Crankshaft connecting rod plunger type hydraulic motor

Abstract

A crankshaft connecting rod plunger hydraulic motor includes a cylinder body with a main chamber and a connecting rod chamber. A crankshaft with a crankshaft protrusion is mounted in the main chamber. A plunger with a connecting rod is mounted in the connecting rod chamber. A second bearing is mounted on the outside of the crank protrusion, and the connecting rod is connected to the outer ring of the second bearing. An oil distribution section and an output section are respectively provided at both ends of the crank protrusion. A portion of the end face of the output section, which connects to one end of the crank protrusion, is exposed, forming a positioning shoulder. The side surface of the oil distribution section corresponding to the positioning shoulder does not extend beyond the side surface of the crank protrusion. A first bearing and a third bearing are respectively mounted on the oil distribution section and the output section. The first and third bearings are assembled and connected to the cylinder body. Positioning pads for positioning the first or third bearing are provided on the end faces of both ends of the crank protrusion. This application replaces sliding friction with rolling friction in the crankshaft assembly design and avoids contact between the bearing and the crank protrusion through the design of the positioning pads, greatly reducing mechanical wear.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic motor technology, specifically relating to a crankshaft connecting rod plunger hydraulic motor. Background Technology

[0002] In traditional hydraulic motor designs, the connection between the crankshaft and connecting rod typically employs sliding friction. During operation, the crankshaft's camshaft directly contacts and moves relative to the connecting rod, resulting in significant sliding friction. Due to the inherent characteristics of sliding friction, mechanical wear on the friction pair surfaces rapidly intensifies over prolonged operation or under high pressure and high load conditions. Especially when lubrication is insufficient, the accumulation of wear particles further accelerates component failure and significantly shortens the motor's lifespan.

[0003] Furthermore, bearings are installed at both ends of the crankshaft. During long-term operation, these bearings may experience axial displacement due to vibration, load fluctuations, or assembly errors. When the outer ring of the bearing shifts, direct contact easily occurs between the bearing and the crankshaft cam, creating additional frictional interference. This contact not only increases operating resistance and energy loss but also exacerbates wear on the bearings and crankshaft due to localized stress concentration. Ultimately, this leads to unstable motor operation, increased noise, and even jamming, further limiting the reliability and service life of the hydraulic motor.

[0004] In summary, traditional hydraulic motors still have technical defects in the connection structure between the crankshaft and connecting rod and the bearing positioning design that urgently need to be addressed. It is imperative to overcome the high wear problem caused by sliding friction and the interference wear problem caused by insufficient bearing positioning through innovative structural design, so as to improve the efficiency and durability of hydraulic motors. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0006] A crankshaft connecting rod plunger hydraulic motor includes a cylinder body with a main cavity and several connecting rod cavities evenly distributed around the main cavity. A crankshaft with a crankshaft protrusion is mounted in the main cavity. A plunger is mounted in each connecting rod cavity, and a connecting rod is mounted on the plunger. A second bearing is mounted on the outside of the crank protrusion, and the connecting rod is connected to the outer ring of the second bearing. An oil distribution section and an output section are respectively provided at both ends of the crank protrusion. A portion of the end face of the output section, which connects to one end of the crank protrusion, is exposed, forming a positioning shoulder for positioning the second bearing. The side surface of the oil distribution section corresponding to the positioning shoulder does not extend beyond the side surface of the crank protrusion. A first bearing and a third bearing are respectively mounted on the oil distribution section and the output section. The first and third bearings are connected to the cylinder body. Positioning pads for positioning the first or third bearing are provided on the end faces of both ends of the crank protrusion.

[0007] In traditional hydraulic motors, the crankshaft and connecting rod experience sliding friction. This application, however, replaces this traditional sliding friction by incorporating a second bearing between the crankshaft's crankshaft protrusion and the connecting rod, significantly reducing mechanical wear. Furthermore, the design of the locating pads at both ends of the crankshaft protrusion prevents direct contact between the bearing and the crankshaft protrusion, further reducing frictional interference during operation.

