JPH0483919A - Hydraulic power transmission coupling - Google Patents

Abstract

PURPOSE:To make reduction of processing cost possible by forming a narrow groove on closely adhered or movably contacting surface of either a valve plug or a member closely adheres or movably contacts with the valve plug, and forming a flow resistance generating means with a mate member that closely adheres or movably contacts and the narrow groove. CONSTITUTION:When rotational difference occurs between a cam 1 and a rotor 5, a plunger 8 in the course of a discharge stroke is pushed to the axial direction by the cam surface 2 of the cam 1. The plunger 8 pushes out the oil in a plunger chamber 7 to an intake/discharge hole 10, the discharge port 14 of a rotary valve 11, and a communicating groove 15. The oil pushed out is supplied to an intake passage 13 by a narrow groove 17A that functions as an orifice, when the oil pressure of the discharge port 14, the communicating groove 15 and the plunger chamber 7 is raised by flow resistance, and reaction force is generated in the plunger 8 to transmit torque between the cam 1 and the rotor 5. If the cam 1 further rotates, it becomes an intake stroke, oil is sucked to the plunger chamber 7 passing through the intake passage 13, the intake port 12, and the intake/discharge hole 10, and the plunger 8 returns moving along the cam surface 2 of the cam 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic power transmission joint used for distributing driving force in a vehicle.

[Prior Art] The present applicant has proposed a hydraulic power transmission joint as shown in FIG.

That is, this hydraulic power transmission joint is provided between relatively rotatable input and output shafts, is connected to the one shaft, and has a cam housing 52 formed with a cam surface 51 having two or more cam ridges on the inner surface. and connected to the other shaft and rotatably housed within the cam housing 52,
A rotor 54 forming a plurality of plunger chambers 53 is housed in each of the plurality of plunger chambers 53 so as to be able to reciprocate under the pressure of a return spring 55, and when the two shafts rotate relative to each other, the cam a plurality of plungers 56 driven by the surface 51; a suction/discharge hole 57 that is open on one end surface of the rotor 54 that does not accommodate the plungers 56 and communicates with the plunger chamber 53; and a valve body 60 having a plurality of suction boats 58 and discharge boats 59 formed on its surface, which are positioned in a predetermined relationship with the cam housing 52 and act as suction valves and discharge valves. , in a power transmission joint that includes means for generating flow resistance in a discharge passage communicating with the plunger chamber 53 and transmits torque according to a rotational speed difference between the two shafts, from an outer peripheral portion of the valve body 60 to the discharge boat. A through hole 62 is formed toward the discharge boat 59, and a small hole 63 is formed which communicates with the through hole 62 and the discharge boat 59, and the small hole 63 is used as the flow resistance generating means.

[Problems to be Solved by the Invention] However, in such conventional hydraulic power transmission joints, the orifice as a flow resistance generating means is formed by drilling holes in two stages from the outer periphery of the valve body. Therefore, there was a problem in that a special processing process was required for processing the orifice, which increased the processing cost of the valve body.

The present invention has been made in view of such conventional problems, and the orifice can be molded at the same time when the valve body or a mating member that comes into close contact with the valve body is molded, thereby reducing the processing cost of the orifice. The aim is to reduce the

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a shaft that is provided between relatively rotatable input and output shafts, is connected to the one shaft, and has two or more peaks on the inner surface. a cam housing having a cam surface formed therein; a rotor connected to the other shaft and rotatably housed within the cam housing and forming a plurality of plunger chambers; and each of the plurality of plunger chambers. a plurality of plungers that are housed in a reciprocating manner under the pressure of a return spring and that are driven by the cam surface when the two shafts rotate relative to each other; and a plurality of plungers that are formed on the rotor and communicate with the plunger chamber. A plurality of valves are arranged in a predetermined relationship between the suction and discharge holes and the cam housing so as to be in rotatable and sliding contact with the end surface of the rotor, and act as suction valves or discharge valves depending on the positional relationship with the suction and discharge holes. A valve body having a suction port and a discharge boat formed on its sliding surface, and a means for generating flow resistance by the flow of discharged oil due to the driving of the plunger, and transmitting torque according to the rotational speed difference between the two shafts. In a hydraulic power transmission joint, a narrow groove is formed in the close contact or sliding contact surface of either the valve body or a member that comes in close contact or sliding contact with the valve body, and a narrow groove is formed in the close contact or sliding contact surface of the valve body or a member that comes in close contact or sliding contact with the other member and the narrow groove. , an orifice is defined to serve as the flow resistance generating means.

[Function] In the present invention, a thin groove is formed on the contact surface of either the valve body or a partner member that comes into close contact with the valve body, and an orifice is defined by the partner member that comes in close contact and the narrow groove. When molding the valve body or a mating member that comes into close contact with the valve body, the narrow groove can be molded in the entire mold at the same time.

