Refuse collection vehicle

Abstract

We provide garbage collection vehicles that operate with low noise levels. [Solution] The refuse collection vehicle 1 is composed of a vehicle body 2 and a refuse collection device 10 mounted on the vehicle body 2. The refuse collection device 1 has a refuse storage box 202 for storing refuse, a loading device 207 for introducing refuse into the refuse storage box, a hydraulic actuator for driving any of the devices, and a hydraulic pump 20 for supplying hydraulic fluid to the hydraulic actuator. The hydraulic pump is a gear pump in which a pair of gear-shaped rotating members are provided inside a casing, and hydraulic fluid is sealed and delivered in the space formed between the inner wall of the casing and the grooves of the teeth of the gear-shaped rotating members, and the gear pump has a structure in which the teeth of opposing gear-shaped rotating members contact at one point during rotation.

Description

Technical Field

[0001] The present invention relates to a garbage collection vehicle for collecting and transporting garbage.

Background Art

[0002] As a device for collecting general garbage discharged from households and raw garbage discharged from restaurants and the like, a garbage collection vehicle 200 is known. The garbage collection vehicle 200 is one in which a garbage collection device 201 is mounted on a truck vehicle (vehicle body) 2 as shown in Fig. 9(a). The garbage collection device 201 is composed of a garbage storage box 202 for storing garbage and a garbage input box 203. The garbage storage box 202 is a box with a garbage discharge port 208 opened on the rear end side of the truck vehicle 2 as shown in Fig. 9(b), and the other garbage input box 203 is located at a position covering the opening part (garbage discharge port 208) of the garbage storage box 202. That is, the garbage input box 203 covers the garbage storage box 202 as shown in Figs. 9(a) and (b), and a substantially sealed garbage storage space 205 is formed by the garbage storage box 202 and the garbage input box 203. And the garbage input box 203 has a garbage input space 206 into which garbage is input as shown in Fig. 10, and a loading device 207 for pushing the garbage input into the garbage input space 206 into the garbage storage space 205 in the garbage storage box 202 is built in.

[0003] One of the loading devices 207 has a structure called a rotary plate type loading device. The rotary plate type loading device 207 has a structure in which a swing type push-in plate 210 and a rotary plate 213 are combined as shown in Fig. 10. That is, in the rotary plate type loading device 207, the rotary plate 213 is in the garbage input space 206. The rotary plate 213 rotates around a horizontal axis 215. The push-in plate 210 is provided at the upper part of the rotary plate 213 and on the rear end side of the garbage input box 203. The push-in plate 210 swings in the front-rear direction of the truck vehicle 2 around a horizontal axis 218.

[0004] In the rotary plate loading device 207, the rotary plate 213 is rotated as shown in Figure 10(a), which scoops up the rubbish 220 that has been introduced into the rubbish input space 206 to a certain height as shown in Figure 10(b). Then, the pushing plate 210 is oscillated as shown in Figure 10(c), and the tip of the pushing plate 210 wipes the surface of the rotary plate 213, pushing the rubbish 220 into the rubbish storage space 205 inside the rubbish storage box 202.

[0005] As shown in Figure 9, the waste input box 203 is attached to the waste storage box 202 via a hinge 230. An opening / closing cylinder 231 is also installed between the waste input box 203 and the waste storage box 202. As shown in Figure 9, the refuse collection vehicle 200 can open and close the refuse discharge port 208 at one end of the refuse storage box 202 by swinging the refuse input box 203 by extending and retracting the opening and closing cylinder 231.

[0006] When discharging waste from the waste container 202, the waste discharge port 208 is left open, and the waste container 202 is tilted overall around the hinge 222.

[0007] In the 200 model garbage truck, each piece of equipment is driven using a hydraulic actuator. That is, the loading device 207 has a pushing plate 210 and a rotating plate 213 as described above. The pushing plate 210 of the loading device 207 is driven by a pushing cylinder 221 as a hydraulic actuator. The rotating plate 213 is driven by a hydraulic motor (not shown) as a hydraulic actuator. The refuse input box 203 is opened and closed by extending and retracting an opening / closing cylinder 231. The refuse input box 203 is tilted by a dump cylinder (not shown).

