CN208816562U - Liquid braking device - Google Patents

Abstract

The utility model discloses a kind of liquid braking device, which includes the shell and rear cover fitted together, and piston, plunger shaft, clutch and output shaft inside shell and rear cover.Hydraulic pressure in plunger shaft drives piston motion, so that clutch is disengaged or is engaged, so as to selectively allow for or output shaft is prevented to rotate.Hydraulic fluid port is provided on the outer circumferential of rear cover.Hydraulic oil channel includes the first passage radially extended and the second channel axially extended.First passage is connected to plunger shaft.Lead to first passage for one end of second channel, and the other end leads to hydraulic fluid port.Choke plug and locating piece are provided in first passage.Locating piece has interconnected axial hole and radial hole, and axial hole is directed at the throttle orifice of choke plug, and radial hole is directed at second channel.By using above-mentioned construction, allows hydraulic fluid port to be arranged and covered after.It is interfered in this way, avoiding hydraulic fluid port with other external equipments.

Description

Liquid braking device

Technical field

The utility model relates to a kind of liquid braking device, relate more specifically to a kind of with the hydraulic fluid port covered after being arranged in Liquid braking device.

Background technique

Figure 1A and Figure 1B respectively illustrates the perspective view and side view of a kind of existing liquid braking device.Such as Figure 1A and Figure 1B Shown, this liquid braking device has shell 1, rear cover 12 and output shaft 4.This liquid braking device also has positioned at 1 He of shell Piston, plunger shaft, clutch inside rear cover 12.Hydraulic pressure in plunger shaft drives piston motion, keeps clutch de- From engagement or engagement, so as to selectively allow for output shaft 4 to rotate or output shaft 4 is prevented to rotate.Output shaft 4 is from shell 1 Front stretch out, and other associated components are connected to by flat key 18 and locking nut 28, such as wheel hub or brake disc are (not It shows).Rear cover 12 is assemblied in the rear portion of shell 1.The liquid braking device also has hydraulic fluid port 21.Hydraulic fluid port 21 and setting are in hydraulic braking Hydraulic oil channel connection inside device, and can be connected to outer liquid pressure oil supply/device for transferring, to liquid braking device Internal supply hydraulic fluid and the hydraulic oil inside liquid braking device is expelled to outside.In this liquid braking device, hydraulic fluid port 21 On shell 1.It should be noted that hydraulic fluid port 21 shown in Figure 1A and Figure 1B has temporarily been sealed by sealing-plug 26, thus Hydraulic fluid port 21 in the open state is not shown in Figure 1A and Figure 1B.

Inventor is in practice, it has been found that the hydraulic fluid port 21 of this layout may be unable to satisfy the demand under certain specific conditions. Such as, it usually needs pipe fitting is installed on hydraulic fluid port 21, pipe fitting is then connected to outer liquid pressure oil supply/discharge and is set It is standby.However, the pipe fitting can be interfered with the rack of vehicle after pipe fitting is installed on hydraulic fluid port 21, as a result cause It is difficult to for liquid braking device being installed in place；Alternatively, after being installed in place the brake for being fitted without pipe fitting, 21 meeting of hydraulic fluid port Very close to the rack of vehicle, as a result lead to be difficult to that pipe fitting is installed on hydraulic fluid port 21 in the next steps.

Utility model content

In order to solve the above-mentioned technical problem, inventor thinks to can change the position of hydraulic fluid port, such as hydraulic fluid port is redesigned It covers, rather than is located on the shell of liquid braking device at after liquid braking device.

For this purpose, the utility model provides a kind of liquid braking device.The liquid braking device includes the shell fitted together And rear cover, and piston, plunger shaft, clutch and output shaft inside the shell and rear cover.In the plunger shaft Hydraulic pressure drive the piston motion, so that the clutch is disengaged or is engaged, so as to selectively allow for The output shaft rotation prevents the output shaft from rotating.Hydraulic fluid port, the hydraulic fluid port are provided on the outer circumferential of the rear cover It is connected to and the hydraulic oil channel inside the liquid braking device is set with the plunger shaft.

Choke plug and locating piece are provided in the first passage.The choke plug has throttle orifice.The locating piece The choke plug is positioned and the flowing of hydraulic oil is guided.

