JPH081992Y2 - Hydraulic retarder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hydraulic retarder used as an auxiliary brake that absorbs kinetic energy of a vehicle such as a large truck to reduce the load on the service brake when the vehicle is decelerated. Regarding the device.

(Prior Art) In recent years, vehicles such as heavy-duty trucks have tended to have higher output and higher speed due to a supercharger being installed in an internal combustion engine, which requires a larger braking force when decelerating the vehicle. Tends to become. If only the service brake is used for each braking of the vehicle, the brake will be overheated due to repeated braking, or the brake shoe lining will be worn out greatly, and it is necessary to replace the lining in a short period of time. Conventionally, in order to reduce the burden of service brakes,
Although various auxiliary brakes (retarder devices) such as engine brakes and exhaust brakes are used, a retarder device having a large absorption horsepower has been demanded with the above-described higher output and higher speed.

In order to meet this demand, a fluid-type hydraulic retarder device that obtains absorbed horsepower by radiating kinetic energy to working oil by rotating a rotor with respect to a stator is provided.
"Trends of Engine Brake Auxiliary Device" Automotive Technology Vol.3
8, No. 9, 1984, pp. 1067-1074. This retarder device, as shown in FIG.
In addition to the retarder body R composed of the stator 2 fixed to the housing 11 side and the rotor 3 fixed to the rotating shaft, for example, the crankshaft 10 of the internal combustion engine, the hydraulic oil connected to the retarder body R An oil cooler (not shown in FIG. 3) arranged in the circulating oil passage for cooling the working oil that has absorbed the kinetic energy, and an oil pump 4 for replenishing the working oil circulating oil passage with the working oil in the oil reservoir. The oil pump 4 is equipped with and replenishes and replenishes the working oil in the working oil circulation oil passage (not shown in FIG. 3) into the working oil circulation oil passage when the retarder main body R operates (when the absorption horsepower is taken out). The hydraulic oil that leaks from the hydraulic oil circulation passage to the oil reservoir on the low pressure side and is insufficient is replenished.

The rotor 3 is composed of a disc portion 3a and an impeller portion 3b aligned on the outer periphery of the disc portion 3a and extending outward in the radial direction. The disc portion 3a is in the oil seal chamber 8 and the impeller portion 3b is in the rotor chamber 9, respectively. It is housed. As the rotor 3 rotates, the rotor 3 applies an axial thrust force to the stator 2 side, so that the thrust bearing 6 is provided between the rotor 3 and the stator 2.
Is interposed. A seal mechanism is provided between the oil seal chamber 8 and the rotor chamber 9 so that the high pressure hydraulic oil applied to the rotor chamber 9 does not flow out to the low pressure oil seal chamber 8.
That is, in the conventional seal mechanism, the disk portion 3a of the rotor 3 is
And the impeller portion 3b are connected to each other by forming a step portion, and the inner peripheral surface and the outer peripheral surface of the step portion are respectively formed on the stator 2 side step portion and the inner peripheral surface of the step portion formed on the inner wall of the housing 11. They are fitted with each other with a slight gap, and the oil rings 7, 7 are interposed in each fitting part. In FIG. 3, the stator 2 and the housing 1
The valve body 5 sandwiched between them accommodates a switching valve and the like arranged in the middle of the hydraulic oil circulation oil passage. Further, reference numeral 7 ′ in the figure is a seal member which prevents leakage of hydraulic oil from the oil seal chamber 8 while allowing air to flow into the oil seal chamber 8.

(Problems to be Solved by the Invention) Although the seal mechanism using the oil ring 7 is effective in preventing or suppressing the leakage of operating hydraulic pressure from the rotor chamber 9 to the oil seal chamber 8, the oil ring 7 is a contact type. Since it is a seal mechanism, the frictional resistance of the rotor 3 is large,
There is a problem that output loss is large due to rotation of the rotor 3 when the retarder body R is not in operation.

Further, if the oil ring 7 is used for sealing, even if an attempt is made to remove the hydraulic oil from the rotor chamber 9 when the retarder main body R is not in operation, the rotor chamber 9 becomes a negative pressure and the hydraulic oil cannot be promptly removed. That is, if the flow of air from the oil seal chamber 8 into the rotor chamber 9 is smooth when the hydraulic oil is removed, the hydraulic oil can be quickly removed. Therefore, the rotor chamber 9
As a sealing mechanism between the oil seal chamber 8 and the oil seal chamber 8, the working oil does not leak from the rotor chamber 9 to the oil seal chamber 8 when the retarder main body operates, and the air flows smoothly from the oil seal chamber 8 to the rotor chamber 9 when not operating. What can be done is desirable.