[0008] Furthermore, each hydraulic actuator is supplied with hydraulic fluid from a hydraulic pump. The hydraulic pump used in the conventional refuse collection vehicle 200 is a gear pump using involute gears, with a meshing ratio of 1.25 or higher. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2023-49621 [Patent Document 1] Japanese Utility Model Publication No. 62-136403 [Overview of the project] [Problems that the invention aims to solve]

[0010] Garbage collection truck 200 is often used to collect garbage around private homes. Garbage collection is also sometimes carried out at night. Therefore, there is a need for the development of garbage collection vehicles that produce less noise. The present invention aims to meet this requirement and provides a garbage collection vehicle that is quiet and produces little noise during operation. [Means for solving the problem]

[0011] An embodiment for solving the above-mentioned problems is a refuse collection vehicle comprising a vehicle body and a refuse collection device mounted on the vehicle body, wherein the refuse collection device includes a refuse storage box for storing refuse, a loading device for introducing refuse into the refuse storage box, a hydraulic actuator for driving any of the devices, and a hydraulic pump for supplying hydraulic fluid to the hydraulic actuator. The aforementioned hydraulic pump is characterized by being of one of the following types in the refuse collection vehicle. (1) A gear pump in which a pair of gear-shaped rotating members are provided inside a casing, and hydraulic fluid is sealed and delivered into the space formed between the inner wall of the casing and the grooves of the teeth of the gear-shaped rotating members, wherein the teeth of opposing gear-shaped rotating members make contact at one point during rotation. (2) Vane pump.

[0012] The inventors investigated the source of the noise emitted by garbage collection vehicles. As a result, we determined that the hydraulic pump driving the hydraulic actuator was one of the sound sources. The conventional hydraulic pump used is a gear pump 100 that utilizes involute gears 101 and 102, as shown in Figure 12. The gear pump 100 has a pair of involute gears 101 and 102 built into a casing 105. As the internal involute gears 101 and 102 rotate, the space 106 formed by the inner surface of the casing 105 and the grooves between the involute gears 101 and 102 moves. The gear pump 100 has an inlet 107 and a discharge port 108 in the casing 105. The hydraulic fluid 103 introduced from the inlet 107 is sealed in the space 106 formed by the inner surface of the casing 105 and the grooves between the gears 101 and 102, and the rotation of the involute gears 101 and 102 moves the hydraulic fluid 103 to the discharge port 108. However, in the gear pump 100 that utilizes involute gears 101 and 102, hydraulic fluid 103 enters the meshing portion of the two gears 101 and 102 at the discharge port 108. The hydraulic fluid that enters the meshing portion 110 of the two gears is returned to the inlet 107, but noise is generated at this time. In other words, as shown in Figure 13, the space created at the meshing portion 110 of the two gears 101 and 102 is a closed space 112, and the hydraulic fluid is trapped in the closed space 112 created at the meshing portion 110 of the two gears 101 and 102. Here, the volume of the closed space 112 created at the meshing portion 110 of the two gears 101 and 102 decreases when the involute gears 101 and 102 rotate. As a result, the hydraulic fluid trapped in the meshing portion 110 of the two involute gears 101 and 102 is compressed and leaks through a tiny gap. And at that time, noise is generated. In contrast, one of the hydraulic pumps employed in this invention is a gear pump in which the teeth of opposing gear-shaped rotating members contact at a single point during rotation. Because this hydraulic pump has a structure in which the teeth of the gear-shaped rotating members contact at a single point during rotation, no enclosed space is created between the gear-shaped rotating members. Therefore, hydraulic fluid is not trapped, and no leak noise is generated. Regarding vane pumps, there is no trapping of hydraulic fluid, and therefore no leak noise is produced.

[0013] Another aspect for solving the same problem is a dust collection vehicle composed of a vehicle body and a dust collection device mounted on the vehicle body. The dust collection device includes a dust storage box for storing dust, a loading device for introducing dust into the dust storage box, a hydraulic actuator for driving any device, and a hydraulic pump for supplying hydraulic oil to the hydraulic actuator. The hydraulic pump is a gear pump having a gear pair with a meshing ratio of 1 or less. The dust collection vehicle is characterized by this.

[0014] The hydraulic pump adopted in the present invention is a gear pump having a gear pair with a meshing ratio of 1 or less. Since the meshing ratio of the hydraulic pump adopted in the present invention is 1 or less, the meshing teeth are less than one tooth. Therefore, the confinement of hydraulic oil does not occur, and no leakage sound occurs.

[0015] In each of the above aspects, it is desirable that an elastic piping member is connected to the discharge side of the hydraulic pump.

[0016] According to this aspect, the vibration of the hydraulic pump is absorbed by the elastic piping member and is difficult to propagate to other parts. Therefore, the noise caused by the vibration is suppressed.

