Floor type parking brake device

Abstract

To eliminate to manually operate an operation knob energized by a spring member installed on a lever body for drift travel of a vehicle for race by providing an additional mechanism for a floor type parking brake device of an ordinary vehicle.SOLUTION: A pole 32 comprising lock teeth 42 capable of meshing with ratchet teeth 44 of a sector 30 is installed rotatably on a lever body 24 of an operation mechanism part 14 of a floor type parking brake device 10. The pole 32 is normally energized by a coil spring 36 to rotate in a direction in which the lock teeth 42 mesh with the ratchet teeth 44. A fixing mechanism 60 (sector-pole meshing state changeover means 54) is installed on a third branch piece 32 of the pole 32, and the lock teeth 42 of the pole 32 are always fixed by a thread-cut bolt 66 at a position apart from the ratchet teeth. Consequently, an operation part 26 can be operated in drift travel of a vehicle for race without operating the operation knob 28.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a floor-type parking brake device, and more particularly to a floor-type parking brake device applicable to both ordinary vehicles such as automobiles and racing vehicles. [Background technology]

[0002] Normal vehicles such as automobiles are equipped with a parking brake device for reliably fixing the vehicle when parking. There are various types of parking brake devices, one of which is a floor-type parking brake device that is installed on the floor of the vehicle. This floor-type parking brake device allows the vehicle to be selected between a parking position and a non-parking position by manually operating a lever body installed on the floor in the up and down direction. Normal vehicles are driven in the non-parking position state.

[0003] Floor-type parking brake devices normally lock the rear wheels of a vehicle, and the operating mechanism for locking the rear wheels is configured as follows (see Patent Document 1 below). First, the vehicle's parking active state and parking inactive state are set by a lever body that is rotatably mounted on a base member fixed to the vehicle floor, with a rotation shaft as its axis. An operating part is set on the lever body at a position separated from the rotation shaft of the lever body, and an operating knob is provided at the operating part, and the aforementioned parking active state and parking inactive state can be switched by operating this operating knob.

[0004] Furthermore, a sector having ratchet teeth formed in an arc shape around the pivot axis of the lever body is disposed on a base member fixed to the floor of the vehicle, while a pole having locking teeth formed thereon that engage with the ratchet teeth of the sector is rotatably disposed on the lever body. The pole is connected to an operation knob provided at an operation portion of the lever body by a link mechanism and is configured so that the ratchet teeth of the sector and the locking teeth of the pole can be brought into meshing condition by the spring force of a spring member biased by the operation knob. The rotational position of the lever body can be switched between a parking operating state and a parking inactive state by manually operating the operation knob.

[0005] In some racing vehicles, the floor-type parking brake device is placed in the parking mode, i.e., the vehicle is drifted with the rear wheels locked. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2021-146973 A Summary of the Invention [Problem to be solved by the invention]

[0007] In a normal vehicle, the position of the lever body in the parking operating state is a position where the lever body is manually pulled upward. In this parking operating state position, the ratchet teeth of the sector are engaged with the locking teeth of the pole, and the lever body is reliably in the parking operating state. Reliably setting this parking operating state position is considered important for the safety of the parking function.

[0008] In a normal vehicle, to put the parking lever into the inoperative state, the lever body must be manually pulled down to the lowered position. To manually put the parking lever into the inoperative state from the parking lever into the inoperative state, the operation knob provided at the operating portion of the lever body must be operated to disengage the ratchet teeth of the sector from the locking teeth of the pole.

[0009] That is, in a normal vehicle, switching between the parking active state and the parking inactive state cannot be performed unless an operating knob provided at an operating portion of the lever body is manually operated.

[0010] In the meantime, as described above, in racing vehicles, so-called drift driving is performed in which the rear wheels of the vehicle are fixed (locked) while driving. When this drift driving is performed using a floor-type parking brake device in a normal vehicle, the lever body is set to the raised position for the parking operating state, and the rear wheels are locked.

[0011] In order to put the rear wheels of a racing vehicle into a normal driving state during drift driving, it is necessary to change the parking operation state from the parking operation state to the parking inoperation state. This operation requires manual operation of the operation knob of the operation portion of the lever body.

[0012] For this reason, in a racing vehicle that requires steering operation as quickly as possible, manual operation of the control knob during drift driving is an obstacle to steering. Therefore, there is a demand for eliminating the need for manual operation of the control knob during drift driving of a racing vehicle.

