the jacket 152 in a longitudinal direction of the cylinder 110 '; and a second flow passage 162b 'extending from an end of the first flow passage 162a' in a direction intersecting the first flow passage 162a 'and toward an outer circumferential surface of the cylinder 110'.

Accordingly, the air staying inside the sheath 152 flows along the second ventilation flow path 162' and is discharged to the outside. In addition, the outside air flows into the inside of the sheath 152 through the second ventilation flow path 162'.

The venting device 160 'further includes a filter member 164'. The filter member 164 'is disposed so as to surround the outer circumferential surface of the cylinder 110', and referring to fig. 10, the filter member 164 'is disposed so as to cover the second ventilation flow path 162'. Accordingly, the air flowing into the second ventilation flow path 162 'from the outside passes through the filtering member 164', so that foreign substances in the air can be filtered out, preventing the foreign substances from flowing into the inside of the sheath 152.

The third ventilation flow channel 163 'is formed to be spaced apart from the first ventilation flow channel 162'. The third air flow passage 163 'is formed such that air inside the second hole 111b' of the cylinder 110 'is discharged to the outside when the piston 120' moves forward, or the outside air flows into the inside of the second hole 111b 'of the cylinder 110'.

Fig. 11 shows the third vent flow channel 163' in detail. Referring to fig. 11, the third air passage 163 'is formed at a position spaced apart from the other side of the cylinder 110' by a predetermined distance in a direction of one side. The third air passage 163 'is formed to penetrate in a direction crossing the longitudinal direction of the cylinder 110'. Accordingly, the inside and the outside of the cylinder 110 'are communicated through the second hole 111 b'.

The air staying inside the cylinder 110' is discharged to the outside of the cylinder 110' through the third air flow passage 163 '. In contrast, the outside air flows into the inside of the cylinder 110 'through the third vent passage 163'.

The third air passage 163' is covered with the filter member 164' provided around the outer circumferential surface of the cylinder 110 '. That is, the external air passes through the filtering member 164 'to remove foreign matters and then flows into the inside of the cylinder 110'.

The second vent passage 162' and the third vent passage 163' are formed to prevent noise from being generated by the first vent passage 161' not compensating for the volume change of the sheath 152 and the volume change of the second hole 111b ' only when the piston 120' moves forward.

Since the conventional pedal simulator is integrally formed with an electric booster (not shown), the pedal simulator can be connected to the pedal when the electric booster is incorporated into a Firewall (Firewall) in the vehicle. In particular, it has disadvantages in that it is necessary to have a pedal forming a circular track in a downward direction to connect, a space for an engine room needs to be secured, and a plurality of assembling persons (two) are required. Therefore, it is difficult to apply to organ pedals.

The pedal simulator according to the present embodiment is separate from the electric booster, and thus can also be connected to an organ pedal. An organ pedal is a pedal that forms a circular trajectory in the upward direction. The pedal simulators 100, 100 'according to the present embodiment have a degree of freedom of installation, and thus can be disposed and assembled obliquely downward at a predetermined angle with respect to an imaginary horizontal line passing through an axis connecting the organ pedal (not shown) and the pedal simulators 100, 100'.

The organ type pedal (not shown) can be installed by one operator, and thus the assembly condition can be improved.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that the present invention may be embodied in any other specific form without changing the technical spirit or essential features of the present invention.

It is, therefore, to be understood that the above-described embodiments are illustrative in all respects and not restrictive, and that the scope of the invention is to be determined by the appended claims, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (22)

1. A pedal simulator, comprising:

A cylinder body having one side opened and the other side closed to form an inner space;

A piston that moves forward and backward in conjunction with the operation of the pedal in the inner space of the cylinder;

a damper disposed in an inner space of the cylinder to transmit a pedal feel to the electric booster by pressure applied by the piston;

a push rod having one side connected to the pedal and the other side connected to the piston, and moving the piston forward toward the damper in conjunction with the operation of the pedal; and

A return device provided to surround one side of the cylinder and a portion of the push rod, and to provide a return force to move the push rod moving forward backward.

2. The pedal simulator of claim 1, wherein,

The resetting device comprises:

A first elastic member surrounding the push rod and connected to one side of the cylinder, and moving the push rod backward by an elastic force;

A sheath surrounding the first elastic member and coupled to one side of the cylinder, and contracting and expanding according to forward and backward movements of the piston; and

A holder coupled to one side of the sheath to close one side of the sheath, and the push rod penetrates the holder.

3. The pedal simulator according to claim 2, wherein,

More than one vent hole is formed in the holder, the vent hole communicating the inside and the outside of the sheath, such that air inside the sheath is exhausted through the vent hole, or air outside flows into the inside of the sheath through the vent hole.

4. The pedal simulator of claim 1, wherein,

The cylinder further includes a wing portion formed extending from an outer circumferential surface of the cylinder in a direction crossing a longitudinal direction of the cylinder,

The wing parts are symmetrically formed in a pair with respect to a central axis passing through the cylinder body in a longitudinal direction.