[0017] In each of the above aspects, it is desirable to have a case that covers the periphery of the hydraulic pump.

[0018] According to this aspect, the sound emitted by the hydraulic pump is blocked by the case and is difficult to spread.

[0019] In each of the above aspects, it is desirable that the hydraulic pump is a gear pump provided with a herringbone gear or a double helical gear.

[0020] According to this aspect, the sound emitted by the hydraulic pump can be further reduced.

Effect of the Invention

[0021] The dust collection vehicle of the present invention makes little noise during operation and is relatively quiet. [Brief explanation of the drawing]

[0022] [Figure 1] This is a side view of a refuse collection vehicle according to an embodiment of the present invention, with the main parts indicated by solid lines. [Figure 2] Figure 1 is an exploded perspective view of the refuse collection vehicle. [Figure 3] (a) is a perspective view of the area around the hydraulic pump of the refuse collection vehicle in Figure 1, including the soundproof case, as seen from the cabin side, and (b) is a perspective view of the same area as seen from the opposite side. [Figure 4] (a) is a perspective view of the area around the hydraulic pump of the refuse collection vehicle in Figure 1, observed from the cabin side, excluding the soundproof case, and (b) is a perspective view of the same area observed from the opposite side. [Figure 5] (a) is a perspective view of the soundproof case observed from the rear of the vehicle, and (b) is a perspective view of the soundproof case observed from the front of the vehicle. [Figure 6] This is a cross-sectional view of a hydraulic pump. [Figure 7] (a) is a modified example of the area around the hydraulic pump of a refuse collection vehicle, a perspective view observed from the rear of the vehicle including the soundproof case, and (b) is an exploded perspective view of the soundproof case. [Figure 8] This is a perspective view showing an example of a mounting section for a hydraulic pump. [Figure 9] These are side views of the conventional and the present invention's refuse collection vehicle, where (a) shows the refuse discharge port of the refuse container box blocked by the refuse input box, and (b) shows the refuse input box being swung to open the refuse discharge port of the refuse container box. [Figure 10] These are cross-sectional views of the main parts around the wall plate, pushing plate and rotating plate of the conventional and present invention refuse collection vehicles, where (a) shows the rotating plate in a ready position and the lower end of the pushing plate retracted to the rear end, (b) shows the rotating plate rotating to scoop up refuse and the lower end of the pushing plate retracted to the rear end, and (c) shows the lower end of the pushing plate moving forward to push the refuse into the refuse collection box. [Figure 11]These are cross-sectional views of the main parts around the slide plate and push plate of the conventional and present invention refuse collection vehicles, where (a) shows the slide plate in the lowered position, (b) shows the slide plate inserted into the refuse input space and the push plate rotated to scoop up the refuse, and (c) shows the slide plate raised and the refuse pushed towards the refuse storage box. [Figure 12] (a) to (c) are cross-sectional views illustrating the operating principle of a hydraulic pump used in a conventional refuse collection vehicle. [Figure 13] This is an explanatory diagram showing the meshing of gears within the casing of a hydraulic pump used in conventional refuse collection vehicles. [Modes for carrying out the invention]

[0023] Embodiments of the present invention will be described below. The invention as described in the claims is not limited to the embodiments described below. As shown in Figures 1 and 2, the refuse collection vehicle 1 of this embodiment is a truck vehicle (body) 2 with a refuse collection device 10 mounted on it.

[0024] The truck vehicle (body) 2 and the rubbish collection device 10 are well-known and will be briefly described.

[0025] As shown in Figures 1 and 2, the truck vehicle 2 has a cabin section 5 and a frame section 6, similar to known vehicles, and has running wheels 7, which rotate to propel itself. As shown in Figures 1 and 2, the truck vehicle 2 is equipped with a frame 8. The frame 8 is also called the main frame or chassis frame. As shown in Figure 2, the frame 8 has a pair of parallel vertical members 11a and 11b. The vertical members 11a and 11b each extend in the front-rear direction of the truck vehicle (body) 2.

[0026] Next, we will describe the waste collection device 10. As shown in Figure 2, the waste collection device 10 consists of a main unit 15 that performs the function of collecting waste and the like, and a deck frame 16.