[0013] The present invention has been devised in consideration of the above-mentioned points, and the problem which the present invention aims to solve is to provide an additional mechanism to a floor-type parking brake device in a normal vehicle, thereby eliminating the need to manually operate an operating knob that is biased by a spring member attached to the lever body when a racing vehicle is drifting. [Means for solving the problem]

[0014] In order to solve the above problems, the floor-type parking brake device according to the present invention takes the following measures.

[0015] A first aspect of the present invention is a floor-type parking brake device, in which a parking operating state and a parking inoperative state are set by the rotation position of a lever body that is rotatably provided on a base member fixed to a vehicle floor with a rotation shaft as the axis, an operation part is provided on the lever body at a position spaced from the rotation shaft of the lever body, and the parking operating state and the parking inoperative state can be switched by operating an operation knob provided on the operation part, a sector having ratchet teeth formed in an arc shape centered on the rotation shaft of the lever body is provided on the base member, and a pole having locking teeth that engage with the ratchet teeth of the sector is provided rotatably on the lever body, the pole is connected to an operation knob provided on the operation part of the lever body by a link mechanism, and the ratchet teeth of the sector and the locking teeth of the pole can be brought into meshing state by the spring force of a spring member biased by the operation knob. This is a floor-type parking brake device in which a sector-to-pole meshing state switching means is provided in one of the connecting components that connect the operating knob of the lever body and the pole, which can select whether the relationship between the ratchet teeth of the sector and the locking teeth of the pole is in an meshable state or in a constantly non-meshing state.

[0016] The second invention of the present invention is a floor-type parking brake device of the first invention described above, wherein the meshing state switching means for the sector and the pole is a fixing mechanism that fixes the relative positional relationship between the pole and the side plate forming the lever body, and the fixing mechanism is a mechanism that can release the fixed state between the two members.

[0017] The third invention of the present invention is a floor-type parking brake device of the second invention described above, wherein the fixing mechanism comprises a simple insertion hole drilled in the pole, a threaded insertion hole drilled in the side plate of the lever body, and a threaded bolt inserted into the threaded insertion hole and the simple insertion hole, and the pole and the side plate of the lever body are fixed by screwing the threaded bolt into the threaded insertion hole.

[0018] The fourth invention of the present invention is a floor-type parking brake device of the second or third invention described above, wherein the setting position of the fixing mechanism is a position spaced away from the engagement position between the locking teeth of the pole and the ratchet teeth of the sector, and further away from the center of rotation of the pole.

[0019] The fifth invention of the present invention is a floor-type parking brake device of the fourth invention described above, wherein the pole forming the fixing mechanism is formed into a Y-shaped three branch pieces, the locking tooth is formed at the tip of the first branch piece, one end of a link mechanism connected to the operating knob is engaged at the tip of the second branch piece, and a screw-formed insertion hole forming the fixing mechanism is formed in the third branch piece. Effect of the Invention

[0020] According to the above-described means of the present invention, by providing an additional mechanism to the floor-type parking brake device of a normal vehicle, it is possible to eliminate the need for manual operation of the operating knob that is biased by a spring member attached to the lever body when a racing vehicle is drifting. [Brief description of the drawings]

[0021] [Figure 1] 1 is an overall configuration diagram showing an embodiment of a floor-type parking brake device according to the present invention. [Diagram 2] 2 is an external view of an operation mechanism section in the floor-type parking brake device shown in FIG. 1. [Diagram 3] FIG. 2 is a layout diagram illustrating an internal mechanism of an operation mechanism section. [Figure 4] This figure shows the operating mechanism of a floor-type parking brake device, illustrating the parking inactive state in which the operating part is in a pulled-down position and the operating knob is not pressed while the locking mechanism is released. [Diagram 5] FIG. 13 is a diagram showing the operation mechanism unit, illustrating a parking operation state in which the operation part is in a raised position, the fixing mechanism is released, and the operation knob is not being pressed. [Figure 6] FIG. 13 is a diagram showing the operation mechanism unit, illustrating a parking inoperative state in which the operation knob is being pressed with the operation portion in a pulled-down position and the locking mechanism released. [Figure 7] FIG. 13 is a diagram showing the operation mechanism unit, illustrating a parking operation state in which the operation part is in a raised position and the operation knob is being pressed with the fixing mechanism released. [Figure 8] FIG. 13 is a diagram showing the operation mechanism unit, illustrating a parking inoperative state in which the fixing mechanism is in a fixed state and the operation part is in a pulled-down position. [Figure 9] FIG. 13 is a diagram showing the operation mechanism unit in a parking operation state in which the fixing mechanism is in a fixed state and the operating part is in a raised position. [Figure 10] 9 is a layout configuration diagram showing an internal mechanism of the operation mechanism section in the state shown in FIG. 8. [Figure 11] 10 is a layout configuration diagram illustrating the internal mechanism of the operation mechanism section in the state shown in FIG. 9. [Figure 12] 10 is a cross-sectional view taken along line XII-XII in FIG. 9, showing the fixed state of the fixing mechanism. [Figure 13] 8 is a cross-sectional view taken along line XIII-XIII in FIG. 7, showing a release state of the fixing mechanism. [Figure 14] 13 is a cross-sectional view showing a first modified example of the fixing mechanism shown in FIG. [Figure 15]FIG. 13 is a diagram showing a second modified example of the fixing mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of a floor-type parking brake device 10 according to the present invention will be described with reference to the drawings. Note that, unless otherwise specified, directional indications such as up and down directions in the description of the drawings refer to the directions in the drawings themselves.