Therefore, the conventional hole machining process for orifice machining can be eliminated, and costs can be reduced.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 and 2 are diagrams showing a first embodiment of the present invention.

First, to explain the configuration, in FIGS. 1 and 2, 1 is a cam with a cam surface 2 having two or more peaks on its inner surface, and the cam 1 is connected to an output shaft. Rotates as one. Further, the cam 1 is fixed to a cam housing 4, and the cam housing 4 rotates integrally with the cam 1.

A rotor 5 is rotatably housed in the cam housing 4. The rotor 5 is coupled to the input shaft 6 and rotates together with the input shaft 6.

A plurality of plunger chambers 7 are formed in the rotor 5 in the axial direction, and a plurality of plungers 8 are formed in the plunger chamber 7.
is slidably housed via a return spring 9. Further, a plurality of suction and discharge holes 10 are formed in the rotor 5 so as to communicate with each plunger chamber 7.

Reference numeral 11 denotes a rotary valve (valve body) in which a suction port 12, a suction passage 13, and a discharge boat 14 are formed on the sliding surface (surface) that contacts the rotor 5, and a communication groove 15 is formed in the back surface of the rotary valve 11. A lid member 16 is provided in close contact with the communication groove 15.

Furthermore, a groove 17 is formed on the surface of the rotary valve 11, and a narrow groove 17A is formed between the groove 17 and the discharge boat 14.

The narrow groove 17A and the rotor 5 in sliding contact with the rotary valve 11 constitute an orifice which is a flow resistance generating means.

Further, the rotary valve 11 has a positioning protrusion 19 that engages with a notch 18 formed on the inner circumference of the cam housing 4.

The notch 18 and the protrusion 19 constitute a positioning mechanism that determines the phase relationship between the cam 1 and the rotary valve 11.

When the plunger 8 is in the suction stroke, the suction port 12 of the rotary valve 11 and the suction/discharge hole 10 of the rotor 5 communicate with each other, and the suction path 13, suction port 12,
Through the suction and discharge holes 10 of the rotor 5, the plunger chamber 7
The oil can be inhaled.

Further, when the plunger 8 is in the discharge stroke, the relationship is opposite to the suction stroke, and the suction and discharge hole 10 of the rotor 5 communicates with the communication groove 15 via the discharge boat 14 of the rotary valve 11.

A thrust block 20 rotates integrally with the cam housing 4, and supports the input shaft 6 via a bearing 21. A needle bearing 22 is interposed between the thrust block 20 and the rotary valve 11, and the friction torque on the needle bearing 22 side is transmitted to the rotor 5.
The friction torque is set to be smaller than the friction torque between Therefore, when the direction of differential rotation changes, the rotary valve 11 rotates together with the rotor 5, rotates until the positioning protrusion 19 of the rotary valve 11 hits the notch 18 of the cam housing 4, and then becomes integral with the cam housing 4. Rotate with. Thereby, the suction and discharge holes 10 are forcibly opened and closed at a predetermined timing even during forward rotation or reverse rotation.

23 is an accumulator piston that rotates integrally with the cam housing 4, and the accumulator piston 23 moves according to internal pressure. A return spring 25 is interposed between the accumulator piston 23 and the retainer 24. Note that 26 is an oil seal, 27 is a stop ring, 28 is a mounting hole, 29 is an oil fill hole, and 30 is a bearing.

Next, the effect will be explained.

When there is no difference in rotation between the cam 1 and the rotor 5, the plunger 8 does not operate and no torque is transmitted. Note that at this time, the plunger 8 is pressed against the cam surface 2 by the return spring 9.

Next, when a rotation difference occurs between the cam 1 and the rotor 5, the plunger 8, which is in the discharge stroke, is pushed in the axial direction by the cam surface 2 of the cam 1.

Therefore, the plunger 8 pushes out the oil in the plunger chamber 7 from the suction and discharge hole 10 to the discharge boat 14 and the communication groove 15 of the rotary valve 11.

The oil pushed out into the discharge boat 14 and the communication groove 15 is supplied to the suction passage 13 through the narrow groove 17A serving as an orifice. At this time, the hydraulic pressure in the discharge boat 14, the communication groove 15, and the plunger chamber 7 increases due to the flow resistance of the narrow groove 17A serving as an orifice, and a reaction force is generated in the plunger 8. Torque is generated by rotating the cam 1 against this plunger reaction force, and the torque is transmitted between the cam 1 and the rotor 5.

Furthermore, when the cam 1 rotates, a suction stroke occurs, and oil is sucked into the plunger chamber 7 through the suction passage 13, suction boat 12, and suction/discharge hole 10, and the plunger 8 moves along the cam surface 2 of the cam 1. return.

In this case, the suction and discharge holes 10 communicate with the suction boat 12 of the rotary valve 11 .