[0027] The main unit 15 is the same as that of the prior art described in Figures 9 and 10, and consists of a waste collection box 202 for collecting waste and a waste input box 203, as shown in Figures 1 and 2. The structure of the main unit 15 is the same as that described in the section on the prior art, and has the equipment shown in Figures 9 and 10. It should be noted that in the refuse collection vehicle 1, each piece of equipment is driven using hydraulic actuators. Specifically, the loading device 207 has a pushing plate 210 and a rotating plate 213 as described above. The pushing plate 210 of the loading device 207 is driven by a pushing cylinder 221 acting as a hydraulic actuator. The rotating plate 213 is driven by a hydraulic motor (not shown) acting as a hydraulic actuator. The refuse input box 203 is opened and closed by extending and retracting an opening / closing cylinder 231. The refuse input box 203 is tilted by a dump cylinder 225 (Figure 2).

[0028] In this embodiment, hydraulic fluid is supplied to each hydraulic actuator from the hydraulic pump 20. The hydraulic pump 20 used in this embodiment is called a segmental gear type pump, and as shown in Figure 6, the shape of the tip of the teeth is arc-shaped. That is, the hydraulic pump 20 has a pair of gear-shaped rotating members 22 and 23 provided inside the casing 21. The hydraulic pump 20 is a pump in which hydraulic fluid is sealed and delivered in the space 26 formed between the inner wall of the casing 21 and the grooves 25 between the teeth of the gear-shaped rotating members 22 and 23. In this embodiment, the hydraulic pump 20 has an arc shape at the tip of the teeth, and the teeth of opposing gear-shaped rotating members always contact at one point during rotation. As shown in Figure 6, in the hydraulic pump 20, no closed space is created between the gear-shaped rotating members 22 and 23. That is, in the hydraulic pump 20, the meshing portions of the gear-shaped rotating members 22 and 23 are always open spaces, formed by the groove 35 between teeth 32a and 32b of one gear-shaped rotating member 22 and the groove 36 between teeth 33a and 33b of the other gear-shaped rotating member 23. Therefore, hydraulic fluid trapping does not occur, and no leak noise is produced. The hydraulic pump 20 used in this embodiment is a gear pump having a gear pair with a meshing ratio of 1, in which the teeth of the gear-shaped rotating members 22 and 23 are always in contact at one point during rotation.

[0029] The meshing ratio is a value that represents the average number of gear teeth meshing together. The definition of the meshing ratio is the value obtained by dividing the length of the contact arc by the circular pitch in the meshing of a pair of gears. The meshing ratio is also called the contact ratio.

[0030] The external appearance of the hydraulic pump 20 and the shape of the peripheral equipment in this embodiment are as shown in Figures 3 and 4. As shown in Figures 3, 4, and 6, the hydraulic pump 20 of this embodiment has an inlet 30 at the top of the casing 21 and a discharge port 31 at the bottom. Also, on the side facing the cabin 5, there is a drive shaft connection part 37 as shown in Figure 4(a).

[0031] The hydraulic pump 20 is surrounded by a soundproof case 40, as shown in Figure 3. As shown in Figures 3 and 5, the soundproof case 40 is semi-box-shaped with a front wall 41 and left and right side walls 42 and 43, with the top and rear open. There is also a large slit 45 on the bottom. An opening 47 is provided in the front wall 41.

[0032] Next, the layout of the hydraulic equipment will be described. The hydraulic equipment consists of the aforementioned hydraulic pump 20, push cylinder (hydraulic actuator) 221, hydraulic motor (hydraulic actuator) (not shown), on-off cylinder (hydraulic actuator) 231, dump cylinder 225 (hydraulic actuator), as well as a hydraulic tank 38 and solenoid valves (not shown).

[0033] The hydraulic tank 38 is installed at the front end of the frame 6, as shown in Figures 1 and 2. In other words, the hydraulic tank 38 is installed between the cabin 5 and the refuse collection device 10. The hydraulic pump 20 is attached to the vertical member 11b of the truck vehicle 2, as shown in Figures 1 and 2. In this embodiment, a soundproof case 40 is suspended from the vertical member 11b of the truck vehicle 2 by a bracket 50 as shown in Figure 8, and a hydraulic pump 20 is supported by the soundproof case 40. That is, the hydraulic pump 20 is attached to the vertical member 11b of the truck vehicle 2 via the bracket 50 and the soundproof case 40.

[0034] The position of the hydraulic pump 20 is as shown in Figure 3, with the piping attached to the discharge port 31 exposed through the slit 45 of the soundproof case 40. Furthermore, the output shaft 51, which is branched from the engine of the vehicle body, is inserted through the opening 47 in the front wall 41 of the soundproof case 40 and connected to the drive shaft connection part 37. The inlet 30 of the hydraulic pump 20 is located on the exposed upper surface of the soundproof case 40.