[0023] [Overall layout configuration of floor-type parking brake device 10] FIG. 1 shows the overall configuration of a floor-type parking brake device 10 of this embodiment. The floor-type parking brake device 10 comprises an operation mechanism unit 14 installed on a floor 12 of a vehicle such as an automobile, and a brake mechanism 18 for parking brakes provided on the left and right rear wheels 16 of the vehicle such as an automobile. The brake mechanism 18 is configured to be activated by the operation of the operation mechanism unit 14 by the driver of the automobile or the like. The operation mechanism unit 14 installed on the floor 12 and the brake mechanism 18 provided on the rear wheels 16 are connected by a brake cable 20 routed between the two members 14, 18. The brake mechanism 18 for the parking brakes of the rear wheels 16 is activated to a parking activation state by pulling the brake cable 20 by the operation of the operation mechanism unit 14. Therefore, when the brake cable 20 is not pulled and operated, the brake mechanism 18 for the parking brake is in a state in which the parking activation state is released. This release operation is performed by a return spring (not shown) provided on the brake mechanism 18 for the parking brake.

[0024] Figure 2 shows an external view of the operating mechanism 14 shown in Figure 1. A cam plate 68 is installed on the side of the operating mechanism 14, and a tension cable 70 is attached along the outer surface of the cam plate 68. The tension cable 70 is fixed to the cam plate 68 at an upper position by a fixture 72, and is pulled by operating the operating mechanism 14, transmitting the operation to the brake cable 20 shown in Figure 1 to operate the brake mechanism 18.

[0025] [Overall configuration of operation mechanism unit 14] First, the overall configuration of the operation mechanism 14 will be described with reference to Fig. 1. The operation mechanism 14 includes a base member 22, a lever body 24, an operation portion 26, an operation knob 28, a sector 30, and a pole 32.

[0026] [Base member 22] The base member 22 is formed in a plate shape and is disposed in a state in which it stands on the floor 12 of a vehicle such as an automobile. The base member 22 is fixed to the floor 12 by bolts or the like (not shown).

[0027] [Lever body 24] The lever body 24 is mounted astride the base member 22 with side plates 24A disposed on both sides. The lever body 24 is disposed in a form extending leftward as viewed in FIG. 1 from an upper portion of the base member 22. The lever body 24 is disposed on the base member 22 so as to be rotatable about a rotation shaft 34. As a result, as will be described in detail later, the lever body 24 can take a rotation position in the parking operating state and a rotation position in the parking inactive state about the rotation shaft 34. The state in FIG. 1 is the rotation position in the parking inactive state. The rotation position in the parking operating state is, for example, the position shown in FIG. 5 and FIG. 7.

[0028] [Operation part 26] The operating part 26 is disposed at a position spaced apart from the rotation shaft 34 of the lever body 24. In this embodiment, it is disposed at a position spaced apart to the left of the rotation shaft 34 as viewed in FIG. 1. The operating part 26 and the lever body 24 are integral and rotate together about the rotation shaft 34. The operating part 26 is a part that is held and operated by an operator such as a driver of a vehicle, and is formed in a roughly cylindrical shape for ease of operation. The operator pulls the operating part 26 upward or downward to set the lever body 24 to a rotation position for the parking active state and a rotation position for the parking inactive state.