The hydraulic oil channel includes the first passage radially extended and the second channel axially extended, described First passage is connected to the plunger shaft, and lead to the first passage for one end of the second channel, the second channel it is another The hydraulic fluid port is led in one end.The locating piece has interconnected axial hole and radial hole, and the axial hole is directed at the section The stifled throttle orifice of stream, the radial hole are directed at the second channel.

The first passage has the opening towards the outside of the liquid braking device.The opening is closed by seal plug. The locating piece is arranged between the seal plug and the choke plug in radial directions to position the choke plug.

The locating piece include in the axial direction first end section, the second end section and be located at the first end section With the centre portion between the second end section, the first end section is located at the close throttling of the locating piece Stifled side, the second end section are located at the side far from the choke plug of the locating piece.The centre portion Radial dimension is less than the radial dimension of the first end section and the second end section, and the radial hole of the locating piece is set It sets in the centre portion.

When observing along the locating piece radial, the centre portion is relative to the first end section and described The second end section forms arc-shaped depression portion or rectangular recess.

The locating piece includes first end section and the second end section in the axial direction.The diameter of the second end section It is less than the radial dimension of the first end section to size.The radial hole of the locating piece is arranged in the second end section In.

The first end section is located at the side close to the choke plug of the locating piece, the second end section Positioned at the side far from the choke plug of the locating piece.Alternatively, the first end section is located at the remote of the locating piece Side from the choke plug, the second end section are located at the side close to the choke plug of the locating piece.

The locating piece and the choke plug are one-piece members.The one-piece member includes interconnected radial direction Hole, axial hole and throttle orifice.The radial hole is directed at the second channel.The radial hole is connected with the throttle orifice.Institute The size for stating radial hole is greater than the size of the throttle orifice.

The hydraulic oil channel includes the channel section across both the shell and the rear cover.

In the joint of the shell and the rear cover, sealing ring is provided with around the channel section.

The liquid braking device further includes multiple fastening bolts, the rear cover to be fastened on the shell, wherein At least two tightly with bolt and the channel section mutually close to and be located at the two sides of the channel section.

Detailed description of the invention

It is hereinafter retouched in more detail based on exemplary embodiment and in conjunction with attached drawing for the ease of understanding the utility model, State the utility model.The same or similar component is indicated using the same or similar appended drawing reference in the accompanying drawings.It should be understood that , attached drawing is only illustrative, and the size and ratio of the component in attached drawing are not necessarily accurate.

Figure 1A and Figure 1B is the perspective schematic view and side view of a kind of liquid braking device in the prior art respectively.

Fig. 2A is the perspective schematic view of the liquid braking device of one embodiment according to the present utility model.

Fig. 2 B is the front view of the liquid braking device in Fig. 2A.

Fig. 2 C is the rearview of the liquid braking device in Fig. 2A.

Fig. 2 D is the partial enlarged view of the region D in Fig. 2 C.

Fig. 2 E is the cross-sectional view along the cutting plane E-E interception in Fig. 2 B.

Fig. 3 A is the partial enlarged view of the region A in Fig. 2 E.

Fig. 3 B and Fig. 3 C are the perspective view and front view of locating piece shown in Fig. 3 A respectively.

Fig. 3 D is the cross-sectional view along the cutting plane I-I interception in Fig. 3 C.

Fig. 4 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.

Fig. 4 B, Fig. 4 C and Fig. 4 D are the perspective view, front view and side view of locating piece shown in Fig. 4 A respectively.

Fig. 5 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.

Fig. 5 B and Fig. 5 C are the perspective view and front view of locating piece shown in Fig. 5 A respectively.

Fig. 5 D is the cross-sectional view along the cutting plane II-II interception in Fig. 5 C.

Fig. 6 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.

Fig. 6 B and Fig. 6 C are the perspective view and front view of locating piece shown in Fig. 6 A respectively.

Fig. 6 D is the cross-sectional view along the cutting plane III-III interception in Fig. 6 C.

Fig. 7 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.

Fig. 7 B and Fig. 7 C are throttling-locating piece perspective view and front view shown in Fig. 7 A respectively.

Fig. 7 D is the cross-sectional view along the cutting plane IV-IV interception in Fig. 7 C.

