A survey vehicle with easily adjustable power unit

Abstract

This invention relates to the field of power adjustment system technology, and in particular provides a survey vehicle that facilitates the adjustment of the power unit. It includes a rear axle assembly with a frame and a sub-frame mounted on it. The rear axle drive shaft system is mounted on the frame and connected via a sprocket assembly and chain drive. It includes a pressure arm transferred to the sub-frame and a tension wheel transferred to the pressure arm. It also includes a hanger mounted on the sub-frame and a secondary pressure arm transferred to the hanger. The secondary pressure arm is positioned opposite each other in the compression direction, with one end of its oil outlet close to the point of closest engagement between the tension wheel and the chain. A tension spring is used to tighten the secondary pressure arm and the hanger, pressing the free end of the secondary pressure arm against the pressure arm to create pressure, which is then transferred to the chain via the tension wheel. The vibration generated by the chain applies lubricating oil to the chain, ensuring that chain lubrication does not fail, reducing wear, lowering the risk of loosening, and ensuring the normal operation of the power system.

Description

Technical Field

[0001] This invention relates to the field of power adjustment system technology for survey vehicles, and particularly to a survey vehicle with easily adjustable power unit. Background Technology

[0002] Survey vehicles often operate in complex terrains (such as rugged mountain roads, muddy wetlands, and mining areas), making reliable power transmission crucial. To adapt to complex road conditions and provide sufficient power, survey vehicles often employ a rear axle chain drive structure, transmitting driving force to the wheels via a chain connecting sprocket assemblies. This structure is relatively simple, can withstand significant impacts, and is a common choice for engineering vehicles.

[0003] However, chain drives face significant challenges under harsh operating conditions (high dust, mud, sand, rain, severe vibrations, etc.): for example, during long-term operation, the chain inevitably becomes loose due to wear and stretching, as its length increases. Insufficient lubrication exacerbates wear and accelerates the loosening process. A loose chain is prone to jumping and slapping during operation, which not only generates noise but, in more serious cases, can lead to skipped teeth, chain derailment, or even jamming and breakage, causing equipment failure or safety accidents. Summary of the Invention

[0004] To address the above problems, the present invention provides the following technical solution:

[0005] A survey vehicle with an easily adjustable power unit includes:

[0006] The rear axle assembly has a frame and a sub-frame mounted on it. The rear axle drive shaft system is mounted on the frame and connected via a sprocket assembly and chain drive.

[0007] The adjusting mechanism includes a pressure arm that is transferred to the subframe and a tensioning wheel that is transferred to the pressure arm;

[0008] The auxiliary regulating mechanism includes a hanger mounted on the auxiliary frame and an auxiliary pressure arm connected to the hanger;

[0009] A piston-type fuel injector is positioned opposite to the compression direction of the auxiliary pressure arm. One end of its piston rod is movably connected to the auxiliary pressure arm, and one end of its oil outlet is close to the nearest meshing point between the tension wheel and the chain.

[0010] The auxiliary pressure arm is tensioned to the hanger by a tension spring 1312, which presses the free end of the auxiliary pressure arm onto the pressure arm to form pressure. The pressure arm then transmits the pressure to the chain through the tension wheel. The jumping that occurs when the chain is transmitted is transmitted in sequence to the tension wheel, the pressure arm, the auxiliary pressure arm, and the piston rod of the piston-type fuel injector.

[0011] As a further preferred embodiment, the sprocket assembly includes a driving sprocket and a driven sprocket mounted on the drive shaft system, with a chain drive connected to the driving sprocket and the driven sprocket. The sprocket assembly also includes a small sprocket that is transferred to the subframe, the small sprocket also engaging with the chain and located between the transmission of the chain from the tensioner to the driving sprocket.

[0012] As a further preferred embodiment, one end of the pressure arm, on which the tension wheel is mounted, is bent toward the outside of the chain, and the tension wheel is engaged with the outside of the chain. A bushing is mounted on the sub-frame, and the small sprocket is mounted on the bushing via a bearing. A fixing rod is mounted on the sub-frame, and the fixing rod passes through the bushing. The screw-on end of the pressure arm is sleeved on the fixing rod, so that the rotation of the small sprocket will not affect the pressure arm.