[0029] [Operation knob 28] The operation knob 28 is disposed by being fitted to the tip of the operation part 26. As seen in FIG. 1, the operation knob 28 is disposed at the left end of the operation part 26 with its tip protruding from the operation part 26. The operation knob 28 serves to rotate a pole 32, which will be described later. The pole 32 and the operation knob 28 are connected by a link mechanism of a link member 40. A coil spring 36 is wound and disposed at the position of the link member 40 inside the operation part 26. The spring force of the coil spring 36 biases the operation knob 28 in the pushing direction, that is, to the left as seen in FIG. 1. The operation knob 28 is usually operated by being pushed by the thumb of the operator holding the operation part 26. Pushing the operation knob 28 allows the lever body 24 to rotate, making it possible to set the position between the parking operating state and the parking inoperating state.

[0030] [Sector 30] 1, the sector 30 is fixed integrally to and disposed above the base member 22. The sector 30 is formed with ratchet teeth 44 with which the locking teeth 42 of the pole 32, which will be described later, engage. The ratchet teeth 44 are formed in an arc shape centered on the rotation axis 34 of the lever body 24. The sector 30 is disposed in a form located between the side plates 24A on both sides of the lever body 24, similar to the base member 22. In other words, the sector 30 is disposed inside the lever body 24.

[0031] [Pole 32] The pole 32 is pivotally supported by a shaft 46 on the side plate 24A of the lever body 24, and is rotatably attached to the lever body 24. Thus, like the sectors 30, the pole 32 is disposed inside the lever body 24 between the side plates 24A on both sides of the lever body 24. The pole 32 and the sectors 30 are disposed in an opposing positional relationship.

[0032] The details of the pole 32 will be described with reference to Fig. 3. Fig. 3 is a diagram in which the left and right sides of Fig. 1 are reversed, and shows the members arranged between the side plates 24A on both sides of the lever body 24. In other words, it shows the internal mechanism of the lever body 24. The pole 32 is formed into a Y-shaped three-branched piece shape. It is formed of a first branched piece 48, a second branched piece 50, and a third branched piece 52. Note that Fig. 3, like Fig. 1, shows the positional relationship of the lever body 24 in the parking inoperative state.

[0033] A locking tooth 42 is formed at the tip of the first branch piece 48, which is adapted to mesh with the ratchet tooth 44 of the sector 30 described above. In this embodiment, the locking tooth 42 is formed of only one tooth. One end of the link member 40 of the link mechanism connected to the operation knob 28 described above is locked to the tip of the second branch piece 50. A simple insertion hole 64 is formed in the third branch piece 52, which forms a fixing mechanism 60 having a configuration that is characteristic of this embodiment, which will be described next.

[0034] When the operating knob 28 is not pressed against the spring force of the coil spring 36, the pawl 32 is rotated clockwise as viewed in Fig. 3 by the spring force of the coil spring 36. As a result, the locking teeth 42 at the tip of the first branch piece 48 of the pawl 32 are normally always engaged with the ratchet teeth 44 of the sector 30.

[0035] [Means for switching the engagement state between the sector and the pole 54 and fixing mechanism 60] Next, a description will be given of the sector and pole meshing state switching means 54, which is a feature of this embodiment. In this embodiment, this meshing state switching means 54 is set as an additional mechanism at the position of the third branch piece 52 of the pole 32 described above.

[0036] The sector and pole meshing state switching means 54 is a means for fixing or releasing the relative positional relationship between the pole 32 and the side plate 24A of the lever body 24, which are set between the two members. In this embodiment, the mechanism for fixing the relative positional relationship is a fixing mechanism 60, which is a mechanism capable of releasing the fixed state between the two members 32 and 24A. Fig. 12 shows the fixed state by the fixing mechanism 60, and Fig. 13 shows the state in which the fixed state has been released. Note that Figs. 12 and 13 are shown enlarged for ease of understanding.

[0037] [Fixed state of the fixing mechanism 60] The fixed state of the fixing mechanism 60 shown in Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 9. The fixing mechanism 60 is composed of a simple through-hole 64 drilled in the pole 32, a threaded through-hole 62 drilled in one side plate 24A of the lever body 24, and a threaded bolt 66 inserted through the threaded through-hole 62 and the simple through-hole 64. As shown in Fig. 12, the fixing mechanism 60 is fixed when the threaded bolt 66 is inserted through the simple through-hole 64 drilled in the pole 32 and screwed into the threaded through-hole 62 drilled in the side plate 24A. In the fixed state of the fixing mechanism 60, the pole 32 and the side plate 24A are integrated with each other in the rotation direction of the pole 32 by the threaded bolt 66, and are fixed.