The present invention has been made in order to solve such a problem, the friction loss due to the rotation of the rotor when the retarder body is not operating is small, and the inflow / outflow of air from the oil seal chamber to the rotor chamber is smooth. It is an object of the present invention to provide a hydraulic retarder device having a seal mechanism configured such that hydraulic oil does not leak from the rotor chamber to the oil seal chamber when the retarder main body operates.

(Means for Solving the Problems) According to the present invention to achieve the above object, a rotor chamber is formed near the outer periphery of the housing, and an oil seal chamber is formed near the inner periphery of the housing. A hydraulic retarder device, in which a fixed stator and an impeller part of a rotor are housed in a rotor chamber, and operating energy is radiated to operating oil to obtain absorbed horsepower by rotating the rotor with respect to the stator, a housing Side stationary member and the rotor side rotating member are fitted in a non-contact state, and a fitting portion constituted by an annular step portion is provided between the rotor chamber and the oil seal chamber, so that fluid is generated as the rotor rotates. A hydraulic retarder device is provided, in which a screw seal formed of a screw thread in a direction of sending the oil from the oil seal chamber side to the rotor chamber side is formed in the fitting portion.

(Operation) The screw seal is preferably a thread groove or a screw thread formed in the direction in which the fluid is delivered from the oil seal chamber side to the rotor chamber side as the rotor rotates, and when operating the retarder device, the hydraulic oil from the rotor side is discharged. While leakage is prevented, when the retarder device is not in operation, air flows into the rotor side through the screw seal, and the hydraulic oil is discharged smoothly and quickly. Further, since the stationary member on the stator side and the rotating member on the rotor side are fitted in a non-contact state, loss due to frictional resistance does not occur when the rotor rotates.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 and 2 show a sealing mechanism portion of a hydraulic retarder device according to the present invention, and only a portion of the hydraulic retarder device corresponding to a region surrounded by a circle A of the conventional hydraulic retarder device shown in FIG. In these drawings, the components denoted by the same reference numerals as those in FIG. 3 described above, and the portions omitted from these drawings are substantially the same as the corresponding components shown in FIG. Therefore, detailed description thereof will be omitted.

FIG. 1 shows a first embodiment of the present invention, in which a rotor 3 has a disc portion 3a and an impeller 3b, and the disc portion 3a and the impeller
A step portion 3c is formed at a connection portion with 3b. The outer peripheral surface 3d of the stepped portion 3c is fitted into the inner peripheral surface 11b of the stepped portion 11a formed on the inner wall of the housing 11 with a slight gap, and the stepped portion 3c of the rotor 3 is fitted into the housing by this gap. 11 steps 11a
Never come into contact with. Then, the step portion 11 of the housing 11
A screw groove 11c is formed on the inner peripheral surface 11b of a. The thread groove 11c is formed by an appropriate number of peaks in the direction in which the fluid in the oil seal chamber 8, that is, air, is sent toward the rotor chamber 9 when the rotor 3 rotates.

On the other hand, the inner peripheral surface 3f of the stepped portion 3c of the rotor 3 is fitted to the outer peripheral surface 2b of the stepped portion 2a formed on the stator 2 side with a slight gap, and the stepped portion of the rotor 3 is fitted by this gap. 3c does not contact the stepped portion 2a on the stator 2 side. A screw groove 2c is formed on the outer peripheral surface 2b of the step portion 2a on the stator 2 side. This thread groove 2c is also provided with an appropriate number of peaks in the direction in which the air in the oil seal chamber 8 is sent out toward the rotor chamber 9 when the rotor 3 rotates.

 Next, the operation will be described.

A thread seal is formed by the thread groove 11c formed on the inner peripheral surface 11b of the stepped portion 11a of the housing 11 and the thread groove 2c formed on the outer peripheral surface 2b of the stepped portion 2a on the stator 2 side. Rotor 3
When the rotor rotates, the fluid (air and hydraulic oil) in contact with the outer peripheral surface 3d and the inner peripheral surface 3f of the stepped portion 3c of the rotor 3 is dragged in the circumferential direction by the viscosity and tries to rotate with the rotor 3.
At this time, when the fluid flows through the thread groove 11c and the thread groove 2c, the fluid tries to flow along the engraving direction of the thread groove 11c and the thread groove 2c, so that the fluid flows in the oil seal chamber 8
From the side toward the rotor chamber 9 side.

