JPH04109490U - vane pump - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts related to holding a coil spring for biasing a vane and to facilitate assembly work related to holding the coil spring. [Structure] Vanes 30a are slidably inserted into a plurality of storage grooves 30b, 30b,... formed on the circumferential surface of the rotor body 30, respectively.
and the coil spring interposed between the bottom of the storage groove 30b.
30c, the insertion portion 53 is inserted into the holding rod insertion hole 30e formed at the bottom of the storage groove 30b, and the insertion portion 53 is inserted into the holding rod insertion hole 30e formed at the bottom of the storage groove 30b. The coil spring is
Hold 30c externally.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a vane pump, and more specifically, a vane pump is installed on the inner peripheral surface of a cam ring. A coil spring is inserted between each vane and the bottom of each storage groove to press the This invention relates to a vane pump equipped with a rotor.

0002

[Conventional technology]

As is well known, the vane pump rotor has a cylindrical main body with a deep radial direction. Multiple storage grooves are arranged horizontally and are spaced equally in the circumferential direction, extending over the entire length in the axial direction. A rectangular flat vane is slidably inserted into each of these storage grooves. . A vane pump has a casing equipped with a cam ring having a cylindrical shape with uneven thickness. The outer circumference of the rotor body and the cam ring are The space formed between the inner periphery acts as a pump chamber, and the pump The oil introduced into the pump chamber is sealed between two adjacent vanes, and the oil is sealed between two vanes that are adjacent to each other. The pressure is increased by being rotated along with the rotation. Therefore, in a vane pump ensures that each vane of the rotor is firmly pressed against the inner circumferential surface of the cam ring and that the seal is It is important to ensure that there is a gap between each vane and the bottom of the respective storage groove. A biasing means for biasing this radially outward is provided, and as the biasing means, the Ile springs are commonly used.

0003 Figure 5 is an enlarged view of the main parts of a conventional vane pump showing the state in which the vane biasing coil spring is installed. It is a large sectional view. In the figure, 30 is a cylindrical rotor body, which has a cylindrical shape with uneven thickness. It is coaxially fitted inside the cam ring 31 forming the cam ring 31. As mentioned above, the rotor body 30 has , multiple storage grooves 30b, 30b... (only one is shown in Figure 5), and each storage groove A rectangular flat vane 30a is slidably inserted into the storage groove 30b. There is. Coil springs 30c that bias the vanes 30a are located on both sides of each vane 30a in the width direction. These are provided with one end in the longitudinal direction locked at the bottom of the storage groove 30b, or The other end of the vane 30a is engaged with a notch 30d formed at the base of the vane 30a. It is interposed between the horn 30a and the storage groove 30b.

0004 The coil spring 30c is held by a spring holder 6 installed upright at the bottom of the storage groove 30b. It is now possible to do so. The spring holder 6 is supported at the bottom of the storage groove 30b. A support plate 60 for holding the coil spring 30c and a holding rod 61 for holding the coil spring 30c are provided. Ru. The support plate 60 is made of a narrow and thin plate material, and both ends of the support plate 60 in the longitudinal direction are , are bent on the same side in the thickness direction as shown in the figure, and the rotor body 30 is sandwiched as described later. Clamping portions 60a, 60a are formed to hold it. The tips of the clamping parts 60a, 60a are located at the bends. It is bent slightly in the opposite direction to provide a guiding effect during the clamping process. Further, in the longitudinal center portion of the support plate 60, a through hole ( (not shown) is formed. On the other hand, the holding rod 61 has one end formed into a hemispherical shape. It is a round bar, and on the other side, there is a diameter-reducing part that decreases in diameter toward the end, and the diameter-reduced part A small diameter portion is formed that continues to the end portion.