[0035] The hydraulic tank 38 and the inlet 30 of the hydraulic pump 20 are connected by an inlet pipe 52. The inlet pipe 52 has an outlet section 53 that extends in the width direction of the truck vehicle 2 from the bottom of the hydraulic tank 38, a rear extension section 55 that extends parallel to the vertical member 11b of the truck vehicle 2, and an elbow section 56, the elbow section 56 of which is connected to the inlet 30 of the hydraulic pump 20. In this embodiment, as shown in Figure 8, an opening 71 is provided in the bracket 50, and the inlet pipe 52 is inserted through this opening 71.

[0036] In this embodiment, the discharge port 31 of the hydraulic pump 20 is connected to the rear of the truck vehicle 2 by an elbow member (not shown). In this embodiment, the discharge piping of the hydraulic pump 20 includes a first discharge pipe 60 that extends rearward along the longitudinal member 11b of the truck vehicle 2, and a riser pipe 61 connected to the first discharge pipe 60. The downstream side of the riser pipe 61 is branched by a manifold (not shown) and connected to each hydraulic actuator via a solenoid valve (not shown). There is also a return pipe (not shown), which connects a solenoid valve (not shown) and a hydraulic tank 38.

[0037] In this embodiment, the first discharge pipe 60 on the discharge side of the hydraulic pump 20 is made of a rubber hose. That is, in this embodiment, an elastic piping member is connected to the discharge side of the hydraulic pump 20, at a position immediately adjacent to the discharge port 31. In this embodiment, excluding connecting fittings such as elbow members, the piping material at the part closest to the discharge port 31 is a rubber hose and is elastic.

[0038] In this embodiment, the refuse collection vehicle 1, like those known, has hydraulic fluid pressurized by a hydraulic pump 20 supplied to each hydraulic actuator to perform predetermined operations. In this embodiment, the hydraulic pump 20 employs a segmental gear type pump, with a pair of gear-shaped rotating members 22 and 23 provided inside the casing 21. The shape of the tip of the teeth is arc-shaped, and the teeth of the opposing gear-shaped rotating members 22 and 23 always contact at one point during rotation, so no closed space is created between the gear-shaped rotating members 22 and 23. Therefore, the hydraulic pump 20 is quiet as no trapping of hydraulic fluid occurs and no leak noise is generated.

[0039] Furthermore, in the refuse collection vehicle 1 of this embodiment, an elastic piping member is connected to the discharge side of the hydraulic pump 20, at a position immediately adjacent to the discharge port 31. As a result, vibrations and noises generated by the hydraulic pump 20 are attenuated by the elasticity of the piping member and do not spread to the outside. Furthermore, in this embodiment of the refuse collection vehicle 1, the hydraulic pump 20 is covered by the wall of the soundproof case 40. Therefore, the sound emitted by the hydraulic pump 20 is less likely to spread outside. As described above, the garbage collection vehicle 1 of this embodiment is equipped with multiple soundproofing and noise-reducing measures, resulting in low noise and quiet operation.

[0040] The soundproof case 40 used in the embodiments described above covers three sides of the hydraulic pump 20, but it may cover more sides. For example, the soundproof case 40 described above does not have anything covering the top surface, but it may have a top wall. Also, the soundproof case 40 described above does not have anything covering the rear surface, but it may have a rear wall. For example, as shown in Figure 7, an auxiliary member 66 may be provided to the soundproof case 40, covering five sides of the hydraulic pump 20, as in the soundproof case 65.

[0041] In other words, the soundproof case 65 is a combination of a main body and an auxiliary member 66. The main body is the soundproof case 40 itself, and is a semi-box shape having a front wall 41 and left and right side walls 42 and 43, with the top and rear open. There is also a large slit 45 on the bottom. An opening 47 is provided in the front wall 41. The auxiliary member 66 has a top wall 67 and a rear wall 68. The top wall 67 is provided with a notch 70, which, when combined with the main body (soundproof case 40), forms an opening through which the inlet-side piping 52 is inserted.