Therefore, when the retarder body R operates, the rotor chamber 9
The high pressure hydraulic oil filled in the oil leaks out toward the low pressure oil seal chamber 8, but the screw groove 11c and the screw groove 2c
Leakage is prevented by the screw sealing action or pumping action of. In addition, when the retarder body R is not operating and the hydraulic oil in the rotor chamber 9 is removed, the screw groove 11c
And the pumping action of the screw groove 2c causes the oil seal chamber 8
The air is smoothly sent from the rotor chamber 9 to the rotor chamber 9, whereby the rotor chamber 9 is not greatly depressurized to the negative pressure side, and the hydraulic oil is quickly removed from the rotor chamber 9.

FIG. 2 shows a second embodiment of the present invention, in which the same components as those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, a thread groove is formed on the step 3c side of the rotor 3. That is, instead of engraving the screw grooves 11c and 2c on the step portion 11a of the housing 11 and the step portion 2b on the rotor 2 side, the outer peripheral surface 3d of the step portion 3c facing the step portion 11a and the step portion 2c are formed. Thread grooves 3e and 3g are formed on the inner peripheral surface 3f of the facing step portion 3c, respectively, and these thread grooves 3e and 3g form a thread seal. In the second embodiment, the thread groove is the step portion of the rotor 3.
Other than the fact that it is engraved on the 3c side, the configuration is the same as that of the first embodiment, and substantially the same action and effect as in the case of the first embodiment are obtained, and the action of these screw grooves is Since it can be easily inferred from the description of the first embodiment, the description thereof will be omitted below.

In the above-mentioned embodiments, the screw seals are all engraved as screw grooves on the outer peripheral surface or the inner peripheral surface of the step portion, but instead of this, the screw threads protrudingly formed on the outer peripheral surface or the inner peripheral surface of the step portion. May be In this case, if the screw threads and the inner peripheral surface or the outer peripheral surface of the stepped portion facing the screw threads are fitted with a slight gap therebetween, they will not come into contact with each other when the rotor 3 rotates.

INDUSTRIAL APPLICABILITY The hydraulic retarder device of the present invention may be used in various fields, for example, it may be used as an auxiliary brake during deceleration of a vehicle, or it may be attached to a wire winding cylinder of a crane device to suspend a heavy object. It may be used as a braking device when gradually selling.

(Effect of the Invention) As described in detail above, according to the hydraulic retarder device of the present invention, a fitting portion is provided in which the stationary member on the stator side and the rotating member on the rotor side are fitted in a non-contact state, and the fitting portion is provided. Since a screw seal is formed at the joint, frictional resistance due to rotation of the rotor is reduced, output loss when the retarder device is not operating can be reduced, and leakage of hydraulic oil can be prevented by the screw seal. I can. Further, when the retarder device is not in operation, the air smoothly flows in from the screw seal, and the working oil can be quickly removed.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, an enlarged view of a main part of a sealing mechanism portion of a hydraulic retarder device, and FIG. 2 shows a second embodiment of the present invention, which is a seal similar to that shown in FIG. FIG. 3 is an enlarged view of a main part of a mechanical portion, and FIG. 3 is a sectional view for explaining a seal mechanism of a conventional hydraulic retarder device. 2 ... Stator, 2a ... Step, 2c ... Thread groove (screw seal), 3 ... Rotor, 3c ... Step, 3e, 3g ... Thread groove (screw seal), 8 ... Oil seal chamber, 9 ...... Rotor chamber, 4 …… Oil pump, 11 …… Housing, 11a ……
Step, 11c ... Screw groove (screw seal), R ... Retarder body.

Claims (1)

[Scope of utility model registration request] 1. A rotor chamber is formed near the outer periphery of the housing, and an oil seal chamber is formed near the inner periphery of the housing. A stator fixed to the housing and an impeller portion of the rotor are accommodated in the rotor chamber. In addition, in the hydraulic retarder device, in which kinetic energy is radiated to hydraulic oil to absorb absorbed horsepower by rotating the rotor with respect to the stator, the stationary member on the housing side and the rotating member on the rotor side are not in contact with each other. A fitting portion which is fitted in a state and is formed of an annular step portion is provided between the rotor chamber and the oil seal chamber, and fluid is rotated from the oil seal chamber side to the rotor chamber side as the rotor rotates. A hydraulic retarder device, characterized in that a screw seal made of a screw thread in a direction to be sent to is formed in the fitting portion.