[0005] The spring holder 6 connects the small diameter part of the holding rod 61 to the surface of the support plate 60 (the clamping part) in the through hole. 60a, 60a from the side opposite to the protruding side), and the protruding end of this is inserted into the support plate 60. By caulking from the back side, the support plate 60 and the retaining rod 61 are held together so that the latter is approximately perpendicular to the former. They are integrally constructed in a manner that they are erected at a corner. let this hold As shown in the diagram, the coil spring 30c has a seat part on one side in the axial direction that has a slightly smaller diameter than the other part. The holding rod 61 is inserted through the small diameter seat side from the small diameter seat side. By fitting the seat portion into the reduced diameter portion of the holding rod 61, it is securely held by the holding rod 61. The coil spring 30c falls off from the holding rod 61 after the insertion. There is no danger.

[0006] The spring holder 6 is attached to the rotor body with the coil spring 30c held by the holding rod 61. Storage groove 30 is attached to the bottom of 30b. This installation is done from the support plate 60 side to the storage groove 30b. The clamping portions 60a, 60a on both sides of the support plate 60 hold the rotor body 30 on both sides. It is fixed to the bottom of the storage groove 30b by pinching the bottoms of the annular grooves 46, 46. . As a result, the holding rod 61 and the coil spring 30c attached thereto are placed in the storage groove 30b. radially outwardly along the The spring holder 6 is made of highly elastic material such as spring steel. The gripping portions 60a, 60a are made of a material having sufficient elasticity. Therefore, the spring holder 6 is inserted into the storage groove 30b as described above, and the holding parts 60a, 60a... After touching the tip to the bottom of the storage groove 30b, push it lightly to secure it. The parts 60a, 60a are expanded, and the rotor body 30 can be held between them. .

[0007]

[Problem that the idea aims to solve]

However, in the vane pump equipped with the spring holder 6 as described above, the coil spring 30 The problem is that there are a large number of parts to hold the c, and the assembly process is difficult. Therefore, the work of attaching the spring holder 6 to the bottom of the storage groove 30b of the rotor body 30 requires a lot of man-hours. There were many difficult problems.

[0008] The present invention was made in view of such circumstances, and is a coil spring for biasing the vane. Reduces the number of parts associated with retaining the coil spring and assembly work associated with retaining the coil spring. The purpose is to provide a vane pump that facilitates.

[0009]

[Means to solve the problem]

The vane pump according to the present invention has a plurality of storage grooves formed on the circumferential surface of the cylindrical body. , the slidably inserted vane is inserted between the coil spring and the bottom of the storage groove. In a vane pump equipped with a rotor that is biased radially outward by a One end of the coil spring is inserted into a hole formed at the bottom of the storage groove, and the coil spring is removed. It is characterized by comprising a holding rod erected at the bottom of the storage groove for fitting and holding.

0010

[Effect]

In the present invention, one end thereof is inserted into a hole formed at the bottom of the storage groove. As a result, the holding rod that holds the coil spring is placed upright at the bottom of the storage groove. , the coil spring is held only by this holding rod. Also, related to coil spring retention. The assembly work can be performed only by the work related to erecting the holding rod.

[0011]

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. Figure 1 is related to the present invention. A longitudinal section showing the main parts of a drive coupling device for a four-wheel drive vehicle configured using a vane pump 2 is an enlarged front sectional view taken along line II--II in FIG. 1.

0012 The drive coupling device shown in Figures 1 and 2 connects the drive from the front wheels to the rear wheels or from the rear wheels to the front wheels. Power is transmitted according to the difference in rotational speed that occurs between the front and rear wheels. A rotor whose rotation is restrained by an input shaft 1 that rotates in conjunction with one of the wheels, and a rotor that rotates in conjunction with the other. A vane pump 3 comprising an output shaft 2 and a casing whose rotation is restricted. The oil tank T that stores the hydraulic oil, and the suction oil path and discharge of the vane pump 3. The oil passage is integrally constructed. This drive coupling device forwards the driving force from the engine. In 4-wheel drive vehicles that transmit power directly to the two wheels, the front and rear wheels are connected to each other. It is used by being attached to the middle of the propeller shaft. In this case, input shaft 1 is attached to the propeller shaft. This corresponds to the front wheel side part of the foot, and the output shaft 2 similarly corresponds to the rear wheel side part.