[0042] In the embodiments described above, a segmental gear type pump was used as the hydraulic pump 20. That is, the gear-shaped rotating members 22 and 23 have an arc shape at the tip of the teeth. However, the present invention is not limited to this configuration, and the shape of the tooth profile may be other shapes as long as the meshing ratio is 1 or less. For example, an involute tooth profile or a cycloid tooth profile may be used as long as the meshing ratio is 1 or less. Alternatively, a tooth profile based on straight lines, such as a triangular tooth, may also be used. Each gear is preferably a helical gear or a serrated gear, with a tooth trace that is inclined or curved. Of course, a gear pump may also be equipped with a gear-shaped rotating member in which the tip of the tooth is arc-shaped, giving it the characteristics of a segmented gear type pump, and in which the tooth trace is inclined or curved, like a helical or serrated gear. The meshing ratio of a pair of gear-like rotating members is preferably 1. For example, in a gear pump using involute-toothed spur gears, the meshing ratio of the gear pair may be 1 or less than 1. For example, in a gear pump using involute-toothed spur gears, the teeth of opposing gear-like rotating members may always be in contact at one point during rotation. Alternatively, a vane pump can be used instead of a gear pump.

[0043] In the embodiments described above, a rotary plate type loading device was exemplified as one type of loading device 207, but the present invention does not limit the structure of the loading device. As one type of loading device, there is also a "press type loading device" as shown in Figure 11. The press type loading device has a structure in which a sliding plate 209 and a pressing plate 251 are combined, as shown in Figure 11. The present invention can also be applied to refuse collection vehicles equipped with a press-type loading device. In a refuse collection vehicle equipped with a "press-type loading device," hydraulic fluid is supplied from a hydraulic pump 20 to the hydraulic actuators that operate the sliding plate 209 and the pushing plate 251. Furthermore, in the embodiments described above, when discharged from the refuse container 202, the refuse container 202 is tilted by the dump cylinder 225 (Figure 2). However, a pressing device may be provided inside the refuse container 202, and the refuse may be pushed out by this pressing device. In this case, hydraulic fluid is supplied from the hydraulic pump 20 to the hydraulic actuator that operates the pressing device.

[0044] The inventions according to the embodiments described above can be substituted or combined as long as no contradictions arise. Furthermore, the above embodiments allow for the free substitution or addition of components between each embodiment, as long as they fall within the technical scope of the present invention. [Explanation of Symbols]

[0045] 1: Refuse collection vehicle, 2: Truck vehicle (body), 10: Refuse collection device, 15: Main unit, 20: Hydraulic pump, 21: Casing, 22: Gear-shaped rotating member, 23: Gear-shaped rotating member, 25: Valley, 26: Space, 30: Inlet, 31: Outlet, 38: Hydraulic tank, 40: Soundproof case, 60: First discharge piping, 65: Soundproof case, 202: Refuse container, 203: Refuse input box, 207: Loading device, 221: Push cylinder (hydraulic actuator), 225: Dump cylinder (hydraulic actuator), 231: Opening / closing cylinder (hydraulic actuator)

Claims

1. A refuse collection vehicle comprising a vehicle body and a refuse collection device mounted on the vehicle body, wherein the refuse collection device includes a refuse container for storing refuse, a loading device for introducing refuse into the refuse container, a hydraulic actuator for driving any of the devices, and a hydraulic pump for supplying hydraulic fluid to the hydraulic actuator. The aforementioned hydraulic pump is characterized by being of one of the following types in the refuse collection vehicle. (1) A gear pump in which a pair of gear-shaped rotating members are provided inside a casing, and hydraulic fluid is sealed in and delivered into the space formed between the inner wall of the casing and the grooves of the teeth of the gear-shaped rotating members, wherein the teeth of opposing gear-shaped rotating members make contact at one point during rotation. (2) Vane pump.

2. A refuse collection vehicle comprising a vehicle body and a refuse collection device mounted on the vehicle body, wherein the refuse collection device includes a refuse container for storing refuse, a loading device for introducing refuse into the refuse container, a hydraulic actuator for driving any of the devices, and a hydraulic pump for supplying hydraulic fluid to the hydraulic actuator. The aforementioned hydraulic pump is a gear pump having a gear pair with a meshing ratio of 1 or less, characterized in that it is a refuse collection vehicle.

3. The refuse collection vehicle according to claim 1 or 2, characterized in that an elastic piping member is connected to the discharge side of the hydraulic pump.

4. The refuse collection vehicle according to claim 1 or 2, characterized in that it has a case that covers the area around the hydraulic pump.

5. The refuse collection vehicle according to claim 1 or 2, characterized in that the hydraulic pump is a gear pump equipped with helical gears or serpentine gears.

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