[0038] 9, the locking teeth 42 of the pawl 32 and the ratchet teeth 44 of the sector 30 are always in a separated position and always in a non-meshing positional relationship. Therefore, the threaded insertion holes 62 drilled in the side plate 24A are drilled at positions where such a state is achieved. This fixed state of the fixing mechanism 60 is used when drifting in a racing vehicle.

[0039] [Released state of the fixing mechanism 60] The release state of the fixing mechanism 60 shown in Fig. 13 is a cross-sectional view taken along line XIII-XIII in Fig. 7. This release state is a state in which the threaded bolt 66 is removed from the simple insertion hole 64 drilled in the pole 32 and the threaded insertion hole 62 in the side plate 24A from the fixed state shown in Fig. 12. Therefore, the pole 32 is allowed to rotate freely with respect to the side plate 24A. Therefore, the locking teeth 42 of the pole 32 and the ratchet teeth 44 of the sector 30 are allowed to mesh with each other, and can be put into a non-meshing state by pushing the operation knob 28. The release state of the fixing mechanism 60 is set for normal parking operations in a vehicle such as an automobile.

[0040] [Setting position of fixing mechanism 60] 3, in this embodiment, the setting position of the fixing mechanism 60 formed on the third branch piece 52 of the pole 32 is a position away from the meshing position of the locking teeth 42 of the pole 32 and the ratchet teeth 44 of the sector 30, and further away from the rotation center of the shaft 46 of the pole 32. This is an arrangement that takes strength into consideration. That is, if the setting position of the fixing mechanism 60 is a position near the meshing position of the locking teeth 42 of the pole 32 and the ratchet teeth 44 of the sector 30, structural strength is required due to the relationship of the meshing strength between the locking teeth 42 and the ratchet teeth 44.

[0041] [Installation of the threaded bolt 66 in the fixing mechanism 60] The threaded bolt 66 in the fixing mechanism 60 is attached with the threaded insertion hole 62 drilled in the side plate 24A of the lever body 24 aligned with the simple insertion hole 64 drilled in the pole 32, as shown in Fig. 12. This alignment is normally performed with the operation knob 28 of the operation part 26 pressed in, since the locking teeth 42 of the pole 32 are in a rotational position away from the ratchet teeth 44 of the sector 30.

[0042] [Parking state detection switch 56] 4 to 9, the floor-type parking brake device 10 generally has a parking state detection switch 56 mounted on the base member 22. When a switch piece 58 formed on the lever body 24 moves away from the parking state detection switch 56, the parking state detection switch 56 is activated, indicating that the parking operation is in progress.

[0043] [Effects of this embodiment] Next, the effects of the above-mentioned embodiment will be described with respect to a parking operation state of a normal vehicle such as an automobile, and a parking operation state of a racing vehicle during drift driving.

[0044] [Parking operation state in normal vehicle] The parking operation state of a normal vehicle such as an automobile is shown in FIG. 4 to FIG. 7. In all of the parking operation states of a normal vehicle such as an automobile shown in FIG. 4 to FIG. 7, the fixing mechanism 60 is released (the state shown in FIG. 13). Therefore, the operation knob 28 provided in the operation part 26 is operable. The state of FIG. 4 shows the operation state in the parking non-operational position state in which the operation part 26 of the operation mechanism part 14 is in a pulled-down position and the operation knob 28 is not pressed. The state of FIG. 5 shows the operation state in the parking operation position state in which the operation part 26 is in a pulled-up position and the operation knob 28 is not pressed. The state of FIG. 6 shows the operation state in the parking non-operational position state in which the operation part 26 is in a pulled-down position and the operation knob 28 is pressed. The state of FIG. 7 shows the operation state in the parking operation position state in which the operation part 26 is in a pulled-up position and the operation knob 28 is pressed.

[0045] In a normal parking operation in a vehicle such as an automobile, the parking operation state is achieved by operating the operation part 26 shown in Fig. 4 or 6 in a pulled-down state to a pulled-up state shown in Fig. 5 or 7. The operation of pulling up the operation part 26 is possible even when the operation knob 28 is being pressed or not being pressed. That is, the engagement between the ratchet teeth 44 of the sector 30 and the locking teeth 42 of the pole 32 is usually in an engagement state in which the locking teeth 42 of the pole 32 can move in the pulling-up direction relative to the ratchet teeth 44 of the sector 30.