5. The pedal simulator of claim 4, wherein,

Through holes are formed in the wing portions in a direction parallel to the length direction of the cylinder block.

6. The pedal simulator of claim 5, further comprising a fastening member,

The fastening member is inserted through the through hole, and fixes the cylinder to the vehicle.

7. The pedal simulator of claim 6, wherein,

The fastening member includes:

a head part, a part of which is inserted into the through hole; and

An insertion fixing portion is formed extending from one face of the head portion and is inserted into the vehicle to fix the cylinder.

8. The pedal simulator of claim 2, further comprising:

And a breather device provided so that air flows according to a change in volume of the inner space of the cylinder and the sheath when the piston moves forward and backward.

9. The pedal simulator of claim 8, wherein,

The breather device includes a breather flow path formed in either one of the cylinder and the piston.

10. The pedal simulator of claim 9, wherein,

The ventilation flow passage is formed on an inner peripheral surface of the cylinder body, and is formed in a slit shape recessed by a predetermined length from a position spaced apart from one side of the cylinder body to the other side of the cylinder body by a predetermined distance.

11. A pedal simulator, comprising:

A cylinder body having a hole portion penetrating in a longitudinal direction;

A piston inserted into one side of the hole portion of the cylinder and moving forward and backward in conjunction with the operation of the pedal;

a cover member inserted into the other side of the hole portion of the cylinder to close the other side of the cylinder;

A damper coupled to the cover member and disposed in the hole portion of the cylinder body, the damper transmitting a pedal feel to the electric booster by pressure applied by the piston;

a push rod having one side connected to the pedal and the other side connected to the piston, and moving the piston forward toward the damper in conjunction with the operation of the pedal; and

A return device provided to surround one side of the cylinder and a portion of the push rod, and to provide a return force to move the push rod moving forward backward.

12. The pedal simulator of claim 11, wherein,

The hole portion includes:

A first hole formed to penetrate a predetermined length from one side to the other side in the longitudinal direction of the cylinder; and

A second hole formed to penetrate from an end of the first hole to the other side of the cylinder body,

The cross section of the second hole crossing the longitudinal direction of the cylinder is larger than the cross section of the first hole crossing the longitudinal direction of the cylinder.

13. The pedal simulator of claim 12, wherein,

The reset member includes:

A first elastic member surrounding the push rod and connected to one side of the cylinder, and moving the push rod backward by an elastic force;

a sheath surrounding the first elastic member and coupled to one side of the cylinder, and contracting and expanding according to forward and backward movements of the piston;

A holder coupled to one side of the sheath to close one side of the sheath, and through which the push rod penetrates; and

And a second elastic member surrounding the damper and disposed in the second hole, one side of the second elastic member being connected to the piston, the other side being connected to the cover member, and moving the piston rearward by elastic force.

14. The pedal simulator of claim 13, further comprising:

And a breather device provided so that air flows according to a change in volume of the bore portion of the cylinder and the sheath when the piston moves forward and backward.

15. The pedal simulator of claim 14, wherein,

The breather device includes a first breather flow path formed in either one of the cylinder and the piston such that air of a hole portion of the cylinder flows into an interior of the jacket through the first breather flow path when the piston moves forward, or air of an interior of the jacket flows into a hole portion of the cylinder through the first breather flow path when the piston moves backward.

16. The pedal simulator of claim 14, wherein,

The breather device further includes a second breather passage extending from one side of the cylinder body in a longitudinal direction of the cylinder body and formed through an outer circumferential surface of the cylinder body such that air inside the jacket is discharged to the outside or air outside flows into the inside of the jacket when the piston moves forward.

17. The pedal simulator of claim 14, wherein,

The breather device further includes a third breather passage formed to penetrate from the hole portion of the cylinder to the outside so that air of the hole portion of the cylinder is discharged to the outside or air of the outside flows into the hole portion of the cylinder when the piston moves forward.

18. The pedal simulator of claim 17, wherein,

The breather device further includes a filter member provided so as to cover the second breather passage and the third breather passage in a manner to surround an outer peripheral surface of the cylinder, the filter member removing foreign matter in the air.

19. The pedal simulator of claim 12, further comprising:

and a stopper member disposed between the piston and the first hole to absorb an impact generated when the piston moves forward and backward and to prevent noise.

20. The pedal simulator of claim 11, wherein,

The cylinder further includes a wing portion formed extending from an outer circumferential surface of the cylinder in a direction crossing a longitudinal direction of the cylinder,

The wing parts are symmetrically formed in a pair with respect to a central axis passing through the cylinder body in a longitudinal direction.

21. The pedal simulator of claim 20, wherein,

Through holes are formed in the wing portions in a direction parallel to the length direction of the cylinder block.

22. The pedal simulator of claim 21, further comprising a fastening member,

The fastening member penetrates the through hole and is coupled with the cylinder block, and fixes the cylinder block to the vehicle.