Specific embodiment

Hydraulic braking in the prior art is described by reference to Figure 1A and Figure 1B in " background technique " part above The overall construction of device, therefore hereinafter repeat no more.It describes next with reference to Fig. 2A to Fig. 7 D according to the utility model Embodiment liquid braking device.

Fig. 2A is the perspective schematic view of the liquid braking device of one embodiment according to the present utility model.Fig. 2 B is Fig. 2A In liquid braking device front view.Fig. 2 C is the rearview of the liquid braking device in Fig. 2A.Fig. 2 D is the region D in Fig. 2 C Partial enlarged view.

As shown, only from the appearance from the point of view of, according to the liquid braking device of the present embodiment and hydraulic system in the prior art The main distinction of dynamic device is that hydraulic fluid port 23 is located on rear cover 12, rather than is located on shell 1.In addition, in the hydraulic of the prior art In brake, rear cover 12 is fastened to shell 1 using 4 fastening bolts that the circumferencial direction along rear cover 12 is evenly distributed On.And in the present embodiment, 1 fastening bolt 17 is extraly additionally arranged near hydraulic fluid port 23, so as to by rear cover 12 more closely It is fastened on shell 1.This will be described in more detail later.

In addition, only from the appearance from the point of view of, it is believed that the liquid braking device according to the present embodiment is showed what is be described above On the basis of having the liquid braking device of technology, it is further additionally arranged hydraulic fluid port 23 on rear cover 12, and the oil being initially positioned on shell 1 Mouth 21 is not entirely eliminated, but is closely sealed by seal head 22, and it is logical to be used as described below first Road.In certain circumstances, seal head 22 can also be removed, in this way, the hydraulic fluid port being initially positioned on shell 1 can be opened 21 (hereinafter referred to as spare hydraulic fluid ports) and play the original effect of the hydraulic fluid port.That is, although the liquid of the utility model Pressure brake is characterized mainly in that hydraulic fluid port 23 is located on rear cover 12, but the possibility restored using spare hydraulic fluid port 21 is not precluded Property.

Fig. 2 E is the cross-sectional view along the cutting plane E-E interception in Fig. 2 B.As shown in Figure 2 E, in the liquid according to the present embodiment It presses in brake, rear cover 12 is fastened on shell 1 using multiple fastening bolts 17.At the joint surface of rear cover 12 and shell 1, It is provided with sealing ring 16, the inner cavity of liquid braking device is consequently formed.One end (rear end) of output shaft 4 is arranged in the inner cavity.It is defeated The other end (front end) of shaft 4 is stretched out and is in gradually-reducing shape from the opening 27 for the front for being located at shell 1, then passes through 18 He of flat key Locking nut 28 is connected to other associated components, such as wheel hub or brake disc (not shown).Opening 27 in the front of shell 1 Place, is provided with axle envelope 2 on the periphery of output shaft 4.

In the inner cavity of liquid braking device, output shaft 4 is supported by roller bearing 3 and needle bearing 14, wherein roller bearing 3 than needle bearing 14 closer to axle envelope 2.In addition, plane needle bearing 13 is provided at the rear end face of output shaft 4, in this way, defeated The rear end face of shaft 4 can be resisted against on the inner surface of rear cover 12 by plane needle bearing 13.It is provided on rear cover 12 Oil leak hole, and sealed the oil leak hole using sealing bolt 15.

Between roller bearing 3 and needle bearing 14, one group of movable friction plate 6 is matched using such as involute spline (not shown) On the periphery for closing output shaft 4, to transmit the torque of output shaft 4 and for compressing or unclamping with one group of static friction plate 5.It is quiet Friction plate 5 is fixed on the locking groove (not shown) of shell 1.Movable friction plate 6 and static friction plate 5 form clutch.It can manage Solution, can also use other various forms of clutches.Piston 8 is arranged around output shaft 4.In piston 8 and shell 1 Between formed plunger shaft 29.Sealing ring 9 and 10 is provided between piston 8 and the inner wall of shell 1, to by liquid braking device 29 chamber of high pressure piston chamber in inner cavity is separated with low pressure chamber.Piston 8 can be in the hydraulic oil in one group of spring 11 and plunger shaft 29 Pressure effect under, move in the longitudinal direction.One end (rear end) of spring 11 is fixed on the inner wall of rear cover 12, spring 11 The other end (front end) pushes piston 8.