[0046] However, the downward movement of the locking teeth 42 of the pole 32 relative to the ratchet teeth 44 of the sector 30 can only be performed by pressing the operation knob 28 to disengage the locking teeth 42 of the pole 32 from the ratchet teeth 44 of the sector 30. In other words, the operation part 26 shown in Fig. 6 cannot be pulled down unless the operation knob 28 is pressed from the state shown in Fig. 5 to the state shown in Fig. 7 to disengage the ratchet teeth 44 of the sector 30 from the locking teeth 42 of the pole 32. Thereafter, the operation knob 28 is released from the state shown in Fig. 4, and the parking inoperative position is set.

[0047] Further, to explain the details of the operation from the state in Fig. 5 to the state shown in Fig. 7, in the state shown in Fig. 5, the meshing state of the locking teeth 42 of the pawl 32 with the ratchet teeth 44 of the sector 30 is such that the operation cannot be performed by simply pushing the operation knob 28. In other words, in the state shown in Fig. 5, the operation knob 28 cannot be pushed unless the operation part 26 is pulled slightly upward from that position to loosen the meshing state between the ratchet teeth 44 and the locking teeth 42.

[0048] This is to prevent the parking operation state from being released even if the operation knob 28 is pressed by mistake. Therefore, the operation to release the parking operation requires a two-step operation of pulling the operation part 26 slightly upward and pressing the operation knob 28. In this way, the operation to release the parking state in a normal vehicle such as an automobile requires a complicated operation. As explained in the problem of the present invention, such an operation is an obstacle to quick steering when drifting a racing vehicle using the floor-type parking brake device 10 that a normal vehicle is equipped with.

[0049] Therefore, in the present invention, as an additional mechanism to the floor-type parking brake device 10 for a normal vehicle, a sector-and-pole meshing state switching means 54 is provided in any of the connecting components connecting the operation knob 28 of the lever body 24 and the pole 32, which can select whether the relationship between the ratchet teeth 44 of the sector 30 and the locking teeth 42 of the pole 32 is in an engageable state or in a constantly non-engaged state. In this embodiment, as the sector-and-pole meshing state switching means 54, as described above in detail, the fixing mechanism 60 is provided in the third branch piece 52 of the pole 32. This makes it possible to quickly steer the racing vehicle during drift driving, which will be described next.

[0050] [Parking operation state during drift driving of a racing vehicle] Therefore, next, the parking operation state during drift driving of a racing vehicle, which is a feature of this embodiment, will be described. The parking operation state during drift driving of a racing vehicle is shown in Fig. 8 to Fig. 9. In the parking operation state of the racing vehicle shown in Fig. 8 to Fig. 9, all of the fixing mechanisms 60 set on the third branch piece 52 of the pole 32 are in a fixed state (the state shown in Fig. 12).

[0051] The fixed state of the fixing mechanism 60 shown in Fig. 12 is a state in which the threaded bolt 66 is inserted through the threaded insertion hole 62 of the side plate 24A of the lever body 24 and the simple insertion hole 64 of the pole 32. Therefore, the pole 32 is in an integrated state in which it cannot rotate with respect to the side plate 24A of the lever body 24. Therefore, the operation knob 28 connected to the pole 32 by the link member 40 is also in an inoperable state, and cannot be pushed. In this state, the meshing relationship between the ratchet teeth 44 of the sector 30 and the locking teeth 42 of the pole 32 is in a constantly non-meshing state in which both teeth 44, 42 are constantly separated from each other.

[0052] The illustrated state in Fig. 8 shows an operation state when the operating part 26 is in a lowered position and in the parking inactive position. The illustrated state in Fig. 9 shows an operation state when the operating part 26 is in a raised position and in the parking active position. The illustrated state in Fig. 10 shows an arrangement configuration diagram showing an extracted internal mechanism of the operation mechanism unit 14 in the state shown in Fig. 8. The illustrated state in Fig. 11 shows an arrangement configuration diagram showing an extracted internal mechanism of the operation mechanism unit 14 in the state shown in Fig. 9.