[0013] The casing of the vane pump 3 includes a cam ring 31 having a cylindrical shape with uneven thickness, and a cam ring 31 having a cylindrical shape with uneven thickness. The ring 31 is held between both sides in the axial direction, and a side plate 32 in the form of a hollow disc and a thick wall are installed. The side plate 33 has a hollow disc shape, and the cam ring 31 of the side plate 32. A cylindrical shaft seal member 34 whose flange is fixed on the opposite side is connected to a flange portion of the shaft seal member 34, Penetrate the side plate 32 and cam ring 31 in this order and form the side plate 33. A plurality of fixing bolts 35, 35... which are screwed into separate screw holes formed in the It is structured in a physical manner. This casing is formed at the end of the output shaft 2. Attach the connecting flange 20 to the outside of the side plate 33 using multiple fixing bolts 21, 21... By fixing it to the side surface, it is coaxially connected to the output shaft 2. It rotates around its axis in conjunction with the rotation of. There is also a size on the outside of the casing. A part of it is fitted onto the outer circumferential surface of the door plate 33 and the outer circumferential surface of the shaft sealing member 34, and as shown in FIG. As shown, in a manner surrounding the outside of the cam ring 31 and the side plates 32, 33, A thin-walled cylindrical surrounding member 38 is fitted, and the hydraulic oil of the vane pump 3 is supplied to the surrounding member 38. The oil tank T is sealed in an annular shape between the inner periphery of the casing and the outer periphery of the casing. is included.

[0014] On the other hand, the rotor of the vane pump 3 has a plurality of rotors in the rotor body 30 which has a short cylindrical shape. flat plate-shaped vanes 30a, 30a... are mounted so as to be slidable in the radial direction as described later. It is configured. The rotor shaft 36, which is the rotation axis of the rotor 3, is a hollow part of the side plate 32. The needle roller bearing 32a is fitted and fixed in the hollow part of the side plate 33, and the needle roller bearing 32a is fitted in the hollow part of the side plate 33. It is supported by a fixed ball bearing 33a and is located on the axis of the casing. The rotor body 30 is externally fitted onto the rotor shaft 36 between the two supporting positions, and is connected to the rotor shaft 36 by a spline connection. It has been combined. The inner circumference of the cam ring 31 is slightly larger than the outer circumference of the rotor body 30. A plurality of recesses (three in this example) are formed approximately equally spaced in a circle with a diameter, It has a shaft cross-sectional shape as shown in FIG. 2, and is attached to the rotor shaft 36 as described above. The motor main body 30 is mounted on a cam ring with both sides sandwiched between side plates 32 and 33. between the outer peripheral surface of the rotor body 30 and the inner peripheral surface of the cam ring 31. The formation position of the recording recess is surrounded by both sides and the side surfaces of the side plates 32 and 33, and is deformed. Pump chambers 40, 40, 40 having a crescent-shaped shaft cross section are formed.

[0015] The rotor shaft 36 includes an oil seal 34a and an X-ring which are fitted and fixed to the shaft sealing member 34. The outer periphery of the shaft sealing member 34b is sealed, and the shaft sealing member 34 is protruded by an appropriate length. A connecting flange 37 formed at the protruding end of the input shaft 1 connects to the connecting flange 37 formed at the end of the input shaft 1. It is coaxially fixed to the connecting flange 10 by a plurality of fixing bolts 11, 11, . . . . That is, the rotor of the vane pump 3 is connected via the rotor shaft 36 and the connecting flanges 37, 10. , is coaxially connected to the input shaft 1, and the casing rotates in conjunction with the rotation of the input shaft 1. rotates inside the ring. Therefore, there is a rotational speed difference between input shaft 1 and output shaft 2. If this occurs, there is a gap between the rotor that works with the former and the casing that works with the latter. Relative rotation occurs at a speed corresponding to the rotational speed difference.