[0013] As a further preferred embodiment, the auxiliary pressure arm is located outside the pressure arm, one end of the auxiliary pressure arm is connected to the hanger, and the other end is provided with a rubber pressure seat, and the auxiliary pressure arm is pressed against the outer surface of the auxiliary pressure arm through the rubber pressure seat.

[0014] As a further preferred embodiment, the pressure arm has a clamping cavity, the chain is transmitted from the drive sprocket to the small sprocket and passes through the clamping cavity, and the piston-type fuel injector is disposed in the clamping cavity.

[0015] As a further preferred embodiment, a boom is connected to the hanger, the boom extends into the clamping cavity, the outer cylinder wall of the piston-type fuel injector is hinged to the boom, the auxiliary pressure arm is provided with a hinge groove, and one end of the piston rod of the piston-type fuel injector is hinged to the hinge groove.

[0016] As a further preferred embodiment, the piston cylinder of the piston-type fuel injector is connected to a compensation pipe, the other end of which extends from the clamping cavity to the outside of the pressure arm, and a one-way valve is installed on the pipeline of the compensation pipe.

[0017] The advantages of this invention compared to the prior art are:

[0018] 1. Through the linkage of the adjustment mechanism, the secondary adjustment mechanism, and the tension spring 1312, automatic and continuous compensation for chain looseness is achieved. The precise selection of the tension spring 1312 ensures moderate and stable tension, effectively preventing chain slippage and tooth skipping caused by excessive chain slack, while avoiding negative problems such as excessive chain link wear and chain plate fatigue fracture caused by excessive tension. This significantly extends the life of the chain and sprockets, and provides adaptive tensioning and overload protection.

[0019] 2. The pressure arm is equipped with a clamping cavity, within which a piston-type oil injector is positioned opposite each other. The oil outlet of the piston-type oil injector is directly aimed at the "nearest point of contact" between the tensioner pulley and the chain. The lubricating oil is directly sprayed into the critical area where the chain and tensioner pulley teeth just begin to contact and the load is about to be applied. At this point, the lubricating oil most easily penetrates into the tiny gaps between the chain rollers, pins, and bushings before high-pressure contact occurs, forming an effective oil film. The vibration generated by the chain spreads the lubricating oil onto the chain, ensuring that chain lubrication does not fail, reducing wear, lowering the risk of loosening, and ensuring the normal operation of the power system.

[0020] 3. Utilizing the common-sense tensioning method where the diameter of the tensioner pulley is usually much smaller than that of the driving / driven sprockets, the small tensioner pulley rotates at high speed multiple times when the chain moves a single link. The lubricating oil sprayed onto the tensioner pulley teeth is quickly dispersed and evenly spread across the entire tooth surface by the centrifugal force of its high-speed rotation. When the chain links come into contact with the high-speed rotating, lubricated tensioner pulley teeth, it acts like a small "rotating oiling brush," efficiently and relaying the lubricating oil to the chain's hinge areas. This shortens the "journey" and time for the oil to travel from spraying to acting on the key friction pairs of the chain, greatly improving lubricant utilization and coating efficiency. Attached Figure Description

[0021] Figure 1 A partial plan view of a survey vehicle with an adjustable power unit, provided for an embodiment of the present invention;

[0022] Figure 2 The embodiments of the present invention are provided by Figure 1 Enlarged schematic diagram of part A;

[0023] Figure 3 The embodiments of the present invention are provided by Figure 1 A schematic diagram from a three-dimensional perspective;

[0024] Figure 4 The embodiments of the present invention are provided by Figure 3 Enlarged schematic diagram of section B;

[0025] Figure 5 The embodiments of the present invention are provided by Figure 1 The resulting top-view plan view;

[0026] Figure 6 The embodiments of the present invention are provided by Figure 3 A schematic diagram from another rotating perspective;

[0027] Figure 7 The embodiments of the present invention are provided by Figure 6 Enlarged schematic diagram of section C;

[0028] Figure 8This is a schematic diagram of the secondary adjustment mechanism in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the adjustment mechanism in an embodiment of the present invention.