[0053] In the fixed state of the fixing mechanism 60 of this embodiment, the ratchet teeth 44 of the sector 30 and the locking teeth 42 of the pawl 32 are always in a disengaged state, so that the operating member 26 can be operated without operating the operation knob 28. That is, the operating member 26 can be moved from the parking inoperative position state in which the operating member 26 is lowered as shown in Fig. 8 to the parking operative position state in which the operating member 26 is raised as shown in Fig. 9.

[0054] Furthermore, even when changing from the parking active state shown in FIG. 9 to the parking inactive state shown in FIG. 8 during drift driving in a racing vehicle, the operation part 26 can be quickly pulled down without manually operating the operation knob 28 with the thumb.

[0055] In this embodiment, as described above, drift driving operations can be performed quickly and swiftly in a racing vehicle simply by installing the fixing mechanism 60 on the pole 32 as an additional mechanism to the parking brake device in a normal vehicle such as an automobile.

[0056] Other embodiments Although specific embodiments of the present invention have been described above, the present invention can be embodied in a variety of other forms.

[0057] For example, in the above-described embodiment, the sector / pole meshing state switching means 54 is set as the fixing mechanism 60 at the position of the third branch piece 52 of the pole 32. However, it may be provided on any of the connecting components that connect the operation knob 28 of the lever body 24 and the pole 32. In other words, it may be set as a mechanism that can select the connecting component to be in either a fixed state or a released state.

[0058] In the above-described embodiment, the fixing mechanism 60 has been described as having the configuration shown in Fig. 12. However, it may also have the configuration shown in Fig. 14. The fixing mechanism 60A shown in Fig. 14 has a configuration in which the threaded bolt 66A is extended and an insertion hole 74 is also formed in the other side plate 24A, which is inserted and fitted.

[0059] Furthermore, the fixing mechanism 60 may be configured as a fixing mechanism 60B shown in Fig. 15. The fixing mechanism 60B is configured such that a fixing bolt 66B is disposed in contact with the right side surface of the third branch piece 52 of the pole 32 as viewed in Fig. 15. In this contact position state, the locking teeth 42 of the first branch piece 48 of the pole 32 and the ratchet teeth 44 of the sector 30 are in a non-meshing position state. The fixing bolt 66B can be attached in a fixed state to the side plate 24A of the lever body 24, and can also be removed.

[0060] [Effects of each invention described in "Means for solving the problems"] Finally, the effects of the above-described embodiments corresponding to each invention in the "Means for Solving the Problems" section will be listed below.

[0061] First, according to the first invention, a sector-and-pole meshing state switching means 54 is provided as an additional mechanism in the floor-type parking brake device 10. The sector-and-pole meshing state switching means 54 can set the relationship between the ratchet teeth 44 of the sector 30 and the locking teeth 42 of the pole 32 to an meshable state in a normal vehicle, thereby achieving a normal, safe parking state. In other words, the lever body 24 can be switched between the parking operating position and the parking inoperative position by operating the operation knob 28 set in the operation portion 26 of the lever body 24.

[0062] During drift driving of a racing vehicle, the meshing relationship between the ratchet teeth 44 of the sector 30 and the locking teeth 42 of the pole 32 can be always kept in a non-mesh state by the sector-pole meshing state switching means 54 installed in advance in the floor-type parking brake device 10. This allows the lever body 24 to be freely switched between the parking operating position and the parking non-operating position without operating the operation knob 28 set in the operation portion 26 of the lever body 24, and allows the steering for drift driving to be quickly switched. In other words, there is no hindrance to drift steering of a racing vehicle which requires high steering speed as in the past.

[0063] Next, according to the second invention, the sector / pole meshing state switching means 54 is composed of a fixing mechanism 60 that fixes the relative positional relationship between the pole 32 and the side plate 24A that forms the lever body 24, which are set between the two members. This fixing mechanism 60 is a mechanical mechanism that fixes the relative positional relationship between the pole 32 and the side plate 24A that forms the lever body 24, so it can be achieved with a relatively simple structure, which is advantageous in terms of cost.

[0064] Furthermore, the fixing mechanism 60 in the second invention is a mechanism that can release the fixed state between the pole 32 and the side plate 24A that forms the lever body 24. Because it is a releasable mechanism, the floor-type parking brake device 10 can be relatively easily returned from the vehicle state for racing to the normal vehicle state.