Therefore, not hydraulic oil pressure effect in the case where, piston 8 by spring 11 pushing and drive static friction Piece 5 is pressed on movable friction plate 6.At this point, not relatively rotating between static friction plate 5 and movable friction plate 6, at liquid braking device In on-position.

As shown in Figure 2 E, hydraulic fluid port 23 is provided on rear cover 12.Although the circumferential direction of rear cover 12 is arranged in hydraulic fluid port 23 in Fig. 2 E Outside, it should be appreciated that hydraulic fluid port 23 also can be set at the back side of rear cover 12, such as the position opposite with second channel 19 Place.Hydraulic fluid port 23 shown in Fig. 2 E is temporarily sealed by sealing-plug 26.It, can will be close when needing to install pipe fitting on hydraulic fluid port 23 Blocking 26 removes.The first passage 21 being connected to the inner cavity of liquid braking device is become by the spare hydraulic fluid port 21 that seal head 22 blocks. First passage 21 extends along vertical direction on the whole, and is connected to the plunger shaft 29 inside liquid braking device.In hydraulic fluid port 23 The second channel 19 extended approximately along horizontal direction is provided between first passage 21.A part of second channel 19 is located at In shell 1, another part of second channel 19 is located in rear cover 12, is thus connected to hydraulic fluid port 23 with first passage 21.

Successively enter in the inner cavity of liquid braking device via hydraulic fluid port 23, second channel 19 and first passage 21 in hydraulic oil Later, piston 8 overcomes the thrust of spring 11 under the pressure effect of hydraulic oil and moves backward, and thereby eliminates movable friction plate 6 Compaction between static friction plate 5, so that movable friction plate 6 be allowed to rotate with output shaft 4.At this point, at liquid braking device In release conditions, that is, release on-position.When on-position to be restored, hydraulic oil is via first passage 21, second channel 19 It is discharged with hydraulic fluid port 23, movable friction plate 6 and static friction plate 5 mesh together again, and liquid braking device is in on-position.

In addition, in order to avoid the hydraulic oil from second channel 19 is from the joint leadkage of shell 1 and rear cover 12, Ke Yi Sealing ring 25 is set around second channel 19.In order to be properly positioned sealing ring 25, can be arranged on shell 1 or rear cover 12 Counterbore 24.It is the situation that counterbore 24 is arranged on shell 1 shown in Fig. 2 E.In addition, in order to which rear cover 12 is more closely fastened To avoid the hydraulic oil from second channel 19 from the joint leadkage of shell 1 and rear cover 12 on to shell 1, inventor is second The two sides in channel 19 are provided with fastening bolt 17, as shown in Figure 2 C and 2 D shown in FIG..By comparing Figure 1A and Fig. 2A or Fig. 2 C 1 is additionally arranged on the basis of the liquid braking device of the prior art compared with it is found that being equivalent to according to the liquid braking device of the present embodiment Fastening bolt 17.It is tested by compression shock, the reliability of above-mentioned setting sealing ring 25 and the scheme for adding fastening bolt 17 is non- Chang Gao, and simultaneously indistinctively increase manufacturing cost, thus there is good industrial applicibility.

Fig. 3 A is the partial enlarged view of the region A in Fig. 2 E.Fig. 3 B and Fig. 3 C are locating piece shown in Fig. 3 A respectively Perspective view and front view.Fig. 3 D is the cross-sectional view along the cutting plane I-I interception in Fig. 3 C.

As shown in Fig. 2 E and Fig. 3 A to Fig. 3 D, choke plug 20 and locating piece 7 are provided in first passage 21.Choke plug 20 Center at be provided with throttle orifice.Locating piece 7 is arranged between seal head 22 and choke plug 20, and choke plug 20 is positioned, and And it is provided with hole in locating piece 7, the hydraulic oil of the throttle orifice with convection current through choke plug 20 guides.