[0016] The rotor body 30 has a plurality of storage grooves having a predetermined depth radially inward. 30b, 30b... are equally distributed in the circumferential direction and are formed over the entire length in the axial direction, and each storage In the groove 30b, the vane 30a, which has a rectangular flat plate shape, is installed along the wall surface of the storage groove 30b. It is inserted so that it can slide freely. Between the bottom of the storage groove 30b and the base of the vane 30a, A coil spring 30c is interposed, and the vane 30a is provided with a coil spring 30c. Due to the urging force of An outward pressing force is applied in the radial direction of the rotor body 30.

[0017] Next, the configuration of the suction oil passage and the discharge oil passage of the vane pump 3 will be explained. pump room 40, 40, and 40 each have an opening on the side plate 32 side located at both ends in the circumferential direction. a pair of suction ports 40a, 40a, and a pair of discharge holes 40b, which open on the side plate 33 side. 40b are formed as shown in FIG. As shown in Figure 1, each suction port 40a has a A suction check valve 41 that is attached to the door plate 32 and only allows flow into the pump chamber 40. and align it with the installation position of this, and penetrate the flange part of the shaft sealing member 34 in the axial length direction. The oil tank T is connected to the oil tank T through a suction hole 42 formed therein.

[0018] In addition, each discharge port 40b is folded inward in the radial direction in a dogleg shape. One end of a discharge hole 44 formed in the side plate 33 is opened, and the discharge hole 44, and a discharge check installed in the middle of this to allow only outflow from the pump chamber 40 Each vane 30a, 30a...respective storage groove 30b, 30b is installed on the side surface of the rotor body 30 via the valve 45. ... are communicated with an annular groove 46 formed in such a manner that they communicate with each other.

[0019] Additionally, this annular groove 46 is formed between both sides of the rotor body 30 and the side plates 32, 33. It communicates with the hollow part of the side plates 32, 33 through a slight gap between the side plates 32 and 33. Furthermore, these hollow portions have a return hole 47 passing through the shaft sealing member 34 in the radial direction, or The return hole 48 that passes through the side plate 33 in the radial direction allows the It is connected to the oil storage tank T. That is, the suction oil passage of the vane pump 3 is It is composed of a hole 42 and a suction check valve 41, and a discharge oil passage is connected to the discharge hole 44. , the discharge check valve 45 in the middle of this, the bottom of the storage grooves 30b, 30b..., the rotor body 30 It is composed of gaps on both sides and the return oil passages 47, 48.

[0020] In the drive coupling device equipped with the vane pump 3 configured as described above, the When driving, accelerating or decelerating, or when one of the front and rear wheels is idling, When driving in a state where there is a difference in rotational speed between the The rotor is connected between the rotor and the casing that rotates in conjunction with the rear wheel via the output shaft 2. Relative rotation occurs at a speed corresponding to the rolling speed difference. When relative rotation occurs in this way, In this case, the oil in the oil tank T passes through the suction hole 42 and the suction check valve 41 in the relative rotation direction. It is introduced into each pump chamber 40 from the suction port 40a located on the upstream side. This introduced oil is It is sealed between adjacent vanes 30a and 30a, and rotates as the rotor body 30 rotates. The pressure increases and hydraulic pressure is generated inside each pump chamber 40. This generated oil pressure is the rotor main A structure is formed between the outer peripheral surface of the body 30 and the inner wall surface of the pump chamber 40 in a direction to suppress the relative rotation. between the rotor and the casing, that is, between the input shaft 1 and the output shaft 2. The driving force is transmitted to.

[0021] To explain in more detail the process of increasing the pressure inside the pump chamber 40, the adjacent vanes 30a, 30 A part of the oil sealed between the vanes 30a and 30b is deposited in the thickness direction near the tip of the vane The low pressure side (relative rotation) (in the upstream direction) and is compressed again, while the remainder is located downstream in the relative rotation direction. The discharge port 40b located at the 45 and an annular groove 46, and are introduced into the bottoms of the storage grooves 30b, 30b.... This pressure oil is While applying a radially outward pressing force to the vanes 30a inserted into each storage groove 30b, , through the gaps on both sides of the rotor body 30, leaking into the hollow parts of the side plates 32, 33. After lubricating the needle roller bearing 32a and the ball bearing 33a, the water flows through the return holes 47 and 48. The oil is then refluxed to the oil tank T.