Here, since the narrow groove 17A that communicates the groove 17 and the discharge boat 14 is formed on the surface of the rotary valve 11 that comes into sliding contact with the rotor 5, the groove 17 and the narrow groove 17A are formed at the same time when the rotary valve 11 is formed. Can be molded.

Therefore, the process of drilling an orifice, which is conventional, can be eliminated, and the processing cost of the rotary valve 11 can be reduced.

Next, FIGS. 3 and 4 are diagrams showing a second embodiment of the present invention.

3 and 4, a communication groove 15 is formed on the surface of the rotary valve 11 on the side that does not come into sliding contact with the rotor 5,
The communication groove 15 communicates with each discharge boat 14, respectively.

Further, a groove 17B is formed toward the outside of the valve body on the surface of the rotary valve 11 that does not come into sliding contact with the rotor 5.
A narrow groove 17C is formed which communicates the communication groove 7B with the communication groove 15.

The narrow groove 17C and the lid member 16 provided in close contact with the rotary valve 11 constitute an orifice as a flow resistance generating means.

In this embodiment as well, since the groove 17B and the narrow groove 17C can be molded with a mold at the same time when the rotary valve 11 is molded, the conventional hole machining process for forming an orifice can be eliminated, reducing costs. I can do it.

Next, FIGS. 5 to 7 are diagrams showing a third embodiment of the present invention.

The present invention is applied to a rotary valve having a structure in which an orifice is provided at each discharge port without providing a communication groove on the back surface of the rotary valve.

5 to 7, a groove 17D is formed on the surface of the rotary valve 11 corresponding to each discharge boat 14, and a narrow groove 1 is formed between each groove 17D and each discharge port 14.
7E are formed respectively.

Each narrow groove 17E and the rotor 5 in sliding contact with the rotary valve 11 constitute an orifice as a flow resistance generating means.

In this embodiment as well, the grooves 17D and the narrow grooves 17E can be formed by molding, and costs can be reduced.

[Effects of the Invention] As described above, according to the present invention, a narrow groove is formed on the contact surface of either the valve body or the partner member that comes into close contact with the valve body, and the narrow groove is formed in the contact surface of the valve body or the partner member that comes in close contact with the valve body. Since the orifice is defined by the valve body, the molding can be performed at the same time as molding the valve body or a mating member that comes into close contact with the valve body, so that costs can be reduced.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a first embodiment of the present invention, Figure 2 is a diagram showing a rotary valve, Figure 3 is a sectional view showing a second embodiment of the invention, and Figure 4 is a rotary valve. Figure 5 is a cross-sectional view showing a third embodiment of the present invention, Figure 6 is a view showing a rotary valve, Figure 7 is a perspective view of the rotary valve, and Figure 8 is a cross-sectional view showing a conventional example. . In the figure, l... cam, 2... cam surface, 4... cam housing, 5... rotor, 6... input shaft, 7... plunger chamber, 8... plunger 9... Turn spring, 10... Suction and discharge hole, 11... Rotary valve, 12... Suction port, 13... Suction path, 14... Discharge port, 15... Communication Groove, 16... Lid member, 17.17B, 17D... Groove, 17A, 17C, 17E... Thin groove, 18... Notch, 19... Protrusion, 0... Thrust block, DESCRIPTION OF SYMBOLS 1... Bearing, 2... Needle bearing, 3... Accumulator piston, 4... Retainer, 5... Return spring, 6... Oil seal, 7... Stop ring, 8...・Mounting hole, 9...Oil filling hole, 0...Bearing. Patent applicant: Fuji Iron Works Co., Ltd.

Claims (1)

[Scope of Claims] A cam housing provided between relatively rotatable input and output shafts, connected to the one shaft, and forming a cam surface having two or more ridges on the inner surface; a rotor that is coupled and rotatably housed in the cam housing to form a plurality of plunger chambers; and a rotor that is housed in each of the plurality of plunger chambers so as to be movable back and forth under the pressure of a return spring. a plurality of plungers driven by the cam surface during relative rotation of the two shafts; a suction and discharge hole formed in the rotor and communicating with the plunger chamber; and a valve body that is positioned in a predetermined relationship with the cam housing and has a plurality of suction ports and discharge ports formed on the sliding surface, which act as suction valves or discharge valves depending on the positional relationship with the suction and discharge holes. and a means for generating flow resistance by the flow of discharged oil due to the drive of the plunger, and a hydraulic power transmission joint that transmits torque according to a rotational speed difference between the two shafts, the valve body or the valve body A narrow groove is formed in the close contact or sliding contact surface of any of the members that come into close or sliding contact with the other member, and an orifice serving as the flow resistance generating means is defined by the other member that comes into close contact or sliding contact with the other member and the narrow groove. Features a hydraulic power transmission joint.