Specifically, locating piece 7 is in the form of a column on the whole.One end of locating piece 7 is resisted against on choke plug 20, locating piece 7 The other end is resisted against on sealing-plug 22.Locating piece 7 has interconnected axial hole 72 and radial hole 73, to guide hydraulic oil It flows into second channel 19 from first passage 21 or is flowed into first passage 21 from second channel 19.Setting is shown in the figure The case where two radial hole 73, it should be appreciated, however, that less or more radial hole 73 can be set.These radial holes 73 In at least one radial hole 73 alignment second channel 19 one end (being in figure 3 a right end) for being connected to first passage 21 Opening, and axial hole 72 is directed at the throttle orifice of choke plug 20.In this way, hydraulic oil can via choke plug 20 and locating piece 7 and It is flowed between first passage 21 and second channel 19.

[variation example 1]

Inventors noted that in the above-described embodiments, although the axial position of locating piece 7 and choke plug 20 is defined and (changes Sentence is talked about, and locating piece 7 and choke plug 20 all cannot be along their axial movements), but locating piece 7 is possible to the axis along it It rotates, that is, circumferential movement occurs).As a result, radial hole 73 may be no longer aligned with connecting with first passage 21 for second channel 19 The opening of logical one end, and it is in alignment with the inner wall of first passage 21, and then cause hydraulic oil cannot be swimmingly in first passage 21 It is flowed between second channel 19.

In order to eliminate above-mentioned potential disadvantage, inventor improves the construction of locating piece 7.

Fig. 4 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.Fig. 4 B, Fig. 4 C and Fig. 4 D are the perspective view, front view and side view of locating piece shown in Fig. 4 A respectively.

As shown in Fig. 4 B to Fig. 4 D, in the axial direction of locating piece 7, locating piece 7 includes two end sections 71 and is located at this Centre portion 74 between two end sections 71.The diameter of centre portion 74 is less than the diameter of end section 71.More specifically, Centre portion 74 forms arc-shaped depression portion relative to two end sections 71, so that locating piece 7 is in the shape of an " I " on the whole.In this way, When by locating piece 7 be arranged in first passage 21 after, be constantly present between centre portion 74 and the inner wall of first passage 21 compared with Big gap.Radial hole 73 is arranged in centre portion 74.Therefore, even if locating piece 7 rotates along its axis, so that Radial hole 73 is not precisely directed to the opening of the one end of second channel 19 being connected to first passage 21, and hydraulic oil still is able to It is swimmingly flowed between first passage 21 and second channel 19 by above-mentioned gap.

[variation example 2]

Fig. 5 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.Fig. 5 B and Fig. 5 C are the perspective view and front view of locating piece shown in Fig. 5 A respectively.Fig. 5 D is along Fig. 5 C In cutting plane II-II interception cross-sectional view.

The construction of locating piece 7 shown in Fig. 5 A to Fig. 5 D is roughly the same with the construction of locating piece 7 in variation example 1, different What place was only that the centre portion 75 of locating piece 7 shown in Fig. 5 A to Fig. 5 D formed relative to two end sections 71 is not arc Shape recess portion, but rectangular recess.

[variation example 3]

Fig. 6 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.Fig. 6 B and Fig. 6 C are the perspective view and front view of locating piece shown in Fig. 6 A respectively.Fig. 6 D is along Fig. 6 C In cutting plane III-III interception cross-sectional view.

In the present embodiment, locating piece 7 includes first end section 71 and the second end section 76 in the axial direction.First end Portion's section 71 is located at the side (downside in Fig. 6 A) of the close choke plug 20 of locating piece 7.The second end section 76 is located at positioning The side (upside in Fig. 6 A) of the separate choke plug 20 of block 7.The radial dimension of the second end section 76 is less than first end area The radial dimension of section 71.In this way, the second end section 76 and first leads to after being arranged locating piece 7 in first passage 21 Biggish gap is constantly present between the inner wall in road 21.Radial hole 73 is arranged in the second end section 76.It therefore ensures that hydraulic Oil can swimmingly be flowed between first passage 21 and second channel 19 by above-mentioned gap.

, it is understood that can also be arranged on the contrary with above situation, that is, the first end section 71 that will be relatively large in diameter The side of the separate choke plug 20 of locating piece 7 is set, and locating piece 7 is arranged in the lesser the second end section 76 of diameter Close to the side of choke plug 20.

[variation example 4]

Fig. 7 A is the region A of the liquid braking device of another embodiment according to the present utility model corresponded in Fig. 2 E Partial enlarged view.Fig. 7 B and Fig. 7 C are throttling-locating piece perspective view and front view shown in Fig. 7 A respectively.Fig. 7 D be along The cross-sectional view of cutting plane IV-IV interception in Fig. 7 C.