[0022] The oil pressure in each pump chamber 40 is mainly applied between the throttle hole 39 and both sides of the rotor body 30. It occurs against the flow resistance in the gap, and the magnitude of this flow resistance depends on the flow through these. Furthermore, the amount of oil depends on the phase between the rotor and the casing. Corresponds to the magnitude of rotational speed. Therefore, the level of hydraulic pressure generated inside the pump chamber 40 is the rotational speed difference between the input shaft 1 and the output shaft 2, in other words, the rotational speed between the front and rear wheels. This corresponds to the magnitude of the difference in speed, and the driving force corresponding to the difference in rotational speed is applied to the front two wheels. The power is then distributed to the rear two wheels, achieving four-wheel drive.

[0023] The drive coupling device equipped with the vane pump 3 operates as described above, and its driving force is Since the transmission characteristic of depends on the oil pressure generation characteristic of the vane pump 3, Reliable hydraulic pressure generation in each pump chamber 40 depending on relative rotation with the casing is required. The hydraulic pressure generation behavior inside the pump chamber 40 is as described above, and is confirmed with certainty. In order to generate actual hydraulic pressure, the vanes 30a, 30a... to achieve high sealing performance between adjacent vanes 30a and 30a. is important. As mentioned above, the pressing force of the vane 30a is the same as that of the storage groove 30b. The biasing force of the coil spring 30c interposed between the bottom part and the storage groove through the discharge hole 44 This is the hydraulic pressure introduced in 30b. However, the latter has a pump chamber at the tip of vane 30a. 40 cancels out the hydraulic pressure acting inside, so the quality of the sealing performance is determined by the former. That is, it mainly depends on the quality of the biasing state of the coil spring 30c. Therefore, carp The base spring 30c is installed correctly, and the expansion and contraction of these springs is not hindered. It is necessary to reliably press the pins 30a, 30a...

[0024] The vane pump 3 according to the present invention has the coil spring 30c installed correctly and the vane 30a, 30a... and reduce the number of parts related to holding the coil spring 30c. A coil spring 30c is stored in order to reduce the labor required for assembly work. A holding rod 5 is provided for holding at the bottom of the groove 30b.

[0025] Figure 3 shows the main parts of the holding rod 5 and coil spring 30c, which are the features of the present invention, shown in their attached state. It is an enlarged sectional view. The holding rod 5 is a round rod with one end formed into a hemispherical shape. , on the other side thereof, there is a diameter-reducing portion 51 that decreases in diameter toward the other end, and a diameter-reducing portion 51 that continues to the end of the diameter-reducing portion. A flange portion 52 and a cylindrical insertion portion 53 connected to the flange portion 52 are formed. . Also, at the bottom of the storage groove 30b of the rotor body 30, there is a part that is approximately the same as the insertion part 53 of the holding rod 5. A holding rod insertion hole 30e having a diameter and deeper than the length of the small diameter portion 53 is formed. Retention The small diameter portion 53 of the rod 5 is inserted into the holding rod insertion hole 30e, so that the rod 5 is inserted into the rotor main body. It is arranged upright at the bottom of the storage groove 30b of the body 30. In this case, the flange 52 is in contact with the bottom of the storage groove 30b, and the holding rod 5 is erected in a stable state. That will happen.

[0026] In addition, the coil spring 30c has a shape in which one end is reduced in diameter toward the axial end. , when inserting the holding rod 5 into the holding rod insertion hole 30e during assembly, the coil spring 30c is , is inserted into the holding rod 5 from the reduced diameter end side, and the reduced diameter end is inserted into the flange portion 52. It is pre-wound around the holding rod 5 in an abutting manner, and in this state, the holding rod 5 is inserted into the holding rod insertion hole. Inserted in 30e. The coil spring 30c is compressed on the outside of the reduced diameter portion 51 of the holding rod 5. Like the diameter portion 51, its diameter is reduced, so the notch 3 of the vane 30a The biasing force of the coil spring 30c when installed at 0d is always applied to the flange portion 52. Therefore, the holding rod 5 is prevented from coming off from the holding rod insertion hole 30e.