[0030] In the diagram: 1. Survey vehicle; 11. Rear axle assembly; 111. Frame; 112. Sub-frame; 1121. Bushing; 1122. Fixing rod; 12. Adjustment mechanism; 121. Pressure arm; 1211. Clamping cavity; 122. Tensioner wheel; 13. Secondary adjustment mechanism; 131. Hanger; 1311. Boom; 132. Secondary pressure arm; 1321. Hinge groove; 133. Rubber pressure seat; 14. Piston-type fuel injector; 141. Piston rod; 142. Oil outlet; 1141. Drive sprocket; 1142. Driven sprocket; 1143. Small sprocket. Detailed Implementation

[0031] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] In one implementation, such as Figures 1-9 As shown:

[0033] This embodiment provides a survey vehicle with an easily adjustable power unit. The survey vehicle 1 includes:

[0034] The rear axle assembly 11 (the main feature of this invention is in the rear axle position, so the figure only shows the partial structure of the rear axle) has a frame 111 and a sub-frame 112 mounted on the rear axle assembly 11. The rear axle drive shaft system is mounted on the frame 111 and is connected by a sprocket assembly and a chain drive.

[0035] The adjusting mechanism 12 includes a pressure arm 121 that is transferred to the sub-frame 112 and a tensioning wheel 122 that is transferred to the pressure arm 121;

[0036] The auxiliary adjustment mechanism 13 includes a hanger 131 mounted on the auxiliary frame 112 and an auxiliary pressure arm 132 connected to the hanger 131.

[0037] The piston-type oil injector 14 is positioned opposite to the compression direction of the auxiliary pressure arm 132. One end of its piston rod 141 is movably connected to the auxiliary pressure arm 132, and one end of its oil outlet 142 is close to the nearest meshing point between the tension wheel 122 and the chain.

[0038] The auxiliary pressure arm 132 is tensioned to the hanger 131 by a tension spring 1312, which presses the free end of the auxiliary pressure arm 132 onto the pressure arm 121 to form pressure. The pressure arm 121 then applies the pressure to the chain through the tension wheel 122. The jumping that occurs when the chain is transmitted is sequentially transmitted to the tension wheel 122, the pressure arm 121, the auxiliary pressure arm 132, and the piston rod 141 of the piston-type fuel injector 14.

[0039] When the rear axle assembly 11 transmits power through the sprocket assembly and chain assembly, chain loosening is inevitable. This is due to factors including friction and tension over time, which gradually wears down the chain, increasing its length and causing loosening. Insufficient chain lubrication also increases friction, accelerating chain wear and leading to loosening. To ensure the reconnaissance vehicle operates normally in harsh environments while also providing lubrication, this reconnaissance vehicle 1 employs chain drive, utilizing an adjustment mechanism 12 and a secondary adjustment mechanism 13 to provide tension to the chain and reduce loosening.

[0040] When the chain becomes loose, the tension spring 1312 automatically tightens, dragging the free end of the auxiliary pressure arm 132 to press against the pressure arm 121, creating pressure. The pressure arm 121 then provides pressure to the tension wheel 122, ensuring that the tension wheel 122 continuously engages and presses against the chain, reducing the chain's looseness. However, excessive chain tension can also have negative effects, such as increased wear on the chain, excessive engagement of chain links with the sprocket, and wear failure. Over-tightening can also cause fatigue in the chain links, and excessive wear can lead to chain breakage. Therefore, the selection of the tension spring 1312 must satisfy both the requirement of pressing the auxiliary pressure arm 132 against the pressure arm 121 and the requirement that the chain is not excessively loose when the tension wheel 122 is pressing against the chain. The chain is pressed by the auxiliary pressure arm 132 against the pressure arm 121, which in turn presses the tension wheel 122 against the chain. Finally, the tension spring 1312 tightens the auxiliary pressure arm 132 to provide pressure. These components sequentially form multiple contact points, and these contact points are not fixed, ensuring that the chain has a sense of slack without slipping off. Moreover, during transmission, the chain vibrates in the radial direction of the sprocket. The vibration acts on the tension wheel 122, which transmits it to the pressure arm 121, then to the auxiliary pressure arm 132, and finally to the tension spring 1312 and the piston rod 141 of the piston-type fuel injector 14. The vibration transmitted to the tension spring 1312 ensures that the chain is not completely taut. During the transmission of chain vibration, the connection point between the auxiliary pressure arm 132 and the piston rod 141 will undergo axial reciprocating micro-displacement. This displacement directly drives the piston rod 141 to perform a high-frequency, short-stroke reciprocating suction motion within the cylinder of the piston-type fuel injector 14. The chain's vibration frequency, typically related to the transmission speed, provides the power source for this reciprocating motion. Each "pull-back" stroke of the piston rod 141 generates negative pressure within the cylinder, drawing in a small amount of external lubricating oil; the subsequent "pull-out" stroke pressurizes the lubricating oil in the front chamber of the cylinder, resulting in injection through the outlet 142. The tension spring 1312 not only provides initial tension pressure, but its elastic properties also transmit and amplify minute vibration displacements, while simultaneously absorbing some high-frequency impacts, protecting the piston-type fuel injector 14.