[0008] In a preferred embodiment, the positioning shoulder is provided with a plurality of protrusions, the height of which the protrusions from the positioning shoulder are equal to the height of the positioning pad layer used to position the third bearing.

[0009] In a preferred embodiment, both the first bearing and the third bearing have protrusions on their inner rings, which abut against the positioning pad layer.

[0010] In a preferred embodiment, one end of the connecting rod is a ball seat, and the other end is a curved seat that fits the outer ring of the second bearing, with the ball seat placed in the plunger.

[0011] In a preferred embodiment, the curved seat is fixedly connected to the outer ring of the second bearing by a plurality of binding rings, and the curved seat is provided with binding grooves for fastening the binding rings.

[0012] In a preferred embodiment, the connecting rod is provided with an oil guide channel extending from the ball seat to the curved seat, and the plunger is provided with an oil passage hole that matches the oil guide channel.

[0013] In a preferred embodiment, the cylinder block is further provided with an oil distribution chamber, an oil inlet and an oil outlet connected to the oil distribution chamber, and the connecting rod chamber and the oil distribution chamber are connected by an oil passage. An oil distribution assembly is installed in the oil distribution chamber.

[0014] In a preferred embodiment, the oil distribution assembly includes a gasket and an oil distribution seat. The oil distribution seat has an oil inlet area and an oil outlet area. The oil inlet area has an oil inlet groove communicating with the oil inlet, and the oil outlet area has an oil outlet groove communicating with the oil outlet. The oil distribution seat is fixedly connected to the oil distribution part by a connecting rod. The gasket is placed between the top wall of the oil distribution cavity and the oil distribution seat, and the gasket has an oil passage groove corresponding to the oil passage.

[0015] In a preferred embodiment, key-type square grooves are provided on both the end face of the oil distribution part and the oil distribution seat, and protrusions that mate with the square grooves are provided at both ends of the connecting rod.

[0016] Compared with the prior art, this application has the following beneficial technical effects: It provides a crankshaft connecting rod plunger hydraulic motor, which has made innovative optimizations in the design of crankshaft assembly, replacing traditional sliding friction with rolling friction, and avoiding contact between bearings and crank protrusions through the design of positioning pads, which greatly reduces mechanical wear, significantly extends the service life of hydraulic motor and improves transmission efficiency. Attached Figure Description

[0017] Figure 1 This is a 3D view of a hydraulic motor.

[0018] Figure 2 This is a top view of the hydraulic motor.

[0019] Figure 3 for Figure 2 Sectional view of AA.

[0020] Figure 4 This is a front view of the hydraulic motor.

[0021] Figure 5 for Figure 4 BB section view.

[0022] Figure 6 This is an assembly drawing of the crankshaft and connecting rod components.

[0023] Figure 7 A front view of the crankshaft and bearing assembly.

[0024] Figure 8 For the three-dimensional crankshaft Figure 1 .

[0025] Figure 9 For the three-dimensional crankshaft Figure 2 .

[0026] Figure 10 This is a three-dimensional view of the connecting rod.

[0027] Figure 11 This is an assembly drawing of the connecting rod and plunger.

[0028] Figure 12 This is a structural assembly drawing of the oil distribution assembly.

[0029] Figure 13 This is a layout diagram of the oil inlet, oil outlet, and oil distribution chamber.

[0030] Figure 14 For the three-dimensional oil fitting base Figure 1 .

[0031] Figure 15 For the three-dimensional oil fitting base Figure 2 .