[0027] Next, other embodiments of the holding rod 5 will be described. Figure 4 shows other parts of the holding rod 5. FIG. 2 is an enlarged cross-sectional view of a main part showing an embodiment of the present invention. In addition, in Fig. 4, what corresponds to Fig. 3 are given the same numbers and their explanations will be omitted. The holding rod 5 shown in FIG. 4 has one end shaped like a hemisphere. It is a round bar formed into a shape, and on the other side, there is a diameter-reducing part 51 that decreases in diameter toward the other end. and a barrel-shaped insertion portion 53 that continues to the end of the reduced diameter portion 51. in this way The structured holding rod 5 is inserted into the holding rod insertion hole 30e, and thereby the rotor body is inserted into the holding rod insertion hole 30e. It is designed to be erected at the bottom of the 30 storage grooves 30b. In this way, the In the holding rod 5, since the insertion portion 53 is barrel-shaped, alignment occurs when the vane pump 3 is operated. The force acts to prevent the spring holding rod 5 from tilting.

[0028] In this way, the holding rod 5 is fixed by inserting its insertion portion 53 into the holding rod insertion hole 30e. It is easy and reliable to hold the coil spring 30c with only the holding rod 5. The number of parts related to holding the coil spring 30c is reduced compared to conventional methods. The assembly man-hours associated with holding the coil spring 30c are significantly reduced. Assembly operations associated with retaining spring 30c are facilitated. Also, the holding rod 5 is a round rod. Since it has a circular cross section, it holds when the coil spring 30c expands and contracts. There is no risk of being obstructed by the rod 5, and the vane 30a can be pressed reliably.

[0029] In addition, in this example, a vane pump used in a drive coupling device for a four-wheel drive vehicle is used. However, it goes without saying that the application of the present invention is not limited to this. stomach.

[0030]

[Effect of the idea]

As detailed above, in the vane pump according to the present invention, one end of the vane pump has a storage groove. By inserting the coil spring into the hole formed at the bottom of the The holding rod that should be held is placed upright at the bottom of the storage groove, so the coil can be held using only this holding rod. The spring can be held, and the maintenance of the coil spring can be done simply by erecting the holding rod. The number of parts involved in retaining the coil spring can be reduced because the assembly work associated with retaining the coil spring can be performed. The present invention has advantages, such as reducing the number of coil springs and simplifying the assembly work related to holding the coil spring. It has a great effect.

[Brief explanation of drawings]

[Fig. 1] 4 constructed using the vane pump according to the present invention
1 is a longitudinal sectional view of a drive coupling device for a wheel drive vehicle; FIG.

FIG. 2 is an enlarged cross-sectional view taken along line II-II in FIG. 1;

FIG. 3 is an enlarged cross-sectional view of main parts showing a state in which a holding rod and a coil spring, which are the features of the present invention, are attached.

FIG. 4 is an enlarged sectional view of a main part showing another embodiment of the holding rod.

FIG. 5 is an enlarged sectional view of main parts of a conventional vane pump.

[Explanation of symbols]

3 Vane pump 5 Holding rod 30 Rotor body 30a vane 30b storage groove 30c coil spring 30e Holding rod insertion hole 53 Insertion part

Claims (1)

[Scope of utility model registration request] Claim 1: A vane slidably inserted into each of a plurality of storage grooves formed on the circumferential surface of a cylindrical body is moved outward in the radial direction by a coil spring interposed between the vane and the bottom of the storage groove. In a vane pump equipped with a rotor that is biased in one direction,
A vane pump comprising a holding rod, one end of which is inserted into a hole formed at the bottom of the storage groove, and is erected at the bottom of the storage groove to externally fit and hold the coil spring.