[0041] In this embodiment, the oil injection action is directly driven by the reciprocating motion of the piston rod 141, thus its oil injection frequency is synchronized with the chain vibration frequency. More importantly, the oil outlet 142 of the piston-type oil injector 14 is precisely positioned and points towards the "nearest engagement point" where the tensioner 122 and the chain are about to engage or have just made contact. This position is a critical point where the load begins to apply and the lubricating oil film is most easily squeezed out, improving the lubrication effect. The vibration generated by the chain applies lubricating oil to the chain, ensuring that the chain lubrication does not fail, reducing wear, lowering the risk of loosening, and ensuring the normal operation of the power system. (Supplementary explanation: Here, "nearest engagement point" refers to the starting area where the chain and the tensioner tooth surface make contact and begin to transmit pressure. It is usually located slightly ahead of the tangent direction of the tensioner contact point and is the most effective area for lubricating oil to penetrate into the chain pin / roller).

[0042] In this embodiment, the vibration transmitted to the piston rod 141 is converted into an oil-forming effect within the piston-type fuel injector 14, which intermittently sprays the lubricating oil in the piston-type fuel injector 14 through the oil outlet 142 at the other end to the closest meshing point between the tensioner 122 and the chain, thus lubricating it. The vibration force is converted into a force that drives the piston rod 141 to move, and by utilizing the reciprocating vibration characteristics of the vibration force, the piston rod 141 in the piston-type fuel injector 14 performs frequent pulling (hydraulic injection) actions within the piston cylinder.

[0043] In this embodiment, based on common knowledge of tensioning, the tensioning wheel 122 is often smaller than the chain, and also much smaller than the driving and driven sprockets 1142 at both ends of the chain. Therefore, when the chain rotates once, the tensioning wheel 122 will rotate multiple times, and the number of rotations is significantly higher than that of the driving and driven sprockets 1142. After the tensioning wheel 122 receives the lubricating oil, it is equivalent to a small "rotating oiling brush," and the lubricating oil is efficiently and relay-style "brushed" to the hinge parts of the chain. This shortens the "stroke" and time of the oil from spraying out to acting on the key friction pairs of the chain, greatly improving the utilization rate and coating efficiency of the lubricant.

[0044] like Figure 1 , Figure 5 As shown, the sprocket assembly includes a drive sprocket 1141 and a driven sprocket 1142 mounted on the drive shaft system. The chain drive is connected to the drive sprocket 1141 and the driven sprocket 1142. The sprocket assembly also includes a small sprocket 1143 that is transferred to the sub-frame 112. The small sprocket 1143 also engages with the chain and is located between the transmission of the chain from the tensioner 122 to the drive sprocket 1141.

[0045] The small sprocket 1143 acts as an intermediate support point, altering the path and wrap angle of the chain from the tensioner 122 to the drive sprocket 1141. It divides the originally long chain span from the tensioner 122 directly to the drive sprocket 1141 into two shorter spans, creating a tensioning effect on both sides of the tensioner 122. This optimizes the engagement angle of the chain entering the drive sprocket 1141, making it closer to the theoretical tangential direction, reducing engagement impact, and decreasing sprocket tooth wear and chain fatigue.

[0046] like Figure 2 , Figure 6 as well as Figure 7 As shown, one end of the pressure arm 121, on which the tension wheel 122 is mounted, bends outward toward the outside of the chain, engaging the tension wheel 122 with the outside of the chain. A bushing 1121 is mounted on the sub-frame 112, and a small sprocket 1143 is mounted on the bushing 1121 via a bearing. A fixing rod 1122 is mounted on the sub-frame 112, passing through the bushing 1121. The screw-on end of the pressure arm 121 is fitted onto the fixing rod 1122, so that the rotation of the small sprocket 1143 will not affect the pressure arm 121.