[0032] The following is an explanation of the possession markings:

[0033] 100. Cylinder block; 110. Main chamber; 111. Oil distribution chamber; 112. Oil inlet; 113. Oil outlet; 120. Connecting rod chamber; 121. Oil passage; 130. Plunger; 131. Oil passage; 140. Connecting rod; 141. Ball seat; 142. Curved seat; 143. Binding groove; 144. Oil guide channel; 150. Binding ring;

[0034] 200, Crankshaft; 201, Oil distribution section; 202, Crankshaft protrusion; 203, Output section; 204, Positioning shoulder; 205, Protrusion; 206, Positioning pad; 210, First bearing; 220, Second bearing; 230, Third bearing; 240, Protrusion;

[0035] 300. Oil distribution assembly; 310. Gasket; 311. Oil passage groove; 320. Oil distribution seat; 321. Oil inlet area; 322. Oil inlet groove; 323. Oil outlet area; 324. Oil outlet groove; 325. Square groove; 330. Connecting rod. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] In the following embodiments, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this utility model, it should be understood that the terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, and counterclockwise, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Reference Figures 1 to 15A crankshaft connecting rod plunger hydraulic motor includes a cylinder body 100. The cylinder body 100 has a main cavity 110 and several connecting rod cavities 120 evenly distributed around the main cavity 110. A crankshaft 200 is mounted in the main cavity 110, and the crankshaft 200 has a curved protrusion 202. A plunger 130 is mounted in each of the connecting rod cavities 120, and a connecting rod 140 is mounted on the plunger 130. A second bearing 220 is mounted outside the curved protrusion 202, and the connecting rod 140 is connected to the outer ring of the second bearing 220. The curved protrusion 202 has an oil distribution section 201 and an output section 203 at its two ends. The output section 203 exposes a portion of its end face, forming a positioning shoulder 204 for positioning the second bearing 220. The side surface of the oil distribution section 201 corresponding to the positioning shoulder 204 does not extend beyond the side surface of the curved protrusion 202; this design facilitates the installation of the second bearing 220. The oil distribution section 201 and the output section 203 are respectively equipped with a first bearing 210 and a third bearing 230. The first bearing 210 and the third bearing 230 are assembled and connected to the cylinder block 100. Positioning pads 206 for positioning the first bearing 210 or the third bearing 230 are provided on the end faces of both ends of the curved protrusion 202.

[0040] In traditional hydraulic motors, the crankshaft 200 and connecting rod 140 experience sliding friction. However, this application replaces this sliding friction by installing a second bearing 220 between the crankshaft 200's convex portion 202 and the connecting rod 140, significantly reducing mechanical wear. Furthermore, the design of the positioning pads 206 at both ends of the convex portion 202 avoids direct contact between the bearing and the convex portion 202, further reducing frictional interference during operation.

[0041] Furthermore, the positioning shoulder 204 is provided with several protrusions 205. The height of the protrusions 205 from the positioning shoulder 204 is equal to the height of the positioning pad 206 used to position the third bearing 230. The protrusions 205, in conjunction with the positioning pad 206, can form a gap between the third bearing 230 and the first bearing 210. Both the first bearing 210 and the third bearing 230 have protrusions 240 on their inner rings, which abut against the positioning pad 206. The design of the protrusions 240 increases the gap between the first bearing 210, the third bearing 230, and the curved protrusion 202, preventing the bearings from directly contacting the curved protrusion 202 due to axial displacement caused by vibration or load, thereby enhancing the reliability and durability of the overall structure.

[0042] In this application, one end of the connecting rod 140 is a ball seat 141, and the other end is a curved seat 142 that fits the outer ring of the second bearing 220. The ball seat 141 is placed in the plunger 130. The curved seat 142, designed to fit the outer ring of the bearing, ensures uniform force on the contact surface, reduces friction and wear, and guarantees transmission efficiency. The curved seat 142 is fixedly connected to the outer ring of the second bearing 220 by several binding rings 150. The curved seat 142 is provided with binding grooves 143 for engaging the binding rings 150. This design can easily and firmly fix the curved seat 142 to the outer ring of the bearing, preventing loosening or falling off. Furthermore, the connecting rod 140 is provided with an oil guide channel 144 extending from the ball seat 141 to the curved seat 142, and the plunger 130 is provided with an oil passage hole 131 that matches the oil guide channel 144. The oil guide channel 144 and the oil passage hole 131 form a lubrication path, which can directly deliver lubricating oil to the contact area between the connecting rod 140 and the second bearing 220, reducing the risk of dry friction, reducing wear, and promoting heat dissipation to extend the service life of the components.