Two not discrete components of throttling-locating piece 7 shown in Fig. 7 A to Fig. 7 D, one-piece member.Specifically It says, throttling-locating piece 7 includes the first end section 77 and the lesser the second end section 71 of diameter being relatively large in diameter, and is set It is equipped with throttle orifice 78, axial hole 72 and radial hole 73.

By using this integral type throttling-locating piece 7, assembling process can simplify, improve assembly efficiency.

It is carried out above by referring to technical purpose, technical solution and technical effect of the specific embodiment to the utility model Detailed description.It should be understood that above-described embodiment is merely exemplary, rather than it is restrictive.In the utility model Spirit and principle within, any modification, equivalent substitution, improvement and etc. that those skilled in the art makes are comprised in this reality Within novel protection scope.

Claims (10)

1. a kind of liquid braking device, including the shell and rear cover fitted together, and inside the shell and rear cover Piston, plunger shaft, clutch and output shaft, piston motion described in the hydraulic power drive in the plunger shaft, make the clutch Mechanism is disengaged or engages, so as to selectively allow for the output shaft to rotate or prevent the output shaft to rotate, In,

Hydraulic fluid port is provided on the outer circumferential of the rear cover, the hydraulic fluid port passes through the liquid being arranged in inside the liquid braking device Pressure oil passage and be connected to the plunger shaft.

2. liquid braking device according to claim 1, wherein

Choke plug and locating piece are provided in the hydraulic oil channel, the choke plug has throttle orifice, and the locating piece will The choke plug is positioned and is guided to the flowing of hydraulic oil.

3. liquid braking device according to claim 1, wherein

The hydraulic oil channel includes the first passage radially extended and the second channel axially extended, and described first Channel is connected to the plunger shaft, and lead to the first passage for one end of the second channel, the other end of the second channel Lead to the hydraulic fluid port,

Choke plug and locating piece are provided in the first passage, the choke plug has throttle orifice, and

The locating piece has interconnected axial hole and radial hole, and the axial hole is directed at the throttle orifice of the choke plug, The radial hole is directed at the second channel.

4. liquid braking device according to claim 3, wherein

The first passage has the opening towards the outside of the liquid braking device, and the opening is closed by seal plug, described Locating piece is arranged between the seal plug and the choke plug in radial directions to position the choke plug.

5. according to liquid braking device described in any one claim in claim 2 to 4, wherein

The locating piece include in the axial direction first end section, the second end section and be located at the first end section and institute The centre portion between the second end section is stated, the first end section is located at the close choke plug of the locating piece Side, the second end section are located at the side far from the choke plug of the locating piece；And

The radial dimension of the centre portion is less than the radial dimension of the first end section and the second end section, institute The radial hole for stating locating piece is arranged in the centre portion.

6. liquid braking device according to claim 5, wherein

When along the radial observation of the locating piece, the centre portion is relative to the first end section and described second End section forms arc-shaped depression portion or rectangular recess.

7. according to liquid braking device described in any one claim in claim 2 to 4, wherein

The locating piece includes first end section and the second end section in the axial direction；

The radial dimension of the second end section is less than the radial dimension of the first end section, the radial direction of the locating piece Hole is arranged in the second end section；

The first end section is located at the side close to the choke plug of the locating piece, and the second end section is located at The side far from the choke plug of the locating piece, or

The first end section is located at the side far from the choke plug of the locating piece, and the second end section is located at The side close to the choke plug of the locating piece.

8. liquid braking device according to claim 3 or 4, wherein

The locating piece and the choke plug are one-piece members, and the one-piece member includes interconnected radial hole, axis To hole and throttle orifice, the radial hole is directed at the second channel, and the radial hole is connected with the throttle orifice, and described The size of radial hole is greater than the size of the throttle orifice.

9. liquid braking device according to claim 1, wherein

The hydraulic oil channel includes the channel section across both the shell and the rear cover, and

In the joint of the shell and the rear cover, sealing ring is provided with around the channel section.

10. liquid braking device according to claim 9 further includes multiple fastening bolts, the rear cover to be fastened to On the shell, wherein at least two fastening bolts and the channel section mutually close to and be located at the channel section Two sides.