[0047] The bushing 1121 is fixedly mounted on the sub-frame 112, providing support for the small sprocket 1143. The fixing rod 1122 passes through the bushing 1121, but there is no connection between the two to transmit torque or force (the bushing is stationary, and the fixing rod is also stationary). The pressure arm 121 is only fitted on the fixing rod 1122 and swings only under the compression and restriction of the secondary pressure arm 132. This swing of the secondary pressure arm 132 is unrelated to the rotational movement of the small sprocket 1143, and they do not interfere with each other, while saving installation space.

[0048] like Figure 4 , Figure 8 As shown, the auxiliary pressure arm 132 is located outside the pressure arm 121. One end of the auxiliary pressure arm 132 is connected to the hanger 131, and the other end is provided with a rubber pressure seat 133. The auxiliary pressure arm 132 is pressed against the outer surface of the auxiliary pressure arm 132 through the rubber pressure seat 133.

[0049] The rubber pressure seat 133 serves as an elastic damping medium between the auxiliary pressure arm 132 and the pressure arm 121. The tension of the spring is transmitted through the auxiliary pressure arm 132, and finally acts on the pressure arm 121 via the rubber pressure seat 133, providing basic tension. The slight oscillation of the pressure arm 121 caused by chain vibration is transmitted to the auxiliary pressure arm 132 through the rubber pressure seat 133, causing displacement or pressure changes. The rubber pressure seat 133 effectively absorbs and attenuates the high-frequency impacts and vibrations transmitted from the chain, preventing them from being directly and rigidly transmitted to the auxiliary pressure arm 132 and the subsequent piston rod 141 mechanism.

[0050] like Figure 9As shown, a clamping cavity 1211 is provided on the pressure arm 121. The chain is transmitted from the drive sprocket 1141 to the small sprocket 1143 and passes through the clamping cavity 1211. The piston-type oil injector 14 is disposed in the clamping cavity 1211. Integrating the core lubrication component into the structure of the tension arm further improves the compactness of the entire system.

[0051] A boom 1311 is connected to the boom 1311, which extends into the clamping cavity 1211. The outer cylinder wall of the piston-type fuel injector 14 is hinged to the boom 1311. A hinge groove 1321 is provided on the auxiliary pressure arm 132, and one end of the piston rod 141 of the piston-type fuel injector 14 is hinged to the hinge groove 1321.

[0052] like Figure 4 , Figure 8 As shown, the cylinder end of the piston-type fuel injector 14 is hinged to the boom 1311, allowing the fuel injector cylinder a certain degree of freedom to swing around the boom 1311. Similarly, the piston rod end is hinged to the hinge slot 1321 of the auxiliary pressure arm 132, allowing the piston rod 141 a certain degree of freedom to swing around the auxiliary pressure arm. This is a key design feature for solving the motion compatibility of multi-link mechanisms. The piston rod (141) can be smoothly and without jamming driven by the auxiliary pressure arm 132 to perform suction action, avoiding dead points. There are complex relative motions between the swing of the pressure arm 121, the follow-up motion (small angle swing) of the auxiliary pressure arm 132, and the reciprocating linear motion of the piston rod 141. The double-hinged structure (cylinder hinge + piston rod hinge) perfectly adapts to these relative motions, avoiding energy loss or action delay caused by uncoordinated mechanism motion, and ensuring that the chain vibration can be efficiently and reliably converted into the driving force of the piston rod.

[0053] It should be noted that: the piston cylinder of the piston-type fuel injector 14 is connected to a compensation pipe, the other end of which extends from the clamping cavity 1211 to the outside of the pressure arm 121, and a one-way valve is installed on the compensation pipe.

[0054] One end of the compensation pipe is connected to the piston cylinder. The one-way valve only allows fluid (lubricating oil) to flow from the external port of the compensation pipe into the piston cylinder, and shuts it off in the opposite direction. The external port of the compensation pipe is located outside the pressure arm 121 and is usually connected to a main lubricating oil tank or a convenient location for refueling, such as connecting to the oil pump in the driver's cab. The driver can start the oil pump by pressing a button to replenish the lubricating oil in the tank to the oil chamber of the piston-type injector 14 through the compensation pipe. As the "lifeline" of the lubrication system, the piston-type injector 14 consumes the lubricating oil in its internal chamber during operation (piston rod reciprocating). Alternatively, when a negative pressure is generated in the oil chamber of the piston-type injector 14 (such as when the piston rod is pulled outward), the lubricating oil in the external oil tank or oil source opens the one-way valve under the action of the pressure difference and automatically replenishes the chamber of the injector through the compensation pipe. This ensures that the lubrication system never runs out of oil and achieves long-term, continuous automatic lubrication. In this case, the remote compensation mode of the oil circuit system is described in detail in this invention.

[0055] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0056] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A survey vehicle with an easily adjustable power unit, characterized in that, include: The rear axle assembly (11) has a frame (111) and a sub-frame (112) mounted on it. The rear axle drive shaft system is mounted on the frame (111) and connected by a sprocket assembly and a chain drive. The adjustment mechanism (12) includes a pressure arm (121) transferred to the subframe (112) and a tensioning wheel (122) transferred to the pressure arm (121). The auxiliary adjustment mechanism (13) includes a hanger (131) mounted on the auxiliary frame (112) and an auxiliary pressure arm (132) connected to the hanger (131). The piston-type fuel injector (14) is positioned opposite to the compression direction of the auxiliary pressure arm (132). One end of its piston rod (141) is movably connected to the auxiliary pressure arm (132), and one end of its oil outlet (142) is close to the nearest meshing point between the tension wheel (122) and the chain. The auxiliary pressure arm (132) and the hanger (131) are tightened by a tension spring (1312) to press the free end of the auxiliary pressure arm (132) onto the pressure arm (121) to form pressure. The pressure is then transferred from the pressure arm (121) to the chain through the tension wheel (122). The jumping that occurs when the chain is transmitted is sequentially transmitted to the tension wheel (122), the pressure arm (121), the auxiliary pressure arm (132), and the piston rod (141) of the piston-type fuel injector (14).

2. The survey vehicle with an easily adjustable power unit according to claim 1, characterized in that, The sprocket assembly includes a drive sprocket (1141) and a driven sprocket (1142) mounted on the drive shaft system. The chain drive is connected to the drive sprocket (1141) and the driven sprocket (1142). The sprocket assembly also includes a small sprocket (1143) that is rotated on the subframe (112). The small sprocket (1143) also engages with the chain and is located between the transmission of the chain from the tensioner (122) to the drive sprocket (1141).

3. A survey vehicle with an easily adjustable power unit according to claim 2, characterized in that, The pressure arm (121) is equipped with the tension wheel (122) at one end, which bends outward toward the outside of the chain and engages the tension wheel (122) with the outside of the chain. A bushing (1121) is installed on the sub-frame (112). The small sprocket (1143) is mounted on the bushing (1121) through a bearing. A fixing rod (1122) is installed on the sub-frame (112). The fixing rod (1122) passes through the bushing (1121). The screw end of the pressure arm (121) is sleeved on the fixing rod (1122), so that the rotation of the small sprocket (1143) will not affect the pressure arm (121).

4. A survey vehicle with an easily adjustable power unit according to claim 3, characterized in that, The auxiliary pressure arm (132) is located outside the pressure arm (121). One end of the auxiliary pressure arm (132) is connected to the hanger (131), and the other end is provided with a rubber pressure seat (133). The auxiliary pressure arm (132) is pressed against the outer surface of the pressure arm (121) through the rubber pressure seat (133).

5. A survey vehicle with an easily adjustable power unit according to claim 4, characterized in that, The pressure arm (121) has a clamping cavity (1211), and the chain is transmitted from the driving sprocket (1141) to the small sprocket (1143) and passes through the clamping cavity (1211). The piston-type fuel injector (14) is located in the clamping cavity (1211).

6. A survey vehicle with an easily adjustable power unit according to claim 5, characterized in that, The boom (1311) is connected to the hanger (131), the boom (1311) extends into the clamping cavity (1211), the outer cylinder wall of the piston-type fuel injector (14) is hinged to the boom (1311), the auxiliary pressure arm (132) is provided with a hinge groove (1321), and one end of the piston rod (141) of the piston-type fuel injector (14) is hinged to the hinge groove (1321).

7. A survey vehicle with an easily adjustable power unit according to claim 6, characterized in that, The piston cylinder of the piston-type fuel injector (14) is connected to a compensation pipe. The other end of the compensation pipe extends from the clamping cavity (1211) to the outside of the pressure arm (121), and a one-way valve is installed on the pipeline of the compensation pipe.

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