[0065] Next, according to the third aspect of the invention, the fixing mechanism 60 is composed of a simple insertion hole 64 drilled in the pole 32, a threaded insertion hole 62 drilled in the side plate 24A of the lever body 24, and a threaded bolt 66 inserted through the threaded insertion hole 62 and the simple insertion hole 64. This allows the fixing mechanism 60 to be configured with an extremely simple mechanical mechanism. Furthermore, with this fixing mechanism 60, the fixing mechanism 60 can be reliably fixed by screwing the threaded bolt 66 into the threaded insertion hole 62 of the side plate 24A.

[0066] Next, according to the fourth aspect of the invention, the setting position of the fixing mechanism 60 is a position away from the meshing position between the locking teeth 42 of the pole 32 and the ratchet teeth 44 of the sector 30, and further away from the center of rotation of the pole 32. This provides an advantage in terms of strength of the fixing mechanism 60. In other words, if the fixing mechanism 60 is located near the meshing position between the locking teeth of the pole 32 and the ratchet teeth 44 of the sector 30, the strength of the fixing mechanism 60 must be strong in terms of the meshing strength.

[0067] Next, according to the fifth aspect of the invention, the pole 32 forming the fixing mechanism 60 is formed into a Y-shape with three branch pieces, and one of the branch pieces, the third branch piece 52, is formed with a simple insertion hole 64 forming the fixing mechanism 60. This allows the fixing mechanism 60 to be set on the lever body 24 equipped with various mechanisms without affecting the other various mechanisms. [Explanation of symbols]

[0068] 10. Floor-type parking brake device 12th Floor 14 Operation mechanism section 16 Rear wheel 18 Brake mechanism 20 Brake cable 22 Base material 24 Lever body 26 Operation part 28 Operation knob 30 Sectors 32 Paul 34 Rotating shaft 36 Coil spring 40 Link member 42 Pole locking teeth 44 sector ratchet teeth 46 Axis 48 First branch piece 50 Second branch piece 52 Third branch piece 54 Means for switching the engagement state between sector and pole 56 Parking state detection switch 58 Switch piece 60 Fixing mechanism 62 Threaded through hole 64 Simple Through Hole 66 Threaded Bolt 68 Cam plate 70 Tensile Cable 72 Fixtures 74 Insertion hole

Claims

1. a parking operation state and a parking inoperable state are set by the rotational position of a lever body which is rotatably mounted on a base member fixed to the floor of the vehicle around a rotation shaft, an operation part is set on the lever body at a position separated from the rotation shaft of the lever body, and the parking operation state and the parking inoperable state can be switched by operating an operation knob provided on the operation part, A sector having ratchet teeth formed in an arc shape around the pivot axis of the lever body is disposed on the base member, and a pawl having locking teeth that engage with the ratchet teeth of the sector is rotatably disposed on the lever body, a lever body having a lever member that is connected to the pawl via a link mechanism and that is configured such that the ratchet teeth of the sector and the locking teeth of the pawl are brought into meshing engagement with each other by a spring force of a spring member that is biased against the lever member; A floor-type parking brake device in which a sector-to-pawl meshing state switching means is provided in any one of the connecting components that connect the operating knob of the lever body and the pawl, which can select whether the relationship between the ratchet teeth of the sector and the locking teeth of the pawl is in an engageable state or in a constantly non-engaged state.

2. 2. The floor-type parking brake device according to claim 1, A floor-type parking brake device in which the means for switching the meshing state of the sector and the pole is a fixing mechanism that fixes the relative positional relationship between the pole and the side plate that forms the lever body, and the fixing mechanism is a mechanism that can release the fixed state between the two members.

3. 3. A floor-type parking brake device according to claim 2, A floor-type parking brake device, wherein the fixing mechanism comprises a simple insertion hole drilled in the pole, a threaded insertion hole drilled in the side plate of the lever body, and a threaded bolt inserted into the threaded insertion hole and the simple insertion hole, and the pole and the side plate of the lever body are fixed by screwing the threaded bolt into the threaded insertion hole.

4. A floor-type parking brake device according to claim 2 or 3, A floor-type parking brake device in which the setting position of the fixing mechanism is a position spaced apart from the engagement position between the locking teeth of the pole and the ratchet teeth of the sector, and further apart from the center of rotation of the pole.

5. 5. A floor-type parking brake device according to claim 4, A floor-type parking brake device in which the pole forming the fixing mechanism is formed into a Y-shaped three-branch shape, the locking tooth is formed at the tip of the first branch, one end of a link mechanism connected to the operating knob is engaged at the tip of the second branch, and a simple insertion hole forming the fixing mechanism is formed in the third branch.

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