[0043] The hydraulic motor described in this application drives the crankshaft 200 to rotate via the oil distribution assembly 300 and the plunger 130. Specifically, the cylinder block 100 is also provided with an oil distribution chamber 111, an oil inlet 112 and an oil outlet 113 connected to the oil distribution chamber 111, and the connecting rod chamber 120 and the oil distribution chamber 111 are connected by an oil passage 121. The oil distribution assembly 300 is installed in the oil distribution chamber 111. The oil distribution assembly 300 is used to control the inflow and outflow of oil in each connecting rod chamber 120. The oil distribution assembly 300 includes a gasket 310 and an oil distribution seat 320. The oil distribution seat 320 has an oil inlet area 321 and an oil outlet area 323. The oil inlet area 321 is provided with an oil inlet groove 322 connected to the oil inlet 112, and the oil outlet area 323 is provided with an oil outlet groove 324 connected to the oil outlet 113. The oil distribution seat 320 is fixedly connected to the oil distribution part 201 via the connecting rod 330. The pad 310 is placed between the top wall of the oil distribution cavity 111 and the oil distribution seat 320. The pad 310 is provided with an oil passage groove 311 corresponding to the oil passage 121.

[0044] To ensure a stable and reliable connection between the oil distribution seat 320 and the crankshaft 200, keyed square grooves 325 are provided on both the end face of the oil distribution part 201 and the oil distribution seat 320. The connecting rod 330 has protrusions at both ends that mate with the square grooves 325. The engagement of the keyed square grooves 325 and the protrusions prevents relative rotation between the connecting rod 330 and the oil distribution assembly 300 during rotation or vibration, ensuring precise alignment between the oil distribution seat 320 and the oil distribution part 201.

[0045] The working principle of the hydraulic motor described in this application is as follows: For ease of explanation, the connecting rod chamber 120 in this application has five groups, namely chamber A, chamber B, chamber C, chamber D, and chamber E. Initially, the oil inlet area 321 of the distributor 320 is connected to chambers A and B, and the oil outlet area 323 is connected to chambers D and E. When the motor is running, the oil pump injects oil into chambers A and B through the oil inlet 112, driving the plungers 130 of both chambers to extend outwards, pushing the corresponding connecting rod 140 to rotate the crankshaft 200 through a certain angle. During this period, the plungers 130 corresponding to chambers D and E are passively retracted, and the oil in chambers D and E flows back to the oil pump through the oil outlet 113. The rotation of the crankshaft 200 drives the distributor 320 to rotate synchronously, causing the oil inlet area 321 to switch to chambers B and C, and the oil outlet area 323 to switch to chambers E and A. Oil continues to enter chamber B, the plunger 130 corresponding to chamber B extends further, and chamber C begins to enter oil for energy storage. Meanwhile, oil continues to return from chamber E, and the plunger 130 corresponding to chamber E retracts further, while chamber A begins to return oil.

[0046] As the crankshaft 200 continues to rotate, the oil distribution seat 320 rotates continuously with the crankshaft 200, causing the five connecting rod chambers 120 to sequentially undergo the working cycle of oil inlet extension (pushing the crankshaft 200) → pressure maintenance → oil return contraction in the order of A→B→C→D→E. The corresponding five sets of connecting rods 140 drive the crankshaft 200 to rotate continuously, ultimately achieving a smooth torque output.

[0047] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. A crankshaft connecting rod plunger type hydraulic motor, comprising a cylinder body (100), wherein the cylinder body (100) has a main cavity (110) and a plurality of connecting rod cavities (120) evenly distributed around the main cavity (110), a crankshaft (200) is assembled in the main cavity (110), the crankshaft (200) has a crank protrusion (202), a plunger (130) is assembled in the connecting rod cavity (120), and a connecting rod member (140) is assembled on the plunger (130), characterized in that, The curved protrusion (202) is externally fitted with a second bearing (220), and the connecting rod (140) is connected and assembled with the outer ring of the second bearing (220). The two ends of the curved protrusion (202) are respectively provided with an oil distribution part (201) and an output part (203). The output part (203) is used to connect a portion of the end face of one end of the curved protrusion (202) which is exposed. This portion of the end face forms a positioning shoulder (204) for positioning the second bearing (220). The side surface of the oil distribution part (201) corresponding to the positioning shoulder (204) does not extend beyond the side surface of the curved protrusion (202). The oil distribution section (201) and the output section (203) are respectively equipped with a first bearing (210) and a third bearing (230). The first bearing (210) and the third bearing (230) are assembled and connected to the cylinder block (100). The end faces of the two ends of the curved protrusion (202) are provided with positioning pads (206) for positioning the first bearing (210) or the third bearing (230).

2. A crankshaft connecting rod plunger type hydraulic motor according to claim 1, wherein The positioning shoulder (204) is provided with several protrusions (205), and the height of the protrusions (205) protruding from the positioning shoulder (204) is equal to the height of the positioning pad (206) used to position the third bearing (230).

3. A crankshaft connecting rod plunger type hydraulic motor according to claim 1, wherein Both the first bearing (210) and the third bearing (230) have a protrusion (240) on the inner ring of the bearing, and the protrusion (240) abuts against the positioning pad (206).

4. A crankshaft connecting rod plunger type hydraulic motor according to claim 1, wherein One end of the connecting rod (140) is a ball seat (141), and the other end is a curved seat (142) that fits the outer ring of the second bearing (220). The ball seat (141) is placed in the plunger (130).

5. A crankshaft connecting rod plunger type hydraulic motor according to claim 4, wherein The curved seat (142) is fixedly connected to the outer ring of the second bearing (220) by a number of binding rings (150), and the curved seat (142) is provided with binding grooves (143) for fastening the binding rings (150).

6. A crankshaft connecting rod plunger type hydraulic motor according to claim 5, wherein The connecting rod (140) has an oil guide channel (144) that extends from the ball seat (141) to the curved seat (142), and the plunger (130) has an oil passage (131) that matches the oil guide channel (144).

7. A crankshaft connecting rod plunger type hydraulic motor according to claim 1, wherein The cylinder block (100) is also provided with an oil distribution chamber (111), an oil inlet (112) and an oil outlet (113) connected to the oil distribution chamber (111), and the connecting rod chamber (120) and the oil distribution chamber (111) are connected by an oil passage (121); the oil distribution chamber (111) is equipped with an oil distribution assembly (300).

8. A crankshaft connecting rod plunger type hydraulic motor according to claim 7, wherein The oil distribution assembly (300) includes a gasket (310) and an oil distribution seat (320). The oil distribution seat (320) has an oil inlet area (321) and an oil outlet area (323). The oil inlet area (321) is provided with an oil inlet groove (322) that connects to the oil inlet port (112), and the oil outlet area (323) is provided with an oil outlet groove (324) that connects to the oil outlet port (113). The oil distribution seat (320) is fixedly connected to the oil distribution part (201) via the connecting rod (330). The pad (310) is placed between the top wall of the oil distribution cavity (111) and the oil distribution seat (320). The pad (310) is provided with an oil passage groove (311) corresponding to the oil passage (121).

9. A crankshaft connecting rod plunger type hydraulic motor according to claim 8, wherein Both the end face of the oil distribution part (201) and the oil distribution seat (320) are provided with key-type square grooves (325), and both ends of the connecting rod (330) are provided with protrusions that fit the square